mirror of
https://github.com/lllyasviel/stable-diffusion-webui-forge.git
synced 2026-04-29 18:51:31 +00:00
Use Spandrel for upscaling and face restoration architectures (aside from GFPGAN and LDSR)
This commit is contained in:
Aarni Koskela
@@ -7,9 +7,7 @@ from tqdm import tqdm
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import modules.upscaler
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from modules import devices, modelloader, script_callbacks, errors
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from scunet_model_arch import SCUNet
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from modules.modelloader import load_file_from_url
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from modules.shared import opts
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@@ -120,17 +118,10 @@ class UpscalerScuNET(modules.upscaler.Upscaler):
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device = devices.get_device_for('scunet')
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if path.startswith("http"):
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# TODO: this doesn't use `path` at all?
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filename = load_file_from_url(self.model_url, model_dir=self.model_download_path, file_name=f"{self.name}.pth")
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filename = modelloader.load_file_from_url(self.model_url, model_dir=self.model_download_path, file_name=f"{self.name}.pth")
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else:
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filename = path
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model = SCUNet(in_nc=3, config=[4, 4, 4, 4, 4, 4, 4], dim=64)
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model.load_state_dict(torch.load(filename), strict=True)
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model.eval()
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for _, v in model.named_parameters():
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v.requires_grad = False
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model = model.to(device)
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return model
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return modelloader.load_spandrel_model(filename, device=device)
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def on_ui_settings():
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@@ -1,268 +0,0 @@
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# -*- coding: utf-8 -*-
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import numpy as np
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import torch
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import torch.nn as nn
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from einops import rearrange
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from einops.layers.torch import Rearrange
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from timm.models.layers import trunc_normal_, DropPath
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class WMSA(nn.Module):
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""" Self-attention module in Swin Transformer
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"""
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def __init__(self, input_dim, output_dim, head_dim, window_size, type):
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super(WMSA, self).__init__()
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self.input_dim = input_dim
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self.output_dim = output_dim
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self.head_dim = head_dim
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self.scale = self.head_dim ** -0.5
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self.n_heads = input_dim // head_dim
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self.window_size = window_size
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self.type = type
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self.embedding_layer = nn.Linear(self.input_dim, 3 * self.input_dim, bias=True)
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self.relative_position_params = nn.Parameter(
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torch.zeros((2 * window_size - 1) * (2 * window_size - 1), self.n_heads))
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self.linear = nn.Linear(self.input_dim, self.output_dim)
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trunc_normal_(self.relative_position_params, std=.02)
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self.relative_position_params = torch.nn.Parameter(
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self.relative_position_params.view(2 * window_size - 1, 2 * window_size - 1, self.n_heads).transpose(1,
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2).transpose(
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0, 1))
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def generate_mask(self, h, w, p, shift):
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""" generating the mask of SW-MSA
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Args:
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shift: shift parameters in CyclicShift.
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Returns:
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attn_mask: should be (1 1 w p p),
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"""
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# supporting square.
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attn_mask = torch.zeros(h, w, p, p, p, p, dtype=torch.bool, device=self.relative_position_params.device)
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if self.type == 'W':
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return attn_mask
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s = p - shift
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attn_mask[-1, :, :s, :, s:, :] = True
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attn_mask[-1, :, s:, :, :s, :] = True
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attn_mask[:, -1, :, :s, :, s:] = True
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attn_mask[:, -1, :, s:, :, :s] = True
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attn_mask = rearrange(attn_mask, 'w1 w2 p1 p2 p3 p4 -> 1 1 (w1 w2) (p1 p2) (p3 p4)')
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return attn_mask
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def forward(self, x):
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""" Forward pass of Window Multi-head Self-attention module.
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Args:
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x: input tensor with shape of [b h w c];
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attn_mask: attention mask, fill -inf where the value is True;
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Returns:
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output: tensor shape [b h w c]
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"""
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if self.type != 'W':
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x = torch.roll(x, shifts=(-(self.window_size // 2), -(self.window_size // 2)), dims=(1, 2))
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x = rearrange(x, 'b (w1 p1) (w2 p2) c -> b w1 w2 p1 p2 c', p1=self.window_size, p2=self.window_size)
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h_windows = x.size(1)
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w_windows = x.size(2)
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# square validation
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# assert h_windows == w_windows
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x = rearrange(x, 'b w1 w2 p1 p2 c -> b (w1 w2) (p1 p2) c', p1=self.window_size, p2=self.window_size)
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qkv = self.embedding_layer(x)
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q, k, v = rearrange(qkv, 'b nw np (threeh c) -> threeh b nw np c', c=self.head_dim).chunk(3, dim=0)
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sim = torch.einsum('hbwpc,hbwqc->hbwpq', q, k) * self.scale
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# Adding learnable relative embedding
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sim = sim + rearrange(self.relative_embedding(), 'h p q -> h 1 1 p q')
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# Using Attn Mask to distinguish different subwindows.
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if self.type != 'W':
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attn_mask = self.generate_mask(h_windows, w_windows, self.window_size, shift=self.window_size // 2)
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sim = sim.masked_fill_(attn_mask, float("-inf"))
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probs = nn.functional.softmax(sim, dim=-1)
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output = torch.einsum('hbwij,hbwjc->hbwic', probs, v)
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output = rearrange(output, 'h b w p c -> b w p (h c)')
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output = self.linear(output)
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output = rearrange(output, 'b (w1 w2) (p1 p2) c -> b (w1 p1) (w2 p2) c', w1=h_windows, p1=self.window_size)
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if self.type != 'W':
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output = torch.roll(output, shifts=(self.window_size // 2, self.window_size // 2), dims=(1, 2))
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return output
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def relative_embedding(self):
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cord = torch.tensor(np.array([[i, j] for i in range(self.window_size) for j in range(self.window_size)]))
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relation = cord[:, None, :] - cord[None, :, :] + self.window_size - 1
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# negative is allowed
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return self.relative_position_params[:, relation[:, :, 0].long(), relation[:, :, 1].long()]
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class Block(nn.Module):
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def __init__(self, input_dim, output_dim, head_dim, window_size, drop_path, type='W', input_resolution=None):
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""" SwinTransformer Block
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"""
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super(Block, self).__init__()
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self.input_dim = input_dim
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self.output_dim = output_dim
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assert type in ['W', 'SW']
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self.type = type
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if input_resolution <= window_size:
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self.type = 'W'
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self.ln1 = nn.LayerNorm(input_dim)
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self.msa = WMSA(input_dim, input_dim, head_dim, window_size, self.type)
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self.drop_path = DropPath(drop_path) if drop_path > 0. else nn.Identity()
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self.ln2 = nn.LayerNorm(input_dim)
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self.mlp = nn.Sequential(
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nn.Linear(input_dim, 4 * input_dim),
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nn.GELU(),
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nn.Linear(4 * input_dim, output_dim),
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)
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def forward(self, x):
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x = x + self.drop_path(self.msa(self.ln1(x)))
