[model] DBRX-instruct support (#337)
This commit is contained in:
Liangsheng Yin
416
python/sglang/srt/models/dbrx.py
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416
python/sglang/srt/models/dbrx.py
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# Adapted from:
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# https://github.com/vllm-project/vllm/blob/14ccd94c89d0ffd9da283545d93ab1dfea5da340/vllm/model_executor/models/dbrx.py
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# coding=utf-8
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from typing import Optional
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import torch
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import torch.nn as nn
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from sglang.srt.layers.logits_processor import LogitsProcessor
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from sglang.srt.layers.radix_attention import RadixAttention
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from sglang.srt.managers.router.model_runner import InputMetadata
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from sglang.srt.models.dbrx_config import DbrxConfig
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from vllm.model_executor.layers.fused_moe import fused_moe
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from vllm.model_executor.layers.linear import (
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LinearMethodBase,
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QKVParallelLinear,
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ReplicatedLinear,
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RowParallelLinear,
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)
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from vllm.model_executor.layers.rotary_embedding import get_rope
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from vllm.model_executor.layers.vocab_parallel_embedding import (
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DEFAULT_VOCAB_PADDING_SIZE,
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ParallelLMHead,
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VocabParallelEmbedding,
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)
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from vllm.model_executor.parallel_utils.communication_op import (
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tensor_model_parallel_all_reduce,
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)
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from vllm.model_executor.parallel_utils.parallel_state import (
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get_tensor_model_parallel_rank,
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get_tensor_model_parallel_world_size,
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)
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from vllm.model_executor.utils import set_weight_attrs
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from vllm.model_executor.weight_utils import (
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default_weight_loader,
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hf_model_weights_iterator,
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)
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class DbrxRouter(nn.Module):
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"""A Router implementation for DBRX that returns logits for each expert
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per token.
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"""
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def __init__(
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self,
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config: DbrxConfig,
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params_dtype: Optional[torch.dtype] = None,
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):
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super().__init__()
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self.tp_size = get_tensor_model_parallel_world_size()
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self.num_total_experts = config.ffn_config.moe_num_experts
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self.d_model = config.d_model
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self.layer = ReplicatedLinear(
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self.d_model,
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self.num_total_experts,
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bias=False,
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params_dtype=params_dtype,
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linear_method=None,
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)
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def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
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router_logits, _ = self.layer(hidden_states)
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return router_logits
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class DbrxExperts(nn.Module):
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"""A tensor-parallel MoE implementation for DBRX.
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Each expert's weights are sharded across all ranks and a fused MoE
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kernel is used for the forward pass, and finally we reduce the outputs
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across ranks.
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"""
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def __init__(
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self,
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config: DbrxConfig,
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linear_method: Optional[LinearMethodBase] = None,
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params_dtype: Optional[torch.dtype] = None,
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):
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super().__init__()
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self.tp_size = get_tensor_model_parallel_world_size()
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self.num_total_experts = config.ffn_config.moe_num_experts
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self.top_k = config.ffn_config.moe_top_k
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self.d_model = config.d_model
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self.intermediate_size = config.ffn_config.ffn_hidden_size // self.tp_size
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if params_dtype is None:
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params_dtype = torch.get_default_dtype()
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self.params_dtype = params_dtype
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self.router = DbrxRouter(config, self.params_dtype)
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self.ws = nn.Parameter(
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torch.empty(
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self.num_total_experts,
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2 * self.intermediate_size,
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self.d_model,
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device="cuda",
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dtype=self.params_dtype,
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)
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)
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self.w2s = nn.Parameter(
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torch.empty(
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self.num_total_experts,
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self.d_model,
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self.intermediate_size,
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device="cuda",
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dtype=self.params_dtype,
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)
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)
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set_weight_attrs(
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self.ws,
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{
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"weight_loader": self.weight_loader,
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},
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)
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set_weight_attrs(
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self.w2s,
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{
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"weight_loader": self.weight_loader,
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},
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)
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def weight_loader(
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self, param: nn.Parameter, loaded_weight: torch.Tensor, weight_name: str
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):
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tp_rank = get_tensor_model_parallel_rank()
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param_data = param.data
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shard_size = self.intermediate_size
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shard = slice(tp_rank * shard_size, (tp_rank + 1) * shard_size)
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# DBRX uses GLU for each experts.
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# GLU has 3 linear layers: w1, v1 and w2.
