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LTX-2.5: tensor- and sequence-parallel DiT and the two-stage distilled recipe - #376

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NSagan271 merged 28 commits into

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model/ltx2-5-two-stage

Oct 30, 2026

Merged

LTX-2.5: tensor- and sequence-parallel DiT and the two-stage distilled recipe#376
NSagan271 merged 28 commits into
mainfrom
model/ltx2-5-two-stage

Commits on Oct 28, 2026
- LTX-2.5: tensor-parallel DiT and the two-stage distilled recipe
  
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- LTX-2.5: encode the mp4 at CRF 18 with the ultrafast preset
  
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- Ragged attention: a resource can declare its workspace size
  
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- LTX-2.5: Ulysses sequence parallelism for the DiT
  
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- Sequence parallel: keep the exchange's layout changes in the compiled graph
  
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- LTX-2.5: encode the mp4 from contiguous frames
  
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- LTX-2.5: compile the video VAE decoder for the served shapes
  
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- LTX-2.5: the video self-attention through the shared Ulysses exchange
  
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- LTX-2.5 bench: an SGLang diffusion backend
  
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- LTX-2.5: hand the compiled VAE decoder the warm-up's strides at batch 1
  
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- Docs: RaggedAttentionConfig's shard_over_sp and workspace_mb
  
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- LTX-2.5 parity: run the latent upsampler node in the two-stage check
  
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- Sequence parallel: the log-sum-exp merge over sharded keys is a shared component
  
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- Ragged attention: return the log-sum-exp on request
  
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- LTX-2.5 SP: the audio-over-video merge attends through the ragged resource
  
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- LTX-2.5: warm the compiled video decoder for its own shapes
  
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- LTX-2.5: stage the refine walk's noise through stage_seed
  
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- LTX-2.5: the refine walks replay the single-stage capture; drop capture_refine_shapes
  
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- Diffusion attention: compute SDPA's log-sum-exp explicitly, not through a private aten kernel
  
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- LTX-2.5: validate vae_compile_shapes, skip the wrapper with nothing to warm, correct ltx2_5.yaml's comment
  
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- LTX-2.5 SP test: rendezvous through a file store, not a freed port
  
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- LTX-2.5: the latent upsampler batches up to the model's max_batch_size
  
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- Diffusion attention: RaggedAttentionFn is a Protocol, not Callable[...]
  
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- docs: request facts in step metadata go under their own key
  
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- Pin flashinfer-python 0.7.2
  
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- Sequence parallel: one gather for the merge over sharded keys
  
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- LTX-2.5: the upsampler reads the latent statistics from the checkpoints
  
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Commits on Oct 30, 2026
- Merge main into model/ltx2-5-two-stage
  
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Commits

Commits on Oct 28, 2026

Commits on Oct 30, 2026