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# Copyright 2024-2025 The Alibaba Wan Team Authors. All rights reserved.
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import math
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import torch
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import torch.nn as nn
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from diffusers.configuration_utils import ConfigMixin, register_to_config
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from diffusers.models.modeling_utils import ModelMixin
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from ...enhance_a_video.enhance import get_feta_scores
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from ...enhance_a_video.globals import is_enhance_enabled
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from .attention import attention
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import numpy as np
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__all__ = ['WanModel']
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from tqdm import tqdm
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import gc
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import comfy.model_management as mm
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from ...utils import log, get_module_memory_mb
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def poly1d(coefficients, x):
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result = torch.zeros_like(x)
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for i, coeff in enumerate(coefficients):
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result += coeff * (x ** (len(coefficients) - 1 - i))
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return result.abs()
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def sinusoidal_embedding_1d(dim, position):
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# preprocess
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assert dim % 2 == 0
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half = dim // 2
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position = position.type(torch.float64)
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# calculation
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sinusoid = torch.outer(
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position, torch.pow(10000, -torch.arange(half).to(position).div(half)))
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x = torch.cat([torch.cos(sinusoid), torch.sin(sinusoid)], dim=1)
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return x
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def rope_params(max_seq_len, dim, theta=10000, L_test=25, k=0):
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assert dim % 2 == 0
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exponents = torch.arange(0, dim, 2, dtype=torch.float64).div(dim)
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inv_theta_pow = 1.0 / torch.pow(theta, exponents)
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if k > 0:
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print(f"RifleX: Using {k}th freq")
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inv_theta_pow[k-1] = 0.9 * 2 * torch.pi / L_test
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freqs = torch.outer(torch.arange(max_seq_len), inv_theta_pow)
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freqs = torch.polar(torch.ones_like(freqs), freqs)
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return freqs
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from comfy.model_management import get_torch_device, get_autocast_device
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@torch.autocast(device_type=get_autocast_device(get_torch_device()), enabled=False)
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@torch.compiler.disable()
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def rope_apply(x, grid_sizes, freqs):
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n, c = x.size(2), x.size(3) // 2
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# split freqs
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freqs = freqs.split([c - 2 * (c // 3), c // 3, c // 3], dim=1)
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# loop over samples
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output = []
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for i, (f, h, w) in enumerate(grid_sizes.tolist()):
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seq_len = f * h * w
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# precompute multipliers
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x_i = torch.view_as_complex(x[i, :seq_len].to(torch.float64).reshape(
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seq_len, n, -1, 2))
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freqs_i = torch.cat([
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freqs[0][:f].view(f, 1, 1, -1).expand(f, h, w, -1),
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freqs[1][:h].view(1, h, 1, -1).expand(f, h, w, -1),
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freqs[2][:w].view(1, 1, w, -1).expand(f, h, w, -1)
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],
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dim=-1).reshape(seq_len, 1, -1)
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# apply rotary embedding
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x_i = torch.view_as_real(x_i * freqs_i).flatten(2)
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x_i = torch.cat([x_i, x[i, seq_len:]])
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# append to collection
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output.append(x_i)
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return torch.stack(output).float()
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class WanRMSNorm(nn.Module):
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def __init__(self, dim, eps=1e-5):
