diff --git a/python/sglang/srt/layers/activation.py b/python/sglang/srt/layers/activation.py
index 6cae1fd9a..1ebb44d55 100644
--- a/python/sglang/srt/layers/activation.py
+++ b/python/sglang/srt/layers/activation.py
@@ -31,8 +31,9 @@ from vllm.distributed import (
     get_tensor_model_parallel_world_size,
 )
 from vllm.model_executor.custom_op import CustomOp
-from vllm.model_executor.layers.quantization import QuantizationConfig
-from vllm.model_executor.utils import set_weight_attrs
+
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
+from sglang.srt.utils import set_weight_attrs
 
 logger = logging.getLogger(__name__)
 
diff --git a/python/sglang/srt/layers/linear.py b/python/sglang/srt/layers/linear.py
new file mode 100644
index 000000000..e61dccd6a
--- /dev/null
+++ b/python/sglang/srt/layers/linear.py
@@ -0,0 +1,1133 @@
+# Adapted from https://raw.githubusercontent.com/vllm-project/vllm/v0.5.5/vllm/model_executor/layers/linear.py
+
+import logging
+from abc import abstractmethod
+from typing import Dict, List, Optional, Tuple
+
+import torch
+import torch.nn.functional as F
+from torch.nn.parameter import Parameter, UninitializedParameter
+from vllm.distributed import (
+    divide,
+    get_tensor_model_parallel_rank,
+    get_tensor_model_parallel_world_size,
+    split_tensor_along_last_dim,
+    tensor_model_parallel_all_gather,
+    tensor_model_parallel_all_reduce,
+)
+
+# workaround
+from vllm.model_executor.layers.linear import LinearBase
+from vllm.model_executor.parameter import (
+    BasevLLMParameter,
+    PackedvLLMParameter,
+    PerTensorScaleParameter,
+)
+
+from sglang.srt.layers.quantization.base_config import (
+    QuantizationConfig,
+    QuantizeMethodBase,
+)
+from sglang.srt.utils import set_weight_attrs
+
+logger = logging.getLogger(__name__)
+
+WEIGHT_LOADER_V2_SUPPORTED = [
+    "CompressedTensorsLinearMethod",
+    "AWQMarlinLinearMethod",
+    "AWQLinearMethod",
+    "GPTQMarlinLinearMethod",
+    "Fp8LinearMethod",
+    "MarlinLinearMethod",
+]
+
+
+def adjust_marlin_shard(param, shard_size, shard_offset):
+    marlin_tile_size = getattr(param, "marlin_tile_size", None)
+    if marlin_tile_size is None:
+        return shard_size, shard_offset
+
+    return shard_size * marlin_tile_size, shard_offset * marlin_tile_size
+
+
+def adjust_bitsandbytes_shard(
+    param: Parameter, qkv_offsets: Dict[str, Tuple[int, int]], loaded_shard_id: str
+) -> Tuple[int, int]:
+    """Adjust the quantization offsets and sizes for BitsAndBytes sharding."""
+
+    total, _ = qkv_offsets["total"]
+    orig_offset, orig_size = qkv_offsets[loaded_shard_id]
+
+    quantized_total = param.data.shape[0]
+    quantized_offset = orig_offset * quantized_total // total
+    quantized_size = orig_size * quantized_total // total
+
+    return quantized_size, quantized_offset
+
+
+def adjust_scalar_to_fused_array(param, loaded_weight, shard_id):
+    """For fused modules (QKV and MLP) we have an array of length
+    N that holds 1 scale for each "logical" matrix. So the param
+    is an array of length N. The loaded_weight corresponds to
+    one of the shards on disk. Here, we slice the param based on
+    the shard_id for loading.
+    """
+    qkv_idxs = {"q": 0, "k": 1, "v": 2}
+
+    if isinstance(shard_id, str):
+        shard_id = qkv_idxs[shard_id]
+    elif not isinstance(shard_id, int):
+        raise ValueError(f"Unknown Shard Id {shard_id}")
+
+    # AutoFP8 scales do not have a shape
+    # compressed-tensors scales do have a shape
+    if len(loaded_weight.shape) != 0:
+        assert loaded_weight.shape[0] == 1
+        loaded_weight = loaded_weight[0]
+
+    return param[shard_id], loaded_weight
+
+
+class LinearMethodBase(QuantizeMethodBase):
+    """Base class for different (maybe quantized) linear methods."""
+
+    @abstractmethod
+    def create_weights(
+        self,
+        layer: torch.nn.Module,
+        input_size_per_partition: int,
+        output_partition_sizes: List[int],
+        input_size: int,
+        output_size: int,
+        params_dtype: torch.dtype,
+        **extra_weight_attrs,
+    ):
+        """Create weights for a linear layer.
+           The weights will be set as attributes of the layer.
+
+        Args:
+            layer: The layer that is using the LinearMethodBase factory.
+            input_size_per_partition: Size of the weight input dim on rank X.
+            output_partition_sizes: Sizes of the output dim of each logical
+                weight on rank X. E.g., output_partition_sizes for QKVLinear
+                is a list contains the width of Wq, Wk, Wv on rank X.
+            input_size: Size of the input dim of the weight across all ranks.
+            output_size: Size of the output dim of the weight across all ranks.
+            params_dtype: Datatype of the parameters.
+        """
+        raise NotImplementedError
+
+    @abstractmethod
+    def apply(
+        self,
+        layer: torch.nn.Module,
+        x: torch.Tensor,
+        bias: Optional[torch.Tensor] = None,
+    ) -> torch.Tensor:
+        """Apply the weights in layer to the input tensor.
+        Expects create_weights to have been called before on the layer."""
+        raise NotImplementedError
+
+
+class UnquantizedLinearMethod(LinearMethodBase):
+    """Linear method without quantization."""
+
+    def create_weights(
+        self,
+        layer: torch.nn.Module,
+        input_size_per_partition: int,
+        output_partition_sizes: List[int],
+        input_size: int,
+        output_size: int,
+        params_dtype: torch.dtype,
+        **extra_weight_attrs,
+    ):
+        weight = Parameter(
+            torch.empty(
+                sum(output_partition_sizes),
+                input_size_per_partition,
+                dtype=params_dtype,
+            ),
+            requires_grad=False,
+        )
+        set_weight_attrs(weight, {"input_dim": 1, "output_dim": 0})
+        layer.register_parameter("weight", weight)
+        set_weight_attrs(weight, extra_weight_attrs)
+
+    def apply(
+        self,
+        layer: torch.nn.Module,
+        x: torch.Tensor,
+        bias: Optional[torch.Tensor] = None,
+    ) -> torch.Tensor:
+
+        return F.linear(x, layer.weight, bias)
+
+
+class ReplicatedLinear(LinearBase):
+    """Replicated linear layer.
+
+    Args:
+        input_size: input dimension of the linear layer.
+        output_size: output dimension of the linear layer.
+        bias: If true, add bias.
+        skip_bias_add: If true, skip adding bias but instead return it.
+        params_dtype: Data type for the parameters.
+        quant_config: Quantization configure.
+        prefix: The name of the layer in the state dict, including all parents
+                        (e.g. model.layers.0.qkv_proj)
+    """
+
+    def __init__(
+        self,
+        input_size: int,
+        output_size: int,
+        bias: bool = True,
+        skip_bias_add: bool = False,
+        params_dtype: Optional[torch.dtype] = None,
+        quant_config: Optional[QuantizationConfig] = None,
+        prefix: str = "",
+    ):
+        super().__init__(
+            input_size,
+            output_size,
+            skip_bias_add,
+            params_dtype,
+            quant_config,
+            prefix=prefix,
+        )
+
+        # All the linear layer supports quant method.
+        assert self.quant_method is not None
+        self.quant_method.create_weights(
+            self,
+            self.input_size,
+            [self.output_size],
+            self.input_size,
+            self.output_size,
+            self.params_dtype,
+            weight_loader=self.weight_loader,
+            prefix=prefix,
+        )
+
+        if bias:
+            self.bias = Parameter(
+                torch.empty(self.output_size, dtype=self.params_dtype)
+            )
+            set_weight_attrs(
+                self.bias,
+                {
+                    "output_dim": 0,
+                    "weight_loader": self.weight_loader,
+                },
+            )
+        else:
+            self.register_parameter("bias", None)
+
+    def weight_loader(self, param: Parameter, loaded_weight: torch.Tensor):
+        # If the weight on disk does not have a shape, give it one
+        # (such scales for AutoFp8).
+        if len(loaded_weight.shape) == 0:
+            loaded_weight = loaded_weight.reshape(1)
+
+        assert param.size() == loaded_weight.size()
+        param.data.copy_(loaded_weight)
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        bias = self.bias if not self.skip_bias_add else None
+        assert self.quant_method is not None
+        output = self.quant_method.apply(self, x, bias)
+        output_bias = self.bias if self.skip_bias_add else None
+        return output, output_bias
+
+    def extra_repr(self) -> str:
+        s = f"in_features={self.input_size}"
+        s += f", output_features={self.output_size}"
+        s += f", bias={self.bias is not None}"
+        return s
+
+
+class ColumnParallelLinear(LinearBase):
+    """Linear layer with column parallelism.
+
+    The linear layer is defined as Y = XA + b. A is parallelized along
+    its second dimension as A = [A_1, ..., A_p].
+
+    Args:
+        input_size: first dimension of matrix A.
+        output_size: second dimension of matrix A.
+        bias: If true, add bias.
