def __init__(self, *args, **kwargs):

super().__init__(*args, **kwargs)

def forward(self, x):

x = x.permute(0, 2, 3, 1)

x = super().forward(x)

def __init__(self, c, c_timestep, conds=[]):

super().__init__()

self.mapper = nn.Linear(c_timestep, c * 2)

self.conds = conds

for cname in conds:

setattr(self, f"mapper_{cname}", nn.Linear(c_timestep, c * 2))

def forward(self, x, t):

t = t.chunk(len(self.conds) + 1, dim=1)

a, b = self.mapper(t[0])[:, :, None, None].chunk(2, dim=1)

for i, c in enumerate(self.conds):

ac, bc = getattr(self, f"mapper_{c}")(t[i + 1])[:, :, None, None].chunk(2, dim=1)

a, b = a + ac, b + bc

def __init__(self, c, c_skip=0, kernel_size=3, dropout=0.0):

super().__init__()

self.depthwise = nn.Conv2d(c, c, kernel_size=kernel_size, padding=kernel_size // 2, groups=c)

self.norm = SDCascadeLayerNorm(c, elementwise_affine=False, eps=1e-6)

self.channelwise = nn.Sequential(

nn.Linear(c + c_skip, c * 4),

nn.GELU(),

GlobalResponseNorm(c * 4),

nn.Dropout(dropout),

nn.Linear(c * 4, c),

)

def forward(self, x, x_skip=None):

x_res = x

x = self.norm(self.depthwise(x))

if x_skip is not None:

x = torch.cat([x, x_skip], dim=1)

x = self.channelwise(x.permute(0, 2, 3, 1)).permute(0, 3, 1, 2)

def __init__(self, dim):

super().__init__()

self.gamma = nn.Parameter(torch.zeros(1, 1, 1, dim))

self.beta = nn.Parameter(torch.zeros(1, 1, 1, dim))

def forward(self, x):

agg_norm = torch.norm(x, p=2, dim=(1, 2), keepdim=True)

stand_div_norm = agg_norm / (agg_norm.mean(dim=-1, keepdim=True) + 1e-6)

def __init__(self, c, c_cond, nhead, self_attn=True, dropout=0.0):

super().__init__()

self.self_attn = self_attn

self.norm = SDCascadeLayerNorm(c, elementwise_affine=False, eps=1e-6)

self.attention = Attention(query_dim=c, heads=nhead, dim_head=c // nhead, dropout=dropout, bias=True)

self.kv_mapper = nn.Sequential(nn.SiLU(), nn.Linear(c_cond, c))

def forward(self, x, kv):

kv = self.kv_mapper(kv)

norm_x = self.norm(x)

if self.self_attn:

batch_size, channel, _, _ = x.shape

kv = torch.cat([norm_x.view(batch_size, channel, -1).transpose(1, 2), kv], dim=1)

x = x + self.attention(norm_x, encoder_hidden_states=kv)

def __init__(self, in_channels, out_channels, mode, enabled=True):

super().__init__()

if mode not in ["up", "down"]:

raise ValueError(f"{mode} not supported")

interpolation = (

nn.Upsample(scale_factor=2 if mode == "up" else 0.5, mode="bilinear", align_corners=True)

if enabled

else nn.Identity()

)

mapping = nn.Conv2d(in_channels, out_channels, kernel_size=1)

self.blocks = nn.ModuleList([interpolation, mapping] if mode == "up" else [mapping, interpolation])

def forward(self, x):

for block in self.blocks:

x = block(x)

