mirror of
https://git.datalinker.icu/comfyanonymous/ComfyUI
synced 2025-12-09 14:04:26 +08:00
601 lines
22 KiB
Python
601 lines
22 KiB
Python
# Code from: https://github.com/Alpha-VLLM/Lumina-Image-2.0/blob/main/models/model.py
|
|
from __future__ import annotations
|
|
|
|
from typing import List, Optional, Tuple
|
|
|
|
import torch
|
|
import torch.nn as nn
|
|
import torch.nn.functional as F
|
|
import comfy.ldm.common_dit
|
|
|
|
from comfy.ldm.modules.diffusionmodules.mmdit import TimestepEmbedder
|
|
from comfy.ldm.modules.attention import optimized_attention_masked
|
|
from comfy.ldm.flux.layers import EmbedND
|
|
from comfy.ldm.flux.math import apply_rope
|
|
import comfy.patcher_extension
|
|
|
|
|
|
def modulate(x, scale):
|
|
return x * (1 + scale.unsqueeze(1))
|
|
|
|
#############################################################################
|
|
# Core NextDiT Model #
|
|
#############################################################################
|
|
|
|
def clamp_fp16(x):
|
|
if x.dtype == torch.float16:
|
|
return torch.nan_to_num(x, nan=0.0, posinf=65504, neginf=-65504)
|
|
return x
|
|
|
|
class JointAttention(nn.Module):
|
|
"""Multi-head attention module."""
|
|
|
|
def __init__(
|
|
self,
|
|
dim: int,
|
|
n_heads: int,
|
|
n_kv_heads: Optional[int],
|
|
qk_norm: bool,
|
|
out_bias: bool = False,
|
|
operation_settings={},
|
|
):
|
|
"""
|
|
Initialize the Attention module.
|
|
|
|
Args:
|
|
dim (int): Number of input dimensions.
|
|
n_heads (int): Number of heads.
|
|
n_kv_heads (Optional[int]): Number of kv heads, if using GQA.
|
|
|
|
"""
|
|
super().__init__()
|
|
self.n_kv_heads = n_heads if n_kv_heads is None else n_kv_heads
|
|
self.n_local_heads = n_heads
|
|
self.n_local_kv_heads = self.n_kv_heads
|
|
self.n_rep = self.n_local_heads // self.n_local_kv_heads
|
|
self.head_dim = dim // n_heads
|
|
|
|
self.qkv = operation_settings.get("operations").Linear(
|
|
dim,
|
|
(n_heads + self.n_kv_heads + self.n_kv_heads) * self.head_dim,
|
|
bias=False,
|
|
device=operation_settings.get("device"),
|
|
dtype=operation_settings.get("dtype"),
|
|
)
|
|
self.out = operation_settings.get("operations").Linear(
|
|
n_heads * self.head_dim,
|
|
dim,
|
|
bias=out_bias,
|
|
device=operation_settings.get("device"),
|
|
dtype=operation_settings.get("dtype"),
|
|
)
|
|
|
|
if qk_norm:
|
|
self.q_norm = operation_settings.get("operations").RMSNorm(self.head_dim, elementwise_affine=True, device=operation_settings.get("device"), dtype=operation_settings.get("dtype"))
|
|
self.k_norm = operation_settings.get("operations").RMSNorm(self.head_dim, elementwise_affine=True, device=operation_settings.get("device"), dtype=operation_settings.get("dtype"))
|
|
else:
|
|
self.q_norm = self.k_norm = nn.Identity()
|
|
|
|
def forward(
|
|
self,
|
|
x: torch.Tensor,
|
|
x_mask: torch.Tensor,
|
|
freqs_cis: torch.Tensor,
|
|
transformer_options={},
|
|
) -> torch.Tensor:
|
|
"""
|
|
|
|
Args:
|
|
x:
|
|
x_mask:
|
|
freqs_cis:
|
|
|
|
Returns:
|
|
|
|
"""
|
|
bsz, seqlen, _ = x.shape
|
|
|
|
xq, xk, xv = torch.split(
|
|
self.qkv(x),
|
|
[
|
|
self.n_local_heads * self.head_dim,
|
|
self.n_local_kv_heads * self.head_dim,
|
|
self.n_local_kv_heads * self.head_dim,
|
|
],
|
|
dim=-1,
|
|
)
|
|
xq = xq.view(bsz, seqlen, self.n_local_heads, self.head_dim)
|
|
xk = xk.view(bsz, seqlen, self.n_local_kv_heads, self.head_dim)
|
|
xv = xv.view(bsz, seqlen, self.n_local_kv_heads, self.head_dim)
|
|
|
|
xq = self.q_norm(xq)
|
|
xk = self.k_norm(xk)
|
|
|
|
xq, xk = apply_rope(xq, xk, freqs_cis)
|
|
|
|
n_rep = self.n_local_heads // self.n_local_kv_heads
|
|
if n_rep >= 1:
|
|
xk = xk.unsqueeze(3).repeat(1, 1, 1, n_rep, 1).flatten(2, 3)
|
|
xv = xv.unsqueeze(3).repeat(1, 1, 1, n_rep, 1).flatten(2, 3)
|
|
output = optimized_attention_masked(xq.movedim(1, 2), xk.movedim(1, 2), xv.movedim(1, 2), self.n_local_heads, x_mask, skip_reshape=True, transformer_options=transformer_options)
|
|
|
|
return self.out(output)
|
|
|
|
|
|
class FeedForward(nn.Module):
|
|
def __init__(
|
|
self,
|
|
dim: int,
|
|
hidden_dim: int,
|
|
multiple_of: int,
|
|
ffn_dim_multiplier: Optional[float],
|
|
operation_settings={},
|
|
):
|
|
"""
|
|
Initialize the FeedForward module.
