|
- import torch
- import torch.nn as nn
- import torch.nn.functional as F
- 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
- import math
-
-
- class Mlp(nn.Module):
- def __init__(self, in_features, hidden_features=None, out_features=None, act_layer=nn.GELU, drop=0., linear=False):
- 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.dwconv = DWConv(hidden_features)
- self.act = act_layer()
- self.fc2 = nn.Linear(hidden_features, out_features)
- self.drop = nn.Dropout(drop)
- self.linear = linear
- if self.linear:
- self.relu = nn.ReLU(inplace=True)
- 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)
- elif isinstance(m, nn.Conv2d):
- fan_out = m.kernel_size[0] * m.kernel_size[1] * m.out_channels
- fan_out //= m.groups
- m.weight.data.normal_(0, math.sqrt(2.0 / fan_out))
- if m.bias is not None:
- m.bias.data.zero_()
-
- def forward(self, x, H, W):
- x = self.fc1(x)
- if self.linear:
- x = self.relu(x)
- x = self.dwconv(x, H, W)
- x = self.act(x)
- x = self.drop(x)
- x = self.fc2(x)
- x = self.drop(x)
- return x
-
-
- # class CenterAttention_max_pool(nn.Module):
- # """
- # """
- # # self.attn = CenterAttention(
- # # dim=dim,
- # # num_heads=num_heads, qkv_bias=qkv_bias, qk_scale=qk_scale,
- # # attn_drop=attn_drop, proj_drop=drop)
- # def __init__(self,
- # dim,
- # num_heads=1,
- # qkv_bias=True,
- # qk_scale=None,
- # attn_drop=0.,
- # proj_drop=0.,
- # stride=1,
- # padding=True,
- # kernel_size=3):
- # super().__init__()
- # assert dim % num_heads == 0, f"dim {dim} should be divided by num_heads {num_heads}."
- # self.k_size = kernel_size # kernel size
- # self.stride = stride # stride
- # # self.pat_size = patch_size # patch size
- #
- # self.in_channels = dim # origin channel is 3, patch channel is in_channel
- # self.num_heads = num_heads
- # self.head_channel = dim // num_heads
- # # self.dim = dim # patch embedding dim
- # # it seems that padding must be true to make unfolded dim matchs query dim h*w*ks*ks
- # self.pad_size = kernel_size // 2 if padding is True else 0 # padding size
- # self.pad = nn.ZeroPad2d(self.pad_size) # padding around the input
- # self.scale = qk_scale or (dim // num_heads)**-0.5
- # self.unfold = nn.Unfold(kernel_size=self.k_size, stride=self.stride, padding=0, dilation=1)
- # self.maxpool = nn.MaxPool2d(kernel_size=3, stride=1, padding=1)
- # # self.avgpool = nn.AvgPool2d(kernel_size=3, stride=1, padding=1)
- # self.qkv_bias = qkv_bias
- # self.q_proj = nn.Linear(dim, dim, bias=qkv_bias)
- # self.kv_proj = nn.Linear(dim, dim * 2, bias=qkv_bias)
- # self.attn_drop = nn.Dropout(attn_drop)
- # self.softmax = nn.Softmax(dim=-1)
- # self.proj = nn.Linear(dim, dim)
- # self.proj_drop = nn.Dropout(proj_drop)
- #
- # 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)
- # elif isinstance(m, nn.Conv2d):
- # fan_out = m.kernel_size[0] * m.kernel_size[1] * m.out_channels
- # fan_out //= m.groups
- # m.weight.data.normal_(0, math.sqrt(2.0 / fan_out))
- # if m.bias is not None:
- # m.bias.data.zero_()
- #
- # def forward(self, x, H, W):
- # B, N, C = x.shape
- # x = x.reshape(B, H, W, C)
- # assert C == self.in_channels
- #
- # self.pat_size_h = (H+2 * self.pad_size-self.k_size) // self.stride+1
- # self.pat_size_w = (W+2 * self.pad_size-self.k_size) // self.stride+1
- # self.num_patch = self.pat_size_h * self.pat_size_w
- #
- #
- # q = self.q_proj(x) # (B, H, W, C)
- # q = q.permute(0, 3, 1, 2) # (B, C, H, W)
- # q = self.maxpool(q).permute(0, 2, 3, 1) # (B, H, W, C)
- # # q = self.avgpool(q).permute(0, 2, 3, 1) # (B, H, W, C)
- # q = q.reshape(B, H, W, self.num_heads, self.head_channel).permute(0, 3, 1, 2, 4) # (B, NumHeads, H, W, HeadC)
- #
- # # q = self.pad(q).permute(0, 1, 3, 4, 2) # (B, NumH, H, W, HeadC)
- # # query need to be copied by (self.k_size*self.k_size) times
- # q = q.unsqueeze(dim=4)
- # q = q * self.scale
- #
- # # if stride is not 1, q should be masked to match ks*ks*patch
- # # ...
