[LTX-2] add Flax/JAX implementation of LTX-2 Latent Upsampler#366
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[LTX-2] add Flax/JAX implementation of LTX-2 Latent Upsampler#366
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Would be better to add unit test associated with upsampler. |
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Added unit test. thanks for suggestion. |
entrpn
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Mar 27, 2026
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LGTM! I think the checkpointer test is failing as this PR introduces some changes for supporting |
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@entrpn @Perseus14 PTAL |
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This PR introduces support for the LTX-2 Latent Upsampler, enabling higher resolution and higher quality video generation directly within the latent space prior to VAE decoding.
Key Changes
latent_upsampler_ltx2.py): Added a native Flax/JAX implementation of theLTX2LatentUpsamplerModel, including spatial/temporal rational resampling, pixel shuffle, and blur downsampling.ltx2_utils.py): Added utilities to load, convert, and correctly transpose PyTorch upsampler weights to Flax/JAX format.ltx2_pipeline.py): Integrated the upsampler step directly into the mainLTX2Pipeline. Whenrun_latent_upsampler=True, latents are upsampled, Adaptive Instance Normalized (AdaIN), and tone-mapped before decoding.pipeline_ltx2_latent_upsample.py): Added a dedicatedFlaxLTX2LatentUpsamplePipelinefor cases where users want to run the upsampler on existing latents independently of the main generation loop.ltx2_video.ymlandgenerate_ltx2.pywith necessary configuration flags to toggle and tune the upsampler (upsampler_adain_factor,upsampler_tone_map_compression_ratio, etc.).