|
|
|
|
Args:
|
|
dim (int): Input dimension.
|
|
hidden_dim (int): Hidden dimension of the feedforward layer.
|
|
multiple_of (int): Value to ensure hidden dimension is a multiple
|
|
of this value.
|
|
ffn_dim_multiplier (float, optional): Custom multiplier for hidden
|
|
dimension. Defaults to None.
|
|
|
|
"""
|
|
super().__init__()
|
|
# custom dim factor multiplier
|
|
if ffn_dim_multiplier is not None:
|
|
hidden_dim = int(ffn_dim_multiplier * hidden_dim)
|
|
hidden_dim = multiple_of * ((hidden_dim + multiple_of - 1) // multiple_of)
|
|
|
|
self.w1 = operation_settings.get("operations").Linear(
|
|
dim,
|
|
hidden_dim,
|
|
bias=False,
|
|
device=operation_settings.get("device"),
|
|
dtype=operation_settings.get("dtype"),
|
|
)
|
|
self.w2 = operation_settings.get("operations").Linear(
|
|
hidden_dim,
|
|
dim,
|
|
bias=False,
|
|
device=operation_settings.get("device"),
|
|
dtype=operation_settings.get("dtype"),
|
|
)
|
|
self.w3 = operation_settings.get("operations").Linear(
|
|
dim,
|
|
hidden_dim,
|
|
bias=False,
|
|
device=operation_settings.get("device"),
|
|
dtype=operation_settings.get("dtype"),
|
|
)
|
|
|
|
# @torch.compile
|
|
def _forward_silu_gating(self, x1, x3):
|
|
return clamp_fp16(F.silu(x1) * x3)
|
|
|
|
def forward(self, x):
|
|
return self.w2(self._forward_silu_gating(self.w1(x), self.w3(x)))
|
|
|
|
|
|
class JointTransformerBlock(nn.Module):
|
|
def __init__(
|
|
self,
|
|
layer_id: int,
|
|
dim: int,
|
|
n_heads: int,
|
|
n_kv_heads: int,
|
|
multiple_of: int,
|
|
ffn_dim_multiplier: float,
|
|
norm_eps: float,
|
|
qk_norm: bool,
|
|
modulation=True,
|
|
z_image_modulation=False,
|
|
attn_out_bias=False,
|
|
operation_settings={},
|
|
) -> None:
|
|
"""
|
|
Initialize a TransformerBlock.
|
|
|
|
Args:
|
|
layer_id (int): Identifier for the layer.
|
|
dim (int): Embedding dimension of the input features.
|
|
n_heads (int): Number of attention heads.
|
|
n_kv_heads (Optional[int]): Number of attention heads in key and
|
|
value features (if using GQA), or set to None for the same as
|
|
query.
