mirror of
https://github.com/comfyanonymous/ComfyUI.git
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118 lines
3.9 KiB
Python
118 lines
3.9 KiB
Python
from abc import ABC, abstractmethod
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from typing import Tuple
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import torch
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from einops import rearrange
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from torch import Tensor
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def latent_to_pixel_coords(
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latent_coords: Tensor, scale_factors: Tuple[int, int, int], causal_fix: bool = False
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) -> Tensor:
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"""
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Converts latent coordinates to pixel coordinates by scaling them according to the VAE's
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configuration.
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Args:
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latent_coords (Tensor): A tensor of shape [batch_size, 3, num_latents]
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containing the latent corner coordinates of each token.
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scale_factors (Tuple[int, int, int]): The scale factors of the VAE's latent space.
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causal_fix (bool): Whether to take into account the different temporal scale
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of the first frame. Default = False for backwards compatibility.
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Returns:
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Tensor: A tensor of pixel coordinates corresponding to the input latent coordinates.
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"""
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pixel_coords = (
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latent_coords
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* torch.tensor(scale_factors, device=latent_coords.device)[None, :, None]
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)
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if causal_fix:
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# Fix temporal scale for first frame to 1 due to causality
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pixel_coords[:, 0] = (pixel_coords[:, 0] + 1 - scale_factors[0]).clamp(min=0)
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return pixel_coords
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class Patchifier(ABC):
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def __init__(self, patch_size: int):
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super().__init__()
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self._patch_size = (1, patch_size, patch_size)
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@abstractmethod
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def patchify(
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self, latents: Tensor, frame_rates: Tensor, scale_grid: bool
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) -> Tuple[Tensor, Tensor]:
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pass
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@abstractmethod
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def unpatchify(
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self,
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latents: Tensor,
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output_height: int,
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output_width: int,
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output_num_frames: int,
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out_channels: int,
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) -> Tuple[Tensor, Tensor]:
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pass
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@property
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def patch_size(self):
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return self._patch_size
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def get_latent_coords(
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self, latent_num_frames, latent_height, latent_width, batch_size, device
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):
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"""
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Return a tensor of shape [batch_size, 3, num_patches] containing the
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top-left corner latent coordinates of each latent patch.
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The tensor is repeated for each batch element.
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"""
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latent_sample_coords = torch.meshgrid(
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torch.arange(0, latent_num_frames, self._patch_size[0], device=device),
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torch.arange(0, latent_height, self._patch_size[1], device=device),
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torch.arange(0, latent_width, self._patch_size[2], device=device),
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indexing="ij",
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)
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latent_sample_coords = torch.stack(latent_sample_coords, dim=0)
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latent_coords = latent_sample_coords.unsqueeze(0).repeat(batch_size, 1, 1, 1, 1)
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latent_coords = rearrange(
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latent_coords, "b c f h w -> b c (f h w)", b=batch_size
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)
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return latent_coords
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class SymmetricPatchifier(Patchifier):
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def patchify(
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self,
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latents: Tensor,
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) -> Tuple[Tensor, Tensor]:
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b, _, f, h, w = latents.shape
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latent_coords = self.get_latent_coords(f, h, w, b, latents.device)
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latents = rearrange(
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latents,
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"b c (f p1) (h p2) (w p3) -> b (f h w) (c p1 p2 p3)",
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p1=self._patch_size[0],
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p2=self._patch_size[1],
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p3=self._patch_size[2],
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)
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return latents, latent_coords
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def unpatchify(
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self,
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latents: Tensor,
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output_height: int,
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output_width: int,
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output_num_frames: int,
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out_channels: int,
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) -> Tuple[Tensor, Tensor]:
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output_height = output_height // self._patch_size[1]
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output_width = output_width // self._patch_size[2]
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latents = rearrange(
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latents,
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"b (f h w) (c p q) -> b c f (h p) (w q) ",
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f=output_num_frames,
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h=output_height,
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w=output_width,
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p=self._patch_size[1],
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q=self._patch_size[2],
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)
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return latents
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