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crossvit.py
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crossvit.py
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# Copyright IBM All Rights Reserved.
# SPDX-License-Identifier: Apache-2.0
"""
Modifed from Timm. https://github.com/rwightman/pytorch-image-models/blob/master/timm/models/vision_transformer.py
"""
import torch
import torch.nn as nn
import torch.nn.functional as F
import torch.hub
from functools import partial
from timm.models.layers import DropPath, to_2tuple, trunc_normal_
from timm.models.registry import register_model
from timm.models.vision_transformer import _cfg, Mlp, Block
_model_urls = {
'crossvit_15_224': 'https://github.com/IBM/CrossViT/releases/download/weights-0.1/crossvit_15_224.pth',
'crossvit_15_dagger_224': 'https://github.com/IBM/CrossViT/releases/download/weights-0.1/crossvit_15_dagger_224.pth',
'crossvit_15_dagger_384': 'https://github.com/IBM/CrossViT/releases/download/weights-0.1/crossvit_15_dagger_384.pth',
'crossvit_18_224': 'https://github.com/IBM/CrossViT/releases/download/weights-0.1/crossvit_18_224.pth',
'crossvit_18_dagger_224': 'https://github.com/IBM/CrossViT/releases/download/weights-0.1/crossvit_18_dagger_224.pth',
'crossvit_18_dagger_384': 'https://github.com/IBM/CrossViT/releases/download/weights-0.1/crossvit_18_dagger_384.pth',
'crossvit_9_224': 'https://github.com/IBM/CrossViT/releases/download/weights-0.1/crossvit_9_224.pth',
'crossvit_9_dagger_224': 'https://github.com/IBM/CrossViT/releases/download/weights-0.1/crossvit_9_dagger_224.pth',
'crossvit_base_224': 'https://github.com/IBM/CrossViT/releases/download/weights-0.1/crossvit_base_224.pth',
'crossvit_small_224': 'https://github.com/IBM/CrossViT/releases/download/weights-0.1/crossvit_small_224.pth',
'crossvit_tiny_224': 'https://github.com/IBM/CrossViT/releases/download/weights-0.1/crossvit_tiny_224.pth',
}
class PatchEmbed(nn.Module):
""" Image to Patch Embedding
"""
def __init__(self, img_size=224, patch_size=16, in_chans=3, embed_dim=768, multi_conv=False):
super().__init__()
img_size = to_2tuple(img_size)
patch_size = to_2tuple(patch_size)
num_patches = (img_size[1] // patch_size[1]) * (img_size[0] // patch_size[0])
self.img_size = img_size
self.patch_size = patch_size
self.num_patches = num_patches
if multi_conv:
if patch_size[0] == 12:
self.proj = nn.Sequential(
nn.Conv2d(in_chans, embed_dim // 4, kernel_size=7, stride=4, padding=3),
nn.ReLU(inplace=True),
nn.Conv2d(embed_dim // 4, embed_dim // 2, kernel_size=3, stride=3, padding=0),
nn.ReLU(inplace=True),
nn.Conv2d(embed_dim // 2, embed_dim, kernel_size=3, stride=1, padding=1),
)
elif patch_size[0] == 16:
self.proj = nn.Sequential(
nn.Conv2d(in_chans, embed_dim // 4, kernel_size=7, stride=4, padding=3),
nn.ReLU(inplace=True),
nn.Conv2d(embed_dim // 4, embed_dim // 2, kernel_size=3, stride=2, padding=1),
nn.ReLU(inplace=True),
nn.Conv2d(embed_dim // 2, embed_dim, kernel_size=3, stride=2, padding=1),
)
else:
self.proj = nn.Conv2d(in_chans, embed_dim, kernel_size=patch_size, stride=patch_size)
def forward(self, x):
B, C, H, W = x.shape
# FIXME look at relaxing size constraints
assert H == self.img_size[0] and W == self.img_size[1], \
f"Input image size ({H}*{W}) doesn't match model ({self.img_size[0]}*{self.img_size[1]})."