+        gather_output: If true, call all-gather on output and make Y available
+                       to all GPUs, otherwise, every GPU will have its output
+                       which is Y_i = XA_i
+        skip_bias_add: This was added to enable performance optimizations where
+                       bias can be fused with other element-wise operations. we
+                       skip adding bias but instead return it.
+        params_dtype: Data type for the parameters.
+        quant_config: Quantization configure.
+        output_sizes: list of output sizes packed into one output, like for QKV
+                       the list would be size 3.
+        prefix: The name of the layer in the state dict, including all parents
+                        (e.g. model.layers.0.qkv_proj)
+    """
+
+    def __init__(
+        self,
+        input_size: int,
+        output_size: int,
+        bias: bool = True,
+        gather_output: bool = False,
+        skip_bias_add: bool = False,
+        params_dtype: Optional[torch.dtype] = None,
+        quant_config: Optional[QuantizationConfig] = None,
+        output_sizes: Optional[List[int]] = None,
+        prefix: str = "",
+    ):
+        super().__init__(
+            input_size, output_size, skip_bias_add, params_dtype, quant_config, prefix
+        )
+
+        self.gather_output = gather_output
+
+        # Divide the weight matrix along the last dimension.
+        tp_size = get_tensor_model_parallel_world_size()
+        assert self.quant_method is not None
+        self.output_size_per_partition = divide(self.output_size, tp_size)
+        self.output_partition_sizes = [self.output_size_per_partition]
+        # If QKV or MergedColumn, use output size of each partition.
+        if hasattr(self, "output_sizes"):
+            self.output_partition_sizes = [
+                divide(output_size, tp_size) for output_size in self.output_sizes
+            ]
+
+        if output_sizes is None:
+            output_sizes = [output_size]
+
+        self.quant_method.create_weights(
+            layer=self,
+            input_size_per_partition=self.input_size,
+            output_partition_sizes=self.output_partition_sizes,
+            input_size=self.input_size,
+            output_size=self.output_size,
+            params_dtype=self.params_dtype,
+            weight_loader=(
+                self.weight_loader_v2
+                if self.quant_method.__class__.__name__ in WEIGHT_LOADER_V2_SUPPORTED
+                else self.weight_loader
+            ),
+            prefix=prefix,
+        )
+        if bias:
+            self.bias = Parameter(
+                torch.empty(self.output_size_per_partition, dtype=params_dtype)
+            )
+            set_weight_attrs(
+                self.bias,
+                {
+                    "output_dim": 0,
+                    "weight_loader": self.weight_loader,
+                },
+            )
+        else:
+            self.register_parameter("bias", None)
+
+    def weight_loader(self, param: Parameter, loaded_weight: torch.Tensor):
+        tp_rank = get_tensor_model_parallel_rank()
+        output_dim = getattr(param, "output_dim", None)
+
+        # Special case for GGUF
+        is_gguf_weight = getattr(param, "is_gguf_weight", False)
+        is_gguf_weight_type = getattr(param, "is_gguf_weight_type", False)
+        if is_gguf_weight_type:
+            param.weight_type = loaded_weight.item()
+
+        # Materialize GGUF UninitializedParameter
+        if is_gguf_weight and isinstance(param, UninitializedParameter):
+            param.materialize(loaded_weight.shape, dtype=loaded_weight.dtype)
+
+        param_data = param.data
+        if output_dim is not None:
+            shard_size = param_data.shape[output_dim]
+            start_idx = tp_rank * shard_size
+            loaded_weight = loaded_weight.narrow(output_dim, start_idx, shard_size)
+
+        # Special case for loading scales off disk, which often do not
+        # have a shape (such as in the case of AutoFP8).
+        if len(loaded_weight.shape) == 0:
+            loaded_weight = loaded_weight.reshape(1)
+
+        assert param_data.shape == loaded_weight.shape
+        param_data.copy_(loaded_weight)
+
+    def weight_loader_v2(self, param: Parameter, loaded_weight: torch.Tensor):
+        # Special case for loading scales off disk, which often do not
+        # have a shape (such as in the case of AutoFP8).
+        if len(loaded_weight.shape) == 0:
+            assert loaded_weight.numel() == 1
+            loaded_weight = loaded_weight.reshape(1)
+        param.load_column_parallel_weight(loaded_weight=loaded_weight)
+
+    def forward(self, input_):
+        bias = self.bias if not self.skip_bias_add else None
+
+        # Matrix multiply.
+        assert self.quant_method is not None
+        output_parallel = self.quant_method.apply(self, input_, bias)
+        if self.gather_output:
+            # All-gather across the partitions.
+            output = tensor_model_parallel_all_gather(output_parallel)
+        else:
+            output = output_parallel
+        output_bias = self.bias if self.skip_bias_add else None
+        return output, output_bias
+
+    def extra_repr(self) -> str:
+        s = f"in_features={self.input_size}"
+        s += f", output_features={self.output_size_per_partition}"
+        s += f", bias={self.bias is not None}"
+        s += f", tp_size={get_tensor_model_parallel_world_size()}"
+        s += f", gather_output={self.gather_output}"
+        return s
+
+
+class MergedColumnParallelLinear(ColumnParallelLinear):
+    """Packed linear layers with column parallelism.
+
+    Similar to ColumnParallelLinear, but the weight matrix is concatenated
+    along the output dimension. When the weight matrix is loaded, the
+    different partitions are sharded separately.
+
+    Args:
+        input_size: input dimension of the linear layer.
+        output_sizes: list of output dimensions of the linear layer.
+        bias: If true, add bias.
+        gather_output: If true, call all-gather on output and make the output
+                       available to all GPUs, otherwise, every GPU will have
+                       its own output.
+        skip_bias_add: This was added to enable performance optimizations where
+                       bias can be fused with other element-wise operations. we
+                       skip adding bias but instead return it.
+        params_dtype: Data type for the parameters.
+        quant_config: Quantization configure.
+        prefix: The name of the layer in the state dict, including all parents
+                        (e.g. model.layers.0.qkv_proj)
+    """
+
+    def __init__(
+        self,
+        input_size: int,
+        output_sizes: List[int],
+        bias: bool = True,
+        gather_output: bool = False,
+        skip_bias_add: bool = False,
+        params_dtype: Optional[torch.dtype] = None,
+        quant_config: Optional[QuantizationConfig] = None,
+        prefix: str = "",
+    ):
+        self.output_sizes = output_sizes
+        tp_size = get_tensor_model_parallel_world_size()
+        assert all(output_size % tp_size == 0 for output_size in output_sizes)
+        super().__init__(
+            input_size=input_size,
+            output_size=sum(output_sizes),
+            bias=bias,
+            gather_output=gather_output,
+            skip_bias_add=skip_bias_add,
+            params_dtype=params_dtype,
+            quant_config=quant_config,
+            prefix=prefix,
+        )
+
+    def weight_loader(
+        self,
+        param: Parameter,
+        loaded_weight: torch.Tensor,
+        loaded_shard_id: Optional[int] = None,
+    ):
+
+        # Special case for GGUF
+        # initialize GGUF param after we know the quantize type
+        is_gguf_weight = getattr(param, "is_gguf_weight", False)
+        is_gguf_weight_type = getattr(param, "is_gguf_weight_type", False)
+        if is_gguf_weight_type:
+            param.data[loaded_shard_id].copy_(loaded_weight)
+            param.shard_weight_type[loaded_shard_id] = loaded_weight.item()
+            return
+
+        if is_gguf_weight and isinstance(param, UninitializedParameter):
+            from gguf.constants import GGML_QUANT_SIZES
+
+            ori_shape = param.tensor_shape
+            weight_types = self.qweight_type.shard_weight_type.values()
+            row_size = []
+            for weight_type in weight_types:
+                block_size, type_size = GGML_QUANT_SIZES[weight_type]
+                row_size.append(ori_shape[1] // block_size * type_size)
+            q_shape = (ori_shape[0], max(row_size))
+            param.materialize(q_shape, dtype=loaded_weight.dtype)
+
+        param_data = param.data
+        output_dim = getattr(param, "output_dim", None)
+        # Special case for AQLM codebooks.
+        is_metadata = getattr(param, "is_metadata", False)
+        # Special case for per-tensor scale to load scalar into fused array.
+        needs_scalar_to_array = getattr(param, "needs_scalar_to_array", False)
+
+        if loaded_shard_id is None:
+            # Loaded weight is already fused on disk (qkv/mlp).
+            if output_dim is None:
+                if needs_scalar_to_array:
+                    param_data, loaded_weight = adjust_scalar_to_fused_array(
+                        param_data, loaded_weight, 0
+                    )
+
+                assert param_data.shape == loaded_weight.shape
+                param_data.copy_(loaded_weight)
+                return
+            current_shard_offset = 0
+            shard_offsets: List[Tuple[int, int, int]] = []
+            for i, output_size in enumerate(self.output_sizes):
+                shard_offsets.append((i, current_shard_offset, output_size))
+                current_shard_offset += output_size
+            packed_dim = getattr(param, "packed_dim", None)
+            for shard_id, shard_offset, shard_size in shard_offsets:
+                # Special case for Quantization.
+                # If quantized, we need to adjust the offset and size to account
+                # for the packing.
+                if packed_dim == output_dim:
+                    shard_size = shard_size // param.pack_factor
+                    shard_offset = shard_offset // param.pack_factor
+                    # Special case for Marlin.
