123 lines
4.4 KiB
Python
123 lines
4.4 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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from abc import ABC, abstractmethod
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from typing import Any
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import torch
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from torch import nn
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from fastvideo.v1.configs.models import DiTConfig
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from fastvideo.v1.platforms import _Backend
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# TODO
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class BaseDiT(nn.Module, ABC):
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_fsdp_shard_conditions: list = []
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_compile_conditions: list = []
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_param_names_mapping: dict
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hidden_size: int
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num_attention_heads: int
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num_channels_latents: int
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# always supports torch_sdpa
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_supported_attention_backends: tuple[
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_Backend, ...] = DiTConfig()._supported_attention_backends
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def __init_subclass__(cls) -> None:
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required_class_attrs = [
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"_fsdp_shard_conditions", "_param_names_mapping",
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"_compile_conditions"
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]
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super().__init_subclass__()
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for attr in required_class_attrs:
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if not hasattr(cls, attr):
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raise AttributeError(
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f"Subclasses of BaseDiT must define '{attr}' class variable"
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)
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def __init__(self, config: DiTConfig, **kwargs) -> None:
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super().__init__()
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self.config = config
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if not self.supported_attention_backends:
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raise ValueError(
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f"Subclass {self.__class__.__name__} must define _supported_attention_backends"
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)
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@abstractmethod
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def forward(self,
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hidden_states: torch.Tensor,
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encoder_hidden_states: torch.Tensor | list[torch.Tensor],
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timestep: torch.LongTensor,
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encoder_hidden_states_image: torch.Tensor | list[torch.Tensor]
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| None = None,
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guidance=None,
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**kwargs) -> torch.Tensor:
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pass
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def __post_init__(self) -> None:
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required_attrs = [
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"hidden_size", "num_attention_heads", "num_channels_latents"
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]
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for attr in required_attrs:
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if not hasattr(self, attr):
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raise AttributeError(
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f"Subclasses of BaseDiT must define '{attr}' instance variable"
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)
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@property
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def supported_attention_backends(self) -> tuple[_Backend, ...]:
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return self._supported_attention_backends
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class CachableDiT(BaseDiT):
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"""
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An intermediate base class that adds TeaCache optimization functionality to DiT models.
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TeaCache accelerates inference by selectively skipping redundant computation when consecutive
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diffusion steps are similar enough.
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"""
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# These are required class attributes that should be overridden by concrete implementations
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_fsdp_shard_conditions = []
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_param_names_mapping = {}
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# Ensure these instance attributes are properly defined in subclasses
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hidden_size: int
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num_attention_heads: int
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num_channels_latents: int
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# always supports torch_sdpa
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_supported_attention_backends: tuple[
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_Backend, ...] = DiTConfig()._supported_attention_backends
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def __init__(self, config: DiTConfig, **kwargs) -> None:
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super().__init__(config, **kwargs)
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self.cnt = 0
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self.teacache_thresh = 0
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self.coefficients: list[float] = []
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# NOTE(will): Only wan2.1 needs these, so we are hardcoding it here
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if self.config.prefix == "wan":
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self.use_ret_steps = self.config.cache_config.use_ret_steps
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self.is_even = False
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self.previous_residual_even: torch.Tensor | None = None
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self.previous_residual_odd: torch.Tensor | None = None
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self.accumulated_rel_l1_distance_even = 0
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self.accumulated_rel_l1_distance_odd = 0
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self.should_calc_even = True
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self.should_calc_odd = True
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else:
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self.accumulated_rel_l1_distance = 0
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self.previous_modulated_input = None
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self.previous_resiual = None
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self.previous_e0_even: torch.Tensor | None = None
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self.previous_e0_odd: torch.Tensor | None = None
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def maybe_cache_states(self, hidden_states: torch.Tensor,
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original_hidden_states: torch.Tensor) -> None:
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pass
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def should_skip_forward_for_cached_states(self,
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**kwargs: dict[str, Any]) -> bool:
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return False
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def retrieve_cached_states(self,
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hidden_states: torch.Tensor) -> torch.Tensor:
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raise NotImplementedError(
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"maybe_retrieve_cached_states is not implemented")
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