424 lines
14 KiB
Python
424 lines
14 KiB
Python
"""
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Copyright 2023-2024 SGLang Team
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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"""
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# Adapted from
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# https://github.com/vllm-project/vllm/blob/c7f2cf2b7f67bce5842fedfdba508440fe257375/vllm/model_executor/models/mixtral.py#L1
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"""Inference-only Grok1 model."""
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import warnings
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from typing import Iterable, List, Optional, Tuple
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import torch
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import torch.nn.functional as F
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from torch import nn
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from transformers import PretrainedConfig
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from vllm.distributed 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.layers.rotary_embedding import get_rope
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from vllm.model_executor.layers.vocab_parallel_embedding import (
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ParallelLMHead,
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VocabParallelEmbedding,
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)
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from vllm.model_executor.model_loader.loader import DefaultModelLoader
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from vllm.model_executor.model_loader.weight_utils import default_weight_loader
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from sglang.srt.layers.fused_moe import FusedMoE
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from sglang.srt.layers.layernorm import RMSNorm
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from sglang.srt.layers.linear import (
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QKVParallelLinear,
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ReplicatedLinear,
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RowParallelLinear,
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)
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from sglang.srt.layers.logits_processor import LogitsProcessor
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from sglang.srt.layers.quantization.base_config import QuantizationConfig
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from sglang.srt.layers.radix_attention import RadixAttention
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from sglang.srt.model_executor.forward_batch_info import ForwardBatch
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class Grok1MoE(nn.Module):
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"""A tensor-parallel MoE implementation for Grok1 that shards each expert
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across all ranks.
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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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num_experts: int,
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top_k: int,
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hidden_size: int,
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intermediate_size: int,
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params_dtype: Optional[torch.dtype] = None,
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quant_config: Optional[QuantizationConfig] = None,
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tp_size: Optional[int] = None,
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):
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super().__init__()
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self.hidden_size = hidden_size
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# Gate always runs at half / full precision for now.
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self.gate = ReplicatedLinear(
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hidden_size,
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num_experts,
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bias=False,
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params_dtype=params_dtype,
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quant_config=None,
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)
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self.experts = FusedMoE(
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num_experts=num_experts,
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top_k=top_k,
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hidden_size=hidden_size,
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intermediate_size=intermediate_size,
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params_dtype=params_dtype,
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reduce_results=True,
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renormalize=False,
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quant_config=quant_config,
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tp_size=tp_size,
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)
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def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
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# NOTE: hidden_states can have either 1D or 2D shape.
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orig_shape = hidden_states.shape
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hidden_states = hidden_states.view(-1, self.hidden_size)
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# router_logits: (num_tokens, n_experts)
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router_logits, _ = self.gate(hidden_states)
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router_logits = 30.0 * F.tanh(router_logits / 30.0)
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final_hidden_states = self.experts(hidden_states, router_logits)
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return final_hidden_states.view(orig_shape)
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class Grok1Attention(nn.Module):
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def __init__(
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self,
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hidden_size: int,
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num_heads: int,
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num_kv_heads: int,
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layer_id: int = 0,
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max_position: int = 4096 * 32,
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rope_theta: float = 10000,
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logit_cap: float = 30,
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quant_config: Optional[QuantizationConfig] = None,
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) -> None:
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super().__init__()
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self.hidden_size = hidden_size
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tp_size = get_tensor_model_parallel_world_size()
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self.total_num_heads = num_heads
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assert self.total_num_heads % tp_size == 0
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self.num_heads = self.total_num_heads // tp_size
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self.total_num_kv_heads = num_kv_heads
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if self.total_num_kv_heads >= tp_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_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_size % self.total_num_kv_heads == 0
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self.num_kv_heads = max(1, self.total_num_kv_heads // tp_size)
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self.head_dim = 128
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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.rope_theta = rope_theta
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self.qkv_proj = QKVParallelLinear(
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hidden_size,
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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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quant_config=quant_config,
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)
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self.o_proj = RowParallelLinear(
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self.total_num_heads * self.head_dim,
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hidden_size,
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bias=False,
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quant_config=quant_config,
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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=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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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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logit_cap=logit_cap,
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)
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# TODO(lianmin): load logit cap from config
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def forward(
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self,
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positions: torch.Tensor,
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hidden_states: torch.Tensor,
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forward_batch: ForwardBatch,
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) -> torch.Tensor:
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qkv, _ = self.qkv_proj(hidden_states)
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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(positions, q, k)
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attn_output = self.attn(q, k, v, forward_batch)
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output, _ = self.o_proj(attn_output)
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return output
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class Grok1DecoderLayer(nn.Module):
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def __init__(
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self,
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config: PretrainedConfig,
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layer_id: int = 0,
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quant_config: Optional[QuantizationConfig] = None,
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) -> None:
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super().__init__()
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self.hidden_size = config.hidden_size
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rope_theta = getattr(config, "rope_theta", 10000)
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self.self_attn = Grok1Attention(
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hidden_size=self.hidden_size,
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num_heads=config.num_attention_heads,
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max_position=config.max_position_embeddings,
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num_kv_heads=config.num_key_value_heads,
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layer_id=layer_id,
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rope_theta=rope_theta,
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quant_config=quant_config,
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)
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self.block_sparse_moe = Grok1MoE(
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num_experts=config.num_local_experts,
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top_k=config.num_experts_per_tok,
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hidden_size=config.hidden_size,
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intermediate_size=config.intermediate_size,
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quant_config=quant_config,
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)
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self.pre_attn_norm = RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
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self.post_attn_norm = RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
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self.pre_moe_norm = RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
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self.post_moe_norm = RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
