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- # Copyright (c) Meta Platforms, Inc. and affiliates.
- # All rights reserved.
-
- import torch
- import torch.nn as nn
- from functools import partial
-
- from timm.models.vision_transformer import Mlp, PatchEmbed , _cfg
-
- from timm.models.layers import DropPath, to_2tuple, trunc_normal_
- from timm.models.registry import register_model
-
- class Attention(nn.Module):
- # taken from https://github.com/rwightman/pytorch-image-models/blob/master/timm/models/vision_transformer.py
- 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
- self.scale = qk_scale or head_dim ** -0.5
-
- 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)
-
- def forward(self, x):
- 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]
-
- q = q * self.scale
-
- attn = (q @ k.transpose(-2, -1))
- attn = attn.softmax(dim=-1)
- 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
-
- class Block(nn.Module):
- # taken from https://github.com/rwightman/pytorch-image-models/blob/master/timm/models/vision_transformer.py
- 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,Attention_block = Attention,Mlp_block=Mlp
- ,init_values=1e-4):
- super().__init__()
- self.norm1 = norm_layer(dim)
- self.attn = Attention_block(
- 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.norm2 = norm_layer(dim)
- mlp_hidden_dim = int(dim * mlp_ratio)
- self.mlp = Mlp_block(in_features=dim, hidden_features=mlp_hidden_dim, act_layer=act_layer, drop=drop)
-
- def forward(self, x):
- x = x + self.drop_path(self.attn(self.norm1(x)))
- x = x + self.drop_path(self.mlp(self.norm2(x)))
- return x
-
- class Layer_scale_init_Block(nn.Module):
- # taken from https://github.com/rwightman/pytorch-image-models/blob/master/timm/models/vision_transformer.py
- # with slight modifications
- 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,Attention_block = Attention,Mlp_block=Mlp
- ,init_values=1e-4):
- super().__init__()
- self.norm1 = norm_layer(dim)
- self.attn = Attention_block(
- 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.norm2 = norm_layer(dim)
- mlp_hidden_dim = int(dim * mlp_ratio)
- self.mlp = Mlp_block(in_features=dim, hidden_features=mlp_hidden_dim, act_layer=act_layer, drop=drop)
- self.gamma_1 = nn.Parameter(init_values * torch.ones((dim)),requires_grad=True)
- self.gamma_2 = nn.Parameter(init_values * torch.ones((dim)),requires_grad=True)
-
- def forward(self, x):
- x = x + self.drop_path(self.gamma_1 * self.attn(self.norm1(x)))
- x = x + self.drop_path(self.gamma_2 * self.mlp(self.norm2(x)))
- return x
-
- class Layer_scale_init_Block_paralx2(nn.Module):
- # taken from https://github.com/rwightman/pytorch-image-models/blob/master/timm/models/vision_transformer.py
- # with slight modifications
- 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,Attention_block = Attention,Mlp_block=Mlp
- ,init_values=1e-4):
- super().__init__()
- self.norm1 = norm_layer(dim)
- self.norm11 = norm_layer(dim)
- self.attn = Attention_block(
- 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.attn1 = Attention_block(
- dim, 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)
- self.norm21 = norm_layer(dim)
- mlp_hidden_dim = int(dim * mlp_ratio)
- self.mlp = Mlp_block(in_features=dim, hidden_features=mlp_hidden_dim, act_layer=act_layer, drop=drop)
- self.mlp1 = Mlp_block(in_features=dim, hidden_features=mlp_hidden_dim, act_layer=act_layer, drop=drop)
- self.gamma_1 = nn.Parameter(init_values * torch.ones((dim)),requires_grad=True)
- self.gamma_1_1 = nn.Parameter(init_values * torch.ones((dim)),requires_grad=True)
- self.gamma_2 = nn.Parameter(init_values * torch.ones((dim)),requires_grad=True)
- self.gamma_2_1 = nn.Parameter(init_values * torch.ones((dim)),requires_grad=True)
-
- def forward(self, x):
- x = x + self.drop_path(self.gamma_1*self.attn(self.norm1(x))) + self.drop_path(self.gamma_1_1 * self.attn1(self.norm11(x)))