|
|
multiple_of (int):
|
|
ffn_dim_multiplier (float):
|
|
norm_eps (float):
|
|
|
|
"""
|
|
super().__init__()
|
|
self.dim = dim
|
|
self.head_dim = dim // n_heads
|
|
self.attention = JointAttention(dim, n_heads, n_kv_heads, qk_norm, out_bias=attn_out_bias, operation_settings=operation_settings)
|
|
self.feed_forward = FeedForward(
|
|
dim=dim,
|
|
hidden_dim=dim,
|
|
multiple_of=multiple_of,
|
|
ffn_dim_multiplier=ffn_dim_multiplier,
|
|
operation_settings=operation_settings,
|
|
)
|
|
self.layer_id = layer_id
|
|
self.attention_norm1 = operation_settings.get("operations").RMSNorm(dim, eps=norm_eps, elementwise_affine=True, device=operation_settings.get("device"), dtype=operation_settings.get("dtype"))
|
|
self.ffn_norm1 = operation_settings.get("operations").RMSNorm(dim, eps=norm_eps, elementwise_affine=True, device=operation_settings.get("device"), dtype=operation_settings.get("dtype"))
|
|
|
|
self.attention_norm2 = operation_settings.get("operations").RMSNorm(dim, eps=norm_eps, elementwise_affine=True, device=operation_settings.get("device"), dtype=operation_settings.get("dtype"))
|
|
self.ffn_norm2 = operation_settings.get("operations").RMSNorm(dim, eps=norm_eps, elementwise_affine=True, device=operation_settings.get("device"), dtype=operation_settings.get("dtype"))
|
|
|
|
self.modulation = modulation
|
|
if modulation:
|
|
if z_image_modulation:
|
|
self.adaLN_modulation = nn.Sequential(
|
|
operation_settings.get("operations").Linear(
|
|
min(dim, 256),
|
|
4 * dim,
|
|
bias=True,
|
|
device=operation_settings.get("device"),
|
|
dtype=operation_settings.get("dtype"),
|
|
),
|
|
)
|
|
else:
|
|
self.adaLN_modulation = nn.Sequential(
|
|
nn.SiLU(),
|
|
operation_settings.get("operations").Linear(
|
|
min(dim, 1024),
|
|
4 * dim,
|
|
bias=True,
|
|
device=operation_settings.get("device"),
|
|
dtype=operation_settings.get("dtype"),
|
|
),
|
|
)
|
|
|
|
def forward(
|
|
self,
|
|
x: torch.Tensor,
|
|
x_mask: torch.Tensor,
|
|
freqs_cis: torch.Tensor,
|
|
adaln_input: Optional[torch.Tensor]=None,
|
|
transformer_options={},
|
|
):
|
|
"""
|
|
Perform a forward pass through the TransformerBlock.
|
|
|
|
Args:
|
|
x (torch.Tensor): Input tensor.
|
|
freqs_cis (torch.Tensor): Precomputed cosine and sine frequencies.
|
|
|
|
Returns:
|
|
torch.Tensor: Output tensor after applying attention and
|
|
feedforward layers.
|
|
|
|
"""
|
|
if self.modulation:
|
|
assert adaln_input is not None
|
|
scale_msa, gate_msa, scale_mlp, gate_mlp = self.adaLN_modulation(adaln_input).chunk(4, dim=1)
|
|
|
|
x = x + gate_msa.unsqueeze(1).tanh() * self.attention_norm2(
|
|
clamp_fp16(self.attention(
|
|
modulate(self.attention_norm1(x), scale_msa),
|
|
x_mask,
|
|
freqs_cis,
|
|
transformer_options=transformer_options,
|
|
))
|
|
)
|
|
x = x + gate_mlp.unsqueeze(1).tanh() * self.ffn_norm2(
|
|
clamp_fp16(self.feed_forward(
|
|
modulate(self.ffn_norm1(x), scale_mlp),
|
|
))
|
|
)
|
|
else:
|
|
assert adaln_input is None
|
|
x = x + self.attention_norm2(
|
|
clamp_fp16(self.attention(
|
|
self.attention_norm1(x),
|
|
x_mask,
|
|
freqs_cis,
|
|
transformer_options=transformer_options,
|
|
))
|
|
)
|
|
x = x + self.ffn_norm2(
|
|
self.feed_forward(
|
|
self.ffn_norm1(x),
|
|
)
|
|
)
|
|
return x
|
|
|
|
|
|
class FinalLayer(nn.Module):
|
|
"""
|
|
The final layer of NextDiT.
