427 lines
14 KiB
Python
427 lines
14 KiB
Python
# 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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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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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/THUDM/ChatGLM2-6B
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"""Inference-only ChatGLM model compatible with THUDM weights."""
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from typing import Iterable, 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 sglang.srt.configs import ChatGLMConfig
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from sglang.srt.distributed import get_tensor_model_parallel_world_size
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from sglang.srt.layers.activation import SiluAndMul
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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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MergedColumnParallelLinear,
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QKVParallelLinear,
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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.layers.rotary_embedding import get_rope
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from sglang.srt.layers.vocab_parallel_embedding import (
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ParallelLMHead,
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VocabParallelEmbedding,
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)
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from sglang.srt.model_executor.forward_batch_info import ForwardBatch
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from sglang.srt.model_loader.weight_utils import default_weight_loader
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from sglang.srt.utils import add_prefix
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LoraConfig = None
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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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layer_id: int = 0,
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quant_config: Optional[QuantizationConfig] = None,
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prefix: str = "",
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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 = (
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config.multi_query_group_num
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if config.multi_query_attention
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else config.num_attention_heads
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)
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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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quant_config=quant_config,
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prefix=add_prefix("query_key_value", prefix),
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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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quant_config=quant_config,
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prefix=add_prefix("dense", prefix),
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)
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# https://huggingface.co/THUDM/chatglm3-6b-32k/blob/e210410255278dd9d74463cf396ba559c0ef801c/modeling_chatglm.py#L141
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rope_ratio = getattr(config, "rope_ratio", 1.0)
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max_positions = getattr(config, "seq_length", 8192)
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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 // 2,
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max_position=max_positions,
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base=10000 * rope_ratio,
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is_neox_style=False,
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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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prefix=add_prefix("attn", prefix),
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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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forward_batch: ForwardBatch,
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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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q, k = self.rotary_emb(position_ids, q, k)
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context_layer = self.attn(
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q,
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k,
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v,
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forward_batch,
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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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quant_config: Optional[QuantizationConfig] = None,
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prefix: str = "",
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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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quant_config=quant_config,
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prefix=add_prefix("dense_h_to_4h", prefix),
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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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quant_config=quant_config,
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prefix=add_prefix("dense_4h_to_h", prefix),
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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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layer_id: int,
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quant_config: Optional[QuantizationConfig] = None,
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prefix: str = "",
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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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)
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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(
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config.hidden_size, eps=config.layernorm_epsilon
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)
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# Self attention.
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self.self_attention = GLMAttention(
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config, layer_id, quant_config, prefix=add_prefix("self_attention", prefix)
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)
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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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)
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# MLP
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self.mlp = GLMMLP(config, quant_config, prefix=add_prefix("mlp", prefix))
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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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forward_batch: ForwardBatch,
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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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forward_batch=forward_batch,
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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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quant_config: Optional[QuantizationConfig] = None,
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prefix: str = "",
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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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[
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GLMBlock(
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config,
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i,
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quant_config,
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prefix=add_prefix(f"layers.{i}", prefix),
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)
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for i in range(self.num_layers)
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]
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)
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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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)
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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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forward_batch: ForwardBatch,
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) -> torch.Tensor:
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for i in range(self.num_layers):
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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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forward_batch=forward_batch,
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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 ChatGLMM(nn.Module):
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def __init__(
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self,
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config,
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quant_config: Optional[QuantizationConfig] = None,
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prefix: str = "",
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):
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super().__init__()
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self.embedding = VocabParallelEmbedding(
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config.padded_vocab_size,
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config.hidden_size,
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prefix=add_prefix("embedding", prefix),
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)
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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(
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config, quant_config, add_prefix("encoder", prefix)
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)
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self.output_layer = ParallelLMHead(
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config.padded_vocab_size,
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config.hidden_size,
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prefix=add_prefix("output_layer", prefix),
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)
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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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forward_batch: ForwardBatch,
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) -> torch.Tensor:
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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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forward_batch=forward_batch,
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)
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return hidden_states
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class ChatGLMForCausalLM(nn.Module):
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packed_modules_mapping = {
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"query_key_value": ["query_key_value"],
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"dense_h_to_4h": ["dense_h_to_4h"],
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}
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# LoRA specific attributes
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supported_lora_modules = [
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"query_key_value",
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"dense",
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"dense_h_to_4h",
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"dense_4h_to_h",
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]
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embedding_modules = {}
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embedding_padding_modules = []
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def __init__(
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self,
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config: ChatGLMConfig,
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quant_config: Optional[QuantizationConfig] = None,
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prefix: str = "",
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):
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super().__init__()
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self.config: ChatGLMConfig = config
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self.quant_config = quant_config
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self.max_position_embeddings = getattr(config, "max_sequence_length", 8192)
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self.transformer = ChatGLMM(
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config, quant_config, prefix=add_prefix("transformer", prefix)
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)
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self.lm_head = self.transformer.output_layer
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self.logits_processor = LogitsProcessor(config)
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@torch.no_grad()
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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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) -> torch.Tensor:
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hidden_states = self.transformer(input_ids, positions, forward_batch)
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return self.logits_processor(
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input_ids, hidden_states, self.lm_head, forward_batch
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)
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def load_weights(self, weights: Iterable[Tuple[str, torch.Tensor]]):
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params_dict = dict(self.named_parameters(remove_duplicate=False))
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for name, loaded_weight in weights:
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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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# 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 = getattr(param, "weight_loader", default_weight_loader)
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weight_loader(param, loaded_weight)
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class ChatGLMModel(ChatGLMForCausalLM):
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pass
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EntryClass = [ChatGLMModel]
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