_supports_gradient_checkpointing = True

@register_to_config

def __init__(

self,

in_channels: int = 16,

out_channels: int = 16,

timestep_ratio_embedding_dim: int = 64,

patch_size: int = 1,

conditioning_dim: int = 2048,

block_out_channels: Tuple[int] = (2048, 2048),

num_attention_heads: Tuple[int] = (32, 32),

down_num_layers_per_block: Tuple[int] = (8, 24),

up_num_layers_per_block: Tuple[int] = (24, 8),

down_blocks_repeat_mappers: Optional[Tuple[int]] = (

1,

1,

),

up_blocks_repeat_mappers: Optional[Tuple[int]] = (1, 1),

block_types_per_layer: Tuple[Tuple[str]] = (

("SDCascadeResBlock", "SDCascadeTimestepBlock", "SDCascadeAttnBlock"),

("SDCascadeResBlock", "SDCascadeTimestepBlock", "SDCascadeAttnBlock"),

),

clip_text_in_channels: Optional[int] = None,

clip_text_pooled_in_channels=1280,

clip_image_in_channels: Optional[int] = None,

clip_seq=4,

effnet_in_channels: Optional[int] = None,

pixel_mapper_in_channels: Optional[int] = None,

kernel_size=3,

dropout: Union[float, Tuple[float]] = (0.1, 0.1),

self_attn: Union[bool, Tuple[bool]] = True,

timestep_conditioning_type: Tuple[str] = ("sca", "crp"),

switch_level: Optional[Tuple[bool]] = None,

):

"""

super().__init__()

if len(block_out_channels) != len(down_num_layers_per_block):

raise ValueError(

f"Number of elements in `down_num_layers_per_block` must match the length of `block_out_channels`: {len(block_out_channels)}"

)

elif len(block_out_channels) != len(up_num_layers_per_block):

raise ValueError(

f"Number of elements in `up_num_layers_per_block` must match the length of `block_out_channels`: {len(block_out_channels)}"

)

elif len(block_out_channels) != len(down_blocks_repeat_mappers):

raise ValueError(

f"Number of elements in `down_blocks_repeat_mappers` must match the length of `block_out_channels`: {len(block_out_channels)}"

)

elif len(block_out_channels) != len(up_blocks_repeat_mappers):

raise ValueError(

f"Number of elements in `up_blocks_repeat_mappers` must match the length of `block_out_channels`: {len(block_out_channels)}"

)

elif len(block_out_channels) != len(block_types_per_layer):

raise ValueError(

f"Number of elements in `block_types_per_layer` must match the length of `block_out_channels`: {len(block_out_channels)}"

)

if isinstance(dropout, float):

dropout = (dropout,) * len(block_out_channels)

if isinstance(self_attn, bool):

self_attn = (self_attn,) * len(block_out_channels)

# CONDITIONING

if effnet_in_channels is not None:

self.effnet_mapper = nn.Sequential(

nn.Conv2d(effnet_in_channels, block_out_channels[0] * 4, kernel_size=1),

nn.GELU(),

nn.Conv2d(block_out_channels[0] * 4, block_out_channels[0], kernel_size=1),

SDCascadeLayerNorm(block_out_channels[0], elementwise_affine=False, eps=1e-6),

)

if pixel_mapper_in_channels is not None:

self.pixels_mapper = nn.Sequential(

nn.Conv2d(pixel_mapper_in_channels, block_out_channels[0] * 4, kernel_size=1),

nn.GELU(),

nn.Conv2d(block_out_channels[0] * 4, block_out_channels[0], kernel_size=1),

SDCascadeLayerNorm(block_out_channels[0], elementwise_affine=False, eps=1e-6),

)

self.clip_txt_pooled_mapper = nn.Linear(clip_text_pooled_in_channels, conditioning_dim * clip_seq)

if clip_text_in_channels is not None:

self.clip_txt_mapper = nn.Linear(clip_text_in_channels, conditioning_dim)

if clip_image_in_channels is not None:

self.clip_img_mapper = nn.Linear(clip_image_in_channels, conditioning_dim * clip_seq)

self.clip_norm = nn.LayerNorm(conditioning_dim, elementwise_affine=False, eps=1e-6)

self.embedding = nn.Sequential(

nn.PixelUnshuffle(patch_size),

nn.Conv2d(in_channels * (patch_size**2), block_out_channels[0], kernel_size=1),

SDCascadeLayerNorm(block_out_channels[0], elementwise_affine=False, eps=1e-6),

)

def get_block(block_type, in_channels, nhead, c_skip=0, dropout=0, self_attn=True):

if block_type == "SDCascadeResBlock":

return SDCascadeResBlock(in_channels, c_skip, kernel_size=kernel_size, dropout=dropout)

elif block_type == "SDCascadeAttnBlock":

return SDCascadeAttnBlock(in_channels, conditioning_dim, nhead, self_attn=self_attn, dropout=dropout)

elif block_type == "SDCascadeTimestepBlock":

return SDCascadeTimestepBlock(

in_channels, timestep_ratio_embedding_dim, conds=timestep_conditioning_type

)

else:

raise ValueError(f"Block type {block_type} not supported")