|
|
"""
|
|
|
|
def __init__(self, hidden_size, patch_size, out_channels, z_image_modulation=False, operation_settings={}):
|
|
super().__init__()
|
|
self.norm_final = operation_settings.get("operations").LayerNorm(
|
|
hidden_size,
|
|
elementwise_affine=False,
|
|
eps=1e-6,
|
|
device=operation_settings.get("device"),
|
|
dtype=operation_settings.get("dtype"),
|
|
)
|
|
self.linear = operation_settings.get("operations").Linear(
|
|
hidden_size,
|
|
patch_size * patch_size * out_channels,
|
|
bias=True,
|
|
device=operation_settings.get("device"),
|
|
dtype=operation_settings.get("dtype"),
|
|
)
|
|
|
|
if z_image_modulation:
|
|
min_mod = 256
|
|
else:
|
|
min_mod = 1024
|
|
|
|
self.adaLN_modulation = nn.Sequential(
|
|
nn.SiLU(),
|
|
operation_settings.get("operations").Linear(
|
|
min(hidden_size, min_mod),
|
|
hidden_size,
|
|
bias=True,
|
|
device=operation_settings.get("device"),
|
|
dtype=operation_settings.get("dtype"),
|
|
),
|
|
)
|
|
|
|
def forward(self, x, c):
|
|
scale = self.adaLN_modulation(c)
|
|
x = modulate(self.norm_final(x), scale)
|
|
x = self.linear(x)
|
|
return x
|
|
|
|
|
|
class NextDiT(nn.Module):
|
|
"""
|
|
Diffusion model with a Transformer backbone.
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
patch_size: int = 2,
|
|
in_channels: int = 4,
|
|
dim: int = 4096,
|
|
n_layers: int = 32,
|
|
n_refiner_layers: int = 2,
|
|
n_heads: int = 32,
|
|
n_kv_heads: Optional[int] = None,
|
|
multiple_of: int = 256,
|
|
ffn_dim_multiplier: float = 4.0,
|
|
norm_eps: float = 1e-5,
|
|
qk_norm: bool = False,
|
|
cap_feat_dim: int = 5120,
|
|
axes_dims: List[int] = (16, 56, 56),
|
|
axes_lens: List[int] = (1, 512, 512),
|
|
rope_theta=10000.0,
|
|
z_image_modulation=False,
|
|
time_scale=1.0,
|
|
pad_tokens_multiple=None,
|
|
image_model=None,
|
|
device=None,
|
|
dtype=None,
|
|
operations=None,
|
|
) -> None:
|
|
super().__init__()
|
|
self.dtype = dtype
|
|
operation_settings = {"operations": operations, "device": device, "dtype": dtype}
|
|
self.in_channels = in_channels
|
|
self.out_channels = in_channels
|
|
self.patch_size = patch_size
|
|
self.time_scale = time_scale
|
|
self.pad_tokens_multiple = pad_tokens_multiple
|
|
|
|
self.x_embedder = operation_settings.get("operations").Linear(
|
|
in_features=patch_size * patch_size * in_channels,
|
|
out_features=dim,
|
|
bias=True,
|
|
device=operation_settings.get("device"),
|
|
dtype=operation_settings.get("dtype"),
|
|
)
|
|
|
|
self.noise_refiner = nn.ModuleList(
|
|
[
|
|
JointTransformerBlock(
|
|
layer_id,
|
|
dim,
|
|
n_heads,
|
|
n_kv_heads,
|
|
multiple_of,
|
|
ffn_dim_multiplier,
|
|
norm_eps,
|
|
qk_norm,
|
|
modulation=True,
|
|
z_image_modulation=z_image_modulation,
|
|
operation_settings=operation_settings,
|
|
)
|
|
for layer_id in range(n_refiner_layers)
|
|
]
|
|
)
|
|
self.context_refiner = nn.ModuleList(
|
|
[
|
|
JointTransformerBlock(
|
|
layer_id,
|
|
dim,
|
|
n_heads,
|
|
n_kv_heads,
|
|
multiple_of,
|
|
ffn_dim_multiplier,
|
|
norm_eps,
|
|
qk_norm,
|
|
modulation=False,
|
|
operation_settings=operation_settings,
|
|
)
|
|
for layer_id in range(n_refiner_layers)
|
|
]
|
|
)
|
|
|
|
self.t_embedder = TimestepEmbedder(min(dim, 1024), output_size=256 if z_image_modulation else None, **operation_settings)
|
|
self.cap_embedder = nn.Sequential(
|
|
