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hyworld

Modules

fastvideo.pipelines.basic.hyworld.hyworld_pipeline

HYWorld video diffusion pipeline implementation.

This module contains an implementation of the HYWorld video diffusion pipeline using the modular pipeline architecture with HYWorld-specific denoising stage for chunk-based video generation with context frame selection.

Classes

fastvideo.pipelines.basic.hyworld.hyworld_pipeline.HYWorldPipeline 
HYWorldPipeline(model_path: str, fastvideo_args: FastVideoArgs | TrainingArgs, required_config_modules: list[str] | None = None, loaded_modules: dict[str, Module] | None = None)

Bases: ComposedPipelineBase

HYWorld video diffusion pipeline.

This pipeline implements chunk-based video generation with context frame selection for 3D-aware generation using HYWorldDenoisingStage.

Note: HYWorld only uses a single LLM-based text encoder, unlike SDXL-style dual encoder setups. The text_encoder_2/tokenizer_2 are not used.

Source code in fastvideo/pipelines/composed_pipeline_base.py 
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def __init__(self,
             model_path: str,
             fastvideo_args: FastVideoArgs | TrainingArgs,
             required_config_modules: list[str] | None = None,
             loaded_modules: dict[str, torch.nn.Module] | None = None):
    """
    Initialize the pipeline. After __init__, the pipeline should be ready to
    use. The pipeline should be stateless and not hold any batch state.
    """
    self.fastvideo_args = fastvideo_args

    self.model_path: str = model_path
    self._stages: list[PipelineStage] = []
    self._stage_name_mapping: dict[str, PipelineStage] = {}

    if required_config_modules is not None:
        self._required_config_modules = required_config_modules

    if self._required_config_modules is None:
        raise NotImplementedError(
            "Subclass must set _required_config_modules")

    maybe_init_distributed_environment_and_model_parallel(
        fastvideo_args.tp_size, fastvideo_args.sp_size)

    # Torch profiler. Enabled and configured through env vars:
    # FASTVIDEO_TORCH_PROFILER_DIR=/path/to/save/trace
    trace_dir = envs.FASTVIDEO_TORCH_PROFILER_DIR
    self.profiler_controller = get_or_create_profiler(trace_dir)
    self.profiler = self.profiler_controller.profiler

    self.local_rank = get_world_group().local_rank

    # Load modules directly in initialization
    logger.info("Loading pipeline modules...")
    with self.profiler_controller.region("profiler_region_model_loading"):
        self.modules = self.load_modules(fastvideo_args, loaded_modules)
Functions
fastvideo.pipelines.basic.hyworld.hyworld_pipeline.HYWorldPipeline.create_pipeline_stages 
create_pipeline_stages(fastvideo_args: FastVideoArgs)

Set up pipeline stages with HYWorld-specific denoising stage.

Source code in fastvideo/pipelines/basic/hyworld/hyworld_pipeline.py 
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def create_pipeline_stages(self, fastvideo_args: FastVideoArgs):
    """Set up pipeline stages with HYWorld-specific denoising stage."""

    self.add_stage(stage_name="input_validation_stage",
                   stage=InputValidationStage())

    self.add_stage(stage_name="prompt_encoding_stage_primary",
                   stage=TextEncodingStage(
                       text_encoders=[
                           self.get_module("text_encoder"),
                           self.get_module("text_encoder_2")
                       ],
                       tokenizers=[
                           self.get_module("tokenizer"),
                           self.get_module("tokenizer_2")
                       ]))

    self.add_stage(stage_name="conditioning_stage",
                   stage=ConditioningStage())

    self.add_stage(stage_name="timestep_preparation_stage",
                   stage=TimestepPreparationStage(
                       scheduler=self.get_module("scheduler")))

    self.add_stage(stage_name="latent_preparation_stage",
                   stage=LatentPreparationStage(
                       scheduler=self.get_module("scheduler"),
                       transformer=self.get_module("transformer")))

    self.add_stage(stage_name="image_encoding_stage",
                   stage=HYWorldImageEncodingStage(
                       image_encoder=self.get_module("image_encoder"),
                       image_processor=self.get_module("feature_extractor"),
                       vae=self.get_module("vae")))

    self.add_stage(stage_name="denoising_stage",
                   stage=HYWorldDenoisingStage(
                       transformer=self.get_module("transformer"),
                       scheduler=self.get_module("scheduler"),
                       pipeline=self))

    self.add_stage(stage_name="decoding_stage",
                   stage=DecodingStage(vae=self.get_module("vae")))

Functions