+                    shard_size, shard_offset = adjust_marlin_shard(
+                        param, shard_size, shard_offset
+                    )
+
+                loaded_weight_shard = loaded_weight.narrow(
+                    output_dim, shard_offset, shard_size
+                )
+                self.weight_loader(param, loaded_weight_shard, shard_id)
+            return
+
+        assert loaded_shard_id < len(self.output_sizes)
+        tp_rank = get_tensor_model_parallel_rank()
+        tp_size = get_tensor_model_parallel_world_size()
+        if output_dim is not None:
+            shard_offset = sum(self.output_sizes[:loaded_shard_id]) // tp_size
+            shard_size = self.output_sizes[loaded_shard_id] // tp_size
+            # Special case for quantization.
+            # If quantized, we need to adjust the offset and size to account
+            # for the packing.
+            packed_dim = getattr(param, "packed_dim", None)
+            if packed_dim == output_dim:
+                shard_size = shard_size // param.pack_factor
+                shard_offset = shard_offset // param.pack_factor
+                # Special case for Marlin.
+                shard_size, shard_offset = adjust_marlin_shard(
+                    param, shard_size, shard_offset
+                )
+
+            use_bitsandbytes = getattr(param, "use_bitsandbytes", False)
+            if use_bitsandbytes:
+                shard_size = loaded_weight.shape[output_dim]
+                shard_offset = loaded_weight.shape[output_dim] * loaded_shard_id
+
+            if is_gguf_weight:
+                tp_size = get_tensor_model_parallel_world_size()
+                output_dim = getattr(param, "output_dim", None)
+                shard_shape = list(loaded_weight.shape)
+                shard_shape[output_dim] = shard_shape[output_dim] // tp_size
+                param.shard_id.append(loaded_shard_id)
+                param.shard_size[loaded_shard_id] = shard_shape
+
+                input_dim = getattr(param, "input_dim", None)
+                input_size = loaded_weight.shape[input_dim]
+                param_data = param_data.narrow(input_dim, 0, input_size)
+
+            param_data = param_data.narrow(output_dim, shard_offset, shard_size)
+            start_idx = tp_rank * shard_size
+            loaded_weight = loaded_weight.narrow(output_dim, start_idx, shard_size)
+        # Special case for AQLM codebooks.
+        elif is_metadata:
+            # metadata indicates fixed size concatenated along dim 0
+            shard_size = loaded_weight.shape[0]
+            shard_offset = loaded_shard_id * shard_size
+            param_data = param_data.narrow(0, shard_offset, shard_size)
+
+        # Special case for per-tensor scales in fused case.
+        elif needs_scalar_to_array:
+            param_data, loaded_weight = adjust_scalar_to_fused_array(
+                param_data, loaded_weight, loaded_shard_id
+            )
+
+        else:
+            ignore_warning = getattr(param, "ignore_warning", False)
+            if not ignore_warning:
+                logger.warning(
+                    "Loading a weight without `output_dim` attribute in "
+                    "MergedColumnParallelLinear, assume the weight is "
+                    "the same for all partitions."
+                )
+
+        assert param_data.shape == loaded_weight.shape
+        param_data.copy_(loaded_weight)
+
+    def _load_fused_module_from_checkpoint(
+        self, param: BasevLLMParameter, loaded_weight: torch.Tensor
+    ):
+        """
+        Handle special case for models where MLP layers are already
+        fused on disk. In this case, we have no shard id. This function
+        determmines the shard id by splitting these layers and then calls
+        the weight loader using the shard id.
+
+        An example of a model with these fused layers:
+        https://huggingface.co/microsoft/Phi-3-mini-4k-instruct
+        """
+
+        current_shard_offset = 0
+        shard_offsets: List[Tuple[int, int, int]] = []
+        for i, output_size in enumerate(self.output_sizes):
+            shard_offsets.append((i, current_shard_offset, output_size))
+            current_shard_offset += output_size
+
+        for shard_id, shard_offset, shard_size in shard_offsets:
+            # Special case for Quantization.
+            # If quantized, we need to adjust the offset and size to account
+            # for the packing.
+            if (
+                isinstance(param, PackedvLLMParameter)
+                and param.packed_dim == param.output_dim
+            ):
+                shard_size, shard_offset = param.adjust_shard_indexes_for_packing(
+                    shard_size=shard_size, shard_offset=shard_offset
+                )
+
+            loaded_weight_shard = loaded_weight.narrow(
+                param.output_dim, shard_offset, shard_size
+            )
+            self.weight_loader_v2(param, loaded_weight_shard, shard_id)
+
+    def weight_loader_v2(
+        self,
+        param: BasevLLMParameter,
+        loaded_weight: torch.Tensor,
+        loaded_shard_id: Optional[int] = None,
+    ):
+        if loaded_shard_id is None:
+            if isinstance(param, PerTensorScaleParameter):
+                param.load_merged_column_weight(loaded_weight=loaded_weight, shard_id=0)
+                return
+            elif type(param) is BasevLLMParameter:
+                param.load_merged_column_weight(loaded_weight=loaded_weight)
+                return
+            self._load_fused_module_from_checkpoint(param, loaded_weight)
+            return
+
+        assert loaded_shard_id < len(self.output_sizes)
+
+        tp_size = get_tensor_model_parallel_world_size()
+        shard_offset = sum(self.output_sizes[:loaded_shard_id]) // tp_size
+        shard_size = self.output_sizes[loaded_shard_id] // tp_size
+
+        param.load_merged_column_weight(
+            loaded_weight=loaded_weight,
+            shard_id=loaded_shard_id,
+            shard_offset=shard_offset,
+            shard_size=shard_size,
+        )
+
+
+class QKVParallelLinear(ColumnParallelLinear):
+    """Linear layers for the attention's QKV transformation.
+
+    Linear layers for the linear transformation of the query, key, and value
+    vectors in the attention layer. The weight matrix is concatenated along
+    the output dimension. The layer is parallelized along the head dimension.
+    When the number of key/value heads is smaller than the number of query
+    heads (e.g., multi-query/grouped-query attention), the key/value head may
+    be replicated while the query heads are partitioned.
+
+    Args:
+        hidden_size: input hidden state size of the transformer.
+        head_size: size of each attention head.
+        total_num_heads: total number of attention query heads.
+        total_num_kv_heads: total number of attention key/value heads. If
+                            None, assume total_num_kv_heads = total_num_heads.
+        bias: If true, add bias.
+        skip_bias_add: This was added to enable performance optimizations where
+                       bias can be fused with other element-wise operations. we
+                       skip adding bias but instead return it.
+        params_dtype: Data type for the parameters.
+        quant_config: Quantization configure.
+        prefix: The name of the layer in the state dict, including all parents
+                        (e.g. model.layers.0.qkv_proj)
+    """
+
+    def __init__(
+        self,
+        hidden_size: int,
+        head_size: int,
+        total_num_heads: int,
+        total_num_kv_heads: Optional[int] = None,
+        bias: bool = True,
+        skip_bias_add: bool = False,
+        params_dtype: Optional[torch.dtype] = None,
+        quant_config: Optional[QuantizationConfig] = None,
+        prefix: str = "",
+    ):
+        self.hidden_size = hidden_size
+        self.head_size = head_size
+        self.total_num_heads = total_num_heads
+        if total_num_kv_heads is None:
+            total_num_kv_heads = total_num_heads
+        self.total_num_kv_heads = total_num_kv_heads
+        # Divide the weight matrix along the last dimension.
+        tp_size = get_tensor_model_parallel_world_size()
+        self.num_heads = divide(self.total_num_heads, tp_size)
+        if tp_size >= self.total_num_kv_heads:
+            self.num_kv_heads = 1
+            self.num_kv_head_replicas = divide(tp_size, self.total_num_kv_heads)
+        else:
+            self.num_kv_heads = divide(self.total_num_kv_heads, tp_size)
+            self.num_kv_head_replicas = 1
+        input_size = self.hidden_size
+        output_size = (
+            (self.num_heads + 2 * self.num_kv_heads) * tp_size * self.head_size
+        )
+        self.output_sizes = [
+            self.num_heads * self.head_size * tp_size,  # q_proj
+            self.num_kv_heads * self.head_size * tp_size,  # k_proj
+            self.num_kv_heads * self.head_size * tp_size,  # v_proj
+        ]
+
+        super().__init__(
+            input_size=input_size,
+            output_size=output_size,
+            bias=bias,
+            gather_output=False,
+            skip_bias_add=skip_bias_add,
+            params_dtype=params_dtype,
+            quant_config=quant_config,
+            prefix=prefix,
+        )
+
+    def _get_shard_offset_mapping(self, loaded_shard_id: str):
+        shard_offset_mapping = {
+            "q": 0,
+            "k": self.num_heads * self.head_size,
+            "v": (self.num_heads + self.num_kv_heads) * self.head_size,
+            "total": (self.num_heads + 2 * self.num_kv_heads) * self.head_size,
+        }
+        return shard_offset_mapping.get(loaded_shard_id)
+
+    def _get_shard_size_mapping(self, loaded_shard_id: str):
+        shard_size_mapping = {
+            "q": self.num_heads * self.head_size,
+            "k": self.num_kv_heads * self.head_size,
+            "v": self.num_kv_heads * self.head_size,
+        }
+        return shard_size_mapping.get(loaded_shard_id)
+
+    def _load_fused_module_from_checkpoint(
+        self, param: BasevLLMParameter, loaded_weight: torch.Tensor
+    ):
+        """
+        Handle special case for models where QKV layers are already
+        fused on disk. In this case, we have no shard id. This function
+        determmines the shard id by splitting these layers and then calls
+        the weight loader using the shard id.