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x = x + self.drop_path(self.mlp(self.ln2(x)))
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return x
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class ConvTransBlock(nn.Module):
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def __init__(self, conv_dim, trans_dim, head_dim, window_size, drop_path, type='W', input_resolution=None):
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""" SwinTransformer and Conv Block
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"""
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super(ConvTransBlock, self).__init__()
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self.conv_dim = conv_dim
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self.trans_dim = trans_dim
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self.head_dim = head_dim
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self.window_size = window_size
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self.drop_path = drop_path
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self.type = type
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self.input_resolution = input_resolution
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assert self.type in ['W', 'SW']
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if self.input_resolution <= self.window_size:
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self.type = 'W'
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self.trans_block = Block(self.trans_dim, self.trans_dim, self.head_dim, self.window_size, self.drop_path,
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self.type, self.input_resolution)
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self.conv1_1 = nn.Conv2d(self.conv_dim + self.trans_dim, self.conv_dim + self.trans_dim, 1, 1, 0, bias=True)
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self.conv1_2 = nn.Conv2d(self.conv_dim + self.trans_dim, self.conv_dim + self.trans_dim, 1, 1, 0, bias=True)
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self.conv_block = nn.Sequential(
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nn.Conv2d(self.conv_dim, self.conv_dim, 3, 1, 1, bias=False),
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nn.ReLU(True),
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nn.Conv2d(self.conv_dim, self.conv_dim, 3, 1, 1, bias=False)
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)
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def forward(self, x):
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conv_x, trans_x = torch.split(self.conv1_1(x), (self.conv_dim, self.trans_dim), dim=1)
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conv_x = self.conv_block(conv_x) + conv_x
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trans_x = Rearrange('b c h w -> b h w c')(trans_x)
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trans_x = self.trans_block(trans_x)
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trans_x = Rearrange('b h w c -> b c h w')(trans_x)
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res = self.conv1_2(torch.cat((conv_x, trans_x), dim=1))
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x = x + res
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return x
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class SCUNet(nn.Module):
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# def __init__(self, in_nc=3, config=[2, 2, 2, 2, 2, 2, 2], dim=64, drop_path_rate=0.0, input_resolution=256):
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def __init__(self, in_nc=3, config=None, dim=64, drop_path_rate=0.0, input_resolution=256):
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super(SCUNet, self).__init__()
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if config is None:
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config = [2, 2, 2, 2, 2, 2, 2]
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self.config = config
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self.dim = dim
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self.head_dim = 32
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self.window_size = 8
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# drop path rate for each layer
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dpr = [x.item() for x in torch.linspace(0, drop_path_rate, sum(config))]
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self.m_head = [nn.Conv2d(in_nc, dim, 3, 1, 1, bias=False)]
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begin = 0
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self.m_down1 = [ConvTransBlock(dim // 2, dim // 2, self.head_dim, self.window_size, dpr[i + begin],
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'W' if not i % 2 else 'SW', input_resolution)
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for i in range(config[0])] + \
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[nn.Conv2d(dim, 2 * dim, 2, 2, 0, bias=False)]
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begin += config[0]
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self.m_down2 = [ConvTransBlock(dim, dim, self.head_dim, self.window_size, dpr[i + begin],
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'W' if not i % 2 else 'SW', input_resolution // 2)
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for i in range(config[1])] + \
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[nn.Conv2d(2 * dim, 4 * dim, 2, 2, 0, bias=False)]
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begin += config[1]
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self.m_down3 = [ConvTransBlock(2 * dim, 2 * dim, self.head_dim, self.window_size, dpr[i + begin],
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'W' if not i % 2 else 'SW', input_resolution // 4)
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for i in range(config[2])] + \
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[nn.Conv2d(4 * dim, 8 * dim, 2, 2, 0, bias=False)]
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begin += config[2]
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self.m_body = [ConvTransBlock(4 * dim, 4 * dim, self.head_dim, self.window_size, dpr[i + begin],
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'W' if not i % 2 else 'SW', input_resolution // 8)
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for i in range(config[3])]
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begin += config[3]
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self.m_up3 = [nn.ConvTranspose2d(8 * dim, 4 * dim, 2, 2, 0, bias=False), ] + \
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[ConvTransBlock(2 * dim, 2 * dim, self.head_dim, self.window_size, dpr[i + begin],
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'W' if not i % 2 else 'SW', input_resolution // 4)
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for i in range(config[4])]
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begin += config[4]
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self.m_up2 = [nn.ConvTranspose2d(4 * dim, 2 * dim, 2, 2, 0, bias=False), ] + \
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[ConvTransBlock(dim, dim, self.head_dim, self.window_size, dpr[i + begin],
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'W' if not i % 2 else 'SW', input_resolution // 2)
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for i in range(config[5])]
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begin += config[5]
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self.m_up1 = [nn.ConvTranspose2d(2 * dim, dim, 2, 2, 0, bias=False), ] + \
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[ConvTransBlock(dim // 2, dim // 2, self.head_dim, self.window_size, dpr[i + begin],
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'W' if not i % 2 else 'SW', input_resolution)
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for i in range(config[6])]
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self.m_tail = [nn.Conv2d(dim, in_nc, 3, 1, 1, bias=False)]
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self.m_head = nn.Sequential(*self.m_head)
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self.m_down1 = nn.Sequential(*self.m_down1)
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self.m_down2 = nn.Sequential(*self.m_down2)
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self.m_down3 = nn.Sequential(*self.m_down3)
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self.m_body = nn.Sequential(*self.m_body)
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self.m_up3 = nn.Sequential(*self.m_up3)
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self.m_up2 = nn.Sequential(*self.m_up2)
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self.m_up1 = nn.Sequential(*self.m_up1)
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self.m_tail = nn.Sequential(*self.m_tail)
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# self.apply(self._init_weights)
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def forward(self, x0):
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h, w = x0.size()[-2:]
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paddingBottom = int(np.ceil(h / 64) * 64 - h)
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paddingRight = int(np.ceil(w / 64) * 64 - w)
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x0 = nn.ReplicationPad2d((0, paddingRight, 0, paddingBottom))(x0)
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x1 = self.m_head(x0)
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x2 = self.m_down1(x1)
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x3 = self.m_down2(x2)
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x4 = self.m_down3(x3)
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x = self.m_body(x4)
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x = self.m_up3(x + x4)
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x = self.m_up2(x + x3)
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x = self.m_up1(x + x2)
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x = self.m_tail(x + x1)
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x = x[..., :h, :w]
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return x
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def _init_weights(self, m):
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if isinstance(m, nn.Linear):
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trunc_normal_(m.weight, std=.02)
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if m.bias is not None:
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nn.init.constant_(m.bias, 0)
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elif isinstance(m, nn.LayerNorm):
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nn.init.constant_(m.bias, 0)
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nn.init.constant_(m.weight, 1.0)
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@@ -1,5 +1,5 @@
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import logging
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import sys
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import platform
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import numpy as np
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import torch
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@@ -8,13 +8,11 @@ from tqdm import tqdm
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from modules import modelloader, devices, script_callbacks, shared
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from modules.shared import opts, state
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from swinir_model_arch import SwinIR
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from swinir_model_arch_v2 import Swin2SR
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from modules.upscaler import Upscaler, UpscalerData
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SWINIR_MODEL_URL = "https://github.com/JingyunLiang/SwinIR/releases/download/v0.0/003_realSR_BSRGAN_DFOWMFC_s64w8_SwinIR-L_x4_GAN.pth"
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device_swinir = devices.get_device_for('swinir')
