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今天小編給大家分享一下怎么將yolov5中的PANet層改為BiFPN的相關知識點,內容詳細,邏輯清晰,相信大部分人都還太了解這方面的知識,所以分享這篇文章給大家參考一下,希望大家閱讀完這篇文章后有所收獲,下面我們一起來了解一下吧。
1.在common.py后加入如下代碼
# 結合BiFPN 設置可學習參數 學習不同分支的權重 # 兩個分支add操作 class BiFPN_Add2(nn.Module): def __init__(self, c1, c2): super(BiFPN_Add2, self).__init__() # 設置可學習參數 nn.Parameter的作用是:將一個不可訓練的類型Tensor轉換成可以訓練的類型parameter # 并且會向宿主模型注冊該參數 成為其一部分 即model.parameters()會包含這個parameter # 從而在參數優化的時候可以自動一起優化 self.w = nn.Parameter(torch.ones(2, dtype=torch.float32), requires_grad=True) self.epsilon = 0.0001 self.conv = nn.Conv2d(c1, c2, kernel_size=1, stride=1, padding=0) self.silu = nn.SiLU() def forward(self, x): w = self.w weight = w / (torch.sum(w, dim=0) + self.epsilon) return self.conv(self.silu(weight[0] * x[0] + weight[1] * x[1])) # 三個分支add操作 class BiFPN_Add3(nn.Module): def __init__(self, c1, c2): super(BiFPN_Add3, self).__init__() self.w = nn.Parameter(torch.ones(3, dtype=torch.float32), requires_grad=True) self.epsilon = 0.0001 self.conv = nn.Conv2d(c1, c2, kernel_size=1, stride=1, padding=0) self.silu = nn.SiLU() def forward(self, x): w = self.w weight = w / (torch.sum(w, dim=0) + self.epsilon) # 將權重進行歸一化 # Fast normalized fusion return self.conv(self.silu(weight[0] * x[0] + weight[1] * x[1] + weight[2] * x[2]))
2.yolov5s.yaml進行修改
# YOLOv5 ???? by Ultralytics, GPL-3.0 license # Parameters nc: 80 # number of classes depth_multiple: 0.33 # model depth multiple width_multiple: 0.50 # layer channel multiple anchors: - [10,13, 16,30, 33,23] # P3/8 - [30,61, 62,45, 59,119] # P4/16 - [116,90, 156,198, 373,326] # P5/32 # YOLOv5 v6.0 backbone backbone: # [from, number, module, args] [[-1, 1, Conv, [64, 6, 2, 2]], # 0-P1/2 [-1, 1, Conv, [128, 3, 2]], # 1-P2/4 [-1, 3, C3, [128]], [-1, 1, Conv, [256, 3, 2]], # 3-P3/8 [-1, 6, C3, [256]], [-1, 1, Conv, [512, 3, 2]], # 5-P4/16 [-1, 9, C3, [512]], [-1, 1, Conv, [1024, 3, 2]], # 7-P5/32 [-1, 3, C3, [1024]], [-1, 1, SPPF, [1024, 5]], # 9 ] # YOLOv5 v6.0 BiFPN head head: [[-1, 1, Conv, [512, 1, 1]], [-1, 1, nn.Upsample, [None, 2, 'nearest']], [[-1, 6], 1, BiFPN_Add2, [256, 256]], # cat backbone P4 [-1, 3, C3, [512, False]], # 13 [-1, 1, Conv, [256, 1, 1]], [-1, 1, nn.Upsample, [None, 2, 'nearest']], [[-1, 4], 1, BiFPN_Add2, [128, 128]], # cat backbone P3 [-1, 3, C3, [256, False]], # 17 (P3/8-small) [-1, 1, Conv, [512, 3, 2]], # 為了BiFPN正確add,調整channel數 [[-1, 13, 6], 1, BiFPN_Add3, [256, 256]], # cat P4 <--- BiFPN change 注意v5s通道數是默認參數的一半 [-1, 3, C3, [512, False]], # 20 (P4/16-medium) [-1, 1, Conv, [512, 3, 2]], [[-1, 10], 1, BiFPN_Add2, [256, 256]], # cat head P5 [-1, 3, C3, [1024, False]], # 23 (P5/32-large) [[17, 20, 23], 1, Detect, [nc, anchors]], # Detect(P3, P4, P5) ]
3.修改yolo.py,在parse_model