x = self.proj(x).flatten(2).transpose(1, 2)
return x
class CrossAttention(nn.Module):
def __init__(self, dim, num_heads=8, qkv_bias=False, qk_scale=None, attn_drop=0., proj_drop=0.):
super().__init__()
self.num_heads = num_heads
head_dim = dim // num_heads
# NOTE scale factor was wrong in my original version, can set manually to be compat with prev weights
self.scale = qk_scale or head_dim ** -0.5
self.wq = nn.Linear(dim, dim, bias=qkv_bias)
self.wk = nn.Linear(dim, dim, bias=qkv_bias)
self.wv = nn.Linear(dim, dim, bias=qkv_bias)
self.attn_drop = nn.Dropout(attn_drop)
self.proj = nn.Linear(dim, dim)
self.proj_drop = nn.Dropout(proj_drop)
def forward(self, x):
B, N, C = x.shape
q = self.wq(x[:, 0:1, ...]).reshape(B, 1, self.num_heads, C // self.num_heads).permute(0, 2, 1, 3) # B1C -> B1H(C/H) -> BH1(C/H)
k = self.wk(x).reshape(B, N, self.num_heads, C // self.num_heads).permute(0, 2, 1, 3) # BNC -> BNH(C/H) -> BHN(C/H)
v = self.wv(x).reshape(B, N, self.num_heads, C // self.num_heads).permute(0, 2, 1, 3) # BNC -> BNH(C/H) -> BHN(C/H)
attn = (q @ k.transpose(-2, -1)) * self.scale # BH1(C/H) @ BH(C/H)N -> BH1N
attn = attn.softmax(dim=-1)
attn = self.attn_drop(attn)
x = (attn @ v).transpose(1, 2).reshape(B, 1, C) # (BH1N @ BHN(C/H)) -> BH1(C/H) -> B1H(C/H) -> B1C
x = self.proj(x)
x = self.proj_drop(x)
return x
class CrossAttentionBlock(nn.Module):
def __init__(self, dim, num_heads, mlp_ratio=4., qkv_bias=False, qk_scale=None, drop=0., attn_drop=0.,
drop_path=0., act_layer=nn.GELU, norm_layer=nn.LayerNorm, has_mlp=True):
super().__init__()
self.norm1 = norm_layer(dim)
self.attn = CrossAttention(
dim, num_heads=num_heads, qkv_bias=qkv_bias, qk_scale=qk_scale, attn_drop=attn_drop, proj_drop=drop)
# NOTE: drop path for stochastic depth, we shall see if this is better than dropout here
self.drop_path = DropPath(drop_path) if drop_path > 0. else nn.Identity()
self.has_mlp = has_mlp
if has_mlp:
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)
def forward(self, x):
x = x[:, 0:1, ...] + self.drop_path(self.attn(self.norm1(x)))
if self.has_mlp:
x = x + self.drop_path(self.mlp(self.norm2(x)))
return x
class MultiScaleBlock(nn.Module):
def __init__(self, dim, patches, depth, num_heads, mlp_ratio, qkv_bias=False, qk_scale=None, drop=0., attn_drop=0.,
drop_path=0., act_layer=nn.GELU, norm_layer=nn.LayerNorm):
super().__init__()
num_branches = len(dim)
self.num_branches = num_branches
# different branch could have different embedding size, the first one is the base
self.blocks = nn.ModuleList()
for d in range(num_branches):
tmp = []
for i in range(depth[d]):
tmp.append(
Block(dim=dim[d], num_heads=num_heads[d], mlp_ratio=mlp_ratio[d], qkv_bias=qkv_bias,
drop=drop, attn_drop=attn_drop, drop_path=drop_path[i], norm_layer=norm_layer))
if len(tmp) != 0:
self.blocks.append(nn.Sequential(*tmp))
if len(self.blocks) == 0:
self.blocks = None
self.projs = nn.ModuleList()
for d in range(num_branches):
if dim[d] == dim[(d+1) % num_branches] and False:
tmp = [nn.Identity()]
else:
tmp = [norm_layer(dim[d]), act_layer(), nn.Linear(dim[d], dim[(d+1) % num_branches])]
self.projs.append(nn.Sequential(*tmp))
self.fusion = nn.ModuleList()
for d in range(num_branches):
d_ = (d+1) % num_branches
nh = num_heads[d_]
if depth[-1] == 0: # backward capability:
self.fusion.append(CrossAttentionBlock(dim=dim[d_], num_heads=nh, mlp_ratio=mlp_ratio[d], qkv_bias=qkv_bias, qk_scale=qk_scale,
drop=drop, attn_drop=attn_drop, drop_path=drop_path[-1], norm_layer=norm_layer,
has_mlp=False))
else:
tmp = []
for _ in range(depth[-1]):
tmp.append(CrossAttentionBlock(dim=dim[d_], num_heads=nh, mlp_ratio=mlp_ratio[d], qkv_bias=qkv_bias, qk_scale=qk_scale,
drop=drop, attn_drop=attn_drop, drop_path=drop_path[-1], norm_layer=norm_layer,
has_mlp=False))
self.fusion.append(nn.Sequential(*tmp))
self.revert_projs = nn.ModuleList()
for d in range(num_branches):
if dim[(d+1) % num_branches] == dim[d] and False:
tmp = [nn.Identity()]
else:
tmp = [norm_layer(dim[(d+1) % num_branches]), act_layer(), nn.Linear(dim[(d+1) % num_branches], dim[d])]
self.revert_projs.append(nn.Sequential(*tmp))
def forward(self, x):
outs_b = [block(x_) for x_, block in zip(x, self.blocks)]
# only take the cls token out
proj_cls_token = [proj(x[:, 0:1]) for x, proj in zip(outs_b, self.projs)]
# cross attention
outs = []
for i in range(self.num_branches):
tmp = torch.cat((proj_cls_token[i], outs_b[(i + 1) % self.num_branches][:, 1:, ...]), dim=1)
tmp = self.fusion[i](tmp)
reverted_proj_cls_token = self.revert_projs[i](tmp[:, 0:1, ...])