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if weight_name.endswith("w1"):
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loaded_weight = torch.reshape(
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loaded_weight,
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[-1, self.intermediate_size * self.tp_size, self.d_model],
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)
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param_data[:, 0:shard_size, :] = loaded_weight[:, shard, :]
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if weight_name.endswith("v1"):
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loaded_weight = torch.reshape(
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loaded_weight,
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[-1, self.intermediate_size * self.tp_size, self.d_model],
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)
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param_data[:, shard_size : 2 * shard_size, :] = loaded_weight[:, shard, :]
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if weight_name.endswith("w2"):
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loaded_weight = torch.reshape(
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loaded_weight,
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[-1, self.intermediate_size * self.tp_size, self.d_model],
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).transpose(1, 2)
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param_data[:] = loaded_weight[:, :, shard]
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def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
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num_tokens, hidden_size = hidden_states.shape
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hidden_states = hidden_states.view(-1, self.d_model)
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# router_logits: (num_tokens, n_experts)
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router_logits = self.router(hidden_states)
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final_hidden_states = fused_moe(
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hidden_states,
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self.ws,
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self.w2s,
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router_logits,
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self.top_k,
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renormalize=True,
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inplace=True,
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)
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if self.tp_size > 1:
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final_hidden_states = tensor_model_parallel_all_reduce(final_hidden_states)
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return final_hidden_states.view(num_tokens, hidden_size)
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class DbrxAttention(nn.Module):
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def __init__(
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self,
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config: DbrxConfig,
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layer_id: int = 0,
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linear_method: Optional[LinearMethodBase] = None,
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):
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super().__init__()
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self.d_model = config.d_model
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self.total_num_heads = config.n_heads
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self.head_dim = self.d_model // self.total_num_heads
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self.total_num_kv_heads = config.attn_config.kv_n_heads
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self.clip_qkv = config.attn_config.clip_qkv
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self.rope_theta = config.attn_config.rope_theta
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self.max_position = config.max_seq_len
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# pylint: disable=invalid-name
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self.Wqkv = QKVParallelLinear(
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self.d_model,
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self.head_dim,
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self.total_num_heads,
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self.total_num_kv_heads,
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bias=False,
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linear_method=linear_method,
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)
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self.out_proj = RowParallelLinear(
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self.d_model,
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self.d_model,
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bias=False,
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linear_method=linear_method,
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)
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self.rotary_emb = get_rope(
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self.head_dim,
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rotary_dim=self.head_dim,
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max_position=self.max_position,
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base=int(self.rope_theta),
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is_neox_style=True,
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)
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tp_world_size = get_tensor_model_parallel_world_size()
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self.tp_size = tp_world_size
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assert self.total_num_heads % tp_world_size == 0
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self.num_heads = self.total_num_heads // tp_world_size
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if self.total_num_kv_heads >= tp_world_size:
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# Number of KV heads is greater than TP size, so we partition
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# the KV heads across multiple tensor parallel GPUs.
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assert self.total_num_kv_heads % tp_world_size == 0
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else:
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# Number of KV heads is less than TP size, so we replicate
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# the KV heads across multiple tensor parallel GPUs.
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assert tp_world_size % self.total_num_kv_heads == 0
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self.num_kv_heads = max(1, self.total_num_kv_heads // tp_world_size)
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self.q_size = self.num_heads * self.head_dim
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self.kv_size = self.num_kv_heads * self.head_dim
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self.scaling = self.head_dim**-0.5
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self.attn = RadixAttention(
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self.num_heads,
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self.head_dim,
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self.scaling,
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num_kv_heads=self.num_kv_heads,
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layer_id=layer_id,
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)
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def forward(
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self,
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position_ids: torch.Tensor,
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hidden_states: torch.Tensor,
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input_metadata: InputMetadata,
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) -> torch.Tensor:
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qkv, _ = self.Wqkv(hidden_states)
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if self.clip_qkv is not None:
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qkv.clamp_(min=-self.clip_qkv, max=self.clip_qkv)
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q, k, v = qkv.split([self.q_size, self.kv_size, self.kv_size], dim=-1)
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q, k = self.rotary_emb(position_ids, q, k)
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attn_output = self.attn(q, k, v, input_metadata)
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hidden_states, _ = self.out_proj(attn_output)
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return hidden_states
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class DbrxFusedNormAttention(nn.Module):
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def __init__(
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self,
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config: DbrxConfig,
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layer_id: int = 0,
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linear_method: Optional[LinearMethodBase] = None,
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):
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super().__init__()
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self.d_model = config.d_model
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self.attn = DbrxAttention(config, layer_id, linear_method)
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self.norm_1 = nn.LayerNorm(self.d_model)
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self.norm_2 = nn.LayerNorm(self.d_model)
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def forward(
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self,
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position_ids: torch.Tensor,
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hidden_states: torch.Tensor,
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input_metadata: InputMetadata,
