self-forcing / demo_utils /vae_block3.py
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from typing import List
from einops import rearrange
import torch
import torch.nn as nn
from wan.modules.vae import AttentionBlock, CausalConv3d, RMS_norm, ResidualBlock, Upsample
class Resample(nn.Module):
def __init__(self, dim, mode):
assert mode in ('none', 'upsample2d', 'upsample3d', 'downsample2d',
'downsample3d')
super().__init__()
self.dim = dim
self.mode = mode
self.cache_t = 2
# layers
if mode == 'upsample2d':
self.resample = nn.Sequential(
Upsample(scale_factor=(2., 2.), mode='nearest'),
nn.Conv2d(dim, dim // 2, 3, padding=1))
elif mode == 'upsample3d':
self.resample = nn.Sequential(
Upsample(scale_factor=(2., 2.), mode='nearest'),
nn.Conv2d(dim, dim // 2, 3, padding=1))
self.time_conv = CausalConv3d(
dim, dim * 2, (3, 1, 1), padding=(1, 0, 0))
elif mode == 'downsample2d':
self.resample = nn.Sequential(
nn.ZeroPad2d((0, 1, 0, 1)),
nn.Conv2d(dim, dim, 3, stride=(2, 2)))
elif mode == 'downsample3d':
self.resample = nn.Sequential(
nn.ZeroPad2d((0, 1, 0, 1)),
nn.Conv2d(dim, dim, 3, stride=(2, 2)))
self.time_conv = CausalConv3d(
dim, dim, (3, 1, 1), stride=(2, 1, 1), padding=(0, 0, 0))
else:
self.resample = nn.Identity()
def forward(self, x, feat_cache=None, feat_idx=[0]):
b, c, t, h, w = x.size()
if self.mode == 'upsample3d':
if feat_cache is not None:
idx = feat_idx[0]
if feat_cache[idx] is None:
feat_cache[idx] = 'Rep'
feat_idx[0] += 1
else:
cache_x = x[:, :, -self.cache_t:, :, :].clone()
if cache_x.shape[2] < 2 and feat_cache[
idx] is not None and feat_cache[idx] != 'Rep':
# cache last frame of last two chunk
cache_x = torch.cat([
feat_cache[idx][:, :, -1, :, :].unsqueeze(2).to(
cache_x.device), cache_x
],
dim=2)
if cache_x.shape[2] < 2 and feat_cache[
idx] is not None and feat_cache[idx] == 'Rep':
cache_x = torch.cat([
torch.zeros_like(cache_x).to(cache_x.device),
cache_x
],
dim=2)
if feat_cache[idx] == 'Rep':
x = self.time_conv(x)
else:
x = self.time_conv(x, feat_cache[idx])
feat_cache[idx] = cache_x
feat_idx[0] += 1
x = x.reshape(b, 2, c, t, h, w)
x = torch.stack((x[:, 0, :, :, :, :], x[:, 1, :, :, :, :]),
3)
x = x.reshape(b, c, t * 2, h, w)
t = x.shape[2]
x = rearrange(x, 'b c t h w -> (b t) c h w')
x = self.resample(x)
x = rearrange(x, '(b t) c h w -> b c t h w', t=t)
if self.mode == 'downsample3d':
if feat_cache is not None:
idx = feat_idx[0]
if feat_cache[idx] is None:
feat_cache[idx] = x.clone()
feat_idx[0] += 1
else:
cache_x = x[:, :, -1:, :, :].clone()
# if cache_x.shape[2] < 2 and feat_cache[idx] is not None and feat_cache[idx]!='Rep':
# # cache last frame of last two chunk
# cache_x = torch.cat([feat_cache[idx][:, :, -1, :, :].unsqueeze(2).to(cache_x.device), cache_x], dim=2)
x = self.time_conv(
torch.cat([feat_cache[idx][:, :, -1:, :, :], x], 2))
feat_cache[idx] = cache_x
feat_idx[0] += 1
return x
def init_weight(self, conv):
conv_weight = conv.weight
nn.init.zeros_(conv_weight)
c1, c2, t, h, w = conv_weight.size()
one_matrix = torch.eye(c1, c2)
init_matrix = one_matrix
nn.init.zeros_(conv_weight)
# conv_weight.data[:,:,-1,1,1] = init_matrix * 0.5
conv_weight.data[:, :, 1, 0, 0] = init_matrix # * 0.5
conv.weight.data.copy_(conv_weight)
nn.init.zeros_(conv.bias.data)
def init_weight2(self, conv):
conv_weight = conv.weight.data
nn.init.zeros_(conv_weight)
c1, c2, t, h, w = conv_weight.size()
init_matrix = torch.eye(c1 // 2, c2)
# init_matrix = repeat(init_matrix, 'o ... -> (o 2) ...').permute(1,0,2).contiguous().reshape(c1,c2)
conv_weight[:c1 // 2, :, -1, 0, 0] = init_matrix
conv_weight[c1 // 2:, :, -1, 0, 0] = init_matrix
conv.weight.data.copy_(conv_weight)
nn.init.zeros_(conv.bias.data)
class VAEDecoderWrapper(nn.Module):
def __init__(self):
super().__init__()
self.decoder = VAEDecoder3d()
mean = [
-0.7571, -0.7089, -0.9113, 0.1075, -0.1745, 0.9653, -0.1517, 1.5508,
0.4134, -0.0715, 0.5517, -0.3632, -0.1922, -0.9497, 0.2503, -0.2921
]
std = [