+
+        An example of a model with these fused layers:
+        https://huggingface.co/microsoft/Phi-3-mini-4k-instruct
+        """
+        shard_offsets = [
+            # (shard_id, shard_offset, shard_size)
+            ("q", 0, self.total_num_heads * self.head_size),
+            (
+                "k",
+                self.total_num_heads * self.head_size,
+                self.total_num_kv_heads * self.head_size,
+            ),
+            (
+                "v",
+                (self.total_num_heads + self.total_num_kv_heads) * self.head_size,
+                self.total_num_kv_heads * self.head_size,
+            ),
+        ]
+
+        for shard_id, shard_offset, shard_size in shard_offsets:
+            # Special case for Quantization.
+            # If quantized, we need to adjust the offset and size to account
+            # for the packing.
+            if (
+                isinstance(param, PackedvLLMParameter)
+                and param.packed_dim == param.output_dim
+            ):
+                shard_size, shard_offset = param.adjust_shard_indexes_for_packing(
+                    shard_size=shard_size, shard_offset=shard_offset
+                )
+
+            loaded_weight_shard = loaded_weight.narrow(
+                param.output_dim, shard_offset, shard_size
+            )
+            self.weight_loader_v2(param, loaded_weight_shard, shard_id)
+
+    def weight_loader_v2(
+        self,
+        param: BasevLLMParameter,
+        loaded_weight: torch.Tensor,
+        loaded_shard_id: Optional[str] = None,
+    ):
+        if loaded_shard_id is None:  # special case for certain models
+            if isinstance(param, PerTensorScaleParameter):
+                param.load_merged_column_weight(loaded_weight=loaded_weight, shard_id=0)
+                return
+            elif type(param) is BasevLLMParameter:
+                param.load_merged_column_weight(loaded_weight=loaded_weight)
+                return
+            self._load_fused_module_from_checkpoint(param, loaded_weight)
+            return
+
+        assert loaded_shard_id in ["q", "k", "v"]
+
+        shard_offset = self._get_shard_offset_mapping(loaded_shard_id)
+        shard_size = self._get_shard_size_mapping(loaded_shard_id)
+
+        param.load_qkv_weight(
+            loaded_weight=loaded_weight,
+            num_heads=self.num_kv_head_replicas,
+            shard_id=loaded_shard_id,
+            shard_offset=shard_offset,
+            shard_size=shard_size,
+        )
+
+    def weight_loader(
+        self,
+        param: Parameter,
+        loaded_weight: torch.Tensor,
+        loaded_shard_id: Optional[str] = None,
+    ):
+
+        # Special case for GGUF
+        # initialize GGUF param after we know the quantize type
+        is_gguf_weight = getattr(param, "is_gguf_weight", False)
+        is_gguf_weight_type = getattr(param, "is_gguf_weight_type", False)
+        if is_gguf_weight_type and loaded_shard_id is not None:
+            idx_map = {"q": 0, "k": 1, "v": 2}
+            param.data[idx_map[loaded_shard_id]].copy_(loaded_weight)
+            param.shard_weight_type[loaded_shard_id] = loaded_weight.item()
+            return
+
+        if is_gguf_weight and isinstance(param, UninitializedParameter):
+            from gguf.constants import GGML_QUANT_SIZES
+
+            ori_shape = param.tensor_shape
+            weight_types = self.qweight_type.shard_weight_type.values()
+            row_size = []
+            for weight_type in weight_types:
+                block_size, type_size = GGML_QUANT_SIZES[weight_type]
+                row_size.append(ori_shape[1] // block_size * type_size)
+            q_shape = (ori_shape[0], max(row_size))
+            param.materialize(q_shape, dtype=loaded_weight.dtype)
+
+        param_data = param.data
+        output_dim = getattr(param, "output_dim", None)
+        # Special case for AQLM codebooks.
+        is_metadata = getattr(param, "is_metadata", False)
+
+        # Special case for per-tensor scales in fused case.
+        needs_scalar_to_array = getattr(param, "needs_scalar_to_array", False)
+
+        if loaded_shard_id is None:
+            # Loaded weight is already fused on disk (qkv/mlp).
+            if output_dim is None:
+                if needs_scalar_to_array:
+                    param_data, loaded_weight = adjust_scalar_to_fused_array(
+                        param_data, loaded_weight, 0
+                    )
+
+                assert param_data.shape == loaded_weight.shape
+                param_data.copy_(loaded_weight)
+                return
+            shard_offsets = [
+                # (shard_id, shard_offset, shard_size)
+                ("q", 0, self.total_num_heads * self.head_size),
+                (
+                    "k",
+                    self.total_num_heads * self.head_size,
+                    self.total_num_kv_heads * self.head_size,
+                ),
+                (
+                    "v",
+                    (self.total_num_heads + self.total_num_kv_heads) * self.head_size,
+                    self.total_num_kv_heads * self.head_size,
+                ),
+            ]
+            packed_dim = getattr(param, "packed_dim", None)
+            for shard_id, shard_offset, shard_size in shard_offsets:
+                # Special case for Quantized Weights.
+                # If quantized, we need to adjust the offset and size to account
+                # for the packing.
+                if packed_dim == output_dim:
+                    shard_size = shard_size // param.pack_factor
+                    shard_offset = shard_offset // param.pack_factor
+
+                    # Special case for Marlin.
+                    shard_size, shard_offset = adjust_marlin_shard(
+                        param, shard_size, shard_offset
+                    )
+
+                loaded_weight_shard = loaded_weight.narrow(
+                    output_dim, shard_offset, shard_size
+                )
+                self.weight_loader(param, loaded_weight_shard, shard_id)
+            return
+
+        tp_rank = get_tensor_model_parallel_rank()
+        assert loaded_shard_id in ["q", "k", "v"]
+
+        # If output dim is defined, use the default loading process.
+        if output_dim is not None:
+            if loaded_shard_id == "q":
+                shard_offset = 0
+                shard_size = self.num_heads * self.head_size
+            elif loaded_shard_id == "k":
+                shard_offset = self.num_heads * self.head_size
+                shard_size = self.num_kv_heads * self.head_size
+            elif loaded_shard_id == "v":
+                shard_offset = (self.num_heads + self.num_kv_heads) * self.head_size
+                shard_size = self.num_kv_heads * self.head_size
+            # Special case for Quantized Weights.
+            # If quantized, we need to adjust the offset and size to account
+            # for the packing.
+            packed_dim = getattr(param, "packed_dim", None)
+            if packed_dim == output_dim:
+                shard_size = shard_size // param.pack_factor
+                shard_offset = shard_offset // param.pack_factor
+
+                # Special case for Marlin.
+                shard_size, shard_offset = adjust_marlin_shard(
+                    param, shard_size, shard_offset
+                )
+
+            use_bitsandbytes = getattr(param, "use_bitsandbytes", False)
+            if use_bitsandbytes:
+                orig_qkv_offsets = {
+                    "q": (0, self.num_heads * self.head_size),
+                    "k": (
+                        self.num_heads * self.head_size,
+                        self.num_kv_heads * self.head_size,
+                    ),
+                    "v": (
+                        (self.num_heads + self.num_kv_heads) * self.head_size,
+                        self.num_kv_heads * self.head_size,
+                    ),
+                    "total": (
+                        (self.num_heads + 2 * self.num_kv_heads) * self.head_size,
+                        0,
+                    ),
+                }
+                shard_size, shard_offset = adjust_bitsandbytes_shard(
+                    param, orig_qkv_offsets, loaded_shard_id
+                )
+
+            if is_gguf_weight:
+                tp_size = get_tensor_model_parallel_world_size()
+                output_dim = getattr(param, "output_dim", None)
+                shard_shape = list(loaded_weight.shape)
+                shard_shape[output_dim] = shard_shape[output_dim] // tp_size
+                param.shard_id.append(loaded_shard_id)
+                param.shard_size[loaded_shard_id] = shard_shape
+
+                input_dim = getattr(param, "input_dim", None)
+                input_size = loaded_weight.shape[input_dim]
+                param_data = param_data.narrow(input_dim, 0, input_size)
+
+            param_data = param_data.narrow(output_dim, shard_offset, shard_size)
+            if loaded_shard_id == "q":
+                shard_id = tp_rank
+            else:
+                shard_id = tp_rank // self.num_kv_head_replicas
+            start_idx = shard_id * shard_size
+            loaded_weight = loaded_weight.narrow(output_dim, start_idx, shard_size)
+        # Special case for for AQLM codebooks.
+        elif is_metadata:
+            # metadata indicates fixed size concatenated along dim 0
+            shard_size = loaded_weight.shape[0]
+            shard_index = ["q", "k", "v"].index(loaded_shard_id)
+            param_data = param_data.narrow(0, shard_index * shard_size, shard_size)
+        # Special case for per-tensor scales in fused case.
+        elif needs_scalar_to_array:
+            param_data, loaded_weight = adjust_scalar_to_fused_array(
+                param_data, loaded_weight, loaded_shard_id
+            )
+        else:
+            ignore_warning = getattr(param, "ignore_warning", False)
+            if not ignore_warning:
+                logger.warning(
+                    "Loading a weight without `output_dim` attribute in "
+                    "QKVParallelLinear, assume the weight is the same "
+                    "for all partitions."
+                )
+
+        assert param_data.shape == loaded_weight.shape
+        param_data.copy_(loaded_weight)
+
+
+class RowParallelLinear(LinearBase):
+    """Linear layer with row parallelism.