operation_settings.get("operations").RMSNorm(cap_feat_dim, eps=norm_eps, elementwise_affine=True, device=operation_settings.get("device"), dtype=operation_settings.get("dtype")),
|
|
operation_settings.get("operations").Linear(
|
|
cap_feat_dim,
|
|
dim,
|
|
bias=True,
|
|
device=operation_settings.get("device"),
|
|
dtype=operation_settings.get("dtype"),
|
|
),
|
|
)
|
|
|
|
self.layers = nn.ModuleList(
|
|
[
|
|
JointTransformerBlock(
|
|
layer_id,
|
|
dim,
|
|
n_heads,
|
|
n_kv_heads,
|
|
multiple_of,
|
|
ffn_dim_multiplier,
|
|
norm_eps,
|
|
qk_norm,
|
|
z_image_modulation=z_image_modulation,
|
|
attn_out_bias=False,
|
|
operation_settings=operation_settings,
|
|
)
|
|
for layer_id in range(n_layers)
|
|
]
|
|
)
|
|
self.norm_final = operation_settings.get("operations").RMSNorm(dim, eps=norm_eps, elementwise_affine=True, device=operation_settings.get("device"), dtype=operation_settings.get("dtype"))
|
|
self.final_layer = FinalLayer(dim, patch_size, self.out_channels, z_image_modulation=z_image_modulation, operation_settings=operation_settings)
|
|
|
|
if self.pad_tokens_multiple is not None:
|
|
self.x_pad_token = nn.Parameter(torch.empty((1, dim), device=device, dtype=dtype))
|
|
self.cap_pad_token = nn.Parameter(torch.empty((1, dim), device=device, dtype=dtype))
|
|
|
|
assert (dim // n_heads) == sum(axes_dims)
|
|
self.axes_dims = axes_dims
|
|
self.axes_lens = axes_lens
|
|
self.rope_embedder = EmbedND(dim=dim // n_heads, theta=rope_theta, axes_dim=axes_dims)
|
|
self.dim = dim
|
|
self.n_heads = n_heads
|
|
|
|
def unpatchify(
|
|
self, x: torch.Tensor, img_size: List[Tuple[int, int]], cap_size: List[int], return_tensor=False
|
|
) -> List[torch.Tensor]:
|
|
"""
|
|
x: (N, T, patch_size**2 * C)
|
|
imgs: (N, H, W, C)
|
|
"""
|
|
pH = pW = self.patch_size
|
|
imgs = []
|
|
for i in range(x.size(0)):
|
|
H, W = img_size[i]
|
|
begin = cap_size[i]
|
|
end = begin + (H // pH) * (W // pW)
|
|
imgs.append(
|
|
x[i][begin:end]
|
|
.view(H // pH, W // pW, pH, pW, self.out_channels)
|
|
.permute(4, 0, 2, 1, 3)
|
|
.flatten(3, 4)
|
|
.flatten(1, 2)
|
|
)
|
|
|
|
if return_tensor:
|
|
imgs = torch.stack(imgs, dim=0)
|
|
return imgs
|
|
|
|
def patchify_and_embed(
|
|
self, x: List[torch.Tensor] | torch.Tensor, cap_feats: torch.Tensor, cap_mask: torch.Tensor, t: torch.Tensor, num_tokens, transformer_options={}
|
|
) -> Tuple[torch.Tensor, torch.Tensor, List[Tuple[int, int]], List[int], torch.Tensor]:
|
|
bsz = len(x)
|
|
pH = pW = self.patch_size
|
|
device = x[0].device
|
|
|
|
if self.pad_tokens_multiple is not None:
|
|
pad_extra = (-cap_feats.shape[1]) % self.pad_tokens_multiple
|
|
cap_feats = torch.cat((cap_feats, self.cap_pad_token.to(device=cap_feats.device, dtype=cap_feats.dtype, copy=True).unsqueeze(0).repeat(cap_feats.shape[0], pad_extra, 1)), dim=1)
|
|
|
|
cap_pos_ids = torch.zeros(bsz, cap_feats.shape[1], 3, dtype=torch.float32, device=device)
|
|
cap_pos_ids[:, :, 0] = torch.arange(cap_feats.shape[1], dtype=torch.float32, device=device) + 1.0
|
|
|
|
B, C, H, W = x.shape
|
|
x = self.x_embedder(x.view(B, C, H // pH, pH, W // pW, pW).permute(0, 2, 4, 3, 5, 1).flatten(3).flatten(1, 2))
|
|
|
|
rope_options = transformer_options.get("rope_options", None)
|
|
h_scale = 1.0
|
|
w_scale = 1.0
|
|
h_start = 0
|
|
w_start = 0
|
|
if rope_options is not None:
|
|