- #
- # # (2, B, NumHeads, HeadsC, H, W)
- # kv = self.kv_proj(x).reshape(B, H, W, 2, self.num_heads, self.head_channel).permute(3, 0, 4, 5, 1, 2)
- #
- # kv = self.pad(kv) # (2, B, NumH, HeadC, H, W)
- # kv = kv.permute(0, 1, 2, 4, 5, 3)
- # H, W = H + self.pad_size * 2, W + self.pad_size * 2
- #
- # # unfold plays role of conv2d to get patch data
- # kv = kv.permute(0, 1, 2, 5, 3, 4).reshape(2 * B, -1, H, W)
- # kv = self.unfold(kv)
- # kv = kv.reshape(2, B, self.num_heads, self.head_channel, self.k_size**2,
- # self.num_patch) # (2, B, NumH, HC, ks*ks, NumPatch)
- # kv = kv.permute(0, 1, 2, 5, 4, 3) # (2, B, NumH, NumPatch, ks*ks, HC)
- # k, v = kv[0], kv[1]
- #
- # # (B, NumH, NumPatch, 1, HeadC)
- # q = q.reshape(B, self.num_heads, self.num_patch, 1, self.head_channel)
- # attn = (q @ k.transpose(-2, -1)) # (B, NumH, NumPatch, ks*ks, ks*ks)
- # attn = self.softmax(attn) # softmax last dim
- # attn = self.attn_drop(attn)
- #
- # out = (attn @ v).squeeze(3) # (B, NumH, NumPatch, HeadC)
- # out = out.permute(0, 2, 1, 3).reshape(B, self.pat_size_h, self.pat_size_w, C) # (B, Ph, Pw, C)
- # out = self.proj(out)
- # out = self.proj_drop(out)
- # out = out.reshape(B, -1, C)
- # return out
- #
- # def flops(self):
- # flops = 0
- # # q_proj and kv_proj
- # flops += (2 * self.in_channels - 0 if self.qkv_bias is True else 1) * self.in_channels * 3
- # # q* self.scale
- # H, W = self.input_resolution
- # flops += H * W * self.in_channels
- # # q@k
- # flops += self.num_heads * self.num_patch * (2 * self.head_channel - 1) * self.k_size**2
- # # attn @ v
- # flops += self.num_heads * self.num_patch * self.k_size**2 * (2 * self.k_size**2 - 1) * self.head_channel
- # # proj out
- # flops += self.pat_size_h * self.pat_size_w * (2 * self.in_channels - 1) * self.in_channels
- #
- # return flops
-
-
- class CenterAttention(nn.Module):
- """
- """
-
- # self.attn = CenterAttention(
- # dim=dim,
- # num_heads=num_heads, qkv_bias=qkv_bias, qk_scale=qk_scale,
- # attn_drop=attn_drop, proj_drop=drop)
- def __init__(self,
- dim,
- num_heads=1,
- qkv_bias=True,
- qk_scale=None,
- attn_drop=0.,
- proj_drop=0.,
- stride=1,
- padding=True,
- kernel_size=3):
- super().__init__()
- assert dim % num_heads == 0, f"dim {dim} should be divided by num_heads {num_heads}."