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super().__init__()
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self.dim = dim
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self.eps = eps
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self.weight = nn.Parameter(torch.ones(dim))
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def forward(self, x):
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r"""
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Args:
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x(Tensor): Shape [B, L, C]
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"""
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return self._norm(x.float()).type_as(x) * self.weight
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def _norm(self, x):
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return x * torch.rsqrt(x.pow(2).mean(dim=-1, keepdim=True) + self.eps)
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class WanLayerNorm(nn.LayerNorm):
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def __init__(self, dim, eps=1e-6, elementwise_affine=False):
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super().__init__(dim, elementwise_affine=elementwise_affine, eps=eps)
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def forward(self, x):
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r"""
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Args:
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x(Tensor): Shape [B, L, C]
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"""
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return super().forward(x.float()).type_as(x)
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class WanSelfAttention(nn.Module):
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def __init__(self,
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dim,
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num_heads,
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window_size=(-1, -1),
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qk_norm=True,
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eps=1e-6,
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attention_mode='sdpa'):
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assert dim % num_heads == 0
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super().__init__()
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self.dim = dim
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self.num_heads = num_heads
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self.head_dim = dim // num_heads
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self.window_size = window_size
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self.qk_norm = qk_norm
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self.eps = eps
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self.attention_mode = attention_mode
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# layers
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self.q = nn.Linear(dim, dim)
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self.k = nn.Linear(dim, dim)
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self.v = nn.Linear(dim, dim)
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self.o = nn.Linear(dim, dim)
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self.norm_q = WanRMSNorm(dim, eps=eps) if qk_norm else nn.Identity()
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self.norm_k = WanRMSNorm(dim, eps=eps) if qk_norm else nn.Identity()
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def forward(self, x, seq_lens, grid_sizes, freqs):
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r"""
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Args:
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x(Tensor): Shape [B, L, num_heads, C / num_heads]
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seq_lens(Tensor): Shape [B]
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grid_sizes(Tensor): Shape [B, 3], the second dimension contains (F, H, W)
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freqs(Tensor): Rope freqs, shape [1024, C / num_heads / 2]
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"""
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b, s, n, d = *x.shape[:2], self.num_heads, self.head_dim
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# query, key, value function
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def qkv_fn(x):
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q = self.norm_q(self.q(x)).view(b, s, n, d)
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k = self.norm_k(self.k(x)).view(b, s, n, d)
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v = self.v(x).view(b, s, n, d)
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return q, k, v
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q, k, v = qkv_fn(x)
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if self.attention_mode == 'spargeattn_tune' or self.attention_mode == 'spargeattn':
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tune_mode = False
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if self.attention_mode == 'spargeattn_tune':
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tune_mode = True
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if hasattr(self, 'inner_attention'):
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#print("has inner attention")
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q=rope_apply(q, grid_sizes, freqs)
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k=rope_apply(k, grid_sizes, freqs)
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q = q.permute(0, 2, 1, 3)
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k = k.permute(0, 2, 1, 3)
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v = v.permute(0, 2, 1, 3)
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x = self.inner_attention(
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q=q,