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logger = logging.getLogger(__name__)
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class UpscalerSwinIR(Upscaler):
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@@ -37,26 +35,29 @@ class UpscalerSwinIR(Upscaler):
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scalers.append(model_data)
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self.scalers = scalers
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def do_upscale(self, img, model_file):
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use_compile = hasattr(opts, 'SWIN_torch_compile') and opts.SWIN_torch_compile \
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and int(torch.__version__.split('.')[0]) >= 2 and platform.system() != "Windows"
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def do_upscale(self, img: Image.Image, model_file: str) -> Image.Image:
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current_config = (model_file, opts.SWIN_tile)
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if use_compile and self._cached_model_config == current_config:
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device = self._get_device()
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if self._cached_model_config == current_config:
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model = self._cached_model
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else:
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self._cached_model = None
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try:
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model = self.load_model(model_file)
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except Exception as e:
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print(f"Failed loading SwinIR model {model_file}: {e}", file=sys.stderr)
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return img
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model = model.to(device_swinir, dtype=devices.dtype)
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if use_compile:
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model = torch.compile(model)
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self._cached_model = model
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self._cached_model_config = current_config
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img = upscale(img, model)
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self._cached_model = model
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self._cached_model_config = current_config
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img = upscale(
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img,
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model,
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tile=opts.SWIN_tile,
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tile_overlap=opts.SWIN_tile_overlap,
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device=device,
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)
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devices.torch_gc()
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return img
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@@ -69,69 +70,54 @@ class UpscalerSwinIR(Upscaler):
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)
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else:
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filename = path
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if filename.endswith(".v2.pth"):
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model = Swin2SR(
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upscale=scale,
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in_chans=3,
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img_size=64,
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window_size=8,
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img_range=1.0,
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depths=[6, 6, 6, 6, 6, 6],
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embed_dim=180,
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num_heads=[6, 6, 6, 6, 6, 6],
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mlp_ratio=2,
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upsampler="nearest+conv",
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resi_connection="1conv",
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)
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params = None
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else:
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model = SwinIR(
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upscale=scale,
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in_chans=3,
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img_size=64,
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window_size=8,
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img_range=1.0,
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depths=[6, 6, 6, 6, 6, 6, 6, 6, 6],
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embed_dim=240,
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num_heads=[8, 8, 8, 8, 8, 8, 8, 8, 8],
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mlp_ratio=2,
|
||||
upsampler="nearest+conv",
|
||||
resi_connection="3conv",
|
||||
)
|
||||
params = "params_ema"
|
||||
|
||||
pretrained_model = torch.load(filename)
|
||||
if params is not None:
|
||||
model.load_state_dict(pretrained_model[params], strict=True)
|
||||
else:
|
||||
model.load_state_dict(pretrained_model, strict=True)
|
||||
model = modelloader.load_spandrel_model(
|
||||
filename,
|
||||
device=self._get_device(),
|
||||
dtype=devices.dtype,
|
||||
)
|
||||
if getattr(opts, 'SWIN_torch_compile', False):
|
||||
try:
|
||||
model = torch.compile(model)
|
||||
except Exception:
|
||||
logger.warning("Failed to compile SwinIR model, fallback to JIT", exc_info=True)
|
||||
return model
|
||||
|
||||
def _get_device(self):
|
||||
return devices.get_device_for('swinir')
|
||||
|
||||
|
||||
def upscale(
|
||||
img,
|
||||
model,
|
||||
tile=None,
|
||||
tile_overlap=None,
|
||||
window_size=8,
|
||||
scale=4,
|
||||
img,
|
||||
model,
|
||||
*,
|
||||
tile: int,
|
||||
tile_overlap: int,
|
||||
window_size=8,
|
||||
scale=4,
|
||||
device,
|
||||
):
|
||||
tile = tile or opts.SWIN_tile
|
||||
tile_overlap = tile_overlap or opts.SWIN_tile_overlap
|
||||
|
||||
|
||||
img = np.array(img)
|
||||
img = img[:, :, ::-1]
|
||||
img = np.moveaxis(img, 2, 0) / 255
|
||||
img = torch.from_numpy(img).float()
|
||||
img = img.unsqueeze(0).to(device_swinir, dtype=devices.dtype)
|
||||
img = img.unsqueeze(0).to(device, dtype=devices.dtype)
|
||||
with torch.no_grad(), devices.autocast():
|
||||
_, _, h_old, w_old = img.size()
|
||||
h_pad = (h_old // window_size + 1) * window_size - h_old
|
||||
w_pad = (w_old // window_size + 1) * window_size - w_old
|
||||
img = torch.cat([img, torch.flip(img, [2])], 2)[:, :, : h_old + h_pad, :]
|
||||
img = torch.cat([img, torch.flip(img, [3])], 3)[:, :, :, : w_old + w_pad]
|
||||
output = inference(img, model, tile, tile_overlap, window_size, scale)
|
||||
output = inference(
|
||||
img,
|
||||
model,
|
||||
tile=tile,
|
||||
tile_overlap=tile_overlap,
|
||||
window_size=window_size,
|
||||
scale=scale,
|
||||
device=device,
|
||||
)
|
||||
output = output[..., : h_old * scale, : w_old * scale]
|
||||
output = output.data.squeeze().float().cpu().clamp_(0, 1).numpy()
|
||||
if output.ndim == 3:
|
||||
@@ -142,7 +128,16 @@ def upscale(
|
||||
return Image.fromarray(output, "RGB")
|
||||
|
||||
|
||||
def inference(img, model, tile, tile_overlap, window_size, scale):
|
||||
def inference(
|
||||
img,
|
||||
model,
|
||||
*,
|
||||
tile: int,
|
||||
tile_overlap: int,
|
||||
window_size: int,
|
||||
scale: int,
|
||||
device,
|
||||
):
|
||||
# test the image tile by tile
|
||||
b, c, h, w = img.size()
|
||||
tile = min(tile, h, w)
|
||||
@@ -152,8 +147,8 @@ def inference(img, model, tile, tile_overlap, window_size, scale):
|
||||
stride = tile - tile_overlap
|
||||
h_idx_list = list(range(0, h - tile, stride)) + [h - tile]
|
||||
w_idx_list = list(range(0, w - tile, stride)) + [w - tile]
|
||||
E = torch.zeros(b, c, h * sf, w * sf, dtype=devices.dtype, device=device_swinir).type_as(img)
|
||||
W = torch.zeros_like(E, dtype=devices.dtype, device=device_swinir)
|
||||
E = torch.zeros(b, c, h * sf, w * sf, dtype=devices.dtype, device=device).type_as(img)
|
||||
W = torch.zeros_like(E, dtype=devices.dtype, device=device)
|
||||
|
||||
with tqdm(total=len(h_idx_list) * len(w_idx_list), desc="SwinIR tiles") as pbar:
|
||||
for h_idx in h_idx_list:
|
||||
@@ -185,8 +180,7 @@ def on_ui_settings():
|
||||
|
||||
shared.opts.add_option("SWIN_tile", shared.OptionInfo(192, "Tile size for all SwinIR.", gr.Slider, {"minimum": 16, "maximum": 512, "step": 16}, section=('upscaling', "Upscaling")))
|
||||
shared.opts.add_option("SWIN_tile_overlap", shared.OptionInfo(8, "Tile overlap, in pixels for SwinIR. Low values = visible seam.", gr.Slider, {"minimum": 0, "maximum": 48, "step": 1}, section=('upscaling', "Upscaling")))
|
||||
if int(torch.__version__.split('.')[0]) >= 2 and platform.system() != "Windows": # torch.compile() require pytorch 2.0 or above, and not on Windows
|
||||
shared.opts.add_option("SWIN_torch_compile", shared.OptionInfo(False, "Use torch.compile to accelerate SwinIR.", gr.Checkbox, {"interactive": True}, section=('upscaling', "Upscaling")).info("Takes longer on first run"))
|
||||
shared.opts.add_option("SWIN_torch_compile", shared.OptionInfo(False, "Use torch.compile to accelerate SwinIR.", gr.Checkbox, {"interactive": True}, section=('upscaling', "Upscaling")).info("Takes longer on first run"))
|
||||
|
||||
|
||||
script_callbacks.on_ui_settings(on_ui_settings)
|
||||
|
||||
@@ -1,867 +0,0 @@
|
||||
# -----------------------------------------------------------------------------------
|
||||
# SwinIR: Image Restoration Using Swin Transformer, https://arxiv.org/abs/2108.10257
|
||||
# Originally Written by Ze Liu, Modified by Jingyun Liang.
|
||||
# -----------------------------------------------------------------------------------
|
||||
|
||||
import math
|
||||
import torch
|
||||
import torch.nn as nn
|
||||
import torch.nn.functional as F
|
||||
import torch.utils.checkpoint as checkpoint
|
||||
from timm.models.layers import DropPath, to_2tuple, trunc_normal_
|
||||
|
||||
|
||||
class Mlp(nn.Module):
|
||||
def __init__(self, in_features, hidden_features=None, out_features=None, act_layer=nn.GELU, drop=0.):
|
||||
super().__init__()
|
||||
out_features = out_features or in_features
|
||||
hidden_features = hidden_features or in_features
|
||||
self.fc1 = nn.Linear(in_features, hidden_features)
|
||||
self.act = act_layer()
|
||||
self.fc2 = nn.Linear(hidden_features, out_features)
|
||||
self.drop = nn.Dropout(drop)
|
||||
|
||||
def forward(self, x):
|
||||
x = self.fc1(x)
|
||||
x = self.act(x)
|
||||
x = self.drop(x)
|
||||
x = self.fc2(x)
|
||||
x = self.drop(x)
|
||||
return x
|
||||
|
||||
|
||||
def window_partition(x, window_size):
|
||||
"""
|
||||
Args:
|
||||
x: (B, H, W, C)
|
||||
window_size (int): window size
|
||||
|
||||
Returns:
|
||||
windows: (num_windows*B, window_size, window_size, C)
|
||||
"""
|
||||
B, H, W, C = x.shape
|
||||
x = x.view(B, H // window_size, window_size, W // window_size, window_size, C)
|
||||
windows = x.permute(0, 1, 3, 2, 4, 5).contiguous().view(-1, window_size, window_size, C)
|
||||
return windows
|
||||
|
||||
|
||||
def window_reverse(windows, window_size, H, W):
|
||||
"""
|
||||
Args:
|
||||
windows: (num_windows*B, window_size, window_size, C)
|
||||
window_size (int): Window size
|
||||
H (int): Height of image
|
||||
W (int): Width of image
|
||||
|
||||
Returns:
|
||||
x: (B, H, W, C)
|
||||
"""
|
||||
B = int(windows.shape[0] / (H * W / window_size / window_size))
|
||||
x = windows.view(B, H // window_size, W // window_size, window_size, window_size, -1)
|
||||
x = x.permute(0, 1, 3, 2, 4, 5).contiguous().view(B, H, W, -1)
|
||||
return x
|
||||
|
||||
|
||||
class WindowAttention(nn.Module):
|
||||
r""" Window based multi-head self attention (W-MSA) module with relative position bias.
