github-actions[bot]
356 lines
15 KiB
YAML
356 lines
15 KiB
YAML
# =============================================================================
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# LTX-2 Video Backward Extension (Suffix) LoRA Training Configuration
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# =============================================================================
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#
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# This configuration is for training LoRA adapters on the LTX-2 model for
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# backward video extension. The model learns to generate video content that
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# leads into a given suffix of existing frames.
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#
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# Suffix conditioning works by providing the last N temporal units as clean
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# conditioning signals during training — they receive no noise, timestep=0,
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# and are excluded from the loss. The model learns to generate preceding
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# frames that seamlessly lead into the given suffix.
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#
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# Use this configuration when you want to:
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# - Train the model to generate "prequel" content for existing videos
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# - Fine-tune backward temporal continuation capabilities
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# - Create video backward extension models with optional audio
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#
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# Dataset structure:
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# preprocessed_data_root/
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# ├── latents/ # Video latents (VAE-encoded videos)
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# ├── conditions/ # Text embeddings for each video
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# └── audio_latents/ # Audio latents (VAE-encoded audio)
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#
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# =============================================================================
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# -----------------------------------------------------------------------------
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# Model Configuration
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# -----------------------------------------------------------------------------
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# Specifies the base model to fine-tune and the training mode.
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model:
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# Path to the LTX-2 model checkpoint (.safetensors file)
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# This should be a local path to your downloaded model
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model_path: "path/to/ltx-2-model.safetensors"
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# Path to the text encoder model directory
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# For LTX-2, this is typically the Gemma-based text encoder
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text_encoder_path: "path/to/gemma-text-encoder"
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# Training mode: "lora" for efficient adapter training, "full" for full fine-tuning
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# LoRA is recommended for most use cases (faster, less memory, prevents overfitting)
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training_mode: "lora"
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# Optional: Path to resume training from a checkpoint
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# Can be a checkpoint file (.safetensors) or directory (uses latest checkpoint)
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load_checkpoint: null
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# -----------------------------------------------------------------------------
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# LoRA Configuration
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# -----------------------------------------------------------------------------
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# Controls the Low-Rank Adaptation parameters for efficient fine-tuning.
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lora:
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# Rank of the LoRA matrices (higher = more capacity but more parameters)
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# Typical values: 8, 16, 32, 64. Start with 32 for general fine-tuning.
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rank: 32
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# Alpha scaling factor (usually set equal to rank)
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# The effective scaling is alpha/rank, so alpha=rank means scaling of 1.0
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alpha: 32
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# Dropout probability for LoRA layers (0.0 = no dropout)
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# Can help with regularization if overfitting occurs
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dropout: 0.0
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# Which transformer modules to apply LoRA to
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# The LTX-2 transformer has separate attention and FFN blocks for video and audio:
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#
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# VIDEO MODULES:
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# - attn1.to_k, attn1.to_q, attn1.to_v, attn1.to_out.0 (video self-attention)
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# - attn2.to_k, attn2.to_q, attn2.to_v, attn2.to_out.0 (video cross-attention to text)
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# - ff.net.0.proj, ff.net.2 (video feed-forward)
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#
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# AUDIO MODULES:
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# - audio_attn1.to_k, audio_attn1.to_q, audio_attn1.to_v, audio_attn1.to_out.0 (audio self-attention)
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# - audio_attn2.to_k, audio_attn2.to_q, audio_attn2.to_v, audio_attn2.to_out.0 (audio cross-attention to text)
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# - audio_ff.net.0.proj, audio_ff.net.2 (audio feed-forward)
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#
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# AUDIO-VIDEO CROSS-ATTENTION MODULES (for cross-modal interaction):
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# - audio_to_video_attn.to_k, audio_to_video_attn.to_q, audio_to_video_attn.to_v, audio_to_video_attn.to_out.0
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# (Q from video, K/V from audio - allows video to attend to audio features)
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# - video_to_audio_attn.to_k, video_to_audio_attn.to_q, video_to_audio_attn.to_v, video_to_audio_attn.to_out.0
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# (Q from audio, K/V from video - allows audio to attend to video features)
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#
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# Using short patterns like "to_k" matches ALL attention modules (video, audio, and cross-modal).
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# For audio-video training, this is the recommended approach.
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target_modules:
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# Attention layers (matches both video and audio branches)
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- "to_k"
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- "to_q"
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- "to_v"
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- "to_out.0"
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# Uncomment below to also train feed-forward layers (can increase the LoRA's capacity):
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# - "ff.net.0.proj"
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# - "ff.net.2"
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# - "audio_ff.net.0.proj"
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# - "audio_ff.net.2"
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# -----------------------------------------------------------------------------
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# Training Strategy Configuration
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# -----------------------------------------------------------------------------
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# Defines the backward video extension training approach using the unified
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# flexible strategy. Suffix conditioning provides the last N latent frames as
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# clean conditioning, teaching the model to generate content leading into them.
