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pytorch-image-models/timm/models/swin_transformer.py

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""" Swin Transformer
A PyTorch impl of : `Swin Transformer: Hierarchical Vision Transformer using Shifted Windows`
- https://arxiv.org/pdf/2103.14030
Code/weights from https://github.com/microsoft/Swin-Transformer, original copyright/license info below
Modifications and additions for timm hacked together by / Copyright 2021, Ross Wightman
"""
# --------------------------------------------------------
# Swin Transformer
# Copyright (c) 2021 Microsoft
# Licensed under The MIT License [see LICENSE for details]
# Written by Ze Liu
# --------------------------------------------------------
import logging
import math
from functools import partial
from typing import Optional
import torch
import torch.nn as nn
from timm.data import IMAGENET_DEFAULT_MEAN, IMAGENET_DEFAULT_STD
from .fx_features import register_notrace_function
from .helpers import build_model_with_cfg, named_apply, checkpoint_seq
from .layers import PatchEmbed, Mlp, DropPath, to_2tuple, to_ntuple, trunc_normal_, _assert
from .registry import register_model
from .vision_transformer import checkpoint_filter_fn, get_init_weights_vit
_logger = logging.getLogger(__name__)
def _cfg(url='', **kwargs):
return {
'url': url,
'num_classes': 1000, 'input_size': (3, 224, 224), 'pool_size': None,
'crop_pct': .9, 'interpolation': 'bicubic', 'fixed_input_size': True,
'mean': IMAGENET_DEFAULT_MEAN, 'std': IMAGENET_DEFAULT_STD,
'first_conv': 'patch_embed.proj', 'classifier': 'head',
**kwargs
}
default_cfgs = {
# patch models (my experiments)
'swin_base_patch4_window12_384': _cfg(
url='https://github.com/SwinTransformer/storage/releases/download/v1.0.0/swin_base_patch4_window12_384_22kto1k.pth',
input_size=(3, 384, 384), crop_pct=1.0),
'swin_base_patch4_window7_224': _cfg(
url='https://github.com/SwinTransformer/storage/releases/download/v1.0.0/swin_base_patch4_window7_224_22kto1k.pth',
),
'swin_large_patch4_window12_384': _cfg(
url='https://github.com/SwinTransformer/storage/releases/download/v1.0.0/swin_large_patch4_window12_384_22kto1k.pth',
input_size=(3, 384, 384), crop_pct=1.0),
'swin_large_patch4_window7_224': _cfg(
url='https://github.com/SwinTransformer/storage/releases/download/v1.0.0/swin_large_patch4_window7_224_22kto1k.pth',
),
'swin_small_patch4_window7_224': _cfg(
url='https://github.com/SwinTransformer/storage/releases/download/v1.0.0/swin_small_patch4_window7_224.pth',
),
'swin_tiny_patch4_window7_224': _cfg(
url='https://github.com/SwinTransformer/storage/releases/download/v1.0.0/swin_tiny_patch4_window7_224.pth',
),
'swin_base_patch4_window12_384_in22k': _cfg(
url='https://github.com/SwinTransformer/storage/releases/download/v1.0.0/swin_base_patch4_window12_384_22k.pth',
input_size=(3, 384, 384), crop_pct=1.0, num_classes=21841),
'swin_base_patch4_window7_224_in22k': _cfg(
url='https://github.com/SwinTransformer/storage/releases/download/v1.0.0/swin_base_patch4_window7_224_22k.pth',
num_classes=21841),
'swin_large_patch4_window12_384_in22k': _cfg(
url='https://github.com/SwinTransformer/storage/releases/download/v1.0.0/swin_large_patch4_window12_384_22k.pth',
input_size=(3, 384, 384), crop_pct=1.0, num_classes=21841),
'swin_large_patch4_window7_224_in22k': _cfg(
url='https://github.com/SwinTransformer/storage/releases/download/v1.0.0/swin_large_patch4_window7_224_22k.pth',
num_classes=21841),
'swin_s3_tiny_224': _cfg(
url='https://github.com/silent-chen/AutoFormerV2-model-zoo/releases/download/v1.0.0/S3-T.pth'
),
'swin_s3_small_224': _cfg(
url='https://github.com/silent-chen/AutoFormerV2-model-zoo/releases/download/v1.0.0/S3-S.pth'
),
'swin_s3_base_224': _cfg(
url='https://github.com/silent-chen/AutoFormerV2-model-zoo/releases/download/v1.0.0/S3-B.pth'
)
}
def window_partition(x, window_size: int):
"""
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
@register_notrace_function # reason: int argument is a Proxy
def window_reverse(windows, window_size: int, H: int, W: int):
"""
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
def get_relative_position_index(win_h, win_w):
# get pair-wise relative position index for each token inside the window
coords = torch.stack(torch.meshgrid([torch.arange(win_h), torch.arange(win_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] += win_h - 1 # shift to start from 0
relative_coords[:, :, 1] += win_w - 1
relative_coords[:, :, 0] *= 2 * win_w - 1
return relative_coords.sum(-1) # Wh*Ww, Wh*Ww
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.