- x = x + self.drop_path(self.gamma_2 * self.mlp(self.norm2(x))) + self.drop_path(self.gamma_2_1 * self.mlp1(self.norm21(x)))
- return x
-
- class Block_paralx2(nn.Module):
- # taken from https://github.com/rwightman/pytorch-image-models/blob/master/timm/models/vision_transformer.py
- # with slight modifications
- 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,Attention_block = Attention,Mlp_block=Mlp
- ,init_values=1e-4):
- super().__init__()
- self.norm1 = norm_layer(dim)
- self.norm11 = norm_layer(dim)
- self.attn = Attention_block(
- 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.attn1 = Attention_block(
- dim, 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)
- self.norm21 = norm_layer(dim)
- mlp_hidden_dim = int(dim * mlp_ratio)
- self.mlp = Mlp_block(in_features=dim, hidden_features=mlp_hidden_dim, act_layer=act_layer, drop=drop)
- self.mlp1 = Mlp_block(in_features=dim, hidden_features=mlp_hidden_dim, act_layer=act_layer, drop=drop)
-
- def forward(self, x):
- x = x + self.drop_path(self.attn(self.norm1(x))) + self.drop_path(self.attn1(self.norm11(x)))
- x = x + self.drop_path(self.mlp(self.norm2(x))) + self.drop_path(self.mlp1(self.norm21(x)))
- return x
-
-
- class hMLP_stem(nn.Module):
- """ hMLP_stem: https://arxiv.org/pdf/2203.09795.pdf
- taken from https://github.com/rwightman/pytorch-image-models/blob/master/timm/models/vision_transformer.py
- with slight modifications
- """
- def __init__(self, img_size=224, patch_size=16, in_chans=3, embed_dim=768,norm_layer=nn.SyncBatchNorm):
- 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
- self.proj = torch.nn.Sequential(*[nn.Conv2d(in_chans, embed_dim//4, kernel_size=4, stride=4),
- norm_layer(embed_dim//4),
- nn.GELU(),
- nn.Conv2d(embed_dim//4, embed_dim//4, kernel_size=2, stride=2),
- norm_layer(embed_dim//4),
- nn.GELU(),
- nn.Conv2d(embed_dim//4, embed_dim, kernel_size=2, stride=2),
- norm_layer(embed_dim),
- ])
-
-
- def forward(self, x):
- B, C, H, W = x.shape
- x = self.proj(x).flatten(2).transpose(1, 2)
- return x
-
- class vit_models(nn.Module):
- """ Vision Transformer with LayerScale (https://arxiv.org/abs/2103.17239) support
- taken from https://github.com/rwightman/pytorch-image-models/blob/master/timm/models/vision_transformer.py
- with slight modifications
- """
- def __init__(self, img_size=224, patch_size=16, in_chans=3, num_classes=1000, embed_dim=768, depth=12,
- num_heads=12, mlp_ratio=4., qkv_bias=False, qk_scale=None, drop_rate=0., attn_drop_rate=0.,
- drop_path_rate=0., norm_layer=nn.LayerNorm, global_pool=None,
- block_layers = Block,
- Patch_layer=PatchEmbed,act_layer=nn.GELU,
- Attention_block = Attention, Mlp_block=Mlp,
- dpr_constant=True,init_scale=1e-4,
- mlp_ratio_clstk = 4.0):
- super().__init__()
-
- self.dropout_rate = drop_rate
-
-
- self.num_classes = num_classes
- self.num_features = self.embed_dim = embed_dim
-
- self.patch_embed = Patch_layer(
- img_size=img_size, patch_size=patch_size, in_chans=in_chans, embed_dim=embed_dim)
- num_patches = self.patch_embed.num_patches
-
- self.cls_token = nn.Parameter(torch.zeros(1, 1, embed_dim))
-
- self.pos_embed = nn.Parameter(torch.zeros(1, num_patches, embed_dim))
-
- dpr = [drop_path_rate for i in range(depth)]
- self.blocks = nn.ModuleList([
- block_layers(
- dim=embed_dim, num_heads=num_heads, mlp_ratio=mlp_ratio, qkv_bias=qkv_bias, qk_scale=qk_scale,
- drop=0.0, attn_drop=attn_drop_rate, drop_path=dpr[i], norm_layer=norm_layer,
- act_layer=act_layer,Attention_block=Attention_block,Mlp_block=Mlp_block,init_values=init_scale)
- for i in range(depth)])
-
-
-
-
- self.norm = norm_layer(embed_dim)
-
- self.feature_info = [dict(num_chs=embed_dim, reduction=0, module='head')]
- self.head = nn.Linear(embed_dim, num_classes) if num_classes > 0 else nn.Identity()
-
- trunc_normal_(self.pos_embed, std=.02)
