358 lines
13 KiB
Python
358 lines
13 KiB
Python
import torch
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import torch.nn as nn
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import comfy.ops
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from einops import rearrange, repeat
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from comfy.ldm.modules.attention import SpatialTransformer, BasicTransformerBlock
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from comfy.ldm.modules.diffusionmodules.openaimodel import TimestepBlock, Downsample, Upsample
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operations = comfy.ops.disable_weight_init
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ops = operations
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def zero_module(module):
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"""
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Zero out the parameters of a module and return it.
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"""
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for p in module.parameters():
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p.detach().zero_()
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return module
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def get_batch_size(b: int, use_cfg: True):
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return 2 if use_cfg else 1
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def use_attn_strength(strength):
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return 1.0 - strength > 0.0
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class TemporalConvBlock_v2(nn.Module):
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def __init__(self,
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in_dim,
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out_dim=None,
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dropout=0.0,
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device='cuda',
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dtype=torch.float16,
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ops=operations,
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temporal_conv_strength=1.0
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):
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super(TemporalConvBlock_v2, self).__init__()
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if out_dim is None:
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out_dim = in_dim # int(1.5*in_dim)
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self.in_dim = in_dim
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self.out_dim = out_dim
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self.temporal_conv_strength = temporal_conv_strength
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# conv layers
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self.conv1 = nn.Sequential(
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ops.GroupNorm(32, in_dim, dtype=dtype, device=device), nn.SiLU(),
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ops.Conv3d(in_dim, out_dim, (3, 1, 1), padding=(1, 0, 0), dtype=dtype, device=device))
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self.conv2 = nn.Sequential(
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ops.GroupNorm(32, out_dim, dtype=dtype, device=device), nn.SiLU(), nn.Dropout(dropout),
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ops.Conv3d(out_dim, in_dim, (3, 1, 1), padding=(1, 0, 0), dtype=dtype, device=device))
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self.conv3 = nn.Sequential(
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ops.GroupNorm(32, out_dim, dtype=dtype, device=device), nn.SiLU(), nn.Dropout(dropout),
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ops.Conv3d(out_dim, in_dim, (3, 1, 1), padding=(1, 0, 0), dtype=dtype, device=device))
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self.conv4 = nn.Sequential(
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ops.GroupNorm(32, out_dim, dtype=dtype, device=device), nn.SiLU(), nn.Dropout(dropout),
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ops.Conv3d(out_dim, in_dim, (3, 1, 1), padding=(1, 0, 0), dtype=dtype, device=device))
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# zero out the last layer params,so the conv block is identity
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nn.init.zeros_(self.conv4[-1].weight)
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nn.init.zeros_(self.conv4[-1].bias)
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def forward(self, x):
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identity = x
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x = self.conv1(x)
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x = self.conv2(x)
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x = self.conv3(x)
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x = self.conv4(x)
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if use_attn_strength(self.temporal_conv_strength):
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x = identity + (self.temporal_conv_strength * 0.1) * x
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else:
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x = identity + x
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return x
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class ResBlock(TimestepBlock):
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"""
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A residual block that can optionally change the number of channels.
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:param channels: the number of input channels.
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:param emb_channels: the number of timestep embedding channels.
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:param dropout: the rate of dropout.
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:param out_channels: if specified, the number of out channels.
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:param use_conv: if True and out_channels is specified, use a spatial
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convolution instead of a smaller 1x1 convolution to change the
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channels in the skip connection.
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:param dims: determines if the signal is 1D, 2D, or 3D.
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:param use_checkpoint: if True, use gradient checkpointing on this module.
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:param up: if True, use this block for upsampling.
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:param down: if True, use this block for downsampling.
