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25 lines
1.1 KiB
Python
25 lines
1.1 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
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"""Inference-only HF format GLM-4 model compatible with THUDM weights."""
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from vllm.config import VllmConfig
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from vllm.model_executor.models.llama import LlamaForCausalLM
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from .utils import PPMissingLayer
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class GlmForCausalLM(LlamaForCausalLM):
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def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
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hf_config = vllm_config.model_config.hf_config
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hf_config.rope_parameters["partial_rotary_factor"] = 0.5
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super().__init__(vllm_config=vllm_config, prefix=prefix)
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# Hack Llama model to fit HF format GLM implementation
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# Attention difference between GLM and Llama:
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# 1. Half partial rotary_dim and no Neox style.
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# 2. There is no bias for o_proj in attention
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for layer in self.model.layers:
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if not isinstance(layer, PPMissingLayer):
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layer.self_attn.rotary_emb.is_neox_style = False
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layer.self_attn.o_proj.bias = None
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layer.self_attn.o_proj.skip_bias_add = True
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