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) -> torch.Tensor:
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residual = hidden_states
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hidden_states = self.norm_1(hidden_states)
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x = self.attn(
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position_ids=position_ids,
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hidden_states=hidden_states,
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input_metadata=input_metadata,
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)
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hidden_states = residual + x
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residual = hidden_states
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hidden_states = self.norm_2(hidden_states)
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return hidden_states, residual
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class DbrxBlock(nn.Module):
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def __init__(
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self,
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config: DbrxConfig,
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layer_id: int = 0,
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linear_method: Optional[LinearMethodBase] = None,
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):
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super().__init__()
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self.norm_attn_norm = DbrxFusedNormAttention(config, layer_id, linear_method)
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self.ffn = DbrxExperts(config, linear_method)
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def forward(
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self,
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position_ids: torch.Tensor,
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hidden_states: torch.Tensor,
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input_metadata: InputMetadata,
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) -> torch.Tensor:
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hidden_states, residual = self.norm_attn_norm(
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position_ids=position_ids,
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hidden_states=hidden_states,
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input_metadata=input_metadata,
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)
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hidden_states = self.ffn(hidden_states)
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hidden_states = hidden_states + residual
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return hidden_states
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class DbrxModel(nn.Module):
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def __init__(
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self,
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config: DbrxConfig,
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linear_method: Optional[LinearMethodBase] = None,
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):
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super().__init__()
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self.wte = VocabParallelEmbedding(
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config.vocab_size,
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config.d_model,
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)
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self.blocks = nn.ModuleList(
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[DbrxBlock(config, i, linear_method) for i in range(config.n_layers)]
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)
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self.norm_f = nn.LayerNorm(config.d_model, eps=1e-5)
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for module in self.modules():
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if hasattr(module, "bias") and isinstance(module.bias, nn.Parameter):
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# Remove the bias term in Linear and LayerNorm.
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module.register_parameter("bias", None)
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def forward(
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self,
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input_ids: torch.Tensor,
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position_ids: torch.Tensor,
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input_metadata: InputMetadata,
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input_embeds: torch.Tensor = None,
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) -> torch.Tensor:
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if input_embeds is None:
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hidden_states = self.wte(input_ids)
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else:
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hidden_states = input_embeds
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for i in range(len(self.blocks)):
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block = self.blocks[i]
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hidden_states = block(position_ids, hidden_states, input_metadata)
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hidden_states = self.norm_f(hidden_states)
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return hidden_states
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class DbrxForCausalLM(nn.Module):
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def __init__(
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self,
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config: DbrxConfig,
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linear_method: Optional[LinearMethodBase] = None,
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):
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super().__init__()
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self.config = config
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self.linear_method = linear_method
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self.unpadded_vocab_size = config.vocab_size
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self.transformer = DbrxModel(config, linear_method)
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self.lm_head = ParallelLMHead(
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config.vocab_size,
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config.d_model,
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org_num_embeddings=config.vocab_size,
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padding_size=DEFAULT_VOCAB_PADDING_SIZE,
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)
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self.logits_processor = LogitsProcessor(config)
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def forward(
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self,
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input_ids: torch.Tensor,
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positions: torch.Tensor,
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input_metadata: InputMetadata,
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) -> torch.Tensor:
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hidden_states = self.transformer(input_ids, positions, input_metadata)
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return self.logits_processor(
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input_ids, hidden_states, self.lm_head.weight, input_metadata
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)
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def load_weights(
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self,
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model_name_or_path: str,
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cache_dir: Optional[str] = None,
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load_format: str = "auto",
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revision: Optional[str] = None,
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):
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expert_params_mapping = [
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(
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"ws" if weight_name in ["w1", "v1"] else "w2s",
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f"experts.mlp.{weight_name}",
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)
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for weight_name in ["w1", "v1", "w2"]
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]
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params_dict = dict(self.named_parameters(remove_duplicate=False))
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for name, loaded_weight in hf_model_weights_iterator(
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model_name_or_path, cache_dir, load_format, revision
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):
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for param_name, weight_name in expert_params_mapping:
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if weight_name not in name:
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continue
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name = name.replace(weight_name, param_name)
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param = params_dict[name]
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weight_loader = param.weight_loader
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weight_loader(param, loaded_weight, weight_name)
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break
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else:
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param = params_dict[name]
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weight_loader = getattr(param, "weight_loader", default_weight_loader)
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weight_loader(param, loaded_weight)
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EntryClass = DbrxForCausalLM
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