num_heads (int): Number of attention heads.
head_dim (int): Number of channels per head (dim // num_heads if not set)
window_size (tuple[int]): The height and width of the window.
qkv_bias (bool, optional): If True, add a learnable bias to query, key, value. Default: True
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, num_heads, head_dim=None, window_size=7, qkv_bias=True, attn_drop=0., proj_drop=0.):
super().__init__()
self.dim = dim
self.window_size = to_2tuple(window_size) # Wh, Ww
win_h, win_w = self.window_size
self.window_area = win_h * win_w
self.num_heads = num_heads
head_dim = head_dim or dim // num_heads
attn_dim = head_dim * num_heads
self.scale = head_dim ** -0.5
# define a parameter table of relative position bias, shape: 2*Wh-1 * 2*Ww-1, nH
self.relative_position_bias_table = nn.Parameter(torch.zeros((2 * win_h - 1) * (2 * win_w - 1), num_heads))
# get pair-wise relative position index for each token inside the window
self.register_buffer("relative_position_index", get_relative_position_index(win_h, win_w))
self.qkv = nn.Linear(dim, attn_dim * 3, bias=qkv_bias)
self.attn_drop = nn.Dropout(attn_drop)
self.proj = nn.Linear(attn_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 _get_rel_pos_bias(self) -> torch.Tensor:
relative_position_bias = self.relative_position_bias_table[
self.relative_position_index.view(-1)].view(self.window_area, self.window_area, -1) # Wh*Ww,Wh*Ww,nH
relative_position_bias = relative_position_bias.permute(2, 0, 1).contiguous() # nH, Wh*Ww, Wh*Ww
return relative_position_bias.unsqueeze(0)
def forward(self, x, mask: Optional[torch.Tensor] = 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, -1).permute(2, 0, 3, 1, 4)
q, k, v = qkv.unbind(0) # make torchscript happy (cannot use tensor as tuple)
q = q * self.scale
attn = (q @ k.transpose(-2, -1))
attn = attn + self._get_rel_pos_bias()
if mask is not None:
num_win = mask.shape[0]
attn = attn.view(B_ // num_win, num_win, 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, -1)
x = self.proj(x)
x = self.proj_drop(x)
return x
class SwinTransformerBlock(nn.Module):
r""" Swin Transformer Block.
Args:
dim (int): Number of input channels.
input_resolution (tuple[int]): Input resulotion.
window_size (int): Window size.
num_heads (int): Number of attention heads.
head_dim (int): Enforce the number of channels per head
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
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=4, head_dim=None, window_size=7, shift_size=0,
mlp_ratio=4., qkv_bias=True, 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.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, num_heads=num_heads, head_dim=head_dim, window_size=to_2tuple(self.window_size),
qkv_bias=qkv_bias, 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)
self.mlp = Mlp(in_features=dim, hidden_features=int(dim * mlp_ratio), act_layer=act_layer, drop=drop)
if self.shift_size > 0:
# calculate attention mask for SW-MSA
H, W = self.input_resolution
img_mask = torch.zeros((1, H, W, 1)) # 1 H W 1
cnt = 0
for h in (
slice(0, -self.window_size),
slice(-self.window_size, -self.shift_size),
slice(-self.shift_size, None)):
for w in (
slice(0, -self.window_size),
slice(-self.window_size, -self.shift_size),
slice(-self.shift_size, None)):
img_mask[:, h, w, :] = cnt
cnt += 1
mask_windows = window_partition(img_mask, self.window_size) # num_win, 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))
else:
attn_mask = None
self.register_buffer("attn_mask", attn_mask)
def forward(self, x):
H, W = self.input_resolution
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) # num_win*B, window_size, window_size, C
x_windows = x_windows.view(-1, self.window_size * self.window_size, C) # num_win*B, window_size*window_size, C
# W-MSA/SW-MSA
attn_windows = self.attn(x_windows, mask=self.attn_mask) # num_win*B, window_size*window_size, C
# 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
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, out_dim=None, norm_layer=nn.LayerNorm):
super().__init__()
self.input_resolution = input_resolution
self.dim = dim
self.out_dim = out_dim or 2 * dim
self.norm = norm_layer(4 * dim)
self.reduction = nn.Linear(4 * dim, self.out_dim, bias=False)
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
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.