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training_strategy:
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# Strategy name: "flexible" for the unified conditioning framework
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# Supports all training modes (T2V, I2V, V2V, A2V, V2A, etc.) through
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# modality-specific configuration blocks.
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name: "flexible"
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# Video modality configuration
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video:
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# Whether the model generates video (true) or uses it as frozen conditioning (false)
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is_generated: true
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# Directory name (within preprocessed_data_root) containing video latents
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latents_dir: "latents"
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# Conditions applied to the video modality during training
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# Suffix conditioning: the last N temporal units are provided as clean
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# conditioning signals (no noise, timestep=0, excluded from loss)
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conditions:
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- type: suffix
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# Number of latent frames to use as conditioning suffix
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# For suffix conditioning, N latent frames correspond to N * 8 pixel frames.
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# temporal_boundary=8 means the last 64 pixel frames are used as suffix.
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temporal_boundary: 8
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# Probability of applying suffix conditioning per training sample
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# At 1.0, all training samples use backward extension mode
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probability: 1.0
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# Audio modality configuration
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audio:
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# Whether the model generates audio (true) or uses it as frozen conditioning (false)
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is_generated: true
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# Directory name (within preprocessed_data_root) containing audio latents
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latents_dir: "audio_latents"
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# -----------------------------------------------------------------------------
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# Optimization Configuration
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# -----------------------------------------------------------------------------
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# Controls the training optimization parameters.
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optimization:
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# Learning rate for the optimizer
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# Typical range for LoRA: 1e-5 to 1e-4
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learning_rate: 1e-4
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# Total number of training steps
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steps: 2000
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# Batch size per GPU
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# Reduce if running out of memory
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batch_size: 1
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# Number of gradient accumulation steps
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# Effective batch size = batch_size * gradient_accumulation_steps * num_gpus
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gradient_accumulation_steps: 1
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# Maximum gradient norm for clipping (helps training stability)
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max_grad_norm: 1.0
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# Optimizer type: "adamw" (standard) or "adamw8bit" (memory-efficient)
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optimizer_type: "adamw"
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# Learning rate scheduler type
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# Options: "constant", "linear", "cosine", "cosine_with_restarts", "polynomial"
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scheduler_type: "linear"
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# Additional scheduler parameters (depends on scheduler_type)
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scheduler_params: { }
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# Enable gradient checkpointing to reduce memory usage
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# Recommended for training with limited GPU memory
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enable_gradient_checkpointing: true
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# -----------------------------------------------------------------------------
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# Acceleration Configuration
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# -----------------------------------------------------------------------------
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# Hardware acceleration and memory optimization settings.
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acceleration:
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# Mixed precision training mode
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# Options: "no" (fp32), "fp16" (half precision), "bf16" (bfloat16, recommended)
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mixed_precision_mode: "bf16"
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# Model quantization for reduced memory usage
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# Options: null (none), "int8-quanto", "int4-quanto", "int2-quanto", "fp8-quanto", "fp8uz-quanto"
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quantization: null
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# Load text encoder in 8-bit precision to save memory
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# Useful when GPU memory is limited
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load_text_encoder_in_8bit: false
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# Offload optimizer state to CPU during validation video sampling and restore it after.
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# Frees VRAM for the VAE decoder when optimizer state is large (full fine-tune, high-rank
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# LoRA). No effect under FSDP (sharded state).
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offload_optimizer_during_validation: false
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# -----------------------------------------------------------------------------
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# Data Configuration
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# -----------------------------------------------------------------------------
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# Specifies the training data location and loading parameters.
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data:
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# Root directory containing preprocessed training data
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# Should contain: latents/, conditions/, and audio_latents/
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preprocessed_data_root: "/path/to/preprocessed/data"
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# Number of worker processes for data loading
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# Used for parallel data loading to speed up data loading
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num_dataloader_workers: 2
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# -----------------------------------------------------------------------------
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# Validation Configuration
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# -----------------------------------------------------------------------------
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# Controls validation sampling during training.
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# NOTE: Validation sampling use simplified inference pipelines and prioritizes speed over
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# maximum quality. For production-quality inference, use `packages/ltx-pipelines`.
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validation:
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# Validation samples — each sample describes a self-contained generation request.
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# Use 'conditions' to add conditioning (first_frame, prefix, suffix, reference, video_to_audio, etc.)
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# See docs/configuration-reference.md#validation-condition-types for the full list of condition types.