- trunc_normal_(self.cls_token, 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):
- return {'pos_embed', 'cls_token'}
-
- def get_classifier(self):
- return self.head
-
- def get_num_layers(self):
- return len(self.blocks)
-
- 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 = x.shape[0]
- x = self.patch_embed(x)
-
- cls_tokens = self.cls_token.expand(B, -1, -1)
-
- x = x + self.pos_embed
-
- x = torch.cat((cls_tokens, x), dim=1)
-
- for i , blk in enumerate(self.blocks):
- x = blk(x)
-
- x = self.norm(x)
- return x[:, 0]
-
- def forward(self, x):
-
- x = self.forward_features(x)
-
- if self.dropout_rate:
- x = F.dropout(x, p=float(self.dropout_rate), training=self.training)
- x = self.head(x)
-
- return x
-
- # DeiT III: Revenge of the ViT (https://arxiv.org/abs/2204.07118)
-
- @register_model
- def deit_tiny_patch16_LS(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=16, embed_dim=192, depth=12, num_heads=3, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers=Layer_scale_init_Block, **kwargs)
-
- return model
-
-
- @register_model
- def deit_small_patch16_LS(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=16, embed_dim=384, depth=12, num_heads=6, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers=Layer_scale_init_Block, **kwargs)
- model.default_cfg = _cfg()
- if pretrained:
- name = 'https://dl.fbaipublicfiles.com/deit/deit_3_small_'+str(img_size)+'_'
- if pretrained_21k:
- name+='21k.pth'
- else:
- name+='1k.pth'
-
- checkpoint = torch.hub.load_state_dict_from_url(
- url=name,
- map_location="cpu", check_hash=True
- )
- model.load_state_dict(checkpoint["model"])
-
- return model
-
- @register_model
- def deit_medium_patch16_LS(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- patch_size=16, embed_dim=512, depth=12, num_heads=8, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers = Layer_scale_init_Block, **kwargs)
- model.default_cfg = _cfg()
- if pretrained:
- name = 'https://dl.fbaipublicfiles.com/deit/deit_3_medium_'+str(img_size)+'_'
- if pretrained_21k:
- name+='21k.pth'
- else:
- name+='1k.pth'
-
- checkpoint = torch.hub.load_state_dict_from_url(
- url=name,
- map_location="cpu", check_hash=True
- )
- model.load_state_dict(checkpoint["model"])
- return model
-
- @register_model
- def deit_base_patch16_LS(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=16, embed_dim=768, depth=12, num_heads=12, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers=Layer_scale_init_Block, **kwargs)
- if pretrained:
- name = 'https://dl.fbaipublicfiles.com/deit/deit_3_base_'+str(img_size)+'_'
- if pretrained_21k:
- name+='21k.pth'
- else:
- name+='1k.pth'
-
- checkpoint = torch.hub.load_state_dict_from_url(
- url=name,
- map_location="cpu", check_hash=True
- )
- model.load_state_dict(checkpoint["model"])
- return model
-
- @register_model
- def deit_large_patch16_LS(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=16, embed_dim=1024, depth=24, num_heads=16, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers=Layer_scale_init_Block, **kwargs)
- if pretrained:
- name = 'https://dl.fbaipublicfiles.com/deit/deit_3_large_'+str(img_size)+'_'
- if pretrained_21k:
- name+='21k.pth'
- else:
- name+='1k.pth'
-
- checkpoint = torch.hub.load_state_dict_from_url(
- url=name,
- map_location="cpu", check_hash=True
- )
- model.load_state_dict(checkpoint["model"])
- return model
-
- @register_model
- def deit_huge_patch14_LS(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=14, embed_dim=1280, depth=32, num_heads=16, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers = Layer_scale_init_Block, **kwargs)
- if pretrained:
- name = 'https://dl.fbaipublicfiles.com/deit/deit_3_huge_'+str(img_size)+'_'
- if pretrained_21k:
- name+='21k_v1.pth'
- else:
- name+='1k_v1.pth'
-
- checkpoint = torch.hub.load_state_dict_from_url(
- url=name,
- map_location="cpu", check_hash=True
- )
