move apply_torchao_config_ to model_runner (#2342)

python/sglang/srt/layers/torchao_utils.py

@@ -7,13 +7,15 @@ from typing import Dict, Set
 import torch
 
 
-def torchao_quantize_param_data(param: torch.Tensor, torchao_config: str):
-    """Quantize a Tensor with torchao quantization specified by torchao_config
+def apply_torchao_config_to_model_(
+    model: torch.nn.Module, torchao_config: str, filter_fn=None
+):
+    """Quantize a modelwith torchao quantization specified by torchao_config
 
     Args:
-       `param`: weight parameter of the linear module
-       `torchao_config`: type of quantization and their arguments we want to use to
-        quantize the Tensor, e.g. int4wo-128 means int4 weight only quantization with group_size
+       `model`: a model to be quantized based on torchao_config
+       `torchao_config` (str): type of quantization and their arguments we want to use to
+        quantize the model, e.g. int4wo-128 means int4 weight only quantization with group_size
         128
     """
     # Lazy import to suppress some warnings
@@ -26,12 +28,12 @@ def torchao_quantize_param_data(param: torch.Tensor, torchao_config: str):
     )
     from torchao.quantization.observer import PerRow, PerTensor
 
-    dummy_linear = torch.nn.Linear(param.shape[1], param.shape[0], bias=False)
-    dummy_linear.weight = param
-    if "int8wo" in torchao_config:
-        quantize_(dummy_linear, int8_weight_only())
+    if torchao_config == "" or torchao_config is None:
+        return model
+    elif "int8wo" in torchao_config:
+        quantize_(model, int8_weight_only(), filter_fn=filter_fn)
     elif "int8dq" in torchao_config:
-        quantize_(dummy_linear, int8_dynamic_activation_int8_weight())
+        quantize_(model, int8_dynamic_activation_int8_weight(), filter_fn=filter_fn)
     elif "int4wo" in torchao_config:
         group_size = int(torchao_config.split("-")[-1])
         assert group_size in [
@@ -40,13 +42,13 @@ def torchao_quantize_param_data(param: torch.Tensor, torchao_config: str):
             128,
             256,
         ], f"int4wo groupsize needs to be one of [32, 64, 128, 256] but got {group_size}"
-        quantize_(dummy_linear, int4_weight_only(group_size=group_size))
+        quantize_(model, int4_weight_only(group_size=group_size), filter_fn=filter_fn)
     elif "fp8wo" in torchao_config:
         from torchao.quantization import float8_weight_only
 
         # this requires newer hardware
         # [rank0]: AssertionError: fp8e4nv data type is not supported on CUDA arch < 89
-        quantize_(dummy_linear, float8_weight_only())
+        quantize_(model, float8_weight_only(), filter_fn=filter_fn)
     elif "fp8dq" in torchao_config:
         granularity = torchao_config.split("-")[-1]
         GRANULARITY_MAP = {
@@ -57,39 +59,13 @@ def torchao_quantize_param_data(param: torch.Tensor, torchao_config: str):
             granularity in GRANULARITY_MAP
         ), f"Supported granularity are: {GRANULARITY_MAP.keys()}, got {granularity}"
         quantize_(
-            dummy_linear,
+            model,
             float8_dynamic_activation_float8_weight(
                 granularity=GRANULARITY_MAP[granularity]
             ),
+            filter_fn=filter_fn,
         )
     else:
         raise ValueError(f"Unexpected config: {torchao_config}")
 
-    return dummy_linear.weight
-
-
-def apply_torchao_config_(
-    self: torch.nn.Module,
-    params_dict: Dict[str, torch.Tensor],
-    param_suffixes: Set[str],
-) -> None:
-    """A util function used for quantizing the weight parameters after they are loaded if
-       self.torchao_config is specified
-
-    Args:
-      `self`: the model we want to quantize
-      `params_dict`: dictionary mapping from param_name to the parameter Tensor
-      `param_suffixes`: a set of suffixes, we'll quantize the Tensor matching these suffixes
-
-    Returns:
-       None, the `params_dict` is modified inplace and the weights of `self` model are quantized
-    """
-    if self.torchao_config:
-        for param_suffix in param_suffixes:
-            for name in params_dict:
-                param = params_dict[name]
-                if param_suffix in name and param.ndim == 2:
-                    params_dict[name] = torchao_quantize_param_data(
-                        param, self.torchao_config
-                    )
-        self.load_state_dict(params_dict, assign=True)
+    return model