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k=k,
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v=v,
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is_causal=False,
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tune_mode=tune_mode
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).permute(0, 2, 1, 3)
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#print("inner attention", x.shape) #inner attention torch.Size([1, 12, 32760, 128])
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else:
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q=rope_apply(q, grid_sizes, freqs)
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k=rope_apply(k, grid_sizes, freqs)
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if is_enhance_enabled():
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feta_scores = get_feta_scores(q, k)
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x = attention(
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q=q,
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k=k,
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v=v,
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k_lens=seq_lens,
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window_size=self.window_size,
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attention_mode=self.attention_mode)
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# output
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x = x.flatten(2)
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x = self.o(x)
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if is_enhance_enabled():
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x *= feta_scores
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return x
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class WanT2VCrossAttention(WanSelfAttention):
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def forward(self, x, context, context_lens):
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r"""
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Args:
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x(Tensor): Shape [B, L1, C]
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context(Tensor): Shape [B, L2, C]
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context_lens(Tensor): Shape [B]
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"""
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b, n, d = x.size(0), self.num_heads, self.head_dim
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# compute query, key, value
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q = self.norm_q(self.q(x)).view(b, -1, n, d)
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k = self.norm_k(self.k(context)).view(b, -1, n, d)
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v = self.v(context).view(b, -1, n, d)
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# compute attention
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x = attention(q, k, v, k_lens=context_lens, attention_mode=self.attention_mode)
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# output
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x = x.flatten(2)
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x = self.o(x)
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return x
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class WanI2VCrossAttention(WanSelfAttention):
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def __init__(self,
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dim,
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num_heads,
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window_size=(-1, -1),
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qk_norm=True,
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eps=1e-6,
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attention_mode='sdpa'):
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super().__init__(dim, num_heads, window_size, qk_norm, eps)
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self.k_img = nn.Linear(dim, dim)
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self.v_img = nn.Linear(dim, dim)
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# self.alpha = nn.Parameter(torch.zeros((1, )))
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self.norm_k_img = WanRMSNorm(dim, eps=eps) if qk_norm else nn.Identity()
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self.attention_mode = attention_mode
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def forward(self, x, context, context_lens):
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r"""
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Args:
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x(Tensor): Shape [B, L1, C]
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context(Tensor): Shape [B, L2, C]
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context_lens(Tensor): Shape [B]
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"""
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context_img = context[:, :257]
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context = context[:, 257:]
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b, n, d = x.size(0), self.num_heads, self.head_dim
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# compute query, key, value
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q = self.norm_q(self.q(x)).view(b, -1, n, d)
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k = self.norm_k(self.k(context)).view(b, -1, n, d)
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v = self.v(context).view(b, -1, n, d)
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k_img = self.norm_k_img(self.k_img(context_img)).view(b, -1, n, d)
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v_img = self.v_img(context_img).view(b, -1, n, d)
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img_x = attention(q, k_img, v_img, k_lens=None, attention_mode=self.attention_mode)