+
+    The linear layer is defined as Y = XA + b. A is parallelized along
+    its first dimension and X along its second dimension as:
+               -   -
+              | A_1 |
+              | .   |
+          A = | .   |        X = [X_1, ..., X_p]
+              | .   |
+              | A_p |
+               -   -
+    Arguments:
+        input_size: first dimension of matrix A.
+        output_size: second dimension of matrix A.
+        bias: If true, add bias. Note that bias is not parallelized.
+        input_is_parallel: If true, we assume that the input is already
+                           split across the GPUs and we do not split
+                           again.
+        skip_bias_add: This was added to enable performance optimization where
+                       bias can be fused with other element-wise operations.
+                       We skip adding bias but instead return it.
+        params_dtype: Data type for the parameters.
+        quant_config: Quantization configure.
+    """
+
+    def __init__(
+        self,
+        input_size: int,
+        output_size: int,
+        bias: bool = True,
+        input_is_parallel: bool = True,
+        skip_bias_add: bool = False,
+        params_dtype: Optional[torch.dtype] = None,
+        reduce_results: bool = True,
+        quant_config: Optional[QuantizationConfig] = None,
+        prefix: str = "",
+    ):
+        super().__init__(
+            input_size, output_size, skip_bias_add, params_dtype, quant_config, prefix
+        )
+
+        self.input_is_parallel = input_is_parallel
+        self.reduce_results = reduce_results
+
+        # Divide the weight matrix along the last dimension.
+        self.tp_rank = get_tensor_model_parallel_rank()
+        self.tp_size = get_tensor_model_parallel_world_size()
+        self.input_size_per_partition = divide(input_size, self.tp_size)
+        assert self.quant_method is not None
+
+        self.quant_method.create_weights(
+            layer=self,
+            input_size_per_partition=self.input_size_per_partition,
+            output_partition_sizes=[self.output_size],
+            input_size=self.input_size,
+            output_size=self.output_size,
+            params_dtype=self.params_dtype,
+            weight_loader=(
+                self.weight_loader_v2
+                if self.quant_method.__class__.__name__ in WEIGHT_LOADER_V2_SUPPORTED
+                else self.weight_loader
+            ),
+            prefix=prefix,
+        )
+        if not reduce_results and (bias and not skip_bias_add):
+            raise ValueError(
+                "When not reduce the results, adding bias to the "
+                "results can lead to incorrect results"
+            )
+
+        if bias:
+            self.bias = Parameter(torch.empty(self.output_size, dtype=params_dtype))
+            set_weight_attrs(
+                self.bias,
+                {
+                    "output_dim": 0,
+                    "weight_loader": self.weight_loader,
+                },
+            )
+        else:
+            self.register_parameter("bias", None)
+
+    def weight_loader(self, param: Parameter, loaded_weight: torch.Tensor):
+        tp_rank = get_tensor_model_parallel_rank()
+        tp_size = get_tensor_model_parallel_world_size()
+        input_dim = getattr(param, "input_dim", None)
+
+        # Special case for GGUF
+        is_gguf_weight = getattr(param, "is_gguf_weight", False)
+        is_gguf_weight_type = getattr(param, "is_gguf_weight_type", False)
+        if is_gguf_weight_type:
+            param.weight_type = loaded_weight.item()
+
+        # Materialize GGUF UninitializedParameter
+        if is_gguf_weight and isinstance(param, UninitializedParameter):
+            weight_shape = list(loaded_weight.shape)
+            if input_dim:
+                weight_shape[input_dim] = weight_shape[input_dim] // tp_size
+            param.materialize(tuple(weight_shape), dtype=loaded_weight.dtype)
+
+        param_data = param.data
+        if input_dim is not None:
+            shard_size = param_data.shape[input_dim]
+            start_idx = tp_rank * shard_size
+            loaded_weight = loaded_weight.narrow(input_dim, start_idx, shard_size)
+
+        # Special case for loading scales off disk, which often do not
+        # have a shape (such as in the case of AutoFP8).
+        if len(loaded_weight.shape) == 0:
+            loaded_weight = loaded_weight.reshape(1)
+
+        assert param_data.shape == loaded_weight.shape
+        param_data.copy_(loaded_weight)
+
+    def weight_loader_v2(self, param: BasevLLMParameter, loaded_weight: torch.Tensor):
+
+        # Special case for loading scales off disk, which often do not
+        # have a shape (such as in the case of AutoFP8).
+        if len(loaded_weight.shape) == 0:
+            assert loaded_weight.numel() == 1
+            loaded_weight = loaded_weight.reshape(1)
+
+        param.load_row_parallel_weight(loaded_weight=loaded_weight)
+
+    def forward(self, input_):
+        if self.input_is_parallel:
+            input_parallel = input_
+        else:
+            tp_rank = get_tensor_model_parallel_rank()
+            splitted_input = split_tensor_along_last_dim(
+                input_, num_partitions=self.tp_size
+            )
+            input_parallel = splitted_input[tp_rank].contiguous()
+
+        # Matrix multiply.
+        assert self.quant_method is not None
+        # Only fuse bias add into GEMM for rank 0 (this ensures that
+        # bias will not get added more than once in TP>1 case)
+        bias_ = None if (self.tp_rank > 0 or self.skip_bias_add) else self.bias
+        output_parallel = self.quant_method.apply(self, input_parallel, bias=bias_)
+        if self.reduce_results and self.tp_size > 1:
+            output = tensor_model_parallel_all_reduce(output_parallel)
+        else:
+            output = output_parallel
+
+        output_bias = self.bias if self.skip_bias_add else None
+
+        return output, output_bias
+
+    def extra_repr(self) -> str:
+        s = f"input_features={self.input_size_per_partition}"
+        s += f", output_features={self.output_size}"
+        s += f", bias={self.bias is not None}"
+        s += f", tp_size={self.tp_size}"
+        s += f", reduce_results={self.reduce_results}"
+        return s
diff --git a/python/sglang/srt/layers/quantization/__init__.py b/python/sglang/srt/layers/quantization/__init__.py
new file mode 100644
index 000000000..5f9619de1
--- /dev/null
+++ b/python/sglang/srt/layers/quantization/__init__.py
@@ -0,0 +1,76 @@
+# Adapted from https://raw.githubusercontent.com/vllm-project/vllm/v0.5.5/vllm/model_executor/layers/quantization/__init__.py
+
+from typing import Dict, Type
+
+from vllm.model_executor.layers.quantization.aqlm import AQLMConfig
+from vllm.model_executor.layers.quantization.awq import AWQConfig
+from vllm.model_executor.layers.quantization.awq_marlin import AWQMarlinConfig
+from vllm.model_executor.layers.quantization.bitsandbytes import BitsAndBytesConfig
+from vllm.model_executor.layers.quantization.compressed_tensors.compressed_tensors import (  # noqa: E501
+    CompressedTensorsConfig,
+)
+from vllm.model_executor.layers.quantization.deepspeedfp import DeepSpeedFPConfig
+from vllm.model_executor.layers.quantization.experts_int8 import ExpertsInt8Config
+from vllm.model_executor.layers.quantization.fbgemm_fp8 import FBGEMMFp8Config
+from vllm.model_executor.layers.quantization.fp8 import Fp8Config
+from vllm.model_executor.layers.quantization.gguf import GGUFConfig
+from vllm.model_executor.layers.quantization.gptq import GPTQConfig
+from vllm.model_executor.layers.quantization.gptq_marlin import GPTQMarlinConfig
+from vllm.model_executor.layers.quantization.gptq_marlin_24 import GPTQMarlin24Config
+from vllm.model_executor.layers.quantization.marlin import MarlinConfig
+from vllm.model_executor.layers.quantization.qqq import QQQConfig
+from vllm.model_executor.layers.quantization.squeezellm import SqueezeLLMConfig
+from vllm.model_executor.layers.quantization.tpu_int8 import Int8TpuConfig
+
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
+
+QUANTIZATION_METHODS: Dict[str, Type[QuantizationConfig]] = {
+    "aqlm": AQLMConfig,
+    "awq": AWQConfig,
+    "deepspeedfp": DeepSpeedFPConfig,
+    "tpu_int8": Int8TpuConfig,
+    "fp8": Fp8Config,
+    "fbgemm_fp8": FBGEMMFp8Config,
+    # The order of gptq methods is important for config.py iteration over
+    # override_quantization_method(..)
+    "marlin": MarlinConfig,
+    "gguf": GGUFConfig,
+    "gptq_marlin_24": GPTQMarlin24Config,
+    "gptq_marlin": GPTQMarlinConfig,
+    "awq_marlin": AWQMarlinConfig,
+    "gptq": GPTQConfig,
+    "squeezellm": SqueezeLLMConfig,
+    "compressed-tensors": CompressedTensorsConfig,
+    "bitsandbytes": BitsAndBytesConfig,
+    "qqq": QQQConfig,
+    "experts_int8": ExpertsInt8Config,
+}
+
+
+def get_quantization_config(quantization: str) -> Type[QuantizationConfig]:
+    if quantization not in QUANTIZATION_METHODS:
+        raise ValueError(f"Invalid quantization method: {quantization}")
+    return QUANTIZATION_METHODS[quantization]
+
+
+__all__ = [
+    "QuantizationConfig",
+    "get_quantization_config",
+    "QUANTIZATION_METHODS",
+]
+
+"""
+def fp8_get_quant_method(
+    self, layer: torch.nn.Module, prefix: str
+) -> Optional["QuantizeMethodBase"]:
+    if isinstance(layer, LinearBase):
+        if is_layer_skipped(prefix, self.ignored_layers):
+            return UnquantizedLinearMethod()
+        return Fp8LinearMethod(self)
+    elif isinstance(layer, FusedMoE):
+        return Fp8MoEMethod(self)
+    return None
+
+
+setattr(Fp8Config, "get_quant_method", fp8_get_quant_method)
+"""
diff --git a/python/sglang/srt/layers/quantization/base_config.py b/python/sglang/srt/layers/quantization/base_config.py
new file mode 100644
index 000000000..aa83b4eea
--- /dev/null
+++ b/python/sglang/srt/layers/quantization/base_config.py
@@ -0,0 +1,122 @@
+# Adapted from https://raw.githubusercontent.com/vllm-project/vllm/v0.5.5/vllm/model_executor/layers/quantization/base_config.py
+
+from abc import ABC, abstractmethod
+from typing import Any, Dict, List, Optional
+
+import torch
+from torch import nn
+
+
+class QuantizeMethodBase(ABC):
+    """Base class for different quantized methods."""