tmp = torch.cat((reverted_proj_cls_token, outs_b[i][:, 1:, ...]), dim=1)
outs.append(tmp)
return outs
def _compute_num_patches(img_size, patches):
return [i // p * i // p for i, p in zip(img_size,patches)]
class VisionTransformer(nn.Module):
""" Vision Transformer with support for patch or hybrid CNN input stage
"""
def __init__(self, img_size=(224, 224), patch_size=(8, 16), in_chans=3, num_classes=1000, embed_dim=(192, 384), depth=([1, 3, 1], [1, 3, 1], [1, 3, 1]),
num_heads=(6, 12), mlp_ratio=(2., 2., 4.), qkv_bias=False, qk_scale=None, drop_rate=0., attn_drop_rate=0.,
drop_path_rate=0., hybrid_backbone=None, norm_layer=nn.LayerNorm, multi_conv=False):
super().__init__()
self.num_classes = num_classes
if not isinstance(img_size, list):
img_size = to_2tuple(img_size)
self.img_size = img_size
num_patches = _compute_num_patches(img_size, patch_size)
self.num_branches = len(patch_size)
self.patch_embed = nn.ModuleList()
if hybrid_backbone is None:
self.pos_embed = nn.ParameterList([nn.Parameter(torch.zeros(1, 1 + num_patches[i], embed_dim[i])) for i in range(self.num_branches)])
for im_s, p, d in zip(img_size, patch_size, embed_dim):
self.patch_embed.append(PatchEmbed(img_size=im_s, patch_size=p, in_chans=in_chans, embed_dim=d, multi_conv=multi_conv))
else:
self.pos_embed = nn.ParameterList()
from .t2t import T2T, get_sinusoid_encoding
tokens_type = 'transformer' if hybrid_backbone == 't2t' else 'performer'
for idx, (im_s, p, d) in enumerate(zip(img_size, patch_size, embed_dim)):
self.patch_embed.append(T2T(im_s, tokens_type=tokens_type, patch_size=p, embed_dim=d))
self.pos_embed.append(nn.Parameter(data=get_sinusoid_encoding(n_position=1 + num_patches[idx], d_hid=embed_dim[idx]), requires_grad=False))
del self.pos_embed
self.pos_embed = nn.ParameterList([nn.Parameter(torch.zeros(1, 1 + num_patches[i], embed_dim[i])) for i in range(self.num_branches)])
self.cls_token = nn.ParameterList([nn.Parameter(torch.zeros(1, 1, embed_dim[i])) for i in range(self.num_branches)])
self.pos_drop = nn.Dropout(p=drop_rate)
total_depth = sum([sum(x[-2:]) for x in depth])
dpr = [x.item() for x in torch.linspace(0, drop_path_rate, total_depth)] # stochastic depth decay rule
dpr_ptr = 0
self.blocks = nn.ModuleList()
for idx, block_cfg in enumerate(depth):
curr_depth = max(block_cfg[:-1]) + block_cfg[-1]
dpr_ = dpr[dpr_ptr:dpr_ptr + curr_depth]
blk = MultiScaleBlock(embed_dim, num_patches, block_cfg, num_heads=num_heads, mlp_ratio=mlp_ratio,
qkv_bias=qkv_bias, qk_scale=qk_scale, drop=drop_rate, attn_drop=attn_drop_rate, drop_path=dpr_,
norm_layer=norm_layer)
dpr_ptr += curr_depth
self.blocks.append(blk)
self.norm = nn.ModuleList([norm_layer(embed_dim[i]) for i in range(self.num_branches)])
self.head = nn.ModuleList([nn.Linear(embed_dim[i], num_classes) if num_classes > 0 else nn.Identity() for i in range(self.num_branches)])
for i in range(self.num_branches):
if self.pos_embed[i].requires_grad:
trunc_normal_(self.pos_embed[i], std=.02)
trunc_normal_(self.cls_token[i], std=.02)
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):
out = {'cls_token'}
if self.pos_embed[0].requires_grad:
out.add('pos_embed')
return out
def get_classifier(self):
return self.head
def reset_classifier(self, num_classes, global_pool=''):
self.num_classes = num_classes