head_dim (int): Channels per head (dim // num_heads if not set)
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
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
"""
def __init__(
self, dim, out_dim, input_resolution, depth, num_heads=4, head_dim=None,
window_size=7, mlp_ratio=4., qkv_bias=True, drop=0., attn_drop=0.,
drop_path=0., norm_layer=nn.LayerNorm, downsample=None):
super().__init__()
self.dim = dim
self.input_resolution = input_resolution
self.depth = depth
self.grad_checkpointing = False
# build blocks
self.blocks = nn.Sequential(*[
SwinTransformerBlock(
dim=dim, input_resolution=input_resolution, num_heads=num_heads, head_dim=head_dim,
window_size=window_size, shift_size=0 if (i % 2 == 0) else window_size // 2,
mlp_ratio=mlp_ratio, qkv_bias=qkv_bias, 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, out_dim=out_dim, norm_layer=norm_layer)
else:
self.downsample = None
def forward(self, x):
if self.grad_checkpointing and not torch.jit.is_scripting():
x = checkpoint_seq(self.blocks, x)
else:
x = self.blocks(x)
if self.downsample is not None:
x = self.downsample(x)
return x
class SwinTransformer(nn.Module):
r""" Swin Transformer
A PyTorch impl of : `Swin Transformer: Hierarchical Vision Transformer using Shifted Windows` -
https://arxiv.org/pdf/2103.14030
Args:
img_size (int | tuple(int)): Input image size. Default 224
patch_size (int | tuple(int)): Patch size. Default: 4
in_chans (int): Number of input image channels. Default: 3
num_classes (int): Number of classes for classification head. Default: 1000
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.
head_dim (int, tuple(int)):
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
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
"""
def __init__(
self, img_size=224, patch_size=4, in_chans=3, num_classes=1000, global_pool='avg',
embed_dim=96, depths=(2, 2, 6, 2), num_heads=(3, 6, 12, 24), head_dim=None,
window_size=7, mlp_ratio=4., qkv_bias=True,
drop_rate=0., attn_drop_rate=0., drop_path_rate=0.1,
norm_layer=nn.LayerNorm, ape=False, patch_norm=True, weight_init='', **kwargs):
super().__init__()
assert global_pool in ('', 'avg')
self.num_classes = num_classes
self.global_pool = global_pool
self.num_layers = len(depths)
self.embed_dim = embed_dim
self.num_features = int(embed_dim * 2 ** (self.num_layers - 1))
# split image into non-overlapping patches
self.patch_embed = PatchEmbed(
img_size=img_size, patch_size=patch_size, in_chans=in_chans, embed_dim=embed_dim,
norm_layer=norm_layer if patch_norm else None)
num_patches = self.patch_embed.num_patches
self.patch_grid = self.patch_embed.grid_size
# absolute position embedding
self.absolute_pos_embed = nn.Parameter(torch.zeros(1, num_patches, embed_dim)) if ape else None
self.pos_drop = nn.Dropout(p=drop_rate)
# build layers
if not isinstance(embed_dim, (tuple, list)):
embed_dim = [int(embed_dim * 2 ** i) for i in range(self.num_layers)]
embed_out_dim = embed_dim[1:] + [None]
head_dim = to_ntuple(self.num_layers)(head_dim)
window_size = to_ntuple(self.num_layers)(window_size)
mlp_ratio = to_ntuple(self.num_layers)(mlp_ratio)
dpr = [x.item() for x in torch.linspace(0, drop_path_rate, sum(depths))] # stochastic depth decay rule
layers = []
for i in range(self.num_layers):
layers += [BasicLayer(
dim=embed_dim[i],
out_dim=embed_out_dim[i],
input_resolution=(self.patch_grid[0] // (2 ** i), self.patch_grid[1] // (2 ** i)),
depth=depths[i],
num_heads=num_heads[i],
head_dim=head_dim[i],
window_size=window_size[i],
mlp_ratio=mlp_ratio[i],
qkv_bias=qkv_bias,
drop=drop_rate,
attn_drop=attn_drop_rate,
drop_path=dpr[sum(depths[:i]):sum(depths[:i + 1])],
norm_layer=norm_layer,
downsample=PatchMerging if (i < self.num_layers - 1) else None
)]
self.layers = nn.Sequential(*layers)
self.norm = norm_layer(self.num_features)
self.head = nn.Linear(self.num_features, num_classes) if num_classes > 0 else nn.Identity()
if weight_init != 'skip':
self.init_weights(weight_init)
@torch.jit.ignore
def init_weights(self, mode=''):
assert mode in ('jax', 'jax_nlhb', 'moco', '')
if self.absolute_pos_embed is not None:
trunc_normal_(self.absolute_pos_embed, std=.02)
head_bias = -math.log(self.num_classes) if 'nlhb' in mode else 0.