+
+    @abstractmethod
+    def create_weights(
+        self, layer: torch.nn.Module, *weight_args, **extra_weight_attrs
+    ):
+        """Create weights for a layer.
+
+        The weights will be set as attributes of the layer."""
+        raise NotImplementedError
+
+    @abstractmethod
+    def apply(self, layer: torch.nn.Module, *args, **kwargs) -> torch.Tensor:
+        """Apply the weights in layer to the input tensor.
+
+        Expects create_weights to have been called before on the layer."""
+        raise NotImplementedError
+
+    def process_weights_after_loading(self, layer: nn.Module) -> None:
+        """Process the weight after loading.
+
+        This can be used for example, to transpose weights for computation.
+        """
+        return
+
+
+class QuantizationConfig(ABC):
+    """Base class for quantization configs."""
+
+    @abstractmethod
+    def get_name(self) -> str:
+        """Name of the quantization method."""
+        raise NotImplementedError
+
+    @abstractmethod
+    def get_supported_act_dtypes(self) -> List[torch.dtype]:
+        """List of supported activation dtypes."""
+        raise NotImplementedError
+
+    @classmethod
+    @abstractmethod
+    def get_min_capability(cls) -> int:
+        """Minimum GPU capability to support the quantization method.
+
+        E.g., 70 for Volta, 75 for Turing, 80 for Ampere.
+        This requirement is due to the custom CUDA kernels used by the
+        quantization method.
+        """
+        raise NotImplementedError
+
+    @staticmethod
+    @abstractmethod
+    def get_config_filenames() -> List[str]:
+        """List of filenames to search for in the model directory."""
+        raise NotImplementedError
+
+    @classmethod
+    @abstractmethod
+    def from_config(cls, config: Dict[str, Any]) -> "QuantizationConfig":
+        """Create a config class from the model's quantization config."""
+        raise NotImplementedError
+
+    @classmethod
+    def override_quantization_method(cls, hf_quant_cfg, user_quant) -> Optional[str]:
+        """
+        Detects if this quantization method can support a given checkpoint
+        format by overriding the user specified quantization method --
+        this method should only be overwritten by subclasses in exceptional
+        circumstances
+        """
+        return None
+
+    @staticmethod
+    def get_from_keys(config: Dict[str, Any], keys: List[str]) -> Any:
+        """Get a value from the model's quantization config."""
+        for key in keys:
+            if key in config:
+                return config[key]
+        raise ValueError(
+            f"Cannot find any of {keys} in the model's " "quantization config."
+        )
+
+    @staticmethod
+    def get_from_keys_or(config: Dict[str, Any], keys: List[str], default: Any) -> Any:
+        """Get a optional value from the model's quantization config."""
+        try:
+            return QuantizationConfig.get_from_keys(config, keys)
+        except ValueError:
+            return default
+
+    @abstractmethod
+    def get_quant_method(
+        self, layer: torch.nn.Module, prefix: str
+    ) -> Optional[QuantizeMethodBase]:
+        """Get the quantize method to use for the quantized layer.
+
+        Args:
+            layer: The layer for the quant method.
+            prefix: The full name of the layer in the state dict
+        Returns:
+            The quantize method. None if the given layer doesn't support quant
+            method.
+        """
+        raise NotImplementedError
+
+    @abstractmethod
+    def get_scaled_act_names(self) -> List[str]:
+        """Returns the activation function names that should be post-scaled.
+
+        For now, this is only used by AWQ.
+        """
+        raise NotImplementedError
diff --git a/python/sglang/srt/models/baichuan.py b/python/sglang/srt/models/baichuan.py
index 19d2a3384..f42627ad6 100644
--- a/python/sglang/srt/models/baichuan.py
+++ b/python/sglang/srt/models/baichuan.py
@@ -34,7 +34,6 @@ from vllm.model_executor.layers.linear import (
     QKVParallelLinear,
     RowParallelLinear,
 )
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -45,6 +44,7 @@ from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 from sglang.srt.layers.activation import SiluAndMul
 from sglang.srt.layers.layernorm import RMSNorm
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 
diff --git a/python/sglang/srt/models/chatglm.py b/python/sglang/srt/models/chatglm.py
index 783dbb4c5..7e8dd2adc 100644
--- a/python/sglang/srt/models/chatglm.py
+++ b/python/sglang/srt/models/chatglm.py
@@ -24,12 +24,6 @@ from torch import nn
 from torch.nn import LayerNorm
 from vllm.config import CacheConfig
 from vllm.distributed import get_tensor_model_parallel_world_size
-from vllm.model_executor.layers.linear import (
-    MergedColumnParallelLinear,
-    QKVParallelLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -40,7 +34,13 @@ from vllm.transformers_utils.configs import ChatGLMConfig
 
 from sglang.srt.layers.activation import SiluAndMul
 from sglang.srt.layers.layernorm import RMSNorm
+from sglang.srt.layers.linear import (
+    MergedColumnParallelLinear,
+    QKVParallelLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 
diff --git a/python/sglang/srt/models/commandr.py b/python/sglang/srt/models/commandr.py
index f6d6f6e1f..9c93d1e41 100644
--- a/python/sglang/srt/models/commandr.py
+++ b/python/sglang/srt/models/commandr.py
@@ -50,21 +50,21 @@ from vllm.distributed import (
     get_tensor_model_parallel_rank,
     get_tensor_model_parallel_world_size,
 )
-from vllm.model_executor.layers.linear import (
+from vllm.model_executor.layers.rotary_embedding import get_rope
+from vllm.model_executor.layers.vocab_parallel_embedding import VocabParallelEmbedding
+from vllm.model_executor.model_loader.weight_utils import default_weight_loader
+
+from sglang.srt.layers.activation import SiluAndMul
+from sglang.srt.layers.linear import (
     MergedColumnParallelLinear,
     QKVParallelLinear,
     RowParallelLinear,
 )
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
-from vllm.model_executor.layers.rotary_embedding import get_rope
-from vllm.model_executor.layers.vocab_parallel_embedding import VocabParallelEmbedding
-from vllm.model_executor.model_loader.weight_utils import default_weight_loader
-from vllm.model_executor.utils import set_weight_attrs
-
-from sglang.srt.layers.activation import SiluAndMul
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
+from sglang.srt.utils import set_weight_attrs
 
 
 @torch.compile
diff --git a/python/sglang/srt/models/dbrx.py b/python/sglang/srt/models/dbrx.py
index 39ac4aefa..9fd0f335d 100644
--- a/python/sglang/srt/models/dbrx.py
+++ b/python/sglang/srt/models/dbrx.py
@@ -27,12 +27,6 @@ from vllm.distributed import (
     tensor_model_parallel_all_reduce,
 )
 from vllm.model_executor.layers.fused_moe import fused_moe
-from vllm.model_executor.layers.linear import (
-    QKVParallelLinear,
-    ReplicatedLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     DEFAULT_VOCAB_PADDING_SIZE,
@@ -40,12 +34,18 @@ from vllm.model_executor.layers.vocab_parallel_embedding import (
     VocabParallelEmbedding,
 )
 from vllm.model_executor.model_loader.weight_utils import default_weight_loader
-from vllm.model_executor.utils import set_weight_attrs
 from vllm.transformers_utils.configs.dbrx import DbrxConfig
 
+from sglang.srt.layers.linear import (
+    QKVParallelLinear,
+    ReplicatedLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
+from sglang.srt.utils import set_weight_attrs
 
 
 class DbrxRouter(nn.Module):
diff --git a/python/sglang/srt/models/deepseek.py b/python/sglang/srt/models/deepseek.py
index 59fd1ec7e..590f8f0bf 100644
--- a/python/sglang/srt/models/deepseek.py
+++ b/python/sglang/srt/models/deepseek.py
@@ -28,13 +28,6 @@ from vllm.distributed import (
     tensor_model_parallel_all_reduce,
 )
 from vllm.model_executor.layers.fused_moe import fused_moe
-from vllm.model_executor.layers.linear import (
-    MergedColumnParallelLinear,
-    QKVParallelLinear,
-    ReplicatedLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -44,7 +37,14 @@ from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.activation import SiluAndMul
 from sglang.srt.layers.layernorm import RMSNorm
+from sglang.srt.layers.linear import (
+    MergedColumnParallelLinear,
+    QKVParallelLinear,
+    ReplicatedLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 
diff --git a/python/sglang/srt/models/deepseek_v2.py b/python/sglang/srt/models/deepseek_v2.py
index 22b434a85..2d46f3e8a 100644
--- a/python/sglang/srt/models/deepseek_v2.py
+++ b/python/sglang/srt/models/deepseek_v2.py
@@ -27,13 +27,6 @@ from vllm.distributed import (
     tensor_model_parallel_all_reduce,
 )
 from vllm.model_executor.layers.fused_moe import FusedMoE
-from vllm.model_executor.layers.linear import (
-    ColumnParallelLinear,
-    MergedColumnParallelLinear,
-    ReplicatedLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -43,7 +36,14 @@ from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.activation import SiluAndMul
 from sglang.srt.layers.layernorm import RMSNorm
+from sglang.srt.layers.linear import (
+    ColumnParallelLinear,
+    MergedColumnParallelLinear,
+    ReplicatedLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.managers.schedule_batch import global_server_args_dict