- self.k_size = kernel_size # kernel size
- self.stride = stride # stride
- # self.pat_size = patch_size # patch size
-
- self.in_channels = dim # origin channel is 3, patch channel is in_channel
- self.num_heads = num_heads
- self.head_channel = dim // num_heads
- # self.dim = dim # patch embedding dim
- # it seems that padding must be true to make unfolded dim matchs query dim h*w*ks*ks
- self.pad_size = kernel_size // 2 if padding is True else 0 # padding size
- self.pad = nn.ZeroPad2d(self.pad_size) # padding around the input
- self.scale = qk_scale or (dim // num_heads) ** -0.5
- self.unfold = nn.Unfold(kernel_size=self.k_size, stride=self.stride, padding=0, dilation=1)
-
- self.qkv_bias = qkv_bias
- self.q_proj = nn.Linear(dim, dim, bias=qkv_bias)
- self.kv_proj = nn.Linear(dim, dim * 2, bias=qkv_bias)
- self.attn_drop = nn.Dropout(attn_drop)
- self.softmax = nn.Softmax(dim=-1)
- self.proj = nn.Linear(dim, dim)
- self.proj_drop = nn.Dropout(proj_drop)
-
- 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)
- elif isinstance(m, nn.Conv2d):
- fan_out = m.kernel_size[0] * m.kernel_size[1] * m.out_channels
- fan_out //= m.groups
- m.weight.data.normal_(0, math.sqrt(2.0 / fan_out))
- if m.bias is not None:
- m.bias.data.zero_()
-
- def forward(self, x, H, W):
- B, N, C = x.shape
- x = x.reshape(B, H, W, C)
- assert C == self.in_channels
-
- self.pat_size_h = (H + 2 * self.pad_size - self.k_size) // self.stride + 1
- self.pat_size_w = (W + 2 * self.pad_size - self.k_size) // self.stride + 1
- self.num_patch = self.pat_size_h * self.pat_size_w
-
- # (B, NumHeads, H, W, HeadC)
- q = self.q_proj(x).reshape(B, H, W, self.num_heads, self.head_channel).permute(0, 3, 1, 2, 4)
- # q = self.pad(q).permute(0, 1, 3, 4, 2) # (B, NumH, H, W, HeadC)
- # query need to be copied by (self.k_size*self.k_size) times
- q = q.unsqueeze(dim=4)
- q = q * self.scale
- # if stride is not 1, q should be masked to match ks*ks*patch
- # ...
-
- # (2, B, NumHeads, HeadsC, H, W)
- kv = self.kv_proj(x).reshape(B, H, W, 2, self.num_heads, self.head_channel).permute(3, 0, 4, 5, 1, 2)
-
- kv = self.pad(kv) # (2, B, NumH, HeadC, H, W)
- kv = kv.permute(0, 1, 2, 4, 5, 3)
- H, W = H + self.pad_size * 2, W + self.pad_size * 2
-
- # unfold plays role of conv2d to get patch data
- kv = kv.permute(0, 1, 2, 5, 3, 4).reshape(2 * B, -1, H, W)
- kv = self.unfold(kv)
- kv = kv.reshape(2, B, self.num_heads, self.head_channel, self.k_size ** 2,
- self.num_patch) # (2, B, NumH, HC, ks*ks, NumPatch)
- kv = kv.permute(0, 1, 2, 5, 4, 3) # (2, B, NumH, NumPatch, ks*ks, HC)
- k, v = kv[0], kv[1]
-
- # (B, NumH, NumPatch, 1, HeadC)
- q = q.reshape(B, self.num_heads, self.num_patch, 1, self.head_channel)
- attn = (q @ k.transpose(-2, -1)) # (B, NumH, NumPatch, ks*ks, ks*ks)
- attn = self.softmax(attn) # softmax last dim
- attn = self.attn_drop(attn)
-
- out = (attn @ v).squeeze(3) # (B, NumH, NumPatch, HeadC)
- out = out.permute(0, 2, 1, 3).reshape(B, self.pat_size_h, self.pat_size_w, C) # (B, Ph, Pw, C)
- out = self.proj(out)
- out = self.proj_drop(out)
- out = out.reshape(B, -1, C)
- return out
-
-
- class Attention(nn.Module):
- def __init__(self, dim, num_heads=8, qkv_bias=False, qk_scale=None, attn_drop=0., proj_drop=0., sr_ratio=1,
- linear=False):
- super().__init__()
- assert dim % num_heads == 0, f"dim {dim} should be divided by num_heads {num_heads}."
