indigo
e03cc62548
Wire SCAIL-2 driving + in-context mask conditioning into the trainer via the unified FlexibleStrategy, so the widened patchify_proj (Phase 2) can be trained. - flexible.py: new DrivingConditionConfig (driving-latent concat with a RoPE width offset ΔW) and MaskChannelsConditionConfig (semantic masks -> per-token channels), added to the condition union and get_data_sources. Driving is prepended (cond-first, target stays at the tail for loss slicing); mask channels are written onto the driving tokens via Modality.cond_channels, reusing ltx-core encode_mask_channels. The noisy target keeps a zero mask. - model_loader.load_transformer gains mask_conditioning_channels, widening the video patchify_proj with zero-init columns via a new live-module helper (widen_module_patchify_proj_for_mask_channels). ModelConfig exposes the field. - trainer unfreezes patchify_proj in LoRA mode when mask channels are active (the new input columns are new base params LoRA cannot reach). - configs/scail_animation_lora.yaml plus README / training-modes table rows. Verified on CPU (verify_phase3_trainer.py): config round-trips, prepare_training _inputs builds cond_channels [B,T,56] with the mask on the driving tokens, a tiny widened model forwards and compute_loss returns a finite [B] loss, and the widen helper is output-preserving at zero init. Real training needs Linux+GPU+checkpoint; dataset preprocessing (driving latents + semantic masks) and validation-runner wiring are left for later. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Training Configs
Example training configurations for the LTX-2 trainer. Each file is a ready-to-run config for one training mode,
expressed through the unified flexible strategy (name: "flexible"). Pick the one closest to your use case and
adjust paths, dataset, and hyperparameters.
📖 For more information about using each training mode, see Training Modes Guide.
Training Modes
| Mode | Video | Audio | Conditions | Config |
|---|---|---|---|---|
| T2V | Generated | Generated | — | t2v_lora.yaml, t2v_lora_low_vram.yaml (low VRAM) |
| I2V | Generated | Generated | first_frame |
i2v_lora.yaml |
| Video Extension | Generated | Generated | prefix/suffix |
video_extend_lora.yaml (forward), video_suffix_lora.yaml (backward) |
| V2V IC-LoRA | Generated | — | reference |
v2v_ic_lora.yaml |
| A2V | Generated | Frozen | — | a2v_lora.yaml |
| V2A (Foley) | Frozen | Generated | — | v2a_lora.yaml |
| Video Inpainting | Generated | — | mask |
video_inpainting_lora.yaml |
| Video Outpainting | Generated | — | spatial_crop |
video_outpainting_lora.yaml |
| T2A | — | Generated | — | t2a_lora.yaml |
| Audio Extension | — | Generated | prefix/suffix |
audio_extend_lora.yaml (forward), audio_suffix_lora.yaml (backward) |
| Audio Inpainting | — | Generated | mask |
audio_inpainting_lora.yaml |
| A2A IC-LoRA | — | Generated | reference |
a2a_ic_lora.yaml |
| AV2AV IC-LoRA | Generated | Generated | reference (both) |
av2av_ic_lora.yaml |
| SCAIL Animation | Generated | — | driving + mask_channels |
scail_animation_lora.yaml |
The accelerate/ directory holds the Accelerate launch configs (FSDP, DDP) for multi-GPU training.
SCAIL Animation (SCAIL-2 character animation) also sets
model.mask_conditioning_channels: 56to widen the videopatchify_projfor the in-context mask channels; in LoRA mode that projection is unfrozen so the new columns train. See Training Modes Guide.