|
||||
It supports both of shifted and non-shifted window.
|
||||
|
||||
Args:
|
||||
dim (int): Number of input channels.
|
||||
window_size (tuple[int]): The height and width of the window.
|
||||
num_heads (int): Number of attention heads.
|
||||
qkv_bias (bool, optional): If True, add a learnable bias to query, key, value. Default: True
|
||||
qk_scale (float | None, optional): Override default qk scale of head_dim ** -0.5 if set
|
||||
attn_drop (float, optional): Dropout ratio of attention weight. Default: 0.0
|
||||
proj_drop (float, optional): Dropout ratio of output. Default: 0.0
|
||||
"""
|
||||
|
||||
def __init__(self, dim, window_size, num_heads, qkv_bias=True, qk_scale=None, attn_drop=0., proj_drop=0.):
|
||||
|
||||
super().__init__()
|
||||
self.dim = dim
|
||||
self.window_size = window_size # Wh, Ww
|
||||
self.num_heads = num_heads
|
||||
head_dim = dim // num_heads
|
||||
self.scale = qk_scale or head_dim ** -0.5
|
||||
|
||||
# define a parameter table of relative position bias
|
||||
self.relative_position_bias_table = nn.Parameter(
|
||||
torch.zeros((2 * window_size[0] - 1) * (2 * window_size[1] - 1), num_heads)) # 2*Wh-1 * 2*Ww-1, nH
|
||||
|
||||
# get pair-wise relative position index for each token inside the window
|
||||
coords_h = torch.arange(self.window_size[0])
|
||||
coords_w = torch.arange(self.window_size[1])
|
||||
coords = torch.stack(torch.meshgrid([coords_h, coords_w])) # 2, Wh, Ww
|
||||
coords_flatten = torch.flatten(coords, 1) # 2, Wh*Ww
|
||||
relative_coords = coords_flatten[:, :, None] - coords_flatten[:, None, :] # 2, Wh*Ww, Wh*Ww
|
||||
relative_coords = relative_coords.permute(1, 2, 0).contiguous() # Wh*Ww, Wh*Ww, 2
|
||||
relative_coords[:, :, 0] += self.window_size[0] - 1 # shift to start from 0
|
||||
relative_coords[:, :, 1] += self.window_size[1] - 1
|
||||
relative_coords[:, :, 0] *= 2 * self.window_size[1] - 1
|
||||
relative_position_index = relative_coords.sum(-1) # Wh*Ww, Wh*Ww
|
||||
self.register_buffer("relative_position_index", relative_position_index)
|
||||
|
||||
self.qkv = nn.Linear(dim, dim * 3, bias=qkv_bias)
|
||||
self.attn_drop = nn.Dropout(attn_drop)
|
||||
self.proj = nn.Linear(dim, dim)
|
||||
|
||||
self.proj_drop = nn.Dropout(proj_drop)
|
||||
|
||||
trunc_normal_(self.relative_position_bias_table, std=.02)
|
||||
self.softmax = nn.Softmax(dim=-1)
|
||||
|
||||
def forward(self, x, mask=None):
|
||||
"""
|
||||
Args:
|
||||
x: input features with shape of (num_windows*B, N, C)
|
||||
mask: (0/-inf) mask with shape of (num_windows, Wh*Ww, Wh*Ww) or None
|
||||
"""
|
||||
B_, N, C = x.shape
|
||||
qkv = self.qkv(x).reshape(B_, N, 3, self.num_heads, C // self.num_heads).permute(2, 0, 3, 1, 4)
|
||||
q, k, v = qkv[0], qkv[1], qkv[2] # make torchscript happy (cannot use tensor as tuple)
|
||||
|
||||
q = q * self.scale
|
||||
attn = (q @ k.transpose(-2, -1))
|
||||
|
||||
relative_position_bias = self.relative_position_bias_table[self.relative_position_index.view(-1)].view(
|
||||
self.window_size[0] * self.window_size[1], self.window_size[0] * self.window_size[1], -1) # Wh*Ww,Wh*Ww,nH
|
||||
relative_position_bias = relative_position_bias.permute(2, 0, 1).contiguous() # nH, Wh*Ww, Wh*Ww
|
||||
attn = attn + relative_position_bias.unsqueeze(0)
|
||||
|
||||
if mask is not None:
|
||||
nW = mask.shape[0]
|
||||
attn = attn.view(B_ // nW, nW, self.num_heads, N, N) + mask.unsqueeze(1).unsqueeze(0)
|
||||
attn = attn.view(-1, self.num_heads, N, N)
|
||||
attn = self.softmax(attn)
|
||||
else:
|
||||
attn = self.softmax(attn)
|
||||
|
||||
attn = self.attn_drop(attn)
|
||||
|
||||
x = (attn @ v).transpose(1, 2).reshape(B_, N, C)
|
||||
x = self.proj(x)
|
||||
x = self.proj_drop(x)
|
||||
return x
|
||||
|
||||
def extra_repr(self) -> str:
|
||||
return f'dim={self.dim}, window_size={self.window_size}, num_heads={self.num_heads}'
|
||||
|
||||
def flops(self, N):
|
||||
# calculate flops for 1 window with token length of N
|
||||
flops = 0
|
||||
# qkv = self.qkv(x)
|
||||
flops += N * self.dim * 3 * self.dim
|
||||
# attn = (q @ k.transpose(-2, -1))
|
||||
flops += self.num_heads * N * (self.dim // self.num_heads) * N
|
||||
# x = (attn @ v)
|
||||
flops += self.num_heads * N * N * (self.dim // self.num_heads)
|
||||
# x = self.proj(x)
|
||||
flops += N * self.dim * self.dim
|
||||
return flops
|
||||
|
||||
|
||||
class SwinTransformerBlock(nn.Module):
|
||||
r""" Swin Transformer Block.
|
||||
|
||||
Args:
|
||||
dim (int): Number of input channels.
|
||||
input_resolution (tuple[int]): Input resolution.
|
||||
num_heads (int): Number of attention heads.
|
||||
window_size (int): Window size.
|
||||
shift_size (int): Shift size for SW-MSA.
|
||||
mlp_ratio (float): Ratio of mlp hidden dim to embedding dim.
|
||||
qkv_bias (bool, optional): If True, add a learnable bias to query, key, value. Default: True
|
||||
qk_scale (float | None, optional): Override default qk scale of head_dim ** -0.5 if set.