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# compute attention
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x = attention(q, k, v, k_lens=context_lens, attention_mode=self.attention_mode)
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# output
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x = x.flatten(2)
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img_x = img_x.flatten(2)
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x = x + img_x
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x = self.o(x)
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return x
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WAN_CROSSATTENTION_CLASSES = {
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't2v_cross_attn': WanT2VCrossAttention,
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'i2v_cross_attn': WanI2VCrossAttention,
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}
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class WanAttentionBlock(nn.Module):
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def __init__(self,
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cross_attn_type,
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dim,
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ffn_dim,
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num_heads,
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window_size=(-1, -1),
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qk_norm=True,
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cross_attn_norm=False,
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eps=1e-6,
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attention_mode='sdpa'):
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super().__init__()
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self.dim = dim
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self.ffn_dim = ffn_dim
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self.num_heads = num_heads
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self.window_size = window_size
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self.qk_norm = qk_norm
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self.cross_attn_norm = cross_attn_norm
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self.eps = eps
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self.attention_mode = attention_mode
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# layers
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self.norm1 = WanLayerNorm(dim, eps)
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self.self_attn = WanSelfAttention(dim, num_heads, window_size, qk_norm,
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eps, self.attention_mode)
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self.norm3 = WanLayerNorm(
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dim, eps,
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elementwise_affine=True) if cross_attn_norm else nn.Identity()
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self.cross_attn = WAN_CROSSATTENTION_CLASSES[cross_attn_type](dim,
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num_heads,
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(-1, -1),
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qk_norm,
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eps,#attention_mode=attention_mode sageattn doesn't seem faster here
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)
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self.norm2 = WanLayerNorm(dim, eps)
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self.ffn = nn.Sequential(
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nn.Linear(dim, ffn_dim), nn.GELU(approximate='tanh'),
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nn.Linear(ffn_dim, dim))
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# modulation
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self.modulation = nn.Parameter(torch.randn(1, 6, dim) / dim**0.5)
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def forward(
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self,
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x,
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e,
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seq_lens,
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grid_sizes,
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freqs,
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context,
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context_lens,
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):
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r"""
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Args:
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x(Tensor): Shape [B, L, C]
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e(Tensor): Shape [B, 6, C]
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seq_lens(Tensor): Shape [B], length of each sequence in batch
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grid_sizes(Tensor): Shape [B, 3], the second dimension contains (F, H, W)
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freqs(Tensor): Rope freqs, shape [1024, C / num_heads / 2]
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"""
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assert e.dtype == torch.float32
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e = (self.modulation.to(torch.float32).to(e.device) + e.to(torch.float32)).chunk(6, dim=1)
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assert e[0].dtype == torch.float32
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# self-attention
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y = self.self_attn(
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self.norm1(x).float() * (1 + e[1]) + e[0], seq_lens, grid_sizes,
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freqs)
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x = x.to(torch.float32) + (y.to(torch.float32) * e[2].to(torch.float32))
