fastvideo.v1.attention.selector

Module Contents

Functions

backend_name_to_enum	Convert a string backend name to a _Backend enum value.
get_attn_backend
get_env_variable_attn_backend	Get the backend override specified by the FastVideo attention backend environment variable, if one is specified.
get_global_forced_attn_backend	Get the currently-forced choice of attention backend, or None if auto-selection is currently enabled.
global_force_attn_backend	Force all attention operations to use a specified backend.
global_force_attn_backend_context_manager	Globally force a FastVideo attention backend override within a context manager, reverting the global attention backend override to its prior state upon exiting the context manager.

Data

forced_attn_backend
logger

API

fastvideo.v1.attention.selector.backend_name_to_enum(backend_name: str) → fastvideo.v1.platforms.AttentionBackendEnum | None

Convert a string backend name to a _Backend enum value.

Returns:

• _Backend: enum value if backend_name is a valid in-tree type

• None: otherwise it’s an invalid in-tree type or an out-of-tree platform is loaded.

fastvideo.v1.attention.selector.forced_attn_backend: fastvideo.v1.platforms.AttentionBackendEnum | None

None

fastvideo.v1.attention.selector.get_attn_backend(head_size: int, dtype: torch.dtype, supported_attention_backends: tuple[fastvideo.v1.platforms.AttentionBackendEnum, ...] | None = None) → type[fastvideo.v1.attention.backends.abstract.AttentionBackend]

fastvideo.v1.attention.selector.get_env_variable_attn_backend() → fastvideo.v1.platforms.AttentionBackendEnum | None

Get the backend override specified by the FastVideo attention backend environment variable, if one is specified.

Returns:

• _Backend enum value if an override is specified

• None otherwise

fastvideo.v1.attention.selector.get_global_forced_attn_backend() → fastvideo.v1.platforms.AttentionBackendEnum | None

Get the currently-forced choice of attention backend, or None if auto-selection is currently enabled.

fastvideo.v1.attention.selector.global_force_attn_backend(attn_backend: fastvideo.v1.platforms.AttentionBackendEnum | None) → None

Force all attention operations to use a specified backend.

Passing None for the argument re-enables automatic backend selection.,

Arguments:

• attn_backend: backend selection (None to revert to auto)

fastvideo.v1.attention.selector.global_force_attn_backend_context_manager(attn_backend: fastvideo.v1.platforms.AttentionBackendEnum) → collections.abc.Generator[None, None, None]

Globally force a FastVideo attention backend override within a context manager, reverting the global attention backend override to its prior state upon exiting the context manager.

Arguments:

• attn_backend: attention backend to force

Returns:

• Generator

fastvideo.v1.attention.selector.logger

‘init_logger(…)’