-
- self.dim = dim
- self.num_heads = num_heads
- head_dim = dim // num_heads
- self.scale = qk_scale or head_dim ** -0.5
-
- self.q = nn.Linear(dim, dim, bias=qkv_bias)
- self.kv = nn.Linear(dim, dim * 2, bias=qkv_bias)
- self.attn_drop = nn.Dropout(attn_drop)
- self.proj = nn.Linear(dim, dim)
- self.proj_drop = nn.Dropout(proj_drop)
-
- self.linear = linear
- self.sr_ratio = sr_ratio
-
- 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)
- elif isinstance(m, nn.Conv2d):
- fan_out = m.kernel_size[0] * m.kernel_size[1] * m.out_channels
- fan_out //= m.groups
- m.weight.data.normal_(0, math.sqrt(2.0 / fan_out))
- if m.bias is not None:
- m.bias.data.zero_()
-
- def forward(self, x, H, W):
- B, N, C = x.shape
- q = self.q(x).reshape(B, N, self.num_heads, C // self.num_heads).permute(0, 2, 1, 3)
- kv = self.kv(x).reshape(B, -1, 2, self.num_heads, C // self.num_heads).permute(2, 0, 3, 1, 4)
- k, v = kv[0], kv[1]
- attn = (q @ k.transpose(-2, -1)) * self.scale
- 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):
-
- 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, linear=False, last_stage=False):
- super().__init__()
- self.norm1 = norm_layer(dim)
- if not last_stage:
- self.attn = CenterAttention(
- dim=dim,
- num_heads=num_heads, qkv_bias=qkv_bias, qk_scale=qk_scale,
- attn_drop=attn_drop, proj_drop=drop)
- # self.attn = CenterAttention_max_pool(
- # dim=dim,
- # num_heads=num_heads, qkv_bias=qkv_bias, qk_scale=qk_scale,
- # attn_drop=attn_drop, proj_drop=drop)
- else:
- self.attn = Attention(
- dim,
- num_heads=num_heads, qkv_bias=qkv_bias, qk_scale=qk_scale,
- attn_drop=attn_drop, proj_drop=drop, linear=linear)
- 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, linear=linear)
-
- 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)
- elif isinstance(m, nn.Conv2d):
- fan_out = m.kernel_size[0] * m.kernel_size[1] * m.out_channels
- fan_out //= m.groups
- m.weight.data.normal_(0, math.sqrt(2.0 / fan_out))
- if m.bias is not None:
- m.bias.data.zero_()
-
- def forward(self, x, H, W):
- x = x + self.drop_path(self.attn(self.norm1(x), H, W))
- x = x + self.drop_path(self.mlp(self.norm2(x), H, W))
-
- return x
-
-
- class PatchEmbed(nn.Module):
- """ Image to Patch Embedding
- """
-
- def __init__(self, img_size=224, patch_size=16, in_chans=3, embed_dim=768):
- super().__init__()
- img_size = to_2tuple(img_size)
- patch_size = to_2tuple(patch_size)
-
- self.img_size = img_size
- self.patch_size = patch_size
- # assert img_size[0] % patch_size[0] == 0 and img_size[1] % patch_size[1] == 0, \
- # f"img_size {img_size} should be divided by patch_size {patch_size}."
- self.H, self.W = img_size[0] // patch_size[0], img_size[1] // patch_size[1]
- self.num_patches = self.H * self.W
- self.proj = nn.Conv2d(in_chans, embed_dim, kernel_size=patch_size, stride=patch_size)
- self.norm = nn.LayerNorm(embed_dim)
- 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)
- elif isinstance(m, nn.Conv2d):
- fan_out = m.kernel_size[0] * m.kernel_size[1] * m.out_channels
- fan_out //= m.groups
- m.weight.data.normal_(0, math.sqrt(2.0 / fan_out))
- if m.bias is not None:
- m.bias.data.zero_()
-
- def forward(self, x):
- B, C, H, W = x.shape
-
- x = self.proj(x).flatten(2).transpose(1, 2)
- x = self.norm(x)
- H, W = H // self.patch_size[0], W // self.patch_size[1]
-
- return x, H, W
-
-
- class simvit(nn.Module):
- def __init__(self, img_size=224, in_chans=3, num_classes=1000, embed_dims=[64, 128, 256, 512],
- num_heads=[1, 2, 4, 8], mlp_ratios=[4, 4, 4, 4], qkv_bias=False, qk_scale=None, drop_rate=0.,
- attn_drop_rate=0., drop_path_rate=0., norm_layer=nn.LayerNorm,