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# cross-attention & ffn function
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def cross_attn_ffn(x, context, context_lens, e):
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x = x + self.cross_attn(self.norm3(x), context, context_lens)
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y = self.ffn(self.norm2(x).float() * (1 + e[4]) + e[3])
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x = x.to(torch.float32) + (y.to(torch.float32) * e[5].to(torch.float32))
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return x
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x = cross_attn_ffn(x, context, context_lens, e)
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return x
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class Head(nn.Module):
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def __init__(self, dim, out_dim, patch_size, eps=1e-6):
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super().__init__()
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self.dim = dim
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self.out_dim = out_dim
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self.patch_size = patch_size
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self.eps = eps
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# layers
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out_dim = math.prod(patch_size) * out_dim
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self.norm = WanLayerNorm(dim, eps)
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self.head = nn.Linear(dim, out_dim)
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# modulation
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self.modulation = nn.Parameter(torch.randn(1, 2, dim) / dim**0.5)
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def forward(self, x, e):
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r"""
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Args:
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x(Tensor): Shape [B, L1, C]
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e(Tensor): Shape [B, C]
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"""
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assert e.dtype == torch.float32
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e_unsqueezed = e.unsqueeze(1).to(torch.float32)
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e = (self.modulation.to(torch.float32).to(e.device) + e_unsqueezed).chunk(2, dim=1)
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normed = self.norm(x).to(torch.float32)
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x = self.head(normed * (1 + e[1].to(torch.float32)) + e[0].to(torch.float32))
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return x
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class MLPProj(torch.nn.Module):
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def __init__(self, in_dim, out_dim):
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super().__init__()
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self.proj = torch.nn.Sequential(
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torch.nn.LayerNorm(in_dim), torch.nn.Linear(in_dim, in_dim),
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torch.nn.GELU(), torch.nn.Linear(in_dim, out_dim),
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torch.nn.LayerNorm(out_dim))
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def forward(self, image_embeds):
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clip_extra_context_tokens = self.proj(image_embeds)
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return clip_extra_context_tokens
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class WanModel(ModelMixin, ConfigMixin):
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r"""
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Wan diffusion backbone supporting both text-to-video and image-to-video.
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"""
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ignore_for_config = [
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'patch_size', 'cross_attn_norm', 'qk_norm', 'text_dim', 'window_size'
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]
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_no_split_modules = ['WanAttentionBlock']
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@register_to_config
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def __init__(self,
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model_type='t2v',
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patch_size=(1, 2, 2),
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text_len=512,
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in_dim=16,
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dim=2048,
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ffn_dim=8192,
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freq_dim=256,
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text_dim=4096,
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out_dim=16,
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num_heads=16,
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num_layers=32,
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window_size=(-1, -1),
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qk_norm=True,
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cross_attn_norm=True,
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eps=1e-6,
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attention_mode='sdpa',
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main_device=torch.device('cuda'),
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offload_device=torch.device('cpu'),
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teacache_coefficients=[],):
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r"""