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def forward(
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self,
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positions: torch.Tensor,
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hidden_states: torch.Tensor,
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forward_batch: ForwardBatch,
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) -> torch.Tensor:
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# Self Attention
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hidden_states = (
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self.post_attn_norm(
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self.self_attn(
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positions=positions,
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hidden_states=self.pre_attn_norm(hidden_states),
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forward_batch=forward_batch,
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)
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)
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+ hidden_states
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)
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# Fully Connected
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hidden_states = (
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self.post_moe_norm(self.block_sparse_moe(self.pre_moe_norm(hidden_states)))
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+ hidden_states
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)
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return hidden_states
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class Grok1Model(nn.Module):
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def __init__(
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self,
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config: PretrainedConfig,
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quant_config: Optional[QuantizationConfig] = None,
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) -> None:
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super().__init__()
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self.config = config
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self.padding_idx = config.pad_token_id
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self.vocab_size = config.vocab_size
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self.embed_tokens = VocabParallelEmbedding(
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config.vocab_size,
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config.hidden_size,
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)
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self.layers = nn.ModuleList(
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[
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Grok1DecoderLayer(config, i, quant_config=quant_config)
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for i in range(config.num_hidden_layers)
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]
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)
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self.norm = RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
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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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forward_batch: ForwardBatch,
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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.embed_tokens(input_ids)
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hidden_states.mul_(self.config.embedding_multiplier_scale)
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else:
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hidden_states = input_embeds
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for i in range(len(self.layers)):
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hidden_states = self.layers[i](positions, hidden_states, forward_batch)
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hidden_states = self.norm(hidden_states)
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hidden_states.mul_(self.config.output_multiplier_scale)
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return hidden_states
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class Grok1ForCausalLM(nn.Module):
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def __init__(
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self,
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config: PretrainedConfig,
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quant_config: Optional[QuantizationConfig] = None,
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cache_config=None,
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) -> None:
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super().__init__()
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self.config = config
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self.quant_config = quant_config
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self.model = Grok1Model(config, quant_config=quant_config)
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self.lm_head = ParallelLMHead(config.vocab_size, config.hidden_size)
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self.logits_processor = LogitsProcessor(config)
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# Monkey patch _prepare_weights to load pre-sharded weights
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setattr(DefaultModelLoader, "_prepare_weights", _prepare_presharded_weights)
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self.use_presharded_weights = True
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warnings.filterwarnings("ignore", category=FutureWarning)
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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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forward_batch: ForwardBatch,
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input_embeds: torch.Tensor = None,
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) -> torch.Tensor:
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hidden_states = self.model(input_ids, positions, forward_batch, input_embeds)
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return self.logits_processor(
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input_ids, hidden_states, self.lm_head.weight, forward_batch
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)
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def load_weights(self, weights: Iterable[Tuple[str, torch.Tensor]]):
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stacked_params_mapping = [
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# (param_name, shard_name, shard_id)
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("qkv_proj", "q_proj", "q"),
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("qkv_proj", "k_proj", "k"),
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("qkv_proj", "v_proj", "v"),
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]
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# Params for weights, fp8 weight scales, fp8 activation scales
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# (param_name, weight_name, expert_id, shard_id)
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expert_params_mapping = FusedMoE.make_expert_params_mapping(
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ckpt_gate_proj_name="w1",
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ckpt_down_proj_name="w2",
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ckpt_up_proj_name="w3",
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num_experts=self.config.num_local_experts,
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)
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params_dict = dict(self.named_parameters())
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for name, loaded_weight in weights:
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if "rotary_emb.inv_freq" in name:
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continue
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for param_name, weight_name, shard_id in stacked_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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# Skip loading extra bias for GPTQ models.
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if name.endswith(".bias") and name not in params_dict:
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continue
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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, shard_id)
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break
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else:
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for mapping in expert_params_mapping:
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param_name, weight_name, expert_id, shard_id = 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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if self.use_presharded_weights:
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extra_kwargs = {
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"use_presharded_weights": self.use_presharded_weights
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}
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else:
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extra_kwargs = {}
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param = params_dict[name]
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weight_loader = param.weight_loader
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weight_loader(
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param,
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loaded_weight,
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weight_name,
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shard_id=shard_id,
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expert_id=expert_id,
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**extra_kwargs,
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)
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break
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else:
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# Skip loading extra bias for GPTQ models.
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if name.endswith(".bias") and name not in params_dict:
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continue
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if name is None:
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continue
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param = params_dict[name]
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weight_loader = getattr(
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param, "weight_loader", default_weight_loader
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)
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weight_loader(param, loaded_weight)
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old_prepare_weights = getattr(DefaultModelLoader, "_prepare_weights")
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def _prepare_presharded_weights(
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self, model_name_or_path: str, revision: Optional[str], fall_back_to_pt: bool
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) -> Tuple[str, List[str], bool]:
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import glob
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import os
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if get_tensor_model_parallel_world_size() == 1:
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return old_prepare_weights(self, model_name_or_path, revision, fall_back_to_pt)
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tp_rank = get_tensor_model_parallel_rank()
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allow_patterns = [f"*-{tp_rank:03d}.bin"]
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hf_folder = model_name_or_path
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hf_weights_files: List[str] = []
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for pattern in allow_patterns:
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hf_weights_files += glob.glob(os.path.join(hf_folder, pattern))
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use_safetensors = False
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return hf_folder, hf_weights_files, use_safetensors
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class Grok1ModelForCausalLM(Grok1ForCausalLM):
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"""An alias for backward-compatbility."""
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pass
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EntryClass = [Grok1ForCausalLM, Grok1ModelForCausalLM]
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