# BLOCKS

# -- down blocks

self.down_blocks = nn.ModuleList()

self.down_downscalers = nn.ModuleList()

self.down_repeat_mappers = nn.ModuleList()

for i in range(len(block_out_channels)):

if i > 0:

self.down_downscalers.append(

nn.Sequential(

SDCascadeLayerNorm(block_out_channels[i - 1], elementwise_affine=False, eps=1e-6),

UpDownBlock2d(

block_out_channels[i - 1], block_out_channels[i], mode="down", enabled=switch_level[i - 1]

)

if switch_level is not None

else nn.Conv2d(block_out_channels[i - 1], block_out_channels[i], kernel_size=2, stride=2),

)

)

else:

self.down_downscalers.append(nn.Identity())

down_block = nn.ModuleList()

for _ in range(down_num_layers_per_block[i]):

for block_type in block_types_per_layer[i]:

block = get_block(

block_type,

block_out_channels[i],

num_attention_heads[i],

dropout=dropout[i],

self_attn=self_attn[i],

)

down_block.append(block)

self.down_blocks.append(down_block)

if down_blocks_repeat_mappers is not None:

block_repeat_mappers = nn.ModuleList()

for _ in range(down_blocks_repeat_mappers[i] - 1):

block_repeat_mappers.append(nn.Conv2d(block_out_channels[i], block_out_channels[i], kernel_size=1))

self.down_repeat_mappers.append(block_repeat_mappers)

# -- up blocks

self.up_blocks = nn.ModuleList()

self.up_upscalers = nn.ModuleList()

self.up_repeat_mappers = nn.ModuleList()

for i in reversed(range(len(block_out_channels))):

if i > 0:

self.up_upscalers.append(

nn.Sequential(

SDCascadeLayerNorm(block_out_channels[i], elementwise_affine=False, eps=1e-6),

UpDownBlock2d(

block_out_channels[i], block_out_channels[i - 1], mode="up", enabled=switch_level[i - 1]

)

if switch_level is not None

else nn.ConvTranspose2d(

block_out_channels[i], block_out_channels[i - 1], kernel_size=2, stride=2

),

)

)

else:

self.up_upscalers.append(nn.Identity())

up_block = nn.ModuleList()

for j in range(up_num_layers_per_block[::-1][i]):

for k, block_type in enumerate(block_types_per_layer[i]):

c_skip = block_out_channels[i] if i < len(block_out_channels) - 1 and j == k == 0 else 0

block = get_block(

block_type,

block_out_channels[i],

num_attention_heads[i],

c_skip=c_skip,

dropout=dropout[i],

self_attn=self_attn[i],

)

up_block.append(block)

self.up_blocks.append(up_block)

if up_blocks_repeat_mappers is not None:

block_repeat_mappers = nn.ModuleList()

for _ in range(up_blocks_repeat_mappers[::-1][i] - 1):

block_repeat_mappers.append(nn.Conv2d(block_out_channels[i], block_out_channels[i], kernel_size=1))

self.up_repeat_mappers.append(block_repeat_mappers)

# OUTPUT

self.clf = nn.Sequential(

SDCascadeLayerNorm(block_out_channels[0], elementwise_affine=False, eps=1e-6),

nn.Conv2d(block_out_channels[0], out_channels * (patch_size**2), kernel_size=1),

nn.PixelShuffle(patch_size),

)

self.gradient_checkpointing = False

def _set_gradient_checkpointing(self, value=False):

self.gradient_checkpointing = value

def _init_weights(self, m):

if isinstance(m, (nn.Conv2d, nn.Linear)):

torch.nn.init.xavier_uniform_(m.weight)

if m.bias is not None:

nn.init.constant_(m.bias, 0)

nn.init.normal_(self.clip_txt_pooled_mapper.weight, std=0.02)

nn.init.normal_(self.clip_txt_mapper.weight, std=0.02) if hasattr(self, "clip_txt_mapper") else None

