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+# SPDX-License-Identifier: Apache-2.0
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+
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+# Copyright 2025 The Zhipu AI team.
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+# Copyright 2023 The vLLM team.
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+# Copyright 2022 EleutherAI and the HuggingFace Inc. team. All rights reserved.
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+#
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+# This code is based on EleutherAI's GPT-NeoX library and the GPT-NeoX
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+# and OPT implementations in this library. It has been modified from its
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+# original forms to accommodate minor architectural differences compared
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+# to GPT-NeoX and OPT used by the Meta AI team that trained the model.
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+#
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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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+"""Inference-only GLM-4-0414 model compatible with HuggingFace weights."""
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+from typing import Iterable, Optional, Set, Tuple, Union
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+
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+import torch
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+from torch import nn
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+from transformers import Glm4Config
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+
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+from vllm.attention import Attention, AttentionType
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+from vllm.compilation.decorators import support_torch_compile
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+from vllm.config import CacheConfig, VllmConfig
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+from vllm.distributed import get_pp_group, get_tensor_model_parallel_world_size
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+from vllm.model_executor.layers.layernorm import RMSNorm
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+from vllm.model_executor.layers.linear import (QKVParallelLinear,
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+ RowParallelLinear)
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+from vllm.model_executor.layers.logits_processor import LogitsProcessor
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+from vllm.model_executor.layers.quantization import QuantizationConfig
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+from vllm.model_executor.layers.rotary_embedding import get_rope
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+from vllm.model_executor.layers.sampler import SamplerOutput, get_sampler
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+from vllm.model_executor.layers.vocab_parallel_embedding import ParallelLMHead
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+from vllm.model_executor.sampling_metadata import SamplingMetadata
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+from vllm.sequence import IntermediateTensors
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+
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+from .interfaces import SupportsLoRA, SupportsPP
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+from .llama import LlamaMLP as Glm4MLP
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+from .llama import LlamaModel
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+from .utils import AutoWeightsLoader, PPMissingLayer, maybe_prefix
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+
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+
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+class Glm4Attention(nn.Module):
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+
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+ def __init__(self,
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+ config: Glm4Config,
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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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+ max_position: int = 4096 * 32,
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+ head_dim: Optional[int] = None,
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+ qkv_bias: bool = False,
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+ rope_theta: float = 10000,
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+ cache_config: Optional[CacheConfig] = None,
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+ quant_config: Optional[QuantizationConfig] = None,
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+ rope_scaling: Optional[Tuple] = None,
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+ prefix: str = "",
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+ attn_type: str = AttentionType.DECODER) -> 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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+ partial_rotary_factor = getattr(config, "partial_rotary_factor", 0.5)
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+ self.num_kv_heads = max(1, self.total_num_kv_heads // tp_size)
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+ self.head_dim = head_dim or hidden_size // self.total_num_heads
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+ self.rotary_dim = int(partial_rotary_factor * self.head_dim)
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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=qkv_bias,
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+ quant_config=quant_config,
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+ prefix=f"{prefix}.qkv_proj",
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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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+ prefix=f"{prefix}.o_proj",
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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.rotary_dim,
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+ max_position=max_position,
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+ base=self.rope_theta,
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+ rope_scaling=rope_scaling,
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+ partial_rotary_factor=partial_rotary_factor,
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+ )
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+ self.attn = Attention(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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+ cache_config=cache_config,
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+ quant_config=quant_config,
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+ prefix=f"{prefix}.attn",
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+ attn_type=attn_type)
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+
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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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+ ) -> 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)
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+ output, _ = self.o_proj(attn_output)
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+ return output
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+
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+
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+class Glm4DecoderLayer(nn.Module):
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+
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+ def __init__(
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+ self,
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+ config: Glm4Config,
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+ cache_config: Optional[CacheConfig] = None,
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+ quant_config: Optional[QuantizationConfig] = None,
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+ prefix: str = "",
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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", 1000000)
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+ rope_scaling = getattr(config, "rope_scaling", None)
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+
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+ self.self_attn = Glm4Attention(
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+ config=config,
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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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+ rope_theta=rope_theta,
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+ qkv_bias=getattr(config, 'attention_bias', False),
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+ head_dim=getattr(config, 'head_dim', None),
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+ cache_config=cache_config,
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+ quant_config=quant_config,
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+ rope_scaling=rope_scaling,
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+ prefix=f"{prefix}.self_attn",
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+ attn_type=AttentionType.DECODER,
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+ )
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+ self.mlp = Glm4MLP(
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+ hidden_size=self.hidden_size,
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+ intermediate_size=config.intermediate_size,
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+ hidden_act=config.hidden_act,
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+ quant_config=quant_config,
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+ prefix=f"{prefix}.mlp",
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+ )
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+ self.input_layernorm = RMSNorm(config.hidden_size,
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+ eps=config.rms_norm_eps)
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+ self.post_attention_layernorm = RMSNorm(config.hidden_size,
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+ eps=config.rms_norm_eps)