python/sglang/srt/model_executor/model_runner.py

@@ -38,6 +38,7 @@ from sglang.srt.layers.attention.torch_native_backend import TorchNativeAttnBack
 from sglang.srt.layers.attention.triton_backend import TritonAttnBackend
 from sglang.srt.layers.logits_processor import LogitsProcessorOutput
 from sglang.srt.layers.sampler import Sampler
+from sglang.srt.layers.torchao_utils import apply_torchao_config_to_model_
 from sglang.srt.lora.lora_manager import LoRAManager
 from sglang.srt.managers.schedule_batch import global_server_args_dict
 from sglang.srt.mem_cache.memory_pool import (
@@ -159,6 +160,13 @@ class ModelRunner:
         else:
             self.torch_tp_applied = False
 
+        def filter_fn(module, fqn):
+            return "proj" in fqn
+
+        apply_torchao_config_to_model_(
+            self.model, global_server_args_dict["torchao_config"], filter_fn
+        )
+
         # Init memory pool and attention backends
         if server_args.lora_paths is not None:
             self.init_lora_manager()

python/sglang/srt/models/grok.py

@@ -35,12 +35,10 @@ from sglang.srt.layers.linear import (
 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.layers.vocab_parallel_embedding import (
     ParallelLMHead,
     VocabParallelEmbedding,
 )
-from sglang.srt.managers.schedule_batch import global_server_args_dict
 from sglang.srt.model_executor.forward_batch_info import ForwardBatch
 from sglang.srt.model_loader.loader import DefaultModelLoader
 from sglang.srt.model_loader.weight_utils import default_weight_loader
@@ -290,7 +288,6 @@ class Grok1ForCausalLM(nn.Module):
         super().__init__()
         self.config = config
         self.quant_config = quant_config
-        self.torchao_config = global_server_args_dict["torchao_config"]
         self.model = Grok1Model(config, quant_config=quant_config)
         self.lm_head = ParallelLMHead(config.vocab_size, config.hidden_size)
         self.logits_processor = LogitsProcessor(config)
@@ -374,8 +371,6 @@ class Grok1ForCausalLM(nn.Module):
                     )
                     weight_loader(param, loaded_weight)
 
-        apply_torchao_config_(self, params_dict, set(["proj.weight"]))
-
 
 class Grok1ModelForCausalLM(Grok1ForCausalLM):
     """An alias for backward-compatbility."""

python/sglang/srt/models/llama.py

@@ -36,12 +36,10 @@ from sglang.srt.layers.logits_processor import LogitsProcessor, LogitsProcessorO
 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.layers.torchao_utils import apply_torchao_config_
 from sglang.srt.layers.vocab_parallel_embedding import (
     ParallelLMHead,
     VocabParallelEmbedding,
 )
-from sglang.srt.managers.schedule_batch import global_server_args_dict
 from sglang.srt.model_executor.forward_batch_info import ForwardBatch
 from sglang.srt.model_loader.weight_utils import default_weight_loader
 from sglang.srt.utils import make_layers
@@ -304,7 +302,6 @@ class LlamaForCausalLM(nn.Module):
         super().__init__()
         self.config = config
         self.quant_config = quant_config
-        self.torchao_config = global_server_args_dict["torchao_config"]
         self.model = LlamaModel(config, quant_config=quant_config)
         # Llama 3.2 1B Insturct set tie_word_embeddings to True
         # Llama 3.1 8B Insturct set tie_word_embeddings to False
@@ -424,8 +421,6 @@ class LlamaForCausalLM(nn.Module):
                 weight_loader = getattr(param, "weight_loader", default_weight_loader)
                 weight_loader(param, loaded_weight)
 
-        apply_torchao_config_(self, params_dict, set(["proj.weight"]))
-
     def get_weights_by_name(
         self, name: str, truncate_size: int = 100, tp_size: int = 1
     ) -> Optional[torch.Tensor]:

python/sglang/srt/models/mixtral.py

@@ -34,12 +34,10 @@ from sglang.srt.layers.linear import (
 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.layers.vocab_parallel_embedding import (
     ParallelLMHead,
     VocabParallelEmbedding,
 )
-from sglang.srt.managers.schedule_batch import global_server_args_dict
 from sglang.srt.model_executor.forward_batch_info import ForwardBatch
 from sglang.srt.model_loader.weight_utils import default_weight_loader
 