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
diff --git a/python/sglang/srt/models/exaone.py b/python/sglang/srt/models/exaone.py
index 63d40be7a..4af7a9f47 100644
--- a/python/sglang/srt/models/exaone.py
+++ b/python/sglang/srt/models/exaone.py
@@ -23,12 +23,6 @@ import torch
 from torch import nn
 from vllm.config import CacheConfig
 from vllm.distributed import get_tensor_model_parallel_world_size
-from vllm.model_executor.layers.linear import (
-    MergedColumnParallelLinear,
-    QKVParallelLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -38,7 +32,13 @@ from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.activation import SiluAndMul
 from sglang.srt.layers.layernorm import RMSNorm
+from sglang.srt.layers.linear import (
+    MergedColumnParallelLinear,
+    QKVParallelLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor, LogitsProcessorOutput
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 
diff --git a/python/sglang/srt/models/gemma.py b/python/sglang/srt/models/gemma.py
index ae3b1b194..50cbca1a1 100644
--- a/python/sglang/srt/models/gemma.py
+++ b/python/sglang/srt/models/gemma.py
@@ -23,19 +23,19 @@ from torch import nn
 from transformers import PretrainedConfig
 from vllm.config import CacheConfig, LoRAConfig
 from vllm.distributed import get_tensor_model_parallel_world_size
-from vllm.model_executor.layers.linear import (
-    MergedColumnParallelLinear,
-    QKVParallelLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import VocabParallelEmbedding
 from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.activation import GeluAndMul
 from sglang.srt.layers.layernorm import RMSNorm
+from sglang.srt.layers.linear import (
+    MergedColumnParallelLinear,
+    QKVParallelLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 
diff --git a/python/sglang/srt/models/gemma2.py b/python/sglang/srt/models/gemma2.py
index 3223424d7..b6a282bd8 100644
--- a/python/sglang/srt/models/gemma2.py
+++ b/python/sglang/srt/models/gemma2.py
@@ -22,12 +22,6 @@ from torch import nn
 from transformers import PretrainedConfig
 from vllm.config import CacheConfig, LoRAConfig
 from vllm.distributed import get_tensor_model_parallel_world_size
-from vllm.model_executor.layers.linear import (
-    MergedColumnParallelLinear,
-    QKVParallelLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 
 # from vllm.model_executor.layers.rotary_embedding import GemmaRotaryEmbedding
 from vllm.model_executor.layers.vocab_parallel_embedding import VocabParallelEmbedding
@@ -35,7 +29,13 @@ from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.activation import GeluAndMul
 from sglang.srt.layers.layernorm import GemmaRMSNorm
+from sglang.srt.layers.linear import (
+    MergedColumnParallelLinear,
+    QKVParallelLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 
diff --git a/python/sglang/srt/models/gpt_bigcode.py b/python/sglang/srt/models/gpt_bigcode.py
index 94b7f6153..f063c732f 100644
--- a/python/sglang/srt/models/gpt_bigcode.py
+++ b/python/sglang/srt/models/gpt_bigcode.py
@@ -23,17 +23,17 @@ from torch import nn
 from transformers import GPTBigCodeConfig
 from vllm.config import CacheConfig, LoRAConfig
 from vllm.distributed import get_tensor_model_parallel_world_size
-from vllm.model_executor.layers.linear import (
-    ColumnParallelLinear,
-    QKVParallelLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.vocab_parallel_embedding import VocabParallelEmbedding
 from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.activation import get_act_fn
+from sglang.srt.layers.linear import (
+    ColumnParallelLinear,
+    QKVParallelLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 
diff --git a/python/sglang/srt/models/grok.py b/python/sglang/srt/models/grok.py
index daf6f25da..2eda52983 100644
--- a/python/sglang/srt/models/grok.py
+++ b/python/sglang/srt/models/grok.py
@@ -28,12 +28,6 @@ from vllm.distributed import (
     get_tensor_model_parallel_rank,
     get_tensor_model_parallel_world_size,
 )
-from vllm.model_executor.layers.linear import (
-    QKVParallelLinear,
-    ReplicatedLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -44,7 +38,13 @@ from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.fused_moe import FusedMoE
 from sglang.srt.layers.layernorm import RMSNorm
+from sglang.srt.layers.linear import (
+    QKVParallelLinear,
+    ReplicatedLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 
diff --git a/python/sglang/srt/models/internlm2.py b/python/sglang/srt/models/internlm2.py
index f2947e991..9eb73f1fc 100644
--- a/python/sglang/srt/models/internlm2.py
+++ b/python/sglang/srt/models/internlm2.py
@@ -23,12 +23,6 @@ from torch import nn
 from transformers import PretrainedConfig
 from vllm.config import CacheConfig
 from vllm.distributed import get_tensor_model_parallel_world_size
-from vllm.model_executor.layers.linear import (
-    MergedColumnParallelLinear,
-    QKVParallelLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -38,7 +32,13 @@ from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.activation import SiluAndMul
 from sglang.srt.layers.layernorm import RMSNorm
+from sglang.srt.layers.linear import (
+    MergedColumnParallelLinear,
+    QKVParallelLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 
diff --git a/python/sglang/srt/models/llama.py b/python/sglang/srt/models/llama.py
index a01619b3a..447b548aa 100644
--- a/python/sglang/srt/models/llama.py
+++ b/python/sglang/srt/models/llama.py
@@ -24,12 +24,6 @@ from torch import nn
 from transformers import LlamaConfig
 from vllm.config import CacheConfig
 from vllm.distributed import get_tensor_model_parallel_world_size
-from vllm.model_executor.layers.linear import (
-    MergedColumnParallelLinear,
-    QKVParallelLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -39,7 +33,13 @@ from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.activation import SiluAndMul
 from sglang.srt.layers.layernorm import RMSNorm
+from sglang.srt.layers.linear import (
+    MergedColumnParallelLinear,
+    QKVParallelLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor, LogitsProcessorOutput
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.layers.torchao_utils import apply_torchao_config_
 from sglang.srt.managers.schedule_batch import global_server_args_dict
diff --git a/python/sglang/srt/models/llama_classification.py b/python/sglang/srt/models/llama_classification.py
index c17651064..536bec2f1 100644
--- a/python/sglang/srt/models/llama_classification.py
+++ b/python/sglang/srt/models/llama_classification.py
@@ -19,10 +19,10 @@ import torch
 from torch import nn
 from transformers import LlamaConfig
 from vllm.config import CacheConfig
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.logits_processor import LogitsProcessorOutput
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 from sglang.srt.models.llama import LlamaForCausalLM, LlamaModel
 
diff --git a/python/sglang/srt/models/llava.py b/python/sglang/srt/models/llava.py
index 9c1e529f0..df62b39fc 100644
--- a/python/sglang/srt/models/llava.py
+++ b/python/sglang/srt/models/llava.py
@@ -32,9 +32,9 @@ from transformers import (
 )
 from transformers.models.llava.modeling_llava import LlavaMultiModalProjector
 from vllm.config import CacheConfig
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.mm_utils import (
     get_anyres_image_grid_shape,
     unpad_image,
diff --git a/python/sglang/srt/models/llavavid.py b/python/sglang/srt/models/llavavid.py
index 45f47cffc..408a90f19 100644
--- a/python/sglang/srt/models/llavavid.py
+++ b/python/sglang/srt/models/llavavid.py
@@ -23,9 +23,9 @@ from torch import nn
 from transformers import CLIPVisionModel, LlavaConfig
 from transformers.models.llava.modeling_llava import LlavaMultiModalProjector
 from vllm.config import CacheConfig
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.model_executor.forward_batch_info import ForwardMode, InputMetadata
 from sglang.srt.models.llama import LlamaForCausalLM
 
diff --git a/python/sglang/srt/models/minicpm.py b/python/sglang/srt/models/minicpm.py
index 49ff1926f..f796e881f 100644
--- a/python/sglang/srt/models/minicpm.py
+++ b/python/sglang/srt/models/minicpm.py
@@ -22,12 +22,6 @@ import torch
 from torch import nn
 from vllm.config import CacheConfig
 from vllm.distributed import get_tensor_model_parallel_world_size
-from vllm.model_executor.layers.linear import (
-    MergedColumnParallelLinear,
-    QKVParallelLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -37,7 +31,13 @@ from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.activation import SiluAndMul
 from sglang.srt.layers.layernorm import RMSNorm
+from sglang.srt.layers.linear import (
+    MergedColumnParallelLinear,
+    QKVParallelLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 
diff --git a/python/sglang/srt/models/minicpm3.py b/python/sglang/srt/models/minicpm3.py
index a025d074e..3bc094e5a 100644
--- a/python/sglang/srt/models/minicpm3.py
+++ b/python/sglang/srt/models/minicpm3.py
@@ -29,7 +29,6 @@ from vllm.model_executor.layers.linear import (
     ReplicatedLinear,
     RowParallelLinear,
 )
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -40,6 +39,7 @@ from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 from sglang.srt.layers.activation import SiluAndMul
 from sglang.srt.layers.layernorm import RMSNorm
