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allow registration of custom checkpoint conversion mappings #42634

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allow registration of custom checkpoint conversion mappings #42634

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14 changes: 13 additions & 1 deletion src/transformers/conversion_mapping.py
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Original file line number Diff line number Diff line change
Expand Up @@ -186,10 +186,22 @@ def _build_checkpoint_conversion_mapping():

def get_checkpoint_conversion_mapping(model_type):
global _checkpoint_conversion_mapping_cache
_checkpoint_conversion_mapping_cache = _build_checkpoint_conversion_mapping()
if _checkpoint_conversion_mapping_cache is None:
_checkpoint_conversion_mapping_cache = _build_checkpoint_conversion_mapping()
return deepcopy(_checkpoint_conversion_mapping_cache.get(model_type))


def register_checkpoint_conversion_mapping(
model_type: str, mapping: list[WeightConverter | WeightRenaming], overwrite: bool = False
) -> None:
global _checkpoint_conversion_mapping_cache
if _checkpoint_conversion_mapping_cache is None:
_checkpoint_conversion_mapping_cache = _build_checkpoint_conversion_mapping()
if model_type in _checkpoint_conversion_mapping_cache and not overwrite:
raise ValueError(f"Model type {model_type} already exists in the checkpoint conversion mapping.")
_checkpoint_conversion_mapping_cache[model_type] = mapping


# DO NOT MODIFY, KEPT FOR BC ONLY
VLMS = [
"aria",
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