- model.load_state_dict(checkpoint["model"])
- return model
-
- @register_model
- def deit_huge_patch14_52_LS(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=14, embed_dim=1280, depth=52, num_heads=16, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers = Layer_scale_init_Block, **kwargs)
-
- return model
-
- @register_model
- def deit_huge_patch14_26x2_LS(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=14, embed_dim=1280, depth=26, num_heads=16, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers = Layer_scale_init_Block_paralx2, **kwargs)
-
- return model
-
- @register_model
- def deit_Giant_48x2_patch14_LS(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=14, embed_dim=1664, depth=48, num_heads=16, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers = Block_paral_LS, **kwargs)
-
- return model
-
- @register_model
- def deit_giant_40x2_patch14_LS(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=14, embed_dim=1408, depth=40, num_heads=16, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers = Block_paral_LS, **kwargs)
- return model
-
- @register_model
- def deit_Giant_48_patch14_LS(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=14, embed_dim=1664, depth=48, num_heads=16, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers = Layer_scale_init_Block, **kwargs)
- return model
-
- @register_model
- def deit_giant_40_patch14_LS(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=14, embed_dim=1408, depth=40, num_heads=16, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers = Layer_scale_init_Block, **kwargs)
- #model.default_cfg = _cfg()
-
- return model
-
- # Models from Three things everyone should know about Vision Transformers (https://arxiv.org/pdf/2203.09795.pdf)
-
- @register_model
- def deit_small_patch16_36_LS(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=16, embed_dim=384, depth=36, num_heads=6, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers=Layer_scale_init_Block, **kwargs)
-
- return model
-
- @register_model
- def deit_small_patch16_36(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=16, embed_dim=384, depth=36, num_heads=6, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6), **kwargs)
-
- return model
-
- @register_model
- def deit_small_patch16_18x2_LS(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=16, embed_dim=384, depth=18, num_heads=6, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers=Layer_scale_init_Block_paralx2, **kwargs)
-
- return model
-
- @register_model
- def deit_small_patch16_18x2(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=16, embed_dim=384, depth=18, num_heads=6, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers=Block_paralx2, **kwargs)
-
- return model
-
-
- @register_model
- def deit_base_patch16_18x2_LS(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=16, embed_dim=768, depth=18, num_heads=12, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers=Layer_scale_init_Block_paralx2, **kwargs)
-
- return model
-
-
- @register_model
- def deit_base_patch16_18x2(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=16, embed_dim=768, depth=18, num_heads=12, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers=Block_paralx2, **kwargs)
-
- return model
-
-
- @register_model
- def deit_base_patch16_36x1_LS(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=16, embed_dim=768, depth=36, num_heads=12, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6),block_layers=Layer_scale_init_Block, **kwargs)
-
- return model
-
- @register_model
- def deit_base_patch16_36x1(pretrained=False, img_size=224, pretrained_21k = False, **kwargs):
- model = vit_models(
- img_size = img_size, patch_size=16, embed_dim=768, depth=36, num_heads=12, mlp_ratio=4, qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6), **kwargs)
-
- return model
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