- depths=[3, 4, 6, 3], num_stages=4, linear=False):
- super().__init__()
- self.num_classes = num_classes
- self.depths = depths
- self.num_stages = num_stages
-
- dpr = [x.item() for x in torch.linspace(0, drop_path_rate, sum(depths))] # stochastic depth decay rule
- cur = 0
-
- for i in range(num_stages):
- patch_embed = PatchEmbed(img_size=img_size if i == 0 else img_size // (2 ** (i + 1)),
- patch_size=4 if i == 0 else 2,
- in_chans=in_chans if i == 0 else embed_dims[i - 1],
- embed_dim=embed_dims[i])
- block = nn.ModuleList([Block(
- dim=embed_dims[i], num_heads=num_heads[i], mlp_ratio=mlp_ratios[i], qkv_bias=qkv_bias,
- qk_scale=qk_scale,
- drop=drop_rate, attn_drop=attn_drop_rate, drop_path=dpr[cur + j], norm_layer=norm_layer,
- linear=linear, last_stage=(i == num_stages - 1))
- for j in range(depths[i])])
-
- norm = norm_layer(embed_dims[i])
- cur += depths[i]
-
- setattr(self, f"patch_embed{i + 1}", patch_embed)
- setattr(self, f"block{i + 1}", block)
- setattr(self, f"norm{i + 1}", norm)
-
- # classification head
- self.head = nn.Linear(embed_dims[3], num_classes) if num_classes > 0 else nn.Identity()
-
- 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)
- elif isinstance(m, nn.Conv2d):
- fan_out = m.kernel_size[0] * m.kernel_size[1] * m.out_channels
- fan_out //= m.groups
- m.weight.data.normal_(0, math.sqrt(2.0 / fan_out))
- if m.bias is not None:
- m.bias.data.zero_()
-
- def freeze_patch_emb(self):
- self.patch_embed1.requires_grad = False
-
- @torch.jit.ignore
- def no_weight_decay(self):
- return {'pos_embed1', 'pos_embed2', 'pos_embed3', 'pos_embed4', 'cls_token'}
-
- 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 = x.shape[0]
- outs = []
- for i in range(self.num_stages):
- patch_embed = getattr(self, f"patch_embed{i + 1}")
- block = getattr(self, f"block{i + 1}")
- norm = getattr(self, f"norm{i + 1}")
- x, H, W = patch_embed(x)
- for blk in block:
- x = blk(x, H, W)
- x = norm(x)
- outs.append(x.reshape(B, H, W, -1).permute(0, 3, 1, 2))
- if i != self.num_stages - 1:
- x = x.reshape(B, H, W, -1).permute(0, 3, 1, 2).contiguous()
-
- return outs
-
- def forward(self, x):
- x = self.forward_features(x)
- # print(x[0].shape)
- # x = self.head(x)
-
- return x
-
-
- class DWConv(nn.Module):
- def __init__(self, dim=768):
- super(DWConv, self).__init__()
- self.dwconv = nn.Conv2d(dim, dim, 3, 1, 1, bias=True, groups=dim)
-
- def forward(self, x, H, W):
- B, N, C = x.shape
- x = x.transpose(1, 2).view(B, C, H, W)
- x = self.dwconv(x)
- x = x.flatten(2).transpose(1, 2)
-
- return x
-
-
- def _conv_filter(state_dict, patch_size=16):
- """ convert patch embedding weight from manual patchify + linear proj to conv"""
- out_dict = {}
- for k, v in state_dict.items():
- if 'patch_embed.proj.weight' in k:
- v = v.reshape((v.shape[0], 3, patch_size, patch_size))
- out_dict[k] = v
-
- return out_dict
-
-
- @register_model
- def simvit_micro(pretrained=False, **kwargs): # source:3.4M 0.6G ours:3.33M 0.65G 192.168.20.6
- model = simvit(
- embed_dims=[32, 64, 160, 256], num_heads=[1, 2, 5, 8], mlp_ratios=[8, 8, 4, 4], qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6), depths=[2, 3, 3, 2], **kwargs)
- model.default_cfg = _cfg()
-
- return model
-
-
- @register_model
- def simvit_tiny(pretrained=False, **kwargs): # source:13.1M 2.1G ours:12.99M 2.51G 192.168.20.7
- model = simvit(
- embed_dims=[64, 128, 320, 512], num_heads=[1, 2, 5, 8], mlp_ratios=[8, 8, 4, 4], qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6), depths=[2, 4, 3, 2], **kwargs)
- model.default_cfg = _cfg()
-
- return model
-
-