self.head = nn.Linear(self.embed_dim, num_classes) if num_classes > 0 else nn.Identity()
def forward_features(self, x):
B, C, H, W = x.shape
xs = []
for i in range(self.num_branches):
x_ = torch.nn.functional.interpolate(x, size=(self.img_size[i], self.img_size[i]), mode='bicubic') if H != self.img_size[i] else x
tmp = self.patch_embed[i](x_)
cls_tokens = self.cls_token[i].expand(B, -1, -1) # stole cls_tokens impl from Phil Wang, thanks
tmp = torch.cat((cls_tokens, tmp), dim=1)
tmp = tmp + self.pos_embed[i]
tmp = self.pos_drop(tmp)
xs.append(tmp)
for blk in self.blocks:
xs = blk(xs)
# NOTE: was before branch token section, move to here to assure all branch token are before layer norm
xs = [self.norm[i](x) for i, x in enumerate(xs)]
out = [x[:, 0] for x in xs]
return out
def forward(self, x):
xs = self.forward_features(x)
ce_logits = [self.head[i](x) for i, x in enumerate(xs)]
ce_logits = torch.mean(torch.stack(ce_logits, dim=0), dim=0)
return ce_logits
@register_model
def crossvit_tiny_224(pretrained=False, **kwargs):
model = VisionTransformer(img_size=[240, 224],
patch_size=[12, 16], embed_dim=[96, 192], depth=[[1, 4, 0], [1, 4, 0], [1, 4, 0]],
num_heads=[3, 3], mlp_ratio=[4, 4, 1], qkv_bias=True,
norm_layer=partial(nn.LayerNorm, eps=1e-6), **kwargs)
model.default_cfg = _cfg()
if pretrained:
state_dict = torch.hub.load_state_dict_from_url(_model_urls['crossvit_tiny_224'], map_location='cpu')
model.load_state_dict(state_dict)
return model
@register_model
def crossvit_small_224(pretrained=False, **kwargs):
model = VisionTransformer(img_size=[240, 224],
patch_size=[12, 16], embed_dim=[192, 384], depth=[[1, 4, 0], [1, 4, 0], [1, 4, 0]],
num_heads=[6, 6], mlp_ratio=[4, 4, 1], qkv_bias=True,
norm_layer=partial(nn.LayerNorm, eps=1e-6), **kwargs)
model.default_cfg = _cfg()
if pretrained:
state_dict = torch.hub.load_state_dict_from_url(_model_urls['crossvit_small_224'], map_location='cpu')
model.load_state_dict(state_dict)
return model
@register_model
def crossvit_base_224(pretrained=False, **kwargs):
model = VisionTransformer(img_size=[240, 224],
patch_size=[12, 16], embed_dim=[384, 768], depth=[[1, 4, 0], [1, 4, 0], [1, 4, 0]],
num_heads=[12, 12], mlp_ratio=[4, 4, 1], qkv_bias=True,
norm_layer=partial(nn.LayerNorm, eps=1e-6), **kwargs)
model.default_cfg = _cfg()
if pretrained:
state_dict = torch.hub.load_state_dict_from_url(_model_urls['crossvit_base_224'], map_location='cpu')
model.load_state_dict(state_dict)
return model
@register_model
def crossvit_9_224(pretrained=False, **kwargs):
model = VisionTransformer(img_size=[240, 224],
patch_size=[12, 16], embed_dim=[128, 256], depth=[[1, 3, 0], [1, 3, 0], [1, 3, 0]],
num_heads=[4, 4], mlp_ratio=[3, 3, 1], qkv_bias=True,
norm_layer=partial(nn.LayerNorm, eps=1e-6), **kwargs)
model.default_cfg = _cfg()
if pretrained:
state_dict = torch.hub.load_state_dict_from_url(_model_urls['crossvit_9_224'], map_location='cpu')
model.load_state_dict(state_dict)
return model
@register_model
def crossvit_15_224(pretrained=False, **kwargs):
model = VisionTransformer(img_size=[240, 224],
patch_size=[12, 16], embed_dim=[192, 384], depth=[[1, 5, 0], [1, 5, 0], [1, 5, 0]],
num_heads=[6, 6], mlp_ratio=[3, 3, 1], qkv_bias=True,
norm_layer=partial(nn.LayerNorm, eps=1e-6), **kwargs)
model.default_cfg = _cfg()