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"""
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def __init__(
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self,
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channels,
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emb_channels,
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dropout,
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out_channels=None,
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use_conv=False,
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use_scale_shift_norm=False,
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dims=2,
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use_checkpoint=False,
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up=False,
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down=False,
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kernel_size=3,
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exchange_temb_dims=False,
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skip_t_emb=False,
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dtype=None,
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device=None,
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operations=ops,
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use_temporal_conv=True,
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temporal_conv_strength=1.0,
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):
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super().__init__()
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self.channels = channels
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self.emb_channels = emb_channels
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self.dropout = dropout
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self.out_channels = out_channels or channels
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self.use_conv = use_conv
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self.use_checkpoint = use_checkpoint
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self.use_scale_shift_norm = use_scale_shift_norm
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self.exchange_temb_dims = exchange_temb_dims
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self.use_temporal_conv = use_temporal_conv
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self.use_cfg = True
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if isinstance(kernel_size, list):
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padding = [k // 2 for k in kernel_size]
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else:
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padding = kernel_size // 2
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self.in_layers = nn.Sequential(
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operations.GroupNorm(32, channels, dtype=dtype, device=device),
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nn.SiLU(),
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operations.conv_nd(dims, channels, self.out_channels, 3, padding=1, dtype=dtype, device=device),
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)
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self.updown = up or down
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if up:
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self.h_upd = Upsample(channels, False, dims, dtype=dtype, device=device)
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self.x_upd = Upsample(channels, False, dims, dtype=dtype, device=device)
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elif down:
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self.h_upd = Downsample(channels, False, dims, dtype=dtype, device=device)
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self.x_upd = Downsample(channels, False, dims, dtype=dtype, device=device)
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else:
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self.h_upd = self.x_upd = nn.Identity()
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self.skip_t_emb = skip_t_emb
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if self.skip_t_emb:
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self.emb_layers = None
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self.exchange_temb_dims = False
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else:
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self.emb_layers = nn.Sequential(
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nn.SiLU(),
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operations.Linear(
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emb_channels,
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2 * self.out_channels if use_scale_shift_norm else self.out_channels, dtype=dtype, device=device
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),
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)
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self.out_layers = nn.Sequential(
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operations.GroupNorm(32, self.out_channels, dtype=dtype, device=device),
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nn.SiLU(),
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nn.Dropout(p=dropout),
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zero_module(operations.conv_nd(dims, self.out_channels, self.out_channels, 3, padding=1, dtype=dtype, device=device))
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)
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if self.out_channels == channels:
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self.skip_connection = nn.Identity()
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elif use_conv:
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self.skip_connection = operations.conv_nd(
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dims, channels, self.out_channels, 3, padding=1, dtype=dtype, device=device
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)
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else:
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self.skip_connection = operations.conv_nd(dims, channels, self.out_channels, 1, dtype=dtype, device=device)
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if use_temporal_conv:
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self.temopral_conv = TemporalConvBlock_v2(
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self.out_channels,
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self.out_channels,
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dropout=0.1,
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temporal_conv_strength=temporal_conv_strength
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)
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def forward(self, x, emb):
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"""
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Apply the block to a Tensor, conditioned on a timestep embedding.
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:param x: an [N x C x ...] Tensor of features.
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:param emb: an [N x emb_channels] Tensor of timestep embeddings.
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:return: an [N x C x ...] Tensor of outputs.
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"""
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return self._forward(x, emb)
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def _forward(self, x, emb):
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b = x.shape[0]
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if self.updown:
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in_rest, in_conv = self.in_layers[:-1], self.in_layers[-1]
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h = in_rest(x)
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h = self.h_upd(h)
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x = self.x_upd(x)
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h = in_conv(h)
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else:
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h = self.in_layers(x)
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emb_out = None
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if not self.skip_t_emb:
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emb_out = self.emb_layers(emb).type(h.dtype)
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while len(emb_out.shape) < len(h.shape):
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emb_out = emb_out[..., None]
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if self.use_scale_shift_norm:
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out_norm, out_rest = self.out_layers[0], self.out_layers[1:]
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h = out_norm(h)
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if emb_out is not None:
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scale, shift = th.chunk(emb_out, 2, dim=1)
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h *= (1 + scale)
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h += shift
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h = out_rest(h)
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else:
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if emb_out is not None:
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if self.exchange_temb_dims:
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emb_out = rearrange(emb_out, "b t c ... -> b c t ...")
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h = h + emb_out
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h = self.out_layers(h)
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h = self.skip_connection(x) + h
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if self.use_temporal_conv:
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batch_size = get_batch_size(b, self.use_cfg)
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h = rearrange(h, '(b f) c h w -> b c f h w', b=batch_size)
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h = self.temopral_conv(h)
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h = rearrange(h, 'b c f h w -> (b f) c h w')
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return h
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class TemporalTransformer(nn.Module): # nn.Module -> SpatialTransformer
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"""
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Transformer block for image-like data in temporal axis.
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First, reshape to b, t, d.