- @register_model
- def simvit_small(pretrained=False, **kwargs):
- model = simvit(
- embed_dims=[64, 128, 320, 512], num_heads=[1, 2, 5, 8], mlp_ratios=[8, 8, 4, 4], qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6), depths=[3, 6, 13, 3], **kwargs)
- model.default_cfg = _cfg()
-
- return model
-
-
- @register_model
- def simvit_medium(pretrained=False, **kwargs): # 51.3 M 10.9G
- model = simvit(
- embed_dims=[64, 128, 320, 512], num_heads=[1, 2, 5, 8], mlp_ratios=[8, 8, 4, 4], qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6), depths=[3, 8, 30, 3], **kwargs)
- model.default_cfg = _cfg()
- return model
-
-
- @register_model
- def simvit_large(pretrained=False, **kwargs): # 62.51M 12.15 G
- model = simvit(
- embed_dims=[64, 128, 320, 512], num_heads=[1, 2, 5, 8], mlp_ratios=[4, 4, 4, 4], qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6), depths=[3, 8, 40, 3], **kwargs)
- model.default_cfg = _cfg()
-
- return model
-
-
- @register_model
- def simvit_huge(pretrained=False, **kwargs): # 90.73M 18.17 G
- model = simvit(
- embed_dims=[64, 128, 320, 512], num_heads=[1, 2, 5, 8], mlp_ratios=[4, 4, 4, 4], qkv_bias=True,
- norm_layer=partial(nn.LayerNorm, eps=1e-6), depths=[3, 12, 62, 3], **kwargs)
- model.default_cfg = _cfg()
-
- return model
-
-
- from einops import rearrange
- from torch.nn import *
- from mmcv.cnn import build_activation_layer, build_norm_layer
- from timm.models.layers import DropPath
- from einops.layers.torch import Rearrange
- import numpy as np
- import torch
- from torch.nn import Module, ModuleList, Upsample
- from mmcv.cnn import ConvModule
- from torch.nn import Sequential, Conv2d, UpsamplingBilinear2d
- import torch.nn as nn
-
-
- def resize(input,
- size=None,
- scale_factor=None,
- mode='nearest',
- align_corners=None,
- warning=True):
- if warning:
- if size is not None and align_corners:
- input_h, input_w = tuple(int(x) for x in input.shape[2:])
- output_h, output_w = tuple(int(x) for x in size)
- if output_h > input_h or output_w > output_h:
- if ((output_h > 1 and output_w > 1 and input_h > 1
- and input_w > 1) and (output_h - 1) % (input_h - 1)
- and (output_w - 1) % (input_w - 1)):
- warnings.warn(
- f'When align_corners={align_corners}, '
- 'the output would more aligned if '
- f'input size {(input_h, input_w)} is `x+1` and '
- f'out size {(output_h, output_w)} is `nx+1`')
- return F.interpolate(input, size, scale_factor, mode, align_corners)
-
-
- class MLP(nn.Module):
- """
- Linear Embedding
- """
-
- def __init__(self, input_dim=512, embed_dim=768):
- super().__init__()
- self.proj = nn.Linear(input_dim, embed_dim)
-
- def forward(self, x):
- x = x.flatten(2).transpose(1, 2)
- x = self.proj(x)
- return x
-
-
- class conv(nn.Module):
- """
- Linear Embedding
- """
-
- def __init__(self, input_dim=512, embed_dim=768):
- super().__init__()
-
- self.proj = nn.Sequential(nn.Conv2d(input_dim, embed_dim, 3, padding=1, bias=False),
- build_norm_layer(dict(type='BN', requires_grad=True), embed_dim)[1], nn.ReLU(),
- nn.Conv2d(embed_dim, embed_dim, 3, padding=1, bias=False),
- build_norm_layer(dict(type='BN', requires_grad=True), embed_dim)[1], nn.ReLU())
-
- def forward(self, x):
- x = self.proj(x)
- x = x.flatten(2).transpose(1, 2)
- return x
-
-
- from mmcv.cnn import build_norm_layer
-
-
- class Decoder(Module):
- """
- SegFormer: Simple and Efficient Design for Semantic Segmentation with Transformers
- """
-
- def __init__(self, dims, dim, class_num=2):
- super(Decoder, self).__init__()
- self.num_classes = class_num
-
- c1_in_channels, c2_in_channels, c3_in_channels, c4_in_channels = dims[0], dims[1], dims[2], dims[3]