|
||||
drop (float, optional): Dropout rate. Default: 0.0
|
||||
attn_drop (float, optional): Attention dropout rate. Default: 0.0
|
||||
drop_path (float, optional): Stochastic depth rate. Default: 0.0
|
||||
act_layer (nn.Module, optional): Activation layer. Default: nn.GELU
|
||||
norm_layer (nn.Module, optional): Normalization layer. Default: nn.LayerNorm
|
||||
"""
|
||||
|
||||
def __init__(self, dim, input_resolution, num_heads, window_size=7, shift_size=0,
|
||||
mlp_ratio=4., qkv_bias=True, qk_scale=None, drop=0., attn_drop=0., drop_path=0.,
|
||||
act_layer=nn.GELU, norm_layer=nn.LayerNorm):
|
||||
super().__init__()
|
||||
self.dim = dim
|
||||
self.input_resolution = input_resolution
|
||||
self.num_heads = num_heads
|
||||
self.window_size = window_size
|
||||
self.shift_size = shift_size
|
||||
self.mlp_ratio = mlp_ratio
|
||||
if min(self.input_resolution) <= self.window_size:
|
||||
# if window size is larger than input resolution, we don't partition windows
|
||||
self.shift_size = 0
|
||||
self.window_size = min(self.input_resolution)
|
||||
assert 0 <= self.shift_size < self.window_size, "shift_size must in 0-window_size"
|
||||
|
||||
self.norm1 = norm_layer(dim)
|
||||
self.attn = WindowAttention(
|
||||
dim, window_size=to_2tuple(self.window_size), num_heads=num_heads,
|
||||
qkv_bias=qkv_bias, qk_scale=qk_scale, attn_drop=attn_drop, proj_drop=drop)
|
||||
|
||||
self.drop_path = DropPath(drop_path) if drop_path > 0. else nn.Identity()
|
||||
self.norm2 = norm_layer(dim)
|
||||
mlp_hidden_dim = int(dim * mlp_ratio)
|
||||
self.mlp = Mlp(in_features=dim, hidden_features=mlp_hidden_dim, act_layer=act_layer, drop=drop)
|
||||
|
||||
if self.shift_size > 0:
|
||||
attn_mask = self.calculate_mask(self.input_resolution)
|
||||
else:
|
||||
attn_mask = None
|
||||
|
||||
self.register_buffer("attn_mask", attn_mask)
|
||||
|
||||
def calculate_mask(self, x_size):
|
||||
# calculate attention mask for SW-MSA
|
||||
H, W = x_size
|
||||
img_mask = torch.zeros((1, H, W, 1)) # 1 H W 1
|
||||
h_slices = (slice(0, -self.window_size),
|
||||
slice(-self.window_size, -self.shift_size),
|
||||
slice(-self.shift_size, None))
|
||||
w_slices = (slice(0, -self.window_size),
|
||||
slice(-self.window_size, -self.shift_size),
|
||||
slice(-self.shift_size, None))
|
||||
cnt = 0
|
||||
for h in h_slices:
|
||||
for w in w_slices:
|
||||
img_mask[:, h, w, :] = cnt
|
||||
cnt += 1
|
||||
|
||||
mask_windows = window_partition(img_mask, self.window_size) # nW, window_size, window_size, 1
|
||||
mask_windows = mask_windows.view(-1, self.window_size * self.window_size)
|
||||
attn_mask = mask_windows.unsqueeze(1) - mask_windows.unsqueeze(2)
|
||||
attn_mask = attn_mask.masked_fill(attn_mask != 0, float(-100.0)).masked_fill(attn_mask == 0, float(0.0))
|
||||
|
||||
return attn_mask
|
||||
|
||||
def forward(self, x, x_size):
|
||||
H, W = x_size
|
||||
B, L, C = x.shape
|
||||
# assert L == H * W, "input feature has wrong size"
|
||||
|
||||
shortcut = x
|
||||
x = self.norm1(x)
|
||||
x = x.view(B, H, W, C)
|
||||
|
||||
# cyclic shift
|
||||
if self.shift_size > 0:
|
||||
shifted_x = torch.roll(x, shifts=(-self.shift_size, -self.shift_size), dims=(1, 2))
|
||||
else:
|
||||
shifted_x = x
|
||||
|
||||
# partition windows
|
||||
x_windows = window_partition(shifted_x, self.window_size) # nW*B, window_size, window_size, C
|
||||
x_windows = x_windows.view(-1, self.window_size * self.window_size, C) # nW*B, window_size*window_size, C
|
||||
|
||||
# W-MSA/SW-MSA (to be compatible for testing on images whose shapes are the multiple of window size
|
||||
if self.input_resolution == x_size:
|
||||
attn_windows = self.attn(x_windows, mask=self.attn_mask) # nW*B, window_size*window_size, C
|
||||
else:
|
||||
attn_windows = self.attn(x_windows, mask=self.calculate_mask(x_size).to(x.device))
|
||||
|
||||
# merge windows
|
||||
attn_windows = attn_windows.view(-1, self.window_size, self.window_size, C)
|
||||
shifted_x = window_reverse(attn_windows, self.window_size, H, W) # B H' W' C
|
||||
|
||||
# reverse cyclic shift
|
||||
if self.shift_size > 0:
|
||||
x = torch.roll(shifted_x, shifts=(self.shift_size, self.shift_size), dims=(1, 2))
|
||||
else:
|
||||
x = shifted_x
|
||||
x = x.view(B, H * W, C)
|
||||
|
||||
# FFN
|
||||
x = shortcut + self.drop_path(x)
|
||||
x = x + self.drop_path(self.mlp(self.norm2(x)))
|
||||
|
||||
return x
|
||||
|
||||
def extra_repr(self) -> str:
|
||||
return f"dim={self.dim}, input_resolution={self.input_resolution}, num_heads={self.num_heads}, " \
|
||||
f"window_size={self.window_size}, shift_size={self.shift_size}, mlp_ratio={self.mlp_ratio}"
|
||||
|
||||
def flops(self):
|
||||
flops = 0
|
||||
H, W = self.input_resolution
|
||||
# norm1
|
||||
flops += self.dim * H * W
|
||||
# W-MSA/SW-MSA
|
||||
nW = H * W / self.window_size / self.window_size
|
||||
flops += nW * self.attn.flops(self.window_size * self.window_size)
|
||||
# mlp
|
||||
flops += 2 * H * W * self.dim * self.dim * self.mlp_ratio
|
||||
# norm2
|
||||
flops += self.dim * H * W
|
||||
return flops
|
||||
|
||||
|
||||
class PatchMerging(nn.Module):
|
||||
r""" Patch Merging Layer.
|
||||
|
||||
Args:
|
||||
input_resolution (tuple[int]): Resolution of input feature.
|
||||
dim (int): Number of input channels.
|
||||
norm_layer (nn.Module, optional): Normalization layer. Default: nn.LayerNorm
|
||||
"""
|
||||
|
||||
def __init__(self, input_resolution, dim, norm_layer=nn.LayerNorm):
|
||||
super().__init__()
|
||||
self.input_resolution = input_resolution
|
||||
self.dim = dim
|
||||
self.reduction = nn.Linear(4 * dim, 2 * dim, bias=False)
|
||||
self.norm = norm_layer(4 * dim)
|
||||
|
||||
def forward(self, x):
|
||||
"""
|
||||
x: B, H*W, C
|
||||
"""
|
||||
H, W = self.input_resolution
|
||||
B, L, C = x.shape
|
||||
assert L == H * W, "input feature has wrong size"
|
||||
assert H % 2 == 0 and W % 2 == 0, f"x size ({H}*{W}) are not even."
|
||||
|
||||
x = x.view(B, H, W, C)
|
||||
|
||||
x0 = x[:, 0::2, 0::2, :] # B H/2 W/2 C
|
||||
x1 = x[:, 1::2, 0::2, :] # B H/2 W/2 C
|
||||
x2 = x[:, 0::2, 1::2, :] # B H/2 W/2 C
|
||||
x3 = x[:, 1::2, 1::2, :] # B H/2 W/2 C
|
||||
x = torch.cat([x0, x1, x2, x3], -1) # B H/2 W/2 4*C
|
||||
x = x.view(B, -1, 4 * C) # B H/2*W/2 4*C
|
||||
|
||||
x = self.norm(x)
|
||||
x = self.reduction(x)
|
||||
|
||||
return x
|
||||
|
||||
def extra_repr(self) -> str:
|
||||
return f"input_resolution={self.input_resolution}, dim={self.dim}"
|
||||
|
||||
def flops(self):
|
||||
H, W = self.input_resolution
|
||||
flops = H * W * self.dim
|
||||
flops += (H // 2) * (W // 2) * 4 * self.dim * 2 * self.dim
|
||||
return flops
|
||||
|
||||
|
||||
class BasicLayer(nn.Module):
|
||||
""" A basic Swin Transformer layer for one stage.
|
||||
|
||||
Args:
|
||||
dim (int): Number of input channels.
|
||||
input_resolution (tuple[int]): Input resolution.
|
||||
depth (int): Number of blocks.
|
||||
num_heads (int): Number of attention heads.
|
||||
window_size (int): Local window size.
|
||||
mlp_ratio (float): Ratio of mlp hidden dim to embedding dim.
|
||||
qkv_bias (bool, optional): If True, add a learnable bias to query, key, value. Default: True
|
||||
qk_scale (float | None, optional): Override default qk scale of head_dim ** -0.5 if set.
|
||||
drop (float, optional): Dropout rate. Default: 0.0
|
||||
attn_drop (float, optional): Attention dropout rate. Default: 0.0
|
||||
drop_path (float | tuple[float], optional): Stochastic depth rate. Default: 0.0
|
||||
norm_layer (nn.Module, optional): Normalization layer. Default: nn.LayerNorm
|
||||
downsample (nn.Module | None, optional): Downsample layer at the end of the layer. Default: None
|
||||
use_checkpoint (bool): Whether to use checkpointing to save memory. Default: False.
