Zhuohan Li
7076fa1c9f
Refactor the tensor parallelism, quantization, and weight-loading codes. Summary of the new features enabled by this PR: - **All models** are able to be quantized with AWQ and SqueezeLLM, and [soon GPTQ](https://github.com/vllm-project/vllm/pull/1580). - Model loading code became much simpler. - Support model parallelism for all MQA/GQA models when the number of key/value heads is smaller than the tensor parallel size.
377 lines
12 KiB
Python
377 lines
12 KiB
Python
# coding=utf-8
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# Adapted from
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# https://github.com/THUDM/ChatGLM2-6B
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"""Inference-only ChatGLM model compatible with THUDM weights.
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The input of the model is flattened to a 1D tensor of tokens. The model uses
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InputMetadata to extract the original 2D shape of the input.
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"""
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from typing import List, Optional, Tuple
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import torch
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from torch import nn
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from torch.nn import LayerNorm
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from vllm.model_executor.input_metadata import InputMetadata
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from vllm.model_executor.layers.activation import SiluAndMul
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from vllm.model_executor.layers.attention import PagedAttentionWithRoPE
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from vllm.model_executor.layers.layernorm import RMSNorm
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from vllm.model_executor.layers.linear import (LinearMethodBase,
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MergedColumnParallelLinear,
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QKVParallelLinear,
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RowParallelLinear)
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from vllm.model_executor.layers.sampler import Sampler
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from vllm.model_executor.layers.vocab_parallel_embedding import (
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VocabParallelEmbedding, ParallelLMHead)
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from vllm.model_executor.parallel_utils.parallel_state import (
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get_tensor_model_parallel_world_size)
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from vllm.model_executor.weight_utils import (default_weight_loader,
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hf_model_weights_iterator)
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from vllm.sequence import SamplerOutput
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from vllm.transformers_utils.configs import ChatGLMConfig
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KVCache = Tuple[torch.Tensor, torch.Tensor]
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class GLMAttention(nn.Module):
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def __init__(
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self,
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config,
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linear_method: Optional[LinearMethodBase] = None,
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):
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super().__init__()
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self.hidden_size = config.hidden_size
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tp_size = get_tensor_model_parallel_world_size()
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self.total_num_heads = config.num_attention_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.multi_query_attention = config.multi_query_attention
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self.total_num_kv_heads = (config.multi_query_group_num
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if config.multi_query_attention else
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config.num_attention_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 = config.hidden_size // self.total_num_heads
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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.query_key_value = QKVParallelLinear(
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self.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=config.add_bias_linear or config.add_qkv_bias,
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linear_method=linear_method,
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)
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self.dense = RowParallelLinear(
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self.total_num_heads * self.head_dim,
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config.hidden_size,
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bias=config.add_bias_linear,
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linear_method=linear_method,
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)
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self.attn = PagedAttentionWithRoPE(
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self.num_heads,
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self.head_dim,
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self.scaling,
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rotary_dim=self.head_dim // 2,
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num_kv_heads=self.num_kv_heads,
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is_neox_style=False,
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)
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def forward(
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self,
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hidden_states: torch.Tensor,
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position_ids: torch.Tensor,
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kv_cache: KVCache,
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input_metadata: InputMetadata,
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cache_event: Optional[torch.cuda.Event],
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) -> torch.Tensor:
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qkv, _ = self.query_key_value(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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key_cache, value_cache = kv_cache
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context_layer = self.attn(
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position_ids,
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q,
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k,
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v,
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key_cache,
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value_cache,
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input_metadata,
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cache_event,
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)
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attn_output, _ = self.dense(context_layer)
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return attn_output
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class GLMMLP(nn.Module):
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"""MLP.
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MLP will take the input with h hidden state, project it to 4*h
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hidden dimension, perform nonlinear transformation, and project the
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state back into h hidden dimension.
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"""
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def __init__(
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self,
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config,
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linear_method: Optional[LinearMethodBase] = None,
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):
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super().__init__()
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self.add_bias = config.add_bias_linear
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# Project to 4h.
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self.dense_h_to_4h = MergedColumnParallelLinear(
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config.hidden_size,
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[config.ffn_hidden_size] * 2,
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bias=config.add_bias_linear,
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linear_method=linear_method,
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)
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self.activation_func = SiluAndMul()
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# Project back to h.
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self.dense_4h_to_h = RowParallelLinear(
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config.ffn_hidden_size,
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config.hidden_size,
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bias=config.add_bias_linear,
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linear_method=linear_method,
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)
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def forward(self, hidden_states):
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# [s, b, 4hp]
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intermediate_parallel, _ = self.dense_h_to_4h(hidden_states)
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intermediate_parallel = self.activation_func(intermediate_parallel)
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# [s, b, h]
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output, _ = self.dense_4h_to_h(intermediate_parallel)
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return output
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class GLMBlock(nn.Module):
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"""A single transformer layer.
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Transformer layer takes input with size [s, b, h] and returns an
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output of the same size.
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"""
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def __init__(
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self,
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config,
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linear_method: Optional[LinearMethodBase] = None,
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):
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super().__init__()
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self.apply_residual_connection_post_layernorm = (
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config.apply_residual_connection_post_layernorm)
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self.fp32_residual_connection = config.fp32_residual_connection
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layer_norm_func = RMSNorm if config.rmsnorm else LayerNorm
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# Layernorm on the input data.