- embedding_dim = dim
- self.norm_cfg = dict(type='BN', requires_grad=True)
-
- # self.linear_c4 = conv(input_dim=c4_in_channels, embed_dim=embedding_dim)
- # self.linear_c3 = conv(input_dim=c3_in_channels, embed_dim=embedding_dim)
- # self.linear_c2 = conv(input_dim=c2_in_channels, embed_dim=embedding_dim)
- # self.linear_c1 = conv(input_dim=c1_in_channels, embed_dim=embedding_dim)
-
- self.conv_0 = nn.Conv2d(c4_in_channels, 256, kernel_size=3, stride=1, padding=1)
- self.conv_1 = nn.Conv2d(256, 256, kernel_size=3, stride=1, padding=1)
- self.conv_2 = nn.Conv2d(256, 256, kernel_size=3, stride=1, padding=1)
- self.conv_3 = nn.Conv2d(256, 256, kernel_size=3, stride=1, padding=1)
- self.conv_4 = nn.Conv2d(256, self.num_classes, kernel_size=1, stride=1)
- _, self.syncbn_fc_0 = build_norm_layer(self.norm_cfg, 256)
- _, self.syncbn_fc_1 = build_norm_layer(self.norm_cfg, 256)
- _, self.syncbn_fc_2 = build_norm_layer(self.norm_cfg, 256)
- _, self.syncbn_fc_3 = build_norm_layer(self.norm_cfg, 256)
- self.align_corners = False
-
- self.linear_pred = nn.Conv2d(4 * embedding_dim, self.num_classes, 3, padding=1)
- self.dropout = nn.Dropout(0.1)
- 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)
- elif isinstance(m, nn.Conv2d):
- fan_out = m.kernel_size[0] * m.kernel_size[1] * m.out_channels
- fan_out //= m.groups
- m.weight.data.normal_(0, math.sqrt(2.0 / fan_out))
- if m.bias is not None:
- m.bias.data.zero_()
-
- def forward(self, inputs):
-
- c1, c2, c3, c4 = inputs
- ############## MLP decoder on C1-C4 ###########
- n, _, h, w = c4.shape
-
- x = self.conv_0(c4)
- x = self.syncbn_fc_0(x)
- x = F.relu(x, inplace=True)
- x = F.interpolate(x, size=x.shape[-1] * 2, mode='bilinear', align_corners=self.align_corners)
- x = self.conv_1(x)
- x = self.syncbn_fc_1(x)
- x = F.relu(x, inplace=True)
- x = F.interpolate(x, size=x.shape[-1] * 2, mode='bilinear', align_corners=self.align_corners)
- x = self.conv_2(x)
- x = self.syncbn_fc_2(x)
- x = F.relu(x, inplace=True)
- x = F.interpolate(x, size=x.shape[-1] * 2, mode='bilinear', align_corners=self.align_corners)
- x = self.conv_3(x)
- x = self.syncbn_fc_3(x)
- x = F.relu(x, inplace=True)
- x = self.conv_4(x)
- x = F.interpolate(x, size=x.shape[-1] * 2, mode='bilinear', align_corners=self.align_corners)
-
- return x
-
-
- class simVit_pup(nn.Module):
- def __init__(self, class_num=2):
- super(simVit_pup, self).__init__()
- self.class_num = class_num
- self.backbone = simvit_tiny()
- self.decode_head = Decoder(dims=[64, 128, 320, 512], dim=256, class_num=class_num)
- self._init_weights() # load pretrain
-
- def forward(self, x):
- features = self.backbone(x)
- features = self.decode_head(features)
- features = F.interpolate(features, size=x.shape[2:], mode='bilinear', align_corners=False)
- return features
-
- def _init_weights(self):
- pretrained_dict = torch.load('/mnt/DATA-1/DATA-2/Feilong/scformer/models/simVit/simvit_small_checkpoint_224.pth')
- model_dict = self.backbone.state_dict()
- pretrained_dict = {k: v for k, v in pretrained_dict.items() if k in model_dict}
- model_dict.update(pretrained_dict)
- self.backbone.load_state_dict(model_dict)
- print("successfully loaded!!!!")
-
-
- from torchinfo import summary
-
- simVit_pup = simVit_pup(class_num=1)
- summary(simVit_pup, (1, 3, 512, 512))
- from thop import profile
- import torch
-
- input = torch.randn(1, 3, 352, 352).to('cuda')
- macs, params = profile(simVit_pup, inputs=(input,))
- print('macs:', macs / 1000000000)
- print('params:', params / 1000000)
-
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