if pretrained:
state_dict = torch.hub.load_state_dict_from_url(_model_urls['crossvit_15_224'], map_location='cpu')
model.load_state_dict(state_dict)
return model
@register_model
def crossvit_18_224(pretrained=False, **kwargs):
model = VisionTransformer(img_size=[240, 224],
patch_size=[12, 16], embed_dim=[224, 448], depth=[[1, 6, 0], [1, 6, 0], [1, 6, 0]],
num_heads=[7, 7], mlp_ratio=[3, 3, 1], qkv_bias=True,
norm_layer=partial(nn.LayerNorm, eps=1e-6), **kwargs)
model.default_cfg = _cfg()
if pretrained:
state_dict = torch.hub.load_state_dict_from_url(_model_urls['crossvit_18_224'], map_location='cpu')
model.load_state_dict(state_dict)
return model
@register_model
def crossvit_9_dagger_224(pretrained=False, **kwargs):
model = VisionTransformer(img_size=[240, 224],
patch_size=[12, 16], embed_dim=[128, 256], depth=[[1, 3, 0], [1, 3, 0], [1, 3, 0]],
num_heads=[4, 4], mlp_ratio=[3, 3, 1], qkv_bias=True,
norm_layer=partial(nn.LayerNorm, eps=1e-6), multi_conv=True, **kwargs)
model.default_cfg = _cfg()
if pretrained:
state_dict = torch.hub.load_state_dict_from_url(_model_urls['crossvit_9_dagger_224'], map_location='cpu')
model.load_state_dict(state_dict)
return model
@register_model
def crossvit_15_dagger_224(pretrained=False, **kwargs):
model = VisionTransformer(img_size=[240, 224],
patch_size=[12, 16], embed_dim=[192, 384], depth=[[1, 5, 0], [1, 5, 0], [1, 5, 0]],
num_heads=[6, 6], mlp_ratio=[3, 3, 1], qkv_bias=True,
norm_layer=partial(nn.LayerNorm, eps=1e-6), multi_conv=True, **kwargs)
model.default_cfg = _cfg()
if pretrained:
state_dict = torch.hub.load_state_dict_from_url(_model_urls['crossvit_15_dagger_224'], map_location='cpu')
model.load_state_dict(state_dict)
return model
@register_model
def crossvit_15_dagger_384(pretrained=False, **kwargs):
model = VisionTransformer(img_size=[408, 384],
patch_size=[12, 16], embed_dim=[192, 384], depth=[[1, 5, 0], [1, 5, 0], [1, 5, 0]],
num_heads=[6, 6], mlp_ratio=[3, 3, 1], qkv_bias=True,
norm_layer=partial(nn.LayerNorm, eps=1e-6), multi_conv=True, **kwargs)
model.default_cfg = _cfg()
if pretrained:
state_dict = torch.hub.load_state_dict_from_url(_model_urls['crossvit_15_dagger_384'], map_location='cpu')
model.load_state_dict(state_dict)
return model
@register_model
def crossvit_18_dagger_224(pretrained=False, **kwargs):
model = VisionTransformer(img_size=[240, 224],
patch_size=[12, 16], embed_dim=[224, 448], depth=[[1, 6, 0], [1, 6, 0], [1, 6, 0]],
num_heads=[7, 7], mlp_ratio=[3, 3, 1], qkv_bias=True,
norm_layer=partial(nn.LayerNorm, eps=1e-6), multi_conv=True, **kwargs)
model.default_cfg = _cfg()
if pretrained:
state_dict = torch.hub.load_state_dict_from_url(_model_urls['crossvit_18_dagger_224'], map_location='cpu')
model.load_state_dict(state_dict)
return model
@register_model
def crossvit_18_dagger_384(pretrained=False, **kwargs):
model = VisionTransformer(img_size=[408, 384],
patch_size=[12, 16], embed_dim=[224, 448], depth=[[1, 6, 0], [1, 6, 0], [1, 6, 0]],
num_heads=[7, 7], mlp_ratio=[3, 3, 1], qkv_bias=True,
norm_layer=partial(nn.LayerNorm, eps=1e-6), multi_conv=True, **kwargs)
model.default_cfg = _cfg()
if pretrained:
state_dict = torch.hub.load_state_dict_from_url(_model_urls['crossvit_18_dagger_384'], map_location='cpu')
model.load_state_dict(state_dict)
return model