|
||||
"""
|
||||
|
||||
def __init__(self, dim, input_resolution, depth, num_heads, window_size,
|
||||
mlp_ratio=4., qkv_bias=True, qk_scale=None, drop=0., attn_drop=0.,
|
||||
drop_path=0., norm_layer=nn.LayerNorm, downsample=None, use_checkpoint=False):
|
||||
|
||||
super().__init__()
|
||||
self.dim = dim
|
||||
self.input_resolution = input_resolution
|
||||
self.depth = depth
|
||||
self.use_checkpoint = use_checkpoint
|
||||
|
||||
# build blocks
|
||||
self.blocks = nn.ModuleList([
|
||||
SwinTransformerBlock(dim=dim, input_resolution=input_resolution,
|
||||
num_heads=num_heads, window_size=window_size,
|
||||
shift_size=0 if (i % 2 == 0) else window_size // 2,
|
||||
mlp_ratio=mlp_ratio,
|
||||
qkv_bias=qkv_bias, qk_scale=qk_scale,
|
||||
drop=drop, attn_drop=attn_drop,
|
||||
drop_path=drop_path[i] if isinstance(drop_path, list) else drop_path,
|
||||
norm_layer=norm_layer)
|
||||
for i in range(depth)])
|
||||
|
||||
# patch merging layer
|
||||
if downsample is not None:
|
||||
self.downsample = downsample(input_resolution, dim=dim, norm_layer=norm_layer)
|
||||
else:
|
||||
self.downsample = None
|
||||
|
||||
def forward(self, x, x_size):
|
||||
for blk in self.blocks:
|
||||
if self.use_checkpoint:
|
||||
x = checkpoint.checkpoint(blk, x, x_size)
|
||||
else:
|
||||
x = blk(x, x_size)
|
||||
if self.downsample is not None:
|
||||
x = self.downsample(x)
|
||||
return x
|
||||
|
||||
def extra_repr(self) -> str:
|
||||
return f"dim={self.dim}, input_resolution={self.input_resolution}, depth={self.depth}"
|
||||
|
||||
def flops(self):
|
||||
flops = 0
|
||||
for blk in self.blocks:
|
||||
flops += blk.flops()
|
||||
if self.downsample is not None:
|
||||
flops += self.downsample.flops()
|
||||
return flops
|
||||
|
||||
|
||||
class RSTB(nn.Module):
|
||||
"""Residual Swin Transformer Block (RSTB).
|
||||
|
||||
Args:
|
||||
dim (int): Number of input channels.
|
||||
input_resolution (tuple[int]): Input resolution.
|
||||
depth (int): Number of blocks.
|
||||
num_heads (int): Number of attention heads.
|
||||
window_size (int): Local window size.
|
||||
mlp_ratio (float): Ratio of mlp hidden dim to embedding dim.
|
||||
qkv_bias (bool, optional): If True, add a learnable bias to query, key, value. Default: True
|
||||
qk_scale (float | None, optional): Override default qk scale of head_dim ** -0.5 if set.
|
||||
drop (float, optional): Dropout rate. Default: 0.0
|
||||
attn_drop (float, optional): Attention dropout rate. Default: 0.0
|
||||
drop_path (float | tuple[float], optional): Stochastic depth rate. Default: 0.0
|
||||
norm_layer (nn.Module, optional): Normalization layer. Default: nn.LayerNorm
|
||||
downsample (nn.Module | None, optional): Downsample layer at the end of the layer. Default: None
|
||||
use_checkpoint (bool): Whether to use checkpointing to save memory. Default: False.
|
||||
img_size: Input image size.
|
||||
patch_size: Patch size.
|
||||
resi_connection: The convolutional block before residual connection.
|
||||
"""
|
||||
|
||||
def __init__(self, dim, input_resolution, depth, num_heads, window_size,
|
||||
mlp_ratio=4., qkv_bias=True, qk_scale=None, drop=0., attn_drop=0.,
|
||||
drop_path=0., norm_layer=nn.LayerNorm, downsample=None, use_checkpoint=False,
|
||||
img_size=224, patch_size=4, resi_connection='1conv'):
|
||||
super(RSTB, self).__init__()
|
||||
|
||||
self.dim = dim
|
||||
self.input_resolution = input_resolution
|
||||
|
||||
self.residual_group = BasicLayer(dim=dim,
|
||||
input_resolution=input_resolution,
|
||||
depth=depth,
|
||||
num_heads=num_heads,
|
||||
window_size=window_size,
|
||||
mlp_ratio=mlp_ratio,
|
||||
qkv_bias=qkv_bias, qk_scale=qk_scale,
|
||||
drop=drop, attn_drop=attn_drop,
|
||||
drop_path=drop_path,
|
||||
norm_layer=norm_layer,
|
||||
downsample=downsample,
|
||||
use_checkpoint=use_checkpoint)
|
||||
|
||||
if resi_connection == '1conv':
|
||||
self.conv = nn.Conv2d(dim, dim, 3, 1, 1)
|
||||
elif resi_connection == '3conv':
|
||||
# to save parameters and memory
|
||||
self.conv = nn.Sequential(nn.Conv2d(dim, dim // 4, 3, 1, 1), nn.LeakyReLU(negative_slope=0.2, inplace=True),
|
||||
nn.Conv2d(dim // 4, dim // 4, 1, 1, 0),
|
||||
nn.LeakyReLU(negative_slope=0.2, inplace=True),
|
||||
nn.Conv2d(dim // 4, dim, 3, 1, 1))
|
||||
|
||||
self.patch_embed = PatchEmbed(
|
||||
img_size=img_size, patch_size=patch_size, in_chans=0, embed_dim=dim,
|
||||
norm_layer=None)
|
||||
|
||||
self.patch_unembed = PatchUnEmbed(
|
||||
img_size=img_size, patch_size=patch_size, in_chans=0, embed_dim=dim,
|
||||
norm_layer=None)
|
||||
|
||||
def forward(self, x, x_size):
|
||||
return self.patch_embed(self.conv(self.patch_unembed(self.residual_group(x, x_size), x_size))) + x
|
||||
|
||||
def flops(self):
|
||||
flops = 0
|
||||
flops += self.residual_group.flops()
|
||||
H, W = self.input_resolution
|
||||
flops += H * W * self.dim * self.dim * 9
|
||||
flops += self.patch_embed.flops()
|
||||
flops += self.patch_unembed.flops()
|
||||
|
||||
return flops
|
||||
|
||||
|
||||
class PatchEmbed(nn.Module):
|
||||
r""" Image to Patch Embedding
|
||||
|
||||
Args:
|
||||
img_size (int): Image size. Default: 224.
|
||||
patch_size (int): Patch token size. Default: 4.
|
||||
in_chans (int): Number of input image channels. Default: 3.
|
||||
embed_dim (int): Number of linear projection output channels. Default: 96.
|
||||
norm_layer (nn.Module, optional): Normalization layer. Default: None
|
||||
"""
|
||||
|
||||
def __init__(self, img_size=224, patch_size=4, in_chans=3, embed_dim=96, norm_layer=None):
|
||||
super().__init__()
|
||||
img_size = to_2tuple(img_size)
|
||||
patch_size = to_2tuple(patch_size)
|
||||
patches_resolution = [img_size[0] // patch_size[0], img_size[1] // patch_size[1]]
|
||||
self.img_size = img_size
|
||||
self.patch_size = patch_size
|
||||
self.patches_resolution = patches_resolution
|
||||
self.num_patches = patches_resolution[0] * patches_resolution[1]
|
||||
|
||||
self.in_chans = in_chans
|
||||
self.embed_dim = embed_dim
|
||||
|
||||
if norm_layer is not None:
|
||||
self.norm = norm_layer(embed_dim)
|
||||
else:
|
||||
self.norm = None
|
||||
|
||||
def forward(self, x):
|
||||
x = x.flatten(2).transpose(1, 2) # B Ph*Pw C
|
||||
if self.norm is not None:
|
||||
x = self.norm(x)
|
||||
return x
|
||||
|
||||
def flops(self):
|
||||
flops = 0
|
||||
H, W = self.img_size
|
||||
if self.norm is not None:
|
||||
flops += H * W * self.embed_dim
|
||||
return flops
|
||||
|
||||
|
||||
class PatchUnEmbed(nn.Module):
|
||||
r""" Image to Patch Unembedding
|
||||
|
||||
Args:
|
||||
img_size (int): Image size. Default: 224.
|
||||
patch_size (int): Patch token size. Default: 4.
|
||||
in_chans (int): Number of input image channels. Default: 3.
|
||||
embed_dim (int): Number of linear projection output channels. Default: 96.