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+ self.post_self_attn_layernorm = RMSNorm(config.hidden_size,
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+ eps=config.rms_norm_eps)
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+ self.post_mlp_layernorm = RMSNorm(config.hidden_size,
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+ eps=config.rms_norm_eps)
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+
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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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+ residual: Optional[torch.Tensor],
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+ ) -> Tuple[torch.Tensor, torch.Tensor]:
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+ # Self Attention
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+ if residual is None:
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+ residual = hidden_states
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+ hidden_states = self.input_layernorm(hidden_states)
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+ else:
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+ hidden_states, residual = self.input_layernorm(
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+ hidden_states, residual)
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+ hidden_states = self.self_attn(
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+ positions=positions,
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+ hidden_states=hidden_states,
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+ )
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+
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+ hidden_states = self.post_self_attn_layernorm(hidden_states)
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+ hidden_states = residual + hidden_states
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+
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+ # Fully Connected
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+ hidden_states = self.post_attention_layernorm(hidden_states, residual)
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+ hidden_states = self.mlp(hidden_states)
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+ hidden_states = self.post_mlp_layernorm(hidden_states)
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+ hidden_states = residual + hidden_states
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+
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+ return hidden_states, residual
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+
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+
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+ALL_DECODER_LAYER_TYPES = {
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+ "attention": Glm4DecoderLayer,
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+}
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+
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+
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+@support_torch_compile(
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+ dynamic_arg_dims={
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+ "input_ids": 0,
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+ "positions": -1,
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+ "intermediate_tensors": 0,
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+ "inputs_embeds": 0,
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+ })
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+class Glm4Model(LlamaModel):
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+
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+ def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
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+ super().__init__(vllm_config=vllm_config,
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+ prefix=prefix,
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+ layer_type=Glm4DecoderLayer)
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+
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+
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+class Glm4ForCausalLM(nn.Module, SupportsLoRA, SupportsPP):
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+ packed_modules_mapping = {
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+ "qkv_proj": [
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+ "q_proj",
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+ "k_proj",
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+ "v_proj",
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+ ],
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+ "gate_up_proj": [
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+ "gate_proj",
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+ "up_proj",
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+ ],
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+ }
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+
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+ def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
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+ super().__init__()
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+ config = vllm_config.model_config.hf_config
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+ quant_config = vllm_config.quant_config
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+ lora_config = vllm_config.lora_config
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+
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+ self.config = config
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+ self.lora_config = lora_config
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+
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+ self.quant_config = quant_config
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+ self.model = Glm4Model(vllm_config=vllm_config,
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+ prefix=maybe_prefix(prefix, "model"))
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+
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+ if get_pp_group().is_last_rank:
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+ if config.tie_word_embeddings:
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+ self.lm_head = self.model.embed_tokens
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+ else:
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+ self.lm_head = ParallelLMHead(config.vocab_size,
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+ config.hidden_size,
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+ quant_config=quant_config,
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+ prefix=maybe_prefix(
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+ prefix, "lm_head"))
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+ else:
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+ self.lm_head = PPMissingLayer()
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+
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+ self.logits_processor = LogitsProcessor(config.vocab_size)
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+ self.sampler = get_sampler()
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+
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+ self.make_empty_intermediate_tensors = (
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+ self.model.make_empty_intermediate_tensors)
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+
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+ def get_input_embeddings(self, input_ids: torch.Tensor) -> torch.Tensor:
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+ return self.model.get_input_embeddings(input_ids)
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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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+ positions: torch.Tensor,
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+ intermediate_tensors: Optional[IntermediateTensors] = None,
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+ inputs_embeds: Optional[torch.Tensor] = None,
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+ ) -> Union[torch.Tensor, IntermediateTensors]:
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+ hidden_states = self.model(input_ids, positions, intermediate_tensors,
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+ inputs_embeds)
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+ return hidden_states
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+
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+ def compute_logits(
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+ self,
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+ hidden_states: torch.Tensor,
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+ sampling_metadata: SamplingMetadata,
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+ ) -> Optional[torch.Tensor]:
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+ logits = self.logits_processor(self.lm_head, hidden_states,
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+ sampling_metadata)
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+ return logits
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+
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+ def sample(
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+ self,
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+ logits: torch.Tensor,
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+ sampling_metadata: SamplingMetadata,
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+ ) -> Optional[SamplerOutput]:
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+ next_tokens = self.sampler(logits, sampling_metadata)
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+ return next_tokens
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+
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+ def load_weights(self, weights: Iterable[Tuple[str,
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+ torch.Tensor]]) -> Set[str]:
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+ loader = AutoWeightsLoader(
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+ self,
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+ skip_prefixes=(["lm_head."]
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+ if self.config.tie_word_embeddings else None),
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+ )
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+ return loader.load_weights(weights)