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Teacache implemented into hunyuan video framepack transformer model#11949

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What does this PR do?

  • This PR adds TeaCache support to HunyuanVideoFramepackTransformer3DModel, improving inference latency.

TeaCache is opt-in and can be enabled with:

transformer = HunyuanVideoFramepackTransformer3DModel.from_pretrained(    "lllyasviel/FramePackI2V_HY", torch_dtype=torch.bfloat16)transformer.initialize_teacache()

What’s changed

  • Added TeaCache logic in the model’s forward method.
  • Introduced initialize_teacache() method.
  • Wrote an initialization test inside the existing test for Hunyuan FramePack.

@sayakpaul@yiyixuxu

Let me know the fixes required

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