@@ -295,7 +293,6 @@ class MixtralForCausalLM(nn.Module):
         super().__init__()
         self.config = config
         self.quant_config = quant_config
-        self.torchao_config = global_server_args_dict["torchao_config"]
         self.model = MixtralModel(config, quant_config=quant_config, prefix="model")
         self.lm_head = ParallelLMHead(config.vocab_size, config.hidden_size)
         self.logits_processor = LogitsProcessor(config)
@@ -387,7 +384,5 @@ class MixtralForCausalLM(nn.Module):
                     )
                     weight_loader(param, loaded_weight)
 
-        apply_torchao_config_(self, params_dict, set(["proj.weight"]))
-
 
 EntryClass = MixtralForCausalLM

python/sglang/srt/models/phi3_small.py

@@ -17,13 +17,11 @@ from sglang.srt.layers.logits_processor import LogitsProcessor, LogitsProcessorO
 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.layers.torchao_utils import apply_torchao_config_
 from sglang.srt.layers.vocab_parallel_embedding import (
     DEFAULT_VOCAB_PADDING_SIZE,
     ParallelLMHead,
     VocabParallelEmbedding,
 )
-from sglang.srt.managers.schedule_batch import global_server_args_dict
 from sglang.srt.model_executor.forward_batch_info import ForwardBatch
 from sglang.srt.model_loader.weight_utils import default_weight_loader
 from sglang.srt.utils import make_layers
@@ -348,7 +346,6 @@ class Phi3SmallForCausalLM(nn.Module):
             quant_config=quant_config,
             prefix="model",
         )
-        self.torchao_config = global_server_args_dict["torchao_config"]
         self.vocab_size = config.vocab_size
         self.mup_width_multiplier = config.mup_width_multiplier
         self.lm_head = ParallelLMHead(
@@ -441,7 +438,5 @@ class Phi3SmallForCausalLM(nn.Module):
             weight_loader = getattr(param, "weight_loader", default_weight_loader)
             weight_loader(param, loaded_weight)
 
-        apply_torchao_config_(self, params_dict, set(["proj.weight"]))
-
 
 EntryClass = Phi3SmallForCausalLM

python/sglang/srt/models/qwen2_moe.py

@@ -40,12 +40,10 @@ from sglang.srt.layers.linear import (
 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.layers.vocab_parallel_embedding import (
     ParallelLMHead,
     VocabParallelEmbedding,
 )
-from sglang.srt.managers.schedule_batch import global_server_args_dict
 from sglang.srt.model_executor.forward_batch_info import ForwardBatch
 from sglang.srt.model_loader.weight_utils import default_weight_loader
 
@@ -352,7 +350,6 @@ class Qwen2MoeForCausalLM(nn.Module):
         super().__init__()
         self.config = config
         self.quant_config = quant_config
-        self.torchao_config = global_server_args_dict["torchao_config"]
         self.model = Qwen2MoeModel(config, quant_config)
         self.lm_head = ParallelLMHead(
             config.vocab_size, config.hidden_size, quant_config=quant_config
@@ -445,7 +442,5 @@ class Qwen2MoeForCausalLM(nn.Module):
                     )
                     weight_loader(param, loaded_weight)
 
-        apply_torchao_config_(self, params_dict, set(["proj.weight"]))
-
 
 EntryClass = Qwen2MoeForCausalLM

python/sglang/srt/models/torch_native_llama.py

@@ -58,12 +58,10 @@ 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.layers.torchao_utils import apply_torchao_config_
 from sglang.srt.layers.vocab_parallel_embedding import (
     ParallelLMHead,
     VocabParallelEmbedding,
 )
-from sglang.srt.managers.schedule_batch import global_server_args_dict
 from sglang.srt.model_executor.forward_batch_info import ForwardBatch
 from sglang.srt.model_loader.weight_utils import default_weight_loader
 
@@ -392,7 +390,6 @@ class TorchNativeLlamaForCausalLM(nn.Module):
         super().__init__()
         self.config = config
         self.quant_config = quant_config
-        self.torchao_config = global_server_args_dict["torchao_config"]
         self.supports_torch_tp = True
         self.model = LlamaModel(config, quant_config=quant_config)
         if self.config.tie_word_embeddings:
@@ -503,8 +500,6 @@ class TorchNativeLlamaForCausalLM(nn.Module):
                 weight_loader = getattr(param, "weight_loader", default_weight_loader)
                 weight_loader(param, loaded_weight)
 
-        apply_torchao_config_(self, params_dict, set(["proj.weight"]))
-
 
 class TorchNativePhi3ForCausalLM(TorchNativeLlamaForCausalLM):
     pass