nn.init.normal_(self.clip_img_mapper.weight, std=0.02) if hasattr(self, "clip_img_mapper") else None

if hasattr(self, "effnet_mapper"):

nn.init.normal_(self.effnet_mapper[0].weight, std=0.02) # conditionings

nn.init.normal_(self.effnet_mapper[2].weight, std=0.02) # conditionings

if hasattr(self, "pixels_mapper"):

nn.init.normal_(self.pixels_mapper[0].weight, std=0.02) # conditionings

nn.init.normal_(self.pixels_mapper[2].weight, std=0.02) # conditionings

torch.nn.init.xavier_uniform_(self.embedding[1].weight, 0.02) # inputs

nn.init.constant_(self.clf[1].weight, 0) # outputs

# blocks

for level_block in self.down_blocks + self.up_blocks:

for block in level_block:

if isinstance(block, SDCascadeResBlock):

block.channelwise[-1].weight.data *= np.sqrt(1 / sum(self.config.blocks[0]))

elif isinstance(block, SDCascadeTimestepBlock):

nn.init.constant_(block.mapper.weight, 0)

def get_timestep_ratio_embedding(self, timestep_ratio, max_positions=10000):

r = timestep_ratio * max_positions

half_dim = self.config.timestep_ratio_embedding_dim // 2

emb = math.log(max_positions) / (half_dim - 1)

emb = torch.arange(half_dim, device=r.device).float().mul(-emb).exp()

emb = r[:, None] * emb[None, :]

emb = torch.cat([emb.sin(), emb.cos()], dim=1)

if self.config.timestep_ratio_embedding_dim % 2 == 1: # zero pad

emb = nn.functional.pad(emb, (0, 1), mode="constant")

return emb.to(dtype=r.dtype)

def get_clip_embeddings(self, clip_txt_pooled, clip_txt=None, clip_img=None):

if len(clip_txt_pooled.shape) == 2:

clip_txt_pool = clip_txt_pooled.unsqueeze(1)

clip_txt_pool = self.clip_txt_pooled_mapper(clip_txt_pooled).view(

clip_txt_pooled.size(0), clip_txt_pooled.size(1) * self.config.clip_seq, -1

)

if clip_txt is not None and clip_img is not None:

clip_txt = self.clip_txt_mapper(clip_txt)

if len(clip_img.shape) == 2:

clip_img = clip_img.unsqueeze(1)

clip_img = self.clip_img_mapper(clip_img).view(

clip_img.size(0), clip_img.size(1) * self.config.clip_seq, -1

)

clip = torch.cat([clip_txt, clip_txt_pool, clip_img], dim=1)

else:

clip = clip_txt_pool

return self.clip_norm(clip)

def _down_encode(self, x, r_embed, clip):

level_outputs = []

block_group = zip(self.down_blocks, self.down_downscalers, self.down_repeat_mappers)

if torch.is_grad_enabled() and self.gradient_checkpointing:

def create_custom_forward(module):

def custom_forward(*inputs):

return module(*inputs)

return custom_forward

for down_block, downscaler, repmap in block_group:

x = downscaler(x)

for i in range(len(repmap) + 1):

for block in down_block:

if isinstance(block, SDCascadeResBlock):

x = torch.utils.checkpoint.checkpoint(create_custom_forward(block), x, use_reentrant=False)

elif isinstance(block, SDCascadeAttnBlock):

x = torch.utils.checkpoint.checkpoint(

create_custom_forward(block), x, clip, use_reentrant=False

)

elif isinstance(block, SDCascadeTimestepBlock):

x = torch.utils.checkpoint.checkpoint(

create_custom_forward(block), x, r_embed, use_reentrant=False

)

else:

x = torch.utils.checkpoint.checkpoint(create_custom_forward(block), use_reentrant=False)

if i < len(repmap):

x = repmap[i](x)

level_outputs.insert(0, x)

else:

for down_block, downscaler, repmap in block_group:

x = downscaler(x)

for i in range(len(repmap) + 1):

for block in down_block:

if isinstance(block, SDCascadeResBlock):

x = block(x)

elif isinstance(block, SDCascadeAttnBlock):

x = block(x, clip)

elif isinstance(block, SDCascadeTimestepBlock):

