[Bugfix][DeepseekV4] Guard compress_ratios access for transformers >= 4.57#42836
[Bugfix][DeepseekV4] Guard compress_ratios access for transformers >= 4.57#42836varjoranta wants to merge 2 commits into
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… 4.57 transformers >= 4.57 normalizes the legacy `compress_ratios` config field into `compress_rates` + `layer_types`, so `config.compress_ratios[layer_id]` raises and DeepSeek V4 fails to load. Guard the access with `hasattr`/`is not None` and fall back to the normalized `compress_rates`/`layer_types` pair. Full repro in vllm-project#42741. Closes vllm-project#42741 Signed-off-by: Hannu Varjoranta <hannu@varjosoft.com>
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This pull request modifies the initialization of compress_ratio in the DeepSeek V4 model executor to provide a fallback mechanism using compress_rates and layer_types when compress_ratios is unavailable. A critical issue was identified regarding potential TypeError and IndexError vulnerabilities when accessing layer_types if the attribute is None or shorter than expected. A code suggestion was provided to safely handle these cases and ensure the robustness of the compression ratio calculation.
| _rates = getattr(config, "compress_rates", {}) or {} | ||
| _types = getattr(config, "layer_types", []) | ||
| self.compress_ratio = max(1, _rates.get(_types[layer_id], 0)) |
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The current implementation has a couple of potential issues that could lead to a crash:
- If
config.layer_typesis explicitly set toNone,getattr(config, "layer_types", [])will returnNone, causing aTypeErrorwhen trying to index_types. - If
layer_typesis an empty list or shorter thanlayer_id, accessing_types[layer_id]will raise anIndexError.
To make the code more robust, I suggest guarding the access to _types and ensuring it's always a list.
| _rates = getattr(config, "compress_rates", {}) or {} | |
| _types = getattr(config, "layer_types", []) | |
| self.compress_ratio = max(1, _rates.get(_types[layer_id], 0)) | |
| _rates = getattr(config, "compress_rates", None) or {} | |
| _types = getattr(config, "layer_types", None) or [] | |
| layer_type = _types[layer_id] if layer_id < len(_types) else None | |
| self.compress_ratio = max(1, _rates.get(layer_type, 0)) |
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@claude review this |
…yer_types config.layer_types explicitly set to None made getattr(...,[]) return None (TypeError on subscript); a list shorter than layer_id raised IndexError. Coerce missing/None to [] and bounds-check the index, falling back to compress_ratio=1 when the layer type is unknown. Signed-off-by: Hannu Varjoranta <hannu@varjosoft.com>
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Suggested fix for #42741.
transformers >= 4.57normalizes the legacycompress_ratiosconfig field into thecompress_rates+layer_typespair, soDeepseekV4Attentionreadingconfig.compress_ratios[layer_id]raises and DeepSeek V4 fails to load on current transformers.This guards the access with
hasattr/is not Noneand falls back to the normalizedcompress_rates/layer_typesrepresentation when the legacy field is absent. Behavior is unchanged for checkpoints/transformers versions that still exposecompress_ratios. Full repro and environment details are in #42741.Closes #42741