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samples:
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- prompt: >-
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A woman with long brown hair sits at a wooden desk in a cozy home office, typing on a
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laptop while occasionally glancing at notes beside her. Soft natural light streams through
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a large window, casting warm shadows across the room. She pauses to take a sip from a
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ceramic mug, then continues working with focused concentration. The audio captures the
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gentle clicking of keyboard keys, the soft rustle of papers, and ambient room tone with
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occasional distant bird chirps from outside.
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conditions:
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- type: suffix
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video: "/path/to/suffix_video_1.mp4"
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# Matches temporal_boundary=8 during training: 8 * 8 = 64 frames
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num_frames: 64
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- prompt: >-
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A chef in a white uniform stands in a professional kitchen, carefully plating a gourmet
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dish with precise movements. Steam rises from freshly cooked vegetables as he arranges
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them with tweezers. The stainless steel surfaces gleam under bright overhead lights, and
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various pots simmer on the stove behind him. The audio features the sizzling of pans,
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the clinking of utensils against plates, and the ambient hum of kitchen ventilation.
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conditions:
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- type: suffix
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video: "/path/to/suffix_video_2.mp4"
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# Matches temporal_boundary=8 during training: 8 * 8 = 64 frames
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num_frames: 64
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# Negative prompt to avoid unwanted artifacts
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negative_prompt: "worst quality, inconsistent motion, blurry, jittery, distorted"
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# Output video dimensions [width, height, frames]
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# Width and height must be divisible by 32
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# Frames must satisfy: frames % 8 == 1 (e.g., 1, 9, 17, 25, 33, 41, 49, 57, 65, 73, 81, 89, ...)
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video_dims: [ 576, 576, 89 ]
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# Frame rate for generated videos
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frame_rate: 25.0
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# Random seed for reproducible validation outputs
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seed: 42
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# Number of denoising steps for validation inference
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# Higher values = better quality but slower generation
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inference_steps: 30
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# Generate validation videos every N training steps
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# Set to null to disable validation during training
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interval: 100
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# Classifier-free guidance scale
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# Higher values = stronger adherence to prompt but may introduce artifacts
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guidance_scale: 4.0
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# STG (Spatio-Temporal Guidance) parameters for improved video quality
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# STG is combined with CFG for better temporal coherence
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stg_scale: 1.0 # Recommended: 1.0 (0.0 disables STG)
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stg_blocks: [29] # Recommended: single block 29
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stg_mode: "stg_av" # "stg_av" perturbs both audio and video, "stg_v" video only
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# Whether to generate audio in validation samples
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# Independent of training_strategy.audio.is_generated - you can generate audio
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# in validation even when not training the audio branch
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generate_audio: true
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# Skip validation at the beginning of training (step 0)
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skip_initial_validation: false
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# -----------------------------------------------------------------------------
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# Checkpoint Configuration
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# -----------------------------------------------------------------------------
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# Controls model checkpoint saving during training.
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checkpoints:
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# Save a checkpoint every N steps
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# Set to null to disable intermediate checkpoints
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interval: 250
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# Number of most recent checkpoints to keep
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# Set to -1 to keep all checkpoints
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keep_last_n: -1
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# Precision to use when saving checkpoint weights
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# Options: "bfloat16" (default, smaller files) or "float32" (full precision)
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precision: "bfloat16"
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# -----------------------------------------------------------------------------
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# Flow Matching Configuration
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# -----------------------------------------------------------------------------
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# Parameters for the flow matching training objective.
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flow_matching:
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# Timestep sampling mode
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# "shifted_logit_normal" is recommended for LTX-2 models
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timestep_sampling_mode: "shifted_logit_normal"
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# Additional parameters for timestep sampling
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timestep_sampling_params: { }
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# -----------------------------------------------------------------------------
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# Hugging Face Hub Configuration
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# -----------------------------------------------------------------------------
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# Settings for uploading trained models to the Hugging Face Hub.
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hub:
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# Whether to push the trained model to the Hub
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push_to_hub: false
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# Repository ID on Hugging Face Hub (e.g., "username/my-lora-model")
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# Required if push_to_hub is true
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hub_model_id: null
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# -----------------------------------------------------------------------------
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# Weights & Biases Configuration
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# -----------------------------------------------------------------------------
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# Settings for experiment tracking with W&B.
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wandb:
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# Enable W&B logging
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enabled: false
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# W&B project name
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project: "ltx-2-trainer"
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# W&B username or team (null uses default account)
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entity: null
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# Tags to help organize runs
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tags: [ "ltx2", "lora", "video-suffix", "backward-extension" ]
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# Log validation media (video/audio) to W&B
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log_validation_videos: true
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# -----------------------------------------------------------------------------
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# General Configuration
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# -----------------------------------------------------------------------------
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# Global settings for the training run.
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# Random seed for reproducibility
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seed: 42
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# Directory to save outputs (checkpoints, validation videos, logs)
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output_dir: "outputs/video_suffix_lora"
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