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Then apply standard transformer action.
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Finally, reshape to image
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"""
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def __init__(self,
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in_channels,
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n_heads,
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d_head,
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depth=1,
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dropout=0.0,
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context_dim=None,
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disable_self_attn=False,
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use_linear=False,
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use_checkpoint=True,
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only_self_att=True,
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multiply_zero=False,
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device='cuda',
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dtype=torch.float16,
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ops=operations,
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use_temporal_attention=True,
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temporal_attn_strength=1.0
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):
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super().__init__()
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self.multiply_zero = multiply_zero
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self.only_self_att = only_self_att
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self.use_temporal_attention = use_temporal_attention
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self.use_cfg = True
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self.temporal_attn_strength = temporal_attn_strength
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if self.only_self_att:
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context_dim = None
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if not isinstance(context_dim, list):
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context_dim = [context_dim]
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self.in_channels = in_channels
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inner_dim = n_heads * d_head
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self.norm = ops.GroupNorm(
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num_groups=32, num_channels=in_channels, eps=1e-6, affine=True, device=device, dtype=dtype)
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if not use_linear:
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self.proj_in = nn.Conv1d(
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in_channels, inner_dim, kernel_size=1, stride=1, padding=0, device=device, dtype=dtype)
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else:
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self.proj_in = ops.Linear(in_channels, inner_dim, device=device, dtype=dtype)
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self.transformer_blocks = nn.ModuleList([
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BasicTransformerBlock(
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inner_dim,
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n_heads,
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d_head,
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dropout=dropout,
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context_dim=context_dim[d],
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checkpoint=use_checkpoint,
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device=device,
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dtype=dtype
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) for d in range(depth)
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])
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if not use_linear:
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self.proj_out = zero_module(
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nn.Conv1d(
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inner_dim, in_channels, kernel_size=1, stride=1,
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padding=0)).to(dtype=dtype)
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else:
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self.proj_out = zero_module(ops.Linear(in_channels, inner_dim, device=device, dtype=dtype))
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self.use_linear = use_linear
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def forward(self, x, context=None):
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if not self.use_temporal_attention:
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return x
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# note: if no context is given, cross-attention defaults to self-attention
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if self.only_self_att:
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context = None
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if not isinstance(context, list):
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context = [context]
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x_in = x
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b = get_batch_size(x_in.shape[0], self.use_cfg)
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x = rearrange(x, '(b f) c h w -> b c f h w', b=b)
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b, c, f, h, w = x.shape
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x = self.norm(x)
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if not self.use_linear:
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x = rearrange(x, 'b c f h w -> (b h w) c f').contiguous()
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x = self.proj_in(x)
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if self.use_linear:
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x = rearrange(
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x, '(b f) c h w -> b (h w) f c', f=self.frames).contiguous()
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x = self.proj_in(x)
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if self.only_self_att:
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x = rearrange(x, 'bhw c f -> bhw f c').contiguous()
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for i, block in enumerate(self.transformer_blocks):
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x = block(x)
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x = rearrange(x, '(b hw) f c -> b hw f c', b=b).contiguous()
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else:
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x = rearrange(x, '(b hw) c f -> b hw f c', b=b).contiguous()
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for i, block in enumerate(self.transformer_blocks):
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context[i] = rearrange(
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context[i], '(b f) l con -> b f l con',
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f=self.frames).contiguous()
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# calculate each batch one by one (since number in shape could not greater then 65,535 for some package)
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for j in range(b):
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context_i_j = repeat(
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context[i][j],
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'f l con -> (f r) l con',
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r=(h * w) // self.frames,
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f=self.frames).contiguous()
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x[j] = block(x[j], context=context_i_j)
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if self.use_linear:
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x = self.proj_out(x)
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x = rearrange(x, 'b (h w) f c -> b f c h w', h=h, w=w).contiguous()
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if not self.use_linear:
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x = rearrange(x, 'b hw f c -> (b hw) c f').contiguous()
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x = self.proj_out(x)
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x = rearrange(
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x, '(b h w) c f -> b c f h w', b=b, h=h, w=w).contiguous()
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x = rearrange(x, 'b c f h w -> (b f) c h w')
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if use_attn_strength(self.temporal_attn_strength):
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x = (self.temporal_attn_strength * 0.1) * x + x_in
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else:
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x = x + x_in
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return x
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