Pass attn_implementation when using AutoXXX.from_config #30507
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younesbelkada
approved these changes
Apr 27, 2024
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What does this PR do?
Passes
attn_implementation=config._attn_implementationwhen creating a model usingAutoXxx.from_config. This ensures the attention implementation selected is complementary with the parent model.Not added for some models, as the default attn implementation selected for the model isn't compatible with the component model c.f. a57b9b5
If this is not passed, then breaking changes can occur when the attention implementation in the component model being loaded changes -- see #30506 for an example of breaking changes.
For example, when SDPA was added to BERT, this attention mechanism was then selected by default. This however wasn't supported by other models using it as an encoder.