2.8184, 1.4541, 2.3275, 2.6558, 1.2196, 1.7708, 2.6052, 2.0743,
3.2687, 2.1526, 2.8652, 1.5579, 1.6382, 1.1253, 2.8251, 1.9160
]
self.mean = torch.tensor(mean, dtype=torch.float32)
self.std = torch.tensor(std, dtype=torch.float32)
self.z_dim = 16
self.conv2 = CausalConv3d(self.z_dim, self.z_dim, 1)
def forward(
self,
z: torch.Tensor,
*feat_cache: List[torch.Tensor]
):
# from [batch_size, num_frames, num_channels, height, width]
# to [batch_size, num_channels, num_frames, height, width]
z = z.permute(0, 2, 1, 3, 4)
feat_cache = list(feat_cache)
print("Length of feat_cache: ", len(feat_cache))
device, dtype = z.device, z.dtype
scale = [self.mean.to(device=device, dtype=dtype),
1.0 / self.std.to(device=device, dtype=dtype)]
if isinstance(scale[0], torch.Tensor):
z = z / scale[1].view(1, self.z_dim, 1, 1, 1) + scale[0].view(
1, self.z_dim, 1, 1, 1)
else:
z = z / scale[1] + scale[0]
iter_ = z.shape[2]
x = self.conv2(z)
for i in range(iter_):
if i == 0:
out, feat_cache = self.decoder(
x[:, :, i:i + 1, :, :],
feat_cache=feat_cache)
else:
out_, feat_cache = self.decoder(
x[:, :, i:i + 1, :, :],
feat_cache=feat_cache)
out = torch.cat([out, out_], 2)
out = out.float().clamp_(-1, 1)
# from [batch_size, num_channels, num_frames, height, width]
# to [batch_size, num_frames, num_channels, height, width]
out = out.permute(0, 2, 1, 3, 4)
return out, feat_cache
class VAEDecoder3d(nn.Module):
def __init__(self,
dim=96,
z_dim=16,
dim_mult=[1, 2, 4, 4],
num_res_blocks=2,
attn_scales=[],
temperal_upsample=[True, True, False],
dropout=0.0):
super().__init__()
self.dim = dim
self.z_dim = z_dim
self.dim_mult = dim_mult
self.num_res_blocks = num_res_blocks
self.attn_scales = attn_scales
self.temperal_upsample = temperal_upsample
self.cache_t = 2
self.decoder_conv_num = 32
# dimensions
dims = [dim * u for u in [dim_mult[-1]] + dim_mult[::-1]]
scale = 1.0 / 2**(len(dim_mult) - 2)
# init block
self.conv1 = CausalConv3d(z_dim, dims[0], 3, padding=1)
# middle blocks
self.middle = nn.Sequential(
ResidualBlock(dims[0], dims[0], dropout), AttentionBlock(dims[0]),
ResidualBlock(dims[0], dims[0], dropout))
# upsample blocks
upsamples = []
for i, (in_dim, out_dim) in enumerate(zip(dims[:-1], dims[1:])):
# residual (+attention) blocks
if i == 1 or i == 2 or i == 3:
in_dim = in_dim // 2
for _ in range(num_res_blocks + 1):
upsamples.append(ResidualBlock(in_dim, out_dim, dropout))
if scale in attn_scales:
upsamples.append(AttentionBlock(out_dim))
in_dim = out_dim
# upsample block
if i != len(dim_mult) - 1:
mode = 'upsample3d' if temperal_upsample[i] else 'upsample2d'
upsamples.append(Resample(out_dim, mode=mode))
scale *= 2.0
self.upsamples = nn.Sequential(*upsamples)
# output blocks
self.head = nn.Sequential(
RMS_norm(out_dim, images=False), nn.SiLU(),
CausalConv3d(out_dim, 3, 3, padding=1))
def forward(
self,
x: torch.Tensor,
feat_cache: List[torch.Tensor]
):
feat_idx = [0]
# conv1
idx = feat_idx[0]
cache_x = x[:, :, -self.cache_t:, :, :].clone()
if cache_x.shape[2] < 2 and feat_cache[idx] is not None:
# cache last frame of last two chunk
cache_x = torch.cat([
feat_cache[idx][:, :, -1, :, :].unsqueeze(2).to(
cache_x.device), cache_x
],
dim=2)
x = self.conv1(x, feat_cache[idx])
feat_cache[idx] = cache_x
feat_idx[0] += 1
# middle
for layer in self.middle:
if isinstance(layer, ResidualBlock) and feat_cache is not None:
x = layer(x, feat_cache, feat_idx)
else:
x = layer(x)
# upsamples
for layer in self.upsamples:
x = layer(x, feat_cache, feat_idx)
# head
for layer in self.head:
if isinstance(layer, CausalConv3d) and feat_cache is not None:
idx = feat_idx[0]
cache_x = x[:, :, -self.cache_t:, :, :].clone()
if cache_x.shape[2] < 2 and feat_cache[idx] is not None:
# cache last frame of last two chunk
cache_x = torch.cat([
feat_cache[idx][:, :, -1, :, :].unsqueeze(2).to(
cache_x.device), cache_x
],
dim=2)
x = layer(x, feat_cache[idx])
feat_cache[idx] = cache_x
feat_idx[0] += 1
else:
x = layer(x)
return x, feat_cache