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Initialize the diffusion model backbone.
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Args:
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model_type (`str`, *optional*, defaults to 't2v'):
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Model variant - 't2v' (text-to-video) or 'i2v' (image-to-video)
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||||
patch_size (`tuple`, *optional*, defaults to (1, 2, 2)):
|
||||
3D patch dimensions for video embedding (t_patch, h_patch, w_patch)
|
||||
text_len (`int`, *optional*, defaults to 512):
|
||||
Fixed length for text embeddings
|
||||
in_dim (`int`, *optional*, defaults to 16):
|
||||
Input video channels (C_in)
|
||||
dim (`int`, *optional*, defaults to 2048):
|
||||
Hidden dimension of the transformer
|
||||
ffn_dim (`int`, *optional*, defaults to 8192):
|
||||
Intermediate dimension in feed-forward network
|
||||
freq_dim (`int`, *optional*, defaults to 256):
|
||||
Dimension for sinusoidal time embeddings
|
||||
text_dim (`int`, *optional*, defaults to 4096):
|
||||
Input dimension for text embeddings
|
||||
out_dim (`int`, *optional*, defaults to 16):
|
||||
Output video channels (C_out)
|
||||
num_heads (`int`, *optional*, defaults to 16):
|
||||
Number of attention heads
|
||||
num_layers (`int`, *optional*, defaults to 32):
|
||||
Number of transformer blocks
|
||||
window_size (`tuple`, *optional*, defaults to (-1, -1)):
|
||||
Window size for local attention (-1 indicates global attention)
|
||||
qk_norm (`bool`, *optional*, defaults to True):
|
||||
Enable query/key normalization
|
||||
cross_attn_norm (`bool`, *optional*, defaults to False):
|
||||
Enable cross-attention normalization
|
||||
eps (`float`, *optional*, defaults to 1e-6):
|
||||
Epsilon value for normalization layers
|
||||
"""
|
||||
|
||||
super().__init__()
|
||||
|
||||
assert model_type in ['t2v', 'i2v']
|
||||
self.model_type = model_type
|
||||
|
||||
self.patch_size = patch_size
|
||||
self.text_len = text_len
|
||||
self.in_dim = in_dim
|
||||
self.dim = dim
|
||||
self.ffn_dim = ffn_dim
|
||||
self.freq_dim = freq_dim
|
||||
self.text_dim = text_dim
|
||||
self.out_dim = out_dim
|
||||
self.num_heads = num_heads
|
||||
self.num_layers = num_layers
|
||||
self.window_size = window_size
|
||||
self.qk_norm = qk_norm
|
||||
self.cross_attn_norm = cross_attn_norm
|
||||
self.eps = eps
|
||||
self.attention_mode = attention_mode
|
||||
self.main_device = main_device
|
||||
self.offload_device = offload_device
|
||||
|
||||
self.blocks_to_swap = -1
|
||||
self.offload_txt_emb = False
|
||||
self.offload_img_emb = False
|
||||
|
||||
#init TeaCache variables
|
||||
self.enable_teacache = False
|
||||
self.rel_l1_thresh = 0.15
|
||||
self.teacache_start_step= 0
|
||||
self.teacache_end_step = -1
|
||||
self.teacache_cache_device = main_device
|
||||
self.teacache_state = TeaCacheState()
|
||||
self.teacache_coefficients = teacache_coefficients
|
||||
self.teacache_use_coefficients = False
|
||||
|
||||
|
||||
self.slg_blocks = None
|
||||
self.slg_start_percent = 0.0
|
||||
self.slg_end_percent = 1.0
|
||||
# self.l1_history_x = []
|
||||
# self.l1_history_temb = []
|
||||
# self.l1_history_rescaled = []
|
||||
|
||||
# embeddings
|
||||
self.patch_embedding = nn.Conv3d(
|
||||
in_dim, dim, kernel_size=patch_size, stride=patch_size)
|
||||
self.text_embedding = nn.Sequential(
|
||||
nn.Linear(text_dim, dim), nn.GELU(approximate='tanh'),
|
||||
nn.Linear(dim, dim))
|
||||
|
||||
self.time_embedding = nn.Sequential(
|
||||
nn.Linear(freq_dim, dim), nn.SiLU(), nn.Linear(dim, dim))
|
||||
self.time_projection = nn.Sequential(nn.SiLU(), nn.Linear(dim, dim * 6))
|
||||
|
||||
# blocks
|
||||
cross_attn_type = 't2v_cross_attn' if model_type == 't2v' else 'i2v_cross_attn'
|
||||
self.blocks = nn.ModuleList([
|
||||
WanAttentionBlock(cross_attn_type, dim, ffn_dim, num_heads,
|
||||
window_size, qk_norm, cross_attn_norm, eps,
|
||||
attention_mode=self.attention_mode)
|
||||
for _ in range(num_layers)
|
||||
])
|
||||
|
||||
# head
|
||||
self.head = Head(dim, out_dim, patch_size, eps)
|
||||
|
||||
# buffers (don't use register_buffer otherwise dtype will be changed in to())
|
||||
assert (dim % num_heads) == 0 and (dim // num_heads) % 2 == 0
|
||||
|
||||
|
||||
if model_type == 'i2v':
|
||||
self.img_emb = MLPProj(1280, dim)
|
||||
|
||||
# initialize weights
|
||||
#self.init_weights()
|
||||
|
||||
def block_swap(self, blocks_to_swap, offload_txt_emb=False, offload_img_emb=False):
|
||||
print(f"Swapping {blocks_to_swap + 1} transformer blocks")
|
||||
self.blocks_to_swap = blocks_to_swap
|
||||
self.offload_img_emb = offload_img_emb
|
||||
self.offload_txt_emb = offload_txt_emb
|
||||
|
||||
total_offload_memory = 0
|
||||
total_main_memory = 0
|
||||
|
||||
for b, block in tqdm(enumerate(self.blocks), total=len(self.blocks), desc="Initializing block swap"):
|
||||
block_memory = get_module_memory_mb(block)
|
||||
|
||||
if b > self.blocks_to_swap:
|
||||
block.to(self.main_device)
|
||||
total_main_memory += block_memory
|
||||
else:
|
||||
block.to(self.offload_device)
|
||||
total_offload_memory += block_memory
|
||||
|
||||
mm.soft_empty_cache()
|
||||
gc.collect()
|
||||
|
||||
#print(f"Block {b}: {block_memory:.2f}MB on {block.parameters().__next__().device}")
|
||||
log.info("----------------------")
|
||||
log.info(f"Block swap memory summary:")
|
||||
log.info(f"Transformer blocks on {self.offload_device}: {total_offload_memory:.2f}MB")
|
||||
log.info(f"Transformer blocks on {self.main_device}: {total_main_memory:.2f}MB")
|
||||
log.info(f"Total memory used by transformer blocks: {(total_offload_memory + total_main_memory):.2f}MB")
|
||||
log.info("----------------------")
|
||||
|
||||
def forward(
|
||||
self,
|
||||
x,
|
||||
t,
|
||||
context,
|
||||
seq_len,
|
||||
is_uncond=False,
|
||||
current_step_percentage=0.0,
|
||||
clip_fea=None,
|
||||
y=None,
|
||||
device=torch.device('cuda'),
|
||||
freqs=None,
|
||||
current_step=0,
|
||||
pred_id=None
|
||||