|
||||
norm_layer (nn.Module, optional): Normalization layer. Default: None
|
||||
"""
|
||||
|
||||
def __init__(self, img_size=224, patch_size=4, in_chans=3, embed_dim=96, norm_layer=None):
|
||||
super().__init__()
|
||||
img_size = to_2tuple(img_size)
|
||||
patch_size = to_2tuple(patch_size)
|
||||
patches_resolution = [img_size[0] // patch_size[0], img_size[1] // patch_size[1]]
|
||||
self.img_size = img_size
|
||||
self.patch_size = patch_size
|
||||
self.patches_resolution = patches_resolution
|
||||
self.num_patches = patches_resolution[0] * patches_resolution[1]
|
||||
|
||||
self.in_chans = in_chans
|
||||
self.embed_dim = embed_dim
|
||||
|
||||
def forward(self, x, x_size):
|
||||
B, HW, C = x.shape
|
||||
x = x.transpose(1, 2).view(B, self.embed_dim, x_size[0], x_size[1]) # B Ph*Pw C
|
||||
return x
|
||||
|
||||
def flops(self):
|
||||
flops = 0
|
||||
return flops
|
||||
|
||||
|
||||
class Upsample(nn.Sequential):
|
||||
"""Upsample module.
|
||||
|
||||
Args:
|
||||
scale (int): Scale factor. Supported scales: 2^n and 3.
|
||||
num_feat (int): Channel number of intermediate features.
|
||||
"""
|
||||
|
||||
def __init__(self, scale, num_feat):
|
||||
m = []
|
||||
if (scale & (scale - 1)) == 0: # scale = 2^n
|
||||
for _ in range(int(math.log(scale, 2))):
|
||||
m.append(nn.Conv2d(num_feat, 4 * num_feat, 3, 1, 1))
|
||||
m.append(nn.PixelShuffle(2))
|
||||
elif scale == 3:
|
||||
m.append(nn.Conv2d(num_feat, 9 * num_feat, 3, 1, 1))
|
||||
m.append(nn.PixelShuffle(3))
|
||||
else:
|
||||
raise ValueError(f'scale {scale} is not supported. ' 'Supported scales: 2^n and 3.')
|
||||
super(Upsample, self).__init__(*m)
|
||||
|
||||
|
||||
class UpsampleOneStep(nn.Sequential):
|
||||
"""UpsampleOneStep module (the difference with Upsample is that it always only has 1conv + 1pixelshuffle)
|
||||
Used in lightweight SR to save parameters.
|
||||
|
||||
Args:
|
||||
scale (int): Scale factor. Supported scales: 2^n and 3.
|
||||
num_feat (int): Channel number of intermediate features.
|
||||
|
||||
"""
|
||||
|
||||
def __init__(self, scale, num_feat, num_out_ch, input_resolution=None):
|
||||
self.num_feat = num_feat
|
||||
self.input_resolution = input_resolution
|
||||
m = []
|
||||
m.append(nn.Conv2d(num_feat, (scale ** 2) * num_out_ch, 3, 1, 1))
|
||||
m.append(nn.PixelShuffle(scale))
|
||||
super(UpsampleOneStep, self).__init__(*m)
|
||||
|
||||
def flops(self):
|
||||
H, W = self.input_resolution
|
||||
flops = H * W * self.num_feat * 3 * 9
|
||||
return flops
|
||||
|
||||
|
||||
class SwinIR(nn.Module):
|
||||
r""" SwinIR
|
||||
A PyTorch impl of : `SwinIR: Image Restoration Using Swin Transformer`, based on Swin Transformer.
|
||||
|
||||
Args:
|
||||
img_size (int | tuple(int)): Input image size. Default 64
|
||||
patch_size (int | tuple(int)): Patch size. Default: 1
|
||||
in_chans (int): Number of input image channels. Default: 3
|
||||
embed_dim (int): Patch embedding dimension. Default: 96
|
||||
depths (tuple(int)): Depth of each Swin Transformer layer.
|
||||
num_heads (tuple(int)): Number of attention heads in different layers.
|
||||
window_size (int): Window size. Default: 7
|
||||
mlp_ratio (float): Ratio of mlp hidden dim to embedding dim. Default: 4
|
||||
qkv_bias (bool): If True, add a learnable bias to query, key, value. Default: True
|
||||
qk_scale (float): Override default qk scale of head_dim ** -0.5 if set. Default: None
|
||||
drop_rate (float): Dropout rate. Default: 0
|
||||
attn_drop_rate (float): Attention dropout rate. Default: 0
|
||||
drop_path_rate (float): Stochastic depth rate. Default: 0.1
|
||||
norm_layer (nn.Module): Normalization layer. Default: nn.LayerNorm.
|
||||
ape (bool): If True, add absolute position embedding to the patch embedding. Default: False
|
||||
patch_norm (bool): If True, add normalization after patch embedding. Default: True
|
||||
use_checkpoint (bool): Whether to use checkpointing to save memory. Default: False
|
||||
upscale: Upscale factor. 2/3/4/8 for image SR, 1 for denoising and compress artifact reduction
|
||||
img_range: Image range. 1. or 255.
|
||||
upsampler: The reconstruction reconstruction module. 'pixelshuffle'/'pixelshuffledirect'/'nearest+conv'/None
|
||||
resi_connection: The convolutional block before residual connection. '1conv'/'3conv'
|
||||
"""
|
||||
|
||||
def __init__(self, img_size=64, patch_size=1, in_chans=3,
|
||||
embed_dim=96, depths=(6, 6, 6, 6), num_heads=(6, 6, 6, 6),
|
||||
window_size=7, mlp_ratio=4., qkv_bias=True, qk_scale=None,
|
||||
drop_rate=0., attn_drop_rate=0., drop_path_rate=0.1,
|
||||
norm_layer=nn.LayerNorm, ape=False, patch_norm=True,
|
||||
use_checkpoint=False, upscale=2, img_range=1., upsampler='', resi_connection='1conv',
|
||||
**kwargs):
|
||||
super(SwinIR, self).__init__()
|
||||
num_in_ch = in_chans
|
||||
num_out_ch = in_chans
|
||||
num_feat = 64
|
||||
self.img_range = img_range
|
||||
if in_chans == 3:
|
||||
rgb_mean = (0.4488, 0.4371, 0.4040)
|
||||
self.mean = torch.Tensor(rgb_mean).view(1, 3, 1, 1)
|
||||
else:
|
||||
self.mean = torch.zeros(1, 1, 1, 1)
|
||||
self.upscale = upscale
|
||||
self.upsampler = upsampler
|
||||
self.window_size = window_size
|
||||
|
||||
#####################################################################################################
|
||||
################################### 1, shallow feature extraction ###################################
|
||||
self.conv_first = nn.Conv2d(num_in_ch, embed_dim, 3, 1, 1)
|
||||
|
||||
#####################################################################################################
|
||||
################################### 2, deep feature extraction ######################################
|
||||
self.num_layers = len(depths)
|
||||
self.embed_dim = embed_dim
|
||||
self.ape = ape
|
||||
self.patch_norm = patch_norm
|
||||
self.num_features = embed_dim
|
||||
self.mlp_ratio = mlp_ratio
|
||||
|
||||
# split image into non-overlapping patches
|
||||
self.patch_embed = PatchEmbed(
|
||||
img_size=img_size, patch_size=patch_size, in_chans=embed_dim, embed_dim=embed_dim,
|
||||
norm_layer=norm_layer if self.patch_norm else None)
|
||||
num_patches = self.patch_embed.num_patches
|
||||
patches_resolution = self.patch_embed.patches_resolution
|
||||
self.patches_resolution = patches_resolution
|
||||
|
||||
# merge non-overlapping patches into image
|
||||
self.patch_unembed = PatchUnEmbed(
|
||||
img_size=img_size, patch_size=patch_size, in_chans=embed_dim, embed_dim=embed_dim,
|
||||
norm_layer=norm_layer if self.patch_norm else None)
|
||||
|
||||
# absolute position embedding
|
||||
if self.ape:
|
||||
self.absolute_pos_embed = nn.Parameter(torch.zeros(1, num_patches, embed_dim))
|
||||
trunc_normal_(self.absolute_pos_embed, std=.02)
|
||||
|
||||
self.pos_drop = nn.Dropout(p=drop_rate)
|
||||
|
||||
# stochastic depth
|