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.managers.schedule_batch import global_server_args_dict
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
diff --git a/python/sglang/srt/models/mixtral.py b/python/sglang/srt/models/mixtral.py
index d7c232ec1..73a7b8686 100644
--- a/python/sglang/srt/models/mixtral.py
+++ b/python/sglang/srt/models/mixtral.py
@@ -24,12 +24,6 @@ from transformers import MixtralConfig
 from vllm.config import CacheConfig
 from vllm.distributed import get_tensor_model_parallel_world_size
 from vllm.model_executor.layers.fused_moe import FusedMoE
-from vllm.model_executor.layers.linear import (
-    QKVParallelLinear,
-    ReplicatedLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     DEFAULT_VOCAB_PADDING_SIZE,
@@ -39,7 +33,13 @@ from vllm.model_executor.layers.vocab_parallel_embedding import (
 from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.layernorm import RMSNorm
+from sglang.srt.layers.linear import (
+    QKVParallelLinear,
+    ReplicatedLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.layers.torchao_utils import apply_torchao_config_
 from sglang.srt.managers.schedule_batch import global_server_args_dict
diff --git a/python/sglang/srt/models/mixtral_quant.py b/python/sglang/srt/models/mixtral_quant.py
index b02e925c5..2e7483771 100644
--- a/python/sglang/srt/models/mixtral_quant.py
+++ b/python/sglang/srt/models/mixtral_quant.py
@@ -29,12 +29,6 @@ from vllm.distributed import (
     get_tensor_model_parallel_world_size,
     tensor_model_parallel_all_reduce,
 )
-from vllm.model_executor.layers.linear import (
-    QKVParallelLinear,
-    ReplicatedLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -43,7 +37,13 @@ from vllm.model_executor.layers.vocab_parallel_embedding import (
 from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.layernorm import RMSNorm
+from sglang.srt.layers.linear import (
+    QKVParallelLinear,
+    ReplicatedLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 
diff --git a/python/sglang/srt/models/olmoe.py b/python/sglang/srt/models/olmoe.py
index 6ada0e9f9..28eda6f4f 100644
--- a/python/sglang/srt/models/olmoe.py
+++ b/python/sglang/srt/models/olmoe.py
@@ -35,7 +35,6 @@ from vllm.model_executor.layers.linear import (
     ReplicatedLinear,
     RowParallelLinear,
 )
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -47,6 +46,7 @@ from vllm.utils import print_warning_once
 from sglang.srt.layers.activation import SiluAndMul
 from sglang.srt.layers.layernorm import RMSNorm
 from sglang.srt.layers.logits_processor import LogitsProcessor, LogitsProcessorOutput
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 
diff --git a/python/sglang/srt/models/qwen.py b/python/sglang/srt/models/qwen.py
index 8787d0d58..3a2d31001 100644
--- a/python/sglang/srt/models/qwen.py
+++ b/python/sglang/srt/models/qwen.py
@@ -22,12 +22,6 @@ from torch import nn
 from transformers import PretrainedConfig
 from vllm.config import CacheConfig
 from vllm.distributed import get_tensor_model_parallel_world_size
-from vllm.model_executor.layers.linear import (
-    MergedColumnParallelLinear,
-    QKVParallelLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -37,7 +31,13 @@ from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.activation import SiluAndMul
 from sglang.srt.layers.layernorm import RMSNorm
+from sglang.srt.layers.linear import (
+    MergedColumnParallelLinear,
+    QKVParallelLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 
diff --git a/python/sglang/srt/models/qwen2.py b/python/sglang/srt/models/qwen2.py
index 4e7d8e57b..5aac3f79c 100644
--- a/python/sglang/srt/models/qwen2.py
+++ b/python/sglang/srt/models/qwen2.py
@@ -22,12 +22,6 @@ import torch
 from torch import nn
 from vllm.config import CacheConfig
 from vllm.distributed import get_tensor_model_parallel_world_size
-from vllm.model_executor.layers.linear import (
-    MergedColumnParallelLinear,
-    QKVParallelLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -37,8 +31,14 @@ from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.activation import SiluAndMul
 from sglang.srt.layers.layernorm import RMSNorm
+from sglang.srt.layers.linear import (
+    MergedColumnParallelLinear,
+    QKVParallelLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor
 from sglang.srt.layers.pooler import Pooler, PoolingType
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 
diff --git a/python/sglang/srt/models/qwen2_moe.py b/python/sglang/srt/models/qwen2_moe.py
index d47589ddc..27fcf6321 100644
--- a/python/sglang/srt/models/qwen2_moe.py
+++ b/python/sglang/srt/models/qwen2_moe.py
@@ -29,13 +29,6 @@ from vllm.distributed import (
     tensor_model_parallel_all_reduce,
 )
 from vllm.model_executor.layers.fused_moe import FusedMoE
-from vllm.model_executor.layers.linear import (
-    MergedColumnParallelLinear,
-    QKVParallelLinear,
-    ReplicatedLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -45,7 +38,14 @@ from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.activation import SiluAndMul
 from sglang.srt.layers.layernorm import RMSNorm
+from sglang.srt.layers.linear import (
+    MergedColumnParallelLinear,
+    QKVParallelLinear,
+    ReplicatedLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.layers.torchao_utils import apply_torchao_config_
 from sglang.srt.managers.schedule_batch import global_server_args_dict
diff --git a/python/sglang/srt/models/stablelm.py b/python/sglang/srt/models/stablelm.py
index 9e10f12f2..2e344ca50 100644
--- a/python/sglang/srt/models/stablelm.py
+++ b/python/sglang/srt/models/stablelm.py
@@ -24,12 +24,6 @@ from torch import nn
 from transformers import PretrainedConfig
 from vllm.config import CacheConfig
 from vllm.distributed import get_tensor_model_parallel_world_size
-from vllm.model_executor.layers.linear import (
-    MergedColumnParallelLinear,
-    QKVParallelLinear,
-    RowParallelLinear,
-)
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -38,7 +32,13 @@ from vllm.model_executor.layers.vocab_parallel_embedding import (
 from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.activation import SiluAndMul
+from sglang.srt.layers.linear import (
+    MergedColumnParallelLinear,
+    QKVParallelLinear,
+    RowParallelLinear,
+)
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 
diff --git a/python/sglang/srt/models/xverse.py b/python/sglang/srt/models/xverse.py
index 388bd66f7..88d3ea2c7 100644
--- a/python/sglang/srt/models/xverse.py
+++ b/python/sglang/srt/models/xverse.py
@@ -31,7 +31,6 @@ from vllm.model_executor.layers.linear import (
     QKVParallelLinear,
     RowParallelLinear,
 )
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -40,6 +39,7 @@ from vllm.model_executor.layers.vocab_parallel_embedding import (
 from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.model_runner import InputMetadata
 
diff --git a/python/sglang/srt/models/xverse_moe.py b/python/sglang/srt/models/xverse_moe.py
index 2f53682d1..666bf1d3d 100644
--- a/python/sglang/srt/models/xverse_moe.py
+++ b/python/sglang/srt/models/xverse_moe.py
@@ -34,7 +34,6 @@ from vllm.model_executor.layers.linear import (
     ReplicatedLinear,
     RowParallelLinear,
 )
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead,
@@ -43,6 +42,7 @@ from vllm.model_executor.layers.vocab_parallel_embedding import (
 from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
 from sglang.srt.layers.logits_processor import LogitsProcessor
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.model_executor.forward_batch_info import InputMetadata
 
diff --git a/python/sglang/srt/models/yivl.py b/python/sglang/srt/models/yivl.py
index 0f86206d8..52f930edc 100644
--- a/python/sglang/srt/models/yivl.py
+++ b/python/sglang/srt/models/yivl.py
@@ -21,9 +21,9 @@ import torch
 import torch.nn as nn
 from transformers import CLIPVisionModel, LlavaConfig
 from vllm.config import CacheConfig
-from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
 from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 
+from sglang.srt.layers.quantization.base_config import QuantizationConfig
 from sglang.srt.models.llava import LlavaLlamaForCausalLM
 
 
diff --git a/python/sglang/srt/utils.py b/python/sglang/srt/utils.py
index 92e670479..c2d2b5f11 100644
--- a/python/sglang/srt/utils.py
+++ b/python/sglang/srt/utils.py
@@ -26,7 +26,7 @@ import struct
 import time
 from importlib.metadata import PackageNotFoundError, version
 from io import BytesIO
-from typing import List, Optional, Union
+from typing import Any, Dict, List, Optional, Union
 
 import numpy as np
 import psutil
@@ -682,3 +682,23 @@ def replace_submodule(
     target_name = module_name.split(".")[-1]
     setattr(parent, target_name, new_module)
     return new_module
+
+
+def set_weight_attrs(
+    weight: torch.Tensor,
+    weight_attrs: Optional[Dict[str, Any]],
+):
+    """Set attributes on a weight tensor.
+
+    This method is used to set attributes on a weight tensor. This method
+    will not overwrite existing attributes.
+
+    Args:
+        weight: The weight tensor.
+        weight_attrs: A dictionary of attributes to set on the weight tensor.
+    """
+    if weight_attrs is None:
+        return
+    for key, value in weight_attrs.items():
+        assert not hasattr(weight, key), f"Overwriting existing tensor attribute: {key}"
+        setattr(weight, key, value)