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[Bugfix] Fix compressed-tensors models failing to load with transformers backend (#30287)

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Signed-off-by: mgoin <mgoin64@gmail.com>
Signed-off-by: Michael Goin <mgoin64@gmail.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
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Michael Goin 2025-12-08 23:44:28 -05:00 committed by GitHub
parent f6227c22ab
commit 03b91f7262
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1 changed files with 30 additions and 9 deletions
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39
vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors.py
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@ -116,16 +116,37 @@ class CompressedTensorsConfig(QuantizationConfig):
return "compressed-tensors"
def apply_vllm_mapper(self, hf_to_vllm_mapper: "WeightsMapper"):
self.target_scheme_map = hf_to_vllm_mapper.apply_dict(self.target_scheme_map)
self.ignore = hf_to_vllm_mapper.apply_list(self.ignore)
self.sparsity_scheme_map = hf_to_vllm_mapper.apply_dict(
self.sparsity_scheme_map
)
self.sparsity_ignore_list = hf_to_vllm_mapper.apply_list(
self.sparsity_ignore_list
)
"""
Transform layer paths in config targets to match vLLM's naming.
The WeightsMapper is designed for weight paths, but some backends
(e.g. transformers) use broad prefix mappings like "" -> "model."
which would incorrectly transform non-path targets.
compressed-tensors targets can be:
- Layer paths: "layers.0.self_attn.q_proj" -> transformed
- Module class names: "Linear" -> preserved (no ".")
- Regex patterns: "re:.*proj" -> preserved (starts with "re:")
"""
def _map_target(target: str) -> str | None:
is_layer_path = "." in target and not target.startswith("re:")
if is_layer_path:
return hf_to_vllm_mapper._map_name(target)
return target
def _apply_dict(d: dict) -> dict:
return {k: v for t, v in d.items() if (k := _map_target(t)) is not None}
def _apply_list(lst: list) -> list:
return [t for x in lst if (t := _map_target(x)) is not None]
self.target_scheme_map = _apply_dict(self.target_scheme_map)
self.ignore = _apply_list(self.ignore)
self.sparsity_scheme_map = _apply_dict(self.sparsity_scheme_map)
self.sparsity_ignore_list = _apply_list(self.sparsity_ignore_list)
if self.kv_cache_scheme is not None:
self.kv_cache_scheme = hf_to_vllm_mapper.apply_dict(self.kv_cache_scheme)
self.kv_cache_scheme = _apply_dict(self.kv_cache_scheme)
def get_quant_method(
self,