h_scale = rope_options.get("scale_y", 1.0)
|
|
w_scale = rope_options.get("scale_x", 1.0)
|
|
|
|
h_start = rope_options.get("shift_y", 0.0)
|
|
w_start = rope_options.get("shift_x", 0.0)
|
|
|
|
H_tokens, W_tokens = H // pH, W // pW
|
|
x_pos_ids = torch.zeros((bsz, x.shape[1], 3), dtype=torch.float32, device=device)
|
|
x_pos_ids[:, :, 0] = cap_feats.shape[1] + 1
|
|
x_pos_ids[:, :, 1] = (torch.arange(H_tokens, dtype=torch.float32, device=device) * h_scale + h_start).view(-1, 1).repeat(1, W_tokens).flatten()
|
|
x_pos_ids[:, :, 2] = (torch.arange(W_tokens, dtype=torch.float32, device=device) * w_scale + w_start).view(1, -1).repeat(H_tokens, 1).flatten()
|
|
|
|
if self.pad_tokens_multiple is not None:
|
|
pad_extra = (-x.shape[1]) % self.pad_tokens_multiple
|
|
x = torch.cat((x, self.x_pad_token.to(device=x.device, dtype=x.dtype, copy=True).unsqueeze(0).repeat(x.shape[0], pad_extra, 1)), dim=1)
|
|
x_pos_ids = torch.nn.functional.pad(x_pos_ids, (0, 0, 0, pad_extra))
|
|
|
|
freqs_cis = self.rope_embedder(torch.cat((cap_pos_ids, x_pos_ids), dim=1)).movedim(1, 2)
|
|
|
|
# refine context
|
|
for layer in self.context_refiner:
|
|
cap_feats = layer(cap_feats, cap_mask, freqs_cis[:, :cap_pos_ids.shape[1]], transformer_options=transformer_options)
|
|
|
|
padded_img_mask = None
|
|
for layer in self.noise_refiner:
|
|
x = layer(x, padded_img_mask, freqs_cis[:, cap_pos_ids.shape[1]:], t, transformer_options=transformer_options)
|
|
|
|
padded_full_embed = torch.cat((cap_feats, x), dim=1)
|
|
mask = None
|
|
img_sizes = [(H, W)] * bsz
|
|
l_effective_cap_len = [cap_feats.shape[1]] * bsz
|
|
return padded_full_embed, mask, img_sizes, l_effective_cap_len, freqs_cis
|
|
|
|
def forward(self, x, timesteps, context, num_tokens, attention_mask=None, **kwargs):
|
|
return comfy.patcher_extension.WrapperExecutor.new_class_executor(
|
|
self._forward,
|
|
self,
|
|
comfy.patcher_extension.get_all_wrappers(comfy.patcher_extension.WrappersMP.DIFFUSION_MODEL, kwargs.get("transformer_options", {}))
|
|
).execute(x, timesteps, context, num_tokens, attention_mask, **kwargs)
|
|
|
|
# def forward(self, x, t, cap_feats, cap_mask):
|
|
def _forward(self, x, timesteps, context, num_tokens, attention_mask=None, **kwargs):
|
|
t = 1.0 - timesteps
|
|
cap_feats = context
|
|
cap_mask = attention_mask
|
|
bs, c, h, w = x.shape
|
|
x = comfy.ldm.common_dit.pad_to_patch_size(x, (self.patch_size, self.patch_size))
|
|
"""
|
|
Forward pass of NextDiT.
|
|
t: (N,) tensor of diffusion timesteps
|
|
y: (N,) tensor of text tokens/features
|
|
"""
|
|
|
|
t = self.t_embedder(t * self.time_scale, dtype=x.dtype) # (N, D)
|
|
adaln_input = t
|
|
|
|
cap_feats = self.cap_embedder(cap_feats) # (N, L, D) # todo check if able to batchify w.o. redundant compute
|
|
|
|
transformer_options = kwargs.get("transformer_options", {})
|
|
x_is_tensor = isinstance(x, torch.Tensor)
|
|
x, mask, img_size, cap_size, freqs_cis = self.patchify_and_embed(x, cap_feats, cap_mask, t, num_tokens, transformer_options=transformer_options)
|
|
freqs_cis = freqs_cis.to(x.device)
|
|
|
|
for layer in self.layers:
|
|
x = layer(x, mask, freqs_cis, adaln_input, transformer_options=transformer_options)
|
|
|
|
x = self.final_layer(x, adaln_input)
|
|
x = self.unpatchify(x, img_size, cap_size, return_tensor=x_is_tensor)[:,:,:h,:w]
|
|
|
|
return -x
|
|
|