||||
dpr = [x.item() for x in torch.linspace(0, drop_path_rate, sum(depths))] # stochastic depth decay rule
|
||||
|
||||
# build Residual Swin Transformer blocks (RSTB)
|
||||
self.layers = nn.ModuleList()
|
||||
for i_layer in range(self.num_layers):
|
||||
layer = RSTB(dim=embed_dim,
|
||||
input_resolution=(patches_resolution[0],
|
||||
patches_resolution[1]),
|
||||
depth=depths[i_layer],
|
||||
num_heads=num_heads[i_layer],
|
||||
window_size=window_size,
|
||||
mlp_ratio=self.mlp_ratio,
|
||||
qkv_bias=qkv_bias, qk_scale=qk_scale,
|
||||
drop=drop_rate, attn_drop=attn_drop_rate,
|
||||
drop_path=dpr[sum(depths[:i_layer]):sum(depths[:i_layer + 1])], # no impact on SR results
|
||||
norm_layer=norm_layer,
|
||||
downsample=None,
|
||||
use_checkpoint=use_checkpoint,
|
||||
img_size=img_size,
|
||||
patch_size=patch_size,
|
||||
resi_connection=resi_connection
|
||||
|
||||
)
|
||||
self.layers.append(layer)
|
||||
self.norm = norm_layer(self.num_features)
|
||||
|
||||
# build the last conv layer in deep feature extraction
|
||||
if resi_connection == '1conv':
|
||||
self.conv_after_body = nn.Conv2d(embed_dim, embed_dim, 3, 1, 1)
|
||||
elif resi_connection == '3conv':
|
||||
# to save parameters and memory
|
||||
self.conv_after_body = nn.Sequential(nn.Conv2d(embed_dim, embed_dim // 4, 3, 1, 1),
|
||||
nn.LeakyReLU(negative_slope=0.2, inplace=True),
|
||||
nn.Conv2d(embed_dim // 4, embed_dim // 4, 1, 1, 0),
|
||||
nn.LeakyReLU(negative_slope=0.2, inplace=True),
|
||||
nn.Conv2d(embed_dim // 4, embed_dim, 3, 1, 1))
|
||||
|
||||
#####################################################################################################
|
||||
################################ 3, high quality image reconstruction ################################
|
||||
if self.upsampler == 'pixelshuffle':
|
||||
# for classical SR
|
||||
self.conv_before_upsample = nn.Sequential(nn.Conv2d(embed_dim, num_feat, 3, 1, 1),
|
||||
nn.LeakyReLU(inplace=True))
|
||||
self.upsample = Upsample(upscale, num_feat)
|
||||
self.conv_last = nn.Conv2d(num_feat, num_out_ch, 3, 1, 1)
|
||||
elif self.upsampler == 'pixelshuffledirect':
|
||||
# for lightweight SR (to save parameters)
|
||||
self.upsample = UpsampleOneStep(upscale, embed_dim, num_out_ch,
|
||||
(patches_resolution[0], patches_resolution[1]))
|
||||
elif self.upsampler == 'nearest+conv':
|
||||
# for real-world SR (less artifacts)
|
||||
self.conv_before_upsample = nn.Sequential(nn.Conv2d(embed_dim, num_feat, 3, 1, 1),
|
||||
nn.LeakyReLU(inplace=True))
|
||||
self.conv_up1 = nn.Conv2d(num_feat, num_feat, 3, 1, 1)
|
||||
if self.upscale == 4:
|
||||
self.conv_up2 = nn.Conv2d(num_feat, num_feat, 3, 1, 1)
|
||||
self.conv_hr = nn.Conv2d(num_feat, num_feat, 3, 1, 1)
|
||||
self.conv_last = nn.Conv2d(num_feat, num_out_ch, 3, 1, 1)
|
||||
self.lrelu = nn.LeakyReLU(negative_slope=0.2, inplace=True)
|
||||
else:
|
||||
# for image denoising and JPEG compression artifact reduction
|
||||
self.conv_last = nn.Conv2d(embed_dim, num_out_ch, 3, 1, 1)
|
||||
|
||||
self.apply(self._init_weights)
|
||||
|
||||
def _init_weights(self, m):
|
||||
if isinstance(m, nn.Linear):
|
||||
trunc_normal_(m.weight, std=.02)
|
||||
if isinstance(m, nn.Linear) and m.bias is not None:
|
||||
nn.init.constant_(m.bias, 0)
|
||||
elif isinstance(m, nn.LayerNorm):
|
||||
nn.init.constant_(m.bias, 0)
|
||||
nn.init.constant_(m.weight, 1.0)
|
||||
|
||||
@torch.jit.ignore
|
||||
def no_weight_decay(self):
|
||||
return {'absolute_pos_embed'}
|
||||
|
||||
@torch.jit.ignore
|
||||
def no_weight_decay_keywords(self):
|
||||
return {'relative_position_bias_table'}
|
||||
|
||||
def check_image_size(self, x):
|
||||
_, _, h, w = x.size()
|
||||
mod_pad_h = (self.window_size - h % self.window_size) % self.window_size
|
||||
mod_pad_w = (self.window_size - w % self.window_size) % self.window_size
|
||||
x = F.pad(x, (0, mod_pad_w, 0, mod_pad_h), 'reflect')
|
||||
return x
|
||||
|
||||
def forward_features(self, x):
|
||||
x_size = (x.shape[2], x.shape[3])
|
||||
x = self.patch_embed(x)
|
||||
if self.ape:
|
||||
x = x + self.absolute_pos_embed
|
||||
x = self.pos_drop(x)
|
||||
|
||||
for layer in self.layers:
|
||||
x = layer(x, x_size)
|
||||
|
||||
x = self.norm(x) # B L C
|
||||
x = self.patch_unembed(x, x_size)
|
||||
|
||||
return x
|
||||
|
||||
def forward(self, x):
|
||||
H, W = x.shape[2:]
|
||||
x = self.check_image_size(x)
|
||||
|
||||
self.mean = self.mean.type_as(x)
|
||||
x = (x - self.mean) * self.img_range
|
||||
|
||||
if self.upsampler == 'pixelshuffle':
|
||||
# for classical SR
|
||||
x = self.conv_first(x)
|
||||
x = self.conv_after_body(self.forward_features(x)) + x
|
||||
x = self.conv_before_upsample(x)
|
||||
x = self.conv_last(self.upsample(x))
|
||||
elif self.upsampler == 'pixelshuffledirect':
|
||||
# for lightweight SR
|
||||
x = self.conv_first(x)
|
||||
x = self.conv_after_body(self.forward_features(x)) + x
|
||||
x = self.upsample(x)
|
||||
elif self.upsampler == 'nearest+conv':
|
||||
# for real-world SR
|
||||
x = self.conv_first(x)
|
||||
x = self.conv_after_body(self.forward_features(x)) + x
|
||||
x = self.conv_before_upsample(x)
|
||||
x = self.lrelu(self.conv_up1(torch.nn.functional.interpolate(x, scale_factor=2, mode='nearest')))
|
||||
if self.upscale == 4:
|
||||
x = self.lrelu(self.conv_up2(torch.nn.functional.interpolate(x, scale_factor=2, mode='nearest')))
|
||||
x = self.conv_last(self.lrelu(self.conv_hr(x)))
|
||||
else:
|
||||
# for image denoising and JPEG compression artifact reduction
|
||||
x_first = self.conv_first(x)
|
||||
res = self.conv_after_body(self.forward_features(x_first)) + x_first
|
||||
x = x + self.conv_last(res)
|
||||
|
||||
x = x / self.img_range + self.mean
|
||||
|
||||
return x[:, :, :H*self.upscale, :W*self.upscale]
|
||||
|
||||
def flops(self):
|
||||
flops = 0
|
||||
H, W = self.patches_resolution
|
||||
flops += H * W * 3 * self.embed_dim * 9
|
||||
flops += self.patch_embed.flops()
|
||||
for layer in self.layers:
|
||||
flops += layer.flops()
|
||||
flops += H * W * 3 * self.embed_dim * self.embed_dim
|
||||
flops += self.upsample.flops()
|
||||
return flops
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
upscale = 4
|
||||
window_size = 8
|
||||
height = (1024 // upscale // window_size + 1) * window_size
|
||||
width = (720 // upscale // window_size + 1) * window_size
|
||||
model = SwinIR(upscale=2, img_size=(height, width),
|
||||
window_size=window_size, img_range=1., depths=[6, 6, 6, 6],
|
||||
embed_dim=60, num_heads=[6, 6, 6, 6], mlp_ratio=2, upsampler='pixelshuffledirect')
|
||||
print(model)
|
||||
print(height, width, model.flops() / 1e9)
|
||||
|
||||
x = torch.randn((1, 3, height, width))
|
||||
x = model(x)
|
||||
print(x.shape)
|
||||
File diff suppressed because it is too large
Load Diff
Reference in New Issue
Block a user