Patch release v5.20.2

发生了什么

Patch release: v5.20.2 This patch notably solves an issue where some inputs could loose their original type inside prepare_inputs_for_generation in generate , leading to problems with multimodal models. It also fixes some other issues listed on the below commits. It contains the following commits: Fix inputs dict casting in generate ( #49731 ) by @Cyrilvallez Fix zero expert gradients in bfloat16 with expert paralle…

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