named_apply(get_init_weights_vit(mode, head_bias=head_bias), self)
@torch.jit.ignore
def no_weight_decay(self):
nwd = {'absolute_pos_embed'}
for n, _ in self.named_parameters():
if 'relative_position_bias_table' in n:
nwd.add(n)
return nwd
@torch.jit.ignore
def group_matcher(self, coarse=False):
return dict(
stem=r'^absolute_pos_embed|patch_embed', # stem and embed
blocks=r'^layers.(\d+)' if coarse else [
(r'^layers.(\d+).downsample', (0,)),
(r'^layers.(\d+).\w+.(\d+)', None),
(r'^norm', (99999,)),
]
)
@torch.jit.ignore
def set_grad_checkpointing(self, enable=True):
for l in self.layers:
l.grad_checkpointing = enable
@torch.jit.ignore
def get_classifier(self):
return self.head
def reset_classifier(self, num_classes, global_pool=None):
self.num_classes = num_classes
if global_pool is not None:
assert global_pool in ('', 'avg')
self.global_pool = global_pool
self.head = nn.Linear(self.num_features, num_classes) if num_classes > 0 else nn.Identity()
def forward_features(self, x):
x = self.patch_embed(x)
if self.absolute_pos_embed is not None:
x = x + self.absolute_pos_embed
x = self.pos_drop(x)
x = self.layers(x)
x = self.norm(x) # B L C
return x
def forward_head(self, x, pre_logits: bool = False):
if self.global_pool == 'avg':
x = x.mean(dim=1)
return x if pre_logits else self.head(x)
def forward(self, x):
x = self.forward_features(x)
x = self.forward_head(x)
return x
def _create_swin_transformer(variant, pretrained=False, **kwargs):
model = build_model_with_cfg(
SwinTransformer, variant, pretrained,
pretrained_filter_fn=checkpoint_filter_fn,
**kwargs)
return model
@register_model
def swin_base_patch4_window12_384(pretrained=False, **kwargs):
""" Swin-B @ 384x384, pretrained ImageNet-22k, fine tune 1k
"""
model_kwargs = dict(
patch_size=4, window_size=12, embed_dim=128, depths=(2, 2, 18, 2), num_heads=(4, 8, 16, 32), **kwargs)
return _create_swin_transformer('swin_base_patch4_window12_384', pretrained=pretrained, **model_kwargs)
@register_model
def swin_base_patch4_window7_224(pretrained=False, **kwargs):
""" Swin-B @ 224x224, pretrained ImageNet-22k, fine tune 1k
"""
model_kwargs = dict(
patch_size=4, window_size=7, embed_dim=128, depths=(2, 2, 18, 2), num_heads=(4, 8, 16, 32), **kwargs)
return _create_swin_transformer('swin_base_patch4_window7_224', pretrained=pretrained, **model_kwargs)
@register_model
def swin_large_patch4_window12_384(pretrained=False, **kwargs):
""" Swin-L @ 384x384, pretrained ImageNet-22k, fine tune 1k
"""
model_kwargs = dict(
patch_size=4, window_size=12, embed_dim=192, depths=(2, 2, 18, 2), num_heads=(6, 12, 24, 48), **kwargs)
return _create_swin_transformer('swin_large_patch4_window12_384', pretrained=pretrained, **model_kwargs)
@register_model
def swin_large_patch4_window7_224(pretrained=False, **kwargs):
""" Swin-L @ 224x224, pretrained ImageNet-22k, fine tune 1k
"""
model_kwargs = dict(
patch_size=4, window_size=7, embed_dim=192, depths=(2, 2, 18, 2), num_heads=(6, 12, 24, 48), **kwargs)
return _create_swin_transformer('swin_large_patch4_window7_224', pretrained=pretrained, **model_kwargs)
@register_model
def swin_small_patch4_window7_224(pretrained=False, **kwargs):