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self.input_layernorm = layer_norm_func(config.hidden_size,
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eps=config.layernorm_epsilon)
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# Self attention.
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self.self_attention = GLMAttention(config, linear_method)
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self.hidden_dropout = config.hidden_dropout
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# Layernorm on the attention output
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self.post_attention_layernorm = layer_norm_func(
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config.hidden_size, eps=config.layernorm_epsilon)
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# MLP
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self.mlp = GLMMLP(config, linear_method)
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def forward(
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self,
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hidden_states: torch.Tensor,
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position_ids: torch.Tensor,
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kv_cache: KVCache,
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input_metadata: InputMetadata,
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cache_event: Optional[torch.cuda.Event],
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) -> torch.Tensor:
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# hidden_states: [num_tokens, h]
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# Layer norm at the beginning of the transformer layer.
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layernorm_output = self.input_layernorm(hidden_states)
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# Self attention.
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attention_output = self.self_attention(
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hidden_states=layernorm_output,
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position_ids=position_ids,
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kv_cache=kv_cache,
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input_metadata=input_metadata,
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cache_event=cache_event,
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)
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# Residual connection.
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if self.apply_residual_connection_post_layernorm:
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residual = layernorm_output
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else:
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residual = hidden_states
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layernorm_input = residual + attention_output
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# Layer norm post the self attention.
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layernorm_output = self.post_attention_layernorm(layernorm_input)
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# Second residual connection.
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if self.apply_residual_connection_post_layernorm:
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residual = layernorm_output
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else:
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residual = layernorm_input
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output = self.mlp(layernorm_output) + residual
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return output
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class GLMTransformer(nn.Module):
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"""Transformer class."""
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def __init__(
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self,
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config,
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linear_method: Optional[LinearMethodBase] = None,
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):
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super().__init__()
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self.post_layer_norm = config.post_layer_norm
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# Number of layers.
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self.num_layers = config.num_layers
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# Transformer layers.
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self.layers = nn.ModuleList(
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[GLMBlock(config, linear_method) for i in range(self.num_layers)])
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if self.post_layer_norm:
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layer_norm_func = RMSNorm if config.rmsnorm else LayerNorm
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# Final layer norm before output.
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self.final_layernorm = layer_norm_func(
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config.hidden_size, eps=config.layernorm_epsilon)
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def forward(
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self,
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hidden_states: torch.Tensor,
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position_ids: torch.Tensor,
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kv_caches: List[KVCache],
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input_metadata: InputMetadata,
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cache_events: Optional[List[torch.cuda.Event]],
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) -> torch.Tensor:
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for i in range(self.num_layers):
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if cache_events is None:
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cache_event = None
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else:
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cache_event = cache_events[i]
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layer = self.layers[i]
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hidden_states = layer(
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hidden_states=hidden_states,
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position_ids=position_ids,
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kv_cache=kv_caches[i],
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input_metadata=input_metadata,
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cache_event=cache_event,
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)
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# Final layer norm.
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if self.post_layer_norm:
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hidden_states = self.final_layernorm(hidden_states)
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return hidden_states
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class ChatGLMModel(nn.Module):
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def __init__(
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self,
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config,
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linear_method: Optional[LinearMethodBase] = None,
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):
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super().__init__()
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self.embedding = VocabParallelEmbedding(config.padded_vocab_size,
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config.hidden_size)
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self.num_layers = config.num_layers
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self.multi_query_group_num = config.multi_query_group_num
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self.kv_channels = config.kv_channels
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self.encoder = GLMTransformer(config, linear_method)
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self.output_layer = ParallelLMHead(config.padded_vocab_size,
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config.hidden_size)
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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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kv_caches: List[KVCache],
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input_metadata: InputMetadata,
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cache_events: Optional[List[torch.cuda.Event]],
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):
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inputs_embeds = self.embedding(input_ids)
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# Run encoder.
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hidden_states = self.encoder(
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hidden_states=inputs_embeds,
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position_ids=position_ids,
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kv_caches=kv_caches,
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input_metadata=input_metadata,
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cache_events=cache_events,
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)
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return hidden_states
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class ChatGLMForCausalLM(nn.Module):
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def __init__(
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self,
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config: ChatGLMConfig,
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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: ChatGLMConfig = config
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self.linear_method = linear_method
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self.transformer = ChatGLMModel(config, linear_method)
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self.lm_head_weight = self.transformer.output_layer.weight
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self.sampler = Sampler(config.padded_vocab_size)
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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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kv_caches: List[KVCache],
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input_metadata: InputMetadata,
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cache_events: Optional[List[torch.cuda.Event]],
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) -> SamplerOutput:
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hidden_states = self.transformer(input_ids, positions, kv_caches,
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input_metadata, cache_events)
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next_tokens = self.sampler(self.lm_head_weight, hidden_states,
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input_metadata)
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return next_tokens
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def load_weights(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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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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if "rotary_pos_emb.inv_freq" in name:
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continue
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if "word_embeddings" in name:
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name = name.replace(".word_embeddings", "")
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param = params_dict[name]
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weight_loader = getattr(param, "weight_loader",
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default_weight_loader)
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weight_loader(param, loaded_weight)
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