):
|
||||
r"""
|
||||
Forward pass through the diffusion model
|
||||
|
||||
Args:
|
||||
x (List[Tensor]):
|
||||
List of input video tensors, each with shape [C_in, F, H, W]
|
||||
t (Tensor):
|
||||
Diffusion timesteps tensor of shape [B]
|
||||
context (List[Tensor]):
|
||||
List of text embeddings each with shape [L, C]
|
||||
seq_len (`int`):
|
||||
Maximum sequence length for positional encoding
|
||||
clip_fea (Tensor, *optional*):
|
||||
CLIP image features for image-to-video mode
|
||||
y (List[Tensor], *optional*):
|
||||
Conditional video inputs for image-to-video mode, same shape as x
|
||||
|
||||
Returns:
|
||||
List[Tensor]:
|
||||
List of denoised video tensors with original input shapes [C_out, F, H / 8, W / 8]
|
||||
"""
|
||||
if self.model_type == 'i2v':
|
||||
assert clip_fea is not None and y is not None
|
||||
# params
|
||||
#device = self.patch_embedding.weight.device
|
||||
if freqs.device != device:
|
||||
freqs = freqs.to(device)
|
||||
|
||||
if y is not None:
|
||||
#torch.Size([20, 17, 58, 104]) torch.Size([16, 17, 58, 104])
|
||||
#c ,t,h,w
|
||||
x = torch.cat([x, y], dim=0)
|
||||
|
||||
# embeddings
|
||||
x = [self.patch_embedding(x.unsqueeze(0))]
|
||||
grid_sizes = torch.stack(
|
||||
[torch.tensor(u.shape[2:], dtype=torch.long) for u in x])
|
||||
x = [u.flatten(2).transpose(1, 2) for u in x]
|
||||
seq_lens = torch.tensor([u.size(1) for u in x], dtype=torch.long)
|
||||
assert seq_lens.max() <= seq_len
|
||||
x = torch.cat([
|
||||
torch.cat([u, u.new_zeros(1, seq_len - u.size(1), u.size(2))],
|
||||
dim=1) for u in x
|
||||
])
|
||||
|
||||
# time embeddings
|
||||
with torch.autocast(device_type='cuda', dtype=torch.float32):
|
||||
e = self.time_embedding(
|
||||
sinusoidal_embedding_1d(self.freq_dim, t).float())
|
||||
e0 = self.time_projection(e).unflatten(1, (6, self.dim))
|
||||
assert e.dtype == torch.float32 and e0.dtype == torch.float32
|
||||
|
||||
# context
|
||||
context_lens = None
|
||||
if self.offload_txt_emb:
|
||||
self.text_embedding.to(self.main_device)
|
||||
context = self.text_embedding(
|
||||
torch.stack([
|
||||
torch.cat(
|
||||
[u, u.new_zeros(self.text_len - u.size(0), u.size(1))])
|
||||
for u in context
|
||||
]))
|
||||
if self.offload_txt_emb:
|
||||
self.text_embedding.to(self.offload_device, non_blocking=True)
|
||||
|
||||
if clip_fea is not None:
|
||||
if self.offload_img_emb:
|
||||
self.img_emb.to(self.main_device)
|
||||
context_clip = self.img_emb(clip_fea) # bs x 257 x dim
|
||||
context = torch.concat([context_clip, context], dim=1)
|
||||
if self.offload_img_emb:
|
||||
self.img_emb.to(self.offload_device, non_blocking=True)
|
||||
|
||||
should_calc = True
|
||||
accumulated_rel_l1_distance = torch.tensor(0.0, dtype=torch.float32, device=device)
|
||||
if self.enable_teacache and self.teacache_start_step <= current_step <= self.teacache_end_step:
|
||||
if pred_id is None:
|
||||
pred_id = self.teacache_state.new_prediction()
|
||||
#log.info(current_step)
|
||||
#log.info(f"TeaCache: Initializing TeaCache variables for model pred: {pred_id}")
|
||||
should_calc = True
|
||||
else:
|
||||
previous_modulated_input = self.teacache_state.get(pred_id)['previous_modulated_input']
|
||||
previous_modulated_input = previous_modulated_input.to(device)
|
||||
previous_residual = self.teacache_state.get(pred_id)['previous_residual']
|
||||
accumulated_rel_l1_distance = self.teacache_state.get(pred_id)['accumulated_rel_l1_distance']
|
||||
|
||||
if self.teacache_use_coefficients:
|
||||
rescale_func = np.poly1d(self.teacache_coefficients)
|
||||
accumulated_rel_l1_distance += rescale_func(((e-previous_modulated_input).abs().mean() / previous_modulated_input.abs().mean()).cpu().item())
|
||||
else:
|
||||
temb_relative_l1 = relative_l1_distance(previous_modulated_input, e0)
|
||||
accumulated_rel_l1_distance = accumulated_rel_l1_distance.to(e0.device) + temb_relative_l1
|
||||
|
||||
#print("accumulated_rel_l1_distance", accumulated_rel_l1_distance)
|
||||
|
||||
if accumulated_rel_l1_distance < self.rel_l1_thresh:
|
||||
should_calc = False
|
||||
else:
|
||||
should_calc = True
|
||||
accumulated_rel_l1_distance = torch.tensor(0.0, dtype=torch.float32, device=device)
|
||||
|
||||
previous_modulated_input = e.clone() if self.teacache_use_coefficients else e0.clone()
|
||||
if not should_calc:
|
||||
x += previous_residual.to(x.device)
|
||||
#log.info(f"TeaCache: Skipping uncond step {current_step+1}")
|
||||
self.teacache_state.update(
|
||||
pred_id,
|
||||
accumulated_rel_l1_distance=accumulated_rel_l1_distance,
|
||||
skipped_steps=self.teacache_state.get(pred_id)['skipped_steps'] + 1,
|
||||
)
|
||||
|
||||
if not self.enable_teacache or (self.enable_teacache and should_calc):
|
||||
if self.enable_teacache:
|
||||
original_x = x.clone()
|
||||
# arguments
|
||||
kwargs = dict(
|
||||
e=e0,
|
||||
seq_lens=seq_lens,
|
||||
grid_sizes=grid_sizes,
|
||||
freqs=freqs,
|
||||
context=context,
|
||||
context_lens=context_lens)
|
||||
|
||||
for b, block in enumerate(self.blocks):
|
||||
if self.slg_blocks is not None:
|
||||
if b in self.slg_blocks and is_uncond:
|
||||
if self.slg_start_percent <= current_step_percentage <= self.slg_end_percent:
|
||||
continue
|
||||
if b <= self.blocks_to_swap and self.blocks_to_swap >= 0:
|
||||
block.to(self.main_device)
|
||||
x = block(x, **kwargs)
|
||||
if b <= self.blocks_to_swap and self.blocks_to_swap >= 0:
|
||||
block.to(self.offload_device, non_blocking=True)
|
||||
|
||||
if self.enable_teacache and pred_id is not None:
|
||||
self.teacache_state.update(
|
||||
pred_id,
|
||||
previous_residual=(x - original_x),
|
||||
accumulated_rel_l1_distance=accumulated_rel_l1_distance,
|
||||
previous_modulated_input=previous_modulated_input
|
||||
)
|
||||
#self.teacache_state.report()
|
||||
|
||||
# head
|
||||
x = self.head(x, e)
|
||||
# unpatchify
|
||||
x = self.unpatchify(x, grid_sizes)
|
||||
return x, pred_id
|
||||
|
||||
def unpatchify(self, x, grid_sizes):
|
||||
r"""
|
||||
Reconstruct video tensors from patch embeddings.