""" Swin-S @ 224x224, trained ImageNet-1k
"""
model_kwargs = dict(
patch_size=4, window_size=7, embed_dim=96, depths=(2, 2, 18, 2), num_heads=(3, 6, 12, 24), **kwargs)
return _create_swin_transformer('swin_small_patch4_window7_224', pretrained=pretrained, **model_kwargs)
@register_model
def swin_tiny_patch4_window7_224(pretrained=False, **kwargs):
""" Swin-T @ 224x224, trained ImageNet-1k
"""
model_kwargs = dict(
patch_size=4, window_size=7, embed_dim=96, depths=(2, 2, 6, 2), num_heads=(3, 6, 12, 24), **kwargs)
return _create_swin_transformer('swin_tiny_patch4_window7_224', pretrained=pretrained, **model_kwargs)
@register_model
def swin_base_patch4_window12_384_in22k(pretrained=False, **kwargs):
""" Swin-B @ 384x384, trained ImageNet-22k
"""
model_kwargs = dict(
patch_size=4, window_size=12, embed_dim=128, depths=(2, 2, 18, 2), num_heads=(4, 8, 16, 32), **kwargs)
return _create_swin_transformer('swin_base_patch4_window12_384_in22k', pretrained=pretrained, **model_kwargs)
@register_model
def swin_base_patch4_window7_224_in22k(pretrained=False, **kwargs):
""" Swin-B @ 224x224, trained ImageNet-22k
"""
model_kwargs = dict(
patch_size=4, window_size=7, embed_dim=128, depths=(2, 2, 18, 2), num_heads=(4, 8, 16, 32), **kwargs)
return _create_swin_transformer('swin_base_patch4_window7_224_in22k', pretrained=pretrained, **model_kwargs)
@register_model
def swin_large_patch4_window12_384_in22k(pretrained=False, **kwargs):
""" Swin-L @ 384x384, trained ImageNet-22k
"""
model_kwargs = dict(
patch_size=4, window_size=12, embed_dim=192, depths=(2, 2, 18, 2), num_heads=(6, 12, 24, 48), **kwargs)
return _create_swin_transformer('swin_large_patch4_window12_384_in22k', pretrained=pretrained, **model_kwargs)
@register_model
def swin_large_patch4_window7_224_in22k(pretrained=False, **kwargs):
""" Swin-L @ 224x224, trained ImageNet-22k
"""
model_kwargs = dict(
patch_size=4, window_size=7, embed_dim=192, depths=(2, 2, 18, 2), num_heads=(6, 12, 24, 48), **kwargs)
return _create_swin_transformer('swin_large_patch4_window7_224_in22k', pretrained=pretrained, **model_kwargs)
@register_model
def swin_s3_tiny_224(pretrained=False, **kwargs):
""" Swin-S3-T @ 224x224, ImageNet-1k
"""
model_kwargs = dict(
patch_size=4, window_size=(7, 7, 14, 7), embed_dim=96, depths=(2, 2, 6, 2),
num_heads=(3, 6, 12, 24), **kwargs)
return _create_swin_transformer('swin_s3_tiny_224', pretrained=pretrained, **model_kwargs)
@register_model
def swin_s3_small_224(pretrained=False, **kwargs):
""" Swin-S3-S @ 224x224, trained ImageNet-1k
"""
model_kwargs = dict(
patch_size=4, window_size=(14, 14, 14, 7), embed_dim=96, depths=(2, 2, 18, 2),
num_heads=(3, 6, 12, 24), **kwargs)
return _create_swin_transformer('swin_s3_small_224', pretrained=pretrained, **model_kwargs)
@register_model
def swin_s3_base_224(pretrained=False, **kwargs):
""" Swin-S3-B @ 224x224, trained ImageNet-1k
"""
model_kwargs = dict(
patch_size=4, window_size=(7, 7, 14, 7), embed_dim=96, depths=(2, 2, 30, 2),
num_heads=(3, 6, 12, 24), **kwargs)
return _create_swin_transformer('swin_s3_base_224', pretrained=pretrained, **model_kwargs)
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