x = block(x, r_embed)

else:

x = block(x)

if i < len(repmap):

x = repmap[i](x)

level_outputs.insert(0, x)

return level_outputs

def _up_decode(self, level_outputs, r_embed, clip):

x = level_outputs[0]

block_group = zip(self.up_blocks, self.up_upscalers, self.up_repeat_mappers)

if torch.is_grad_enabled() and self.gradient_checkpointing:

def create_custom_forward(module):

def custom_forward(*inputs):

return module(*inputs)

return custom_forward

for i, (up_block, upscaler, repmap) in enumerate(block_group):

for j in range(len(repmap) + 1):

for k, block in enumerate(up_block):

if isinstance(block, SDCascadeResBlock):

skip = level_outputs[i] if k == 0 and i > 0 else None

if skip is not None and (x.size(-1) != skip.size(-1) or x.size(-2) != skip.size(-2)):

orig_type = x.dtype

x = torch.nn.functional.interpolate(

x.float(), skip.shape[-2:], mode="bilinear", align_corners=True

)

x = x.to(orig_type)

x = torch.utils.checkpoint.checkpoint(

create_custom_forward(block), x, skip, use_reentrant=False

)

elif isinstance(block, SDCascadeAttnBlock):

x = torch.utils.checkpoint.checkpoint(

create_custom_forward(block), x, clip, use_reentrant=False

)

elif isinstance(block, SDCascadeTimestepBlock):

x = torch.utils.checkpoint.checkpoint(

create_custom_forward(block), x, r_embed, use_reentrant=False

)

else:

x = torch.utils.checkpoint.checkpoint(create_custom_forward(block), x, use_reentrant=False)

if j < len(repmap):

x = repmap[j](x)

x = upscaler(x)

else:

for i, (up_block, upscaler, repmap) in enumerate(block_group):

for j in range(len(repmap) + 1):

for k, block in enumerate(up_block):

if isinstance(block, SDCascadeResBlock):

skip = level_outputs[i] if k == 0 and i > 0 else None

if skip is not None and (x.size(-1) != skip.size(-1) or x.size(-2) != skip.size(-2)):

orig_type = x.dtype

x = torch.nn.functional.interpolate(

x.float(), skip.shape[-2:], mode="bilinear", align_corners=True

)

x = x.to(orig_type)

x = block(x, skip)

elif isinstance(block, SDCascadeAttnBlock):

x = block(x, clip)

elif isinstance(block, SDCascadeTimestepBlock):

x = block(x, r_embed)

else:

x = block(x)

if j < len(repmap):

x = repmap[j](x)

x = upscaler(x)

return x

def forward(

self,

sample,

timestep_ratio,

clip_text_pooled,

clip_text=None,

clip_img=None,

effnet=None,

pixels=None,

sca=None,

crp=None,

return_dict=True,

):

if pixels is None:

pixels = sample.new_zeros(sample.size(0), 3, 8, 8)

# Process the conditioning embeddings

timestep_ratio_embed = self.get_timestep_ratio_embedding(timestep_ratio)

for c in self.config.timestep_conditioning_type:

if c == "sca":

cond = sca

elif c == "crp":

cond = crp

else:

cond = None

t_cond = cond or torch.zeros_like(timestep_ratio)

timestep_ratio_embed = torch.cat([timestep_ratio_embed, self.get_timestep_ratio_embedding(t_cond)], dim=1)

clip = self.get_clip_embeddings(clip_txt_pooled=clip_text_pooled, clip_txt=clip_text, clip_img=clip_img)

# Model Blocks

x = self.embedding(sample)

if hasattr(self, "effnet_mapper") and effnet is not None:

x = x + self.effnet_mapper(

nn.functional.interpolate(effnet, size=x.shape[-2:], mode="bilinear", align_corners=True)

)

if hasattr(self, "pixels_mapper"):

x = x + nn.functional.interpolate(

self.pixels_mapper(pixels), size=x.shape[-2:], mode="bilinear", align_corners=True

)

level_outputs = self._down_encode(x, timestep_ratio_embed, clip)

x = self._up_decode(level_outputs, timestep_ratio_embed, clip)

sample = self.clf(x)

if not return_dict:

return (sample,)