|
||||
|
||||
Args:
|
||||
x (List[Tensor]):
|
||||
List of patchified features, each with shape [L, C_out * prod(patch_size)]
|
||||
grid_sizes (Tensor):
|
||||
Original spatial-temporal grid dimensions before patching,
|
||||
shape [B, 3] (3 dimensions correspond to F_patches, H_patches, W_patches)
|
||||
|
||||
Returns:
|
||||
List[Tensor]:
|
||||
Reconstructed video tensors with shape [C_out, F, H / 8, W / 8]
|
||||
"""
|
||||
|
||||
c = self.out_dim
|
||||
for v in grid_sizes.tolist():
|
||||
x = x[:math.prod(v)].view(*v, *self.patch_size, c)
|
||||
x = torch.einsum('fhwpqrc->cfphqwr', x)
|
||||
x = x.reshape(c, *[i * j for i, j in zip(v, self.patch_size)])
|
||||
return x
|
||||
|
||||
class TeaCacheState:
|
||||
def __init__(self, cache_device='cpu'):
|
||||
self.cache_device = cache_device
|
||||
self.states = {}
|
||||
self._next_pred_id = 0
|
||||
|
||||
def new_prediction(self):
|
||||
"""Create new prediction state and return its ID"""
|
||||
pred_id = self._next_pred_id
|
||||
self._next_pred_id += 1
|
||||
self.states[pred_id] = {
|
||||
'previous_residual': None,
|
||||
'accumulated_rel_l1_distance': 0,
|
||||
'previous_modulated_input': None,
|
||||
'skipped_steps': 0
|
||||
}
|
||||
return pred_id
|
||||
|
||||
def update(self, pred_id, **kwargs):
|
||||
"""Update state for specific prediction"""
|
||||
if pred_id not in self.states:
|
||||
return None
|
||||
for key, value in kwargs.items():
|
||||
if isinstance(value, torch.Tensor):
|
||||
value = value.to(self.cache_device)
|
||||
self.states[pred_id][key] = value
|
||||
|
||||
def get(self, pred_id):
|
||||
return self.states.get(pred_id, {})
|
||||
|
||||
def report(self):
|
||||
for pred_id in self.states:
|
||||
log.info(f"Prediction {pred_id}: {self.states[pred_id]}")
|
||||
|
||||
def clear_prediction(self, pred_id):
|
||||
if pred_id in self.states:
|
||||
del self.states[pred_id]
|
||||
|
||||
def clear_all(self):
|
||||
self.states.clear()
|
||||
self._next_pred_id = 0
|
||||
|
||||
def relative_l1_distance(last_tensor, current_tensor):
|
||||
l1_distance = torch.abs(last_tensor.to(current_tensor.device) - current_tensor).mean()
|
||||
norm = torch.abs(last_tensor).mean()
|
||||
relative_l1_distance = l1_distance / norm
|
||||
return relative_l1_distance.to(torch.float32).to(current_tensor.device)
|
||||
|
||||
def normalize_values(values):
|
||||
min_val = min(values)
|
||||
max_val = max(values)
|
||||
if max_val == min_val:
|
||||
return [0.0] * len(values)
|
||||
return [(x - min_val) / (max_val - min_val) for x in values]
|
||||
|
||||
def rescale_differences(input_diffs, output_diffs):
|
||||
"""Polynomial fitting between input and output differences"""
|
||||
poly_degree = 4
|
||||
if len(input_diffs) < 2:
|
||||
return input_diffs
|
||||
|
||||
x = np.array([x.item() for x in input_diffs])
|
||||
y = np.array([y.item() for y in output_diffs])
|
||||
print("x ", x)
|
||||
print("y ", y)
|
||||
|
||||
# Fit polynomial
|
||||
coeffs = np.polyfit(x, y, poly_degree)
|
||||
|
||||
# Apply polynomial transformation
|
||||
return np.polyval(coeffs, x)
|
||||
Reference in New Issue
Block a user