函數中找到elif m is Concat:
語句,在其后面加上BiFPN_Add
相關語句:
# 添加bifpn_add結構 elif m in [BiFPN_Add2, BiFPN_Add3]: c2 = max([ch[x] for x in f])
4.修改train.py,向優化器中添加BiFPN的權重參數
將BiFPN_Add2
和BiFPN_Add3
函數中定義的w
參數,加入g1
# BiFPN_Concat elif isinstance(v, BiFPN_Add2) and hasattr(v, 'w') and isinstance(v.w, nn.Parameter): g1.append(v.w) elif isinstance(v, BiFPN_Add3) and hasattr(v, 'w') and isinstance(v.w, nn.Parameter): g1.append(v.w)
然后導入一下這兩個包
1.在common.py后加入如下代碼
# 結合BiFPN 設置可學習參數 學習不同分支的權重 # 兩個分支concat操作 class BiFPN_Concat2(nn.Module): def __init__(self, dimension=1): super(BiFPN_Concat2, self).__init__() self.d = dimension self.w = nn.Parameter(torch.ones(2, dtype=torch.float32), requires_grad=True) self.epsilon = 0.0001 def forward(self, x): w = self.w weight = w / (torch.sum(w, dim=0) + self.epsilon) # 將權重進行歸一化 # Fast normalized fusion x = [weight[0] * x[0], weight[1] * x[1]] return torch.cat(x, self.d) # 三個分支concat操作 class BiFPN_Concat3(nn.Module): def __init__(self, dimension=1): super(BiFPN_Concat3, self).__init__() self.d = dimension # 設置可學習參數 nn.Parameter的作用是:將一個不可訓練的類型Tensor轉換成可以訓練的類型parameter # 并且會向宿主模型注冊該參數 成為其一部分 即model.parameters()會包含這個parameter # 從而在參數優化的時候可以自動一起優化 self.w = nn.Parameter(torch.ones(3, dtype=torch.float32), requires_grad=True) self.epsilon = 0.0001 def forward(self, x): w = self.w weight = w / (torch.sum(w, dim=0) + self.epsilon) # 將權重進行歸一化 # Fast normalized fusion x = [weight[0] * x[0], weight[1] * x[1], weight[2] * x[2]] return torch.cat(x, self.d)
2.yolov5s.yaml進行修改
# YOLOv5 ???? by Ultralytics, GPL-3.0 license # Parameters nc: 80 # number of classes depth_multiple: 0.33 # model depth multiple width_multiple: 0.50 # layer channel multiple anchors: - [10,13, 16,30, 33,23] # P3/8 - [30,61, 62,45, 59,119] # P4/16 - [116,90, 156,198, 373,326] # P5/32 # YOLOv5 v6.0 backbone backbone: # [from, number, module, args] [[-1, 1, Conv, [64, 6, 2, 2]], # 0-P1/2 [-1, 1, Conv, [128, 3, 2]], # 1-P2/4 [-1, 3, C3, [128]], [-1, 1, Conv, [256, 3, 2]], # 3-P3/8 [-1, 6, C3, [256]], [-1, 1, Conv, [512, 3, 2]], # 5-P4/16 [-1, 9, C3, [512]], [-1, 1, Conv, [1024, 3, 2]], # 7-P5/32 [-1, 3, C3, [1024]], [-1, 1, SPPF, [1024, 5]], # 9 ] # YOLOv5 v6.0 BiFPN head head: [[-1, 1, Conv, [512, 1, 1]], [-1, 1, nn.Upsample, [None, 2, 'nearest']], [[-1, 6], 1, BiFPN_Concat2, [1]], # cat backbone P4 <--- BiFPN change [-1, 3, C3, [512, False]], # 13 [-1, 1, Conv, [256, 1, 1]], [-1, 1, nn.Upsample, [None, 2, 'nearest']], [[-1, 4], 1, BiFPN_Concat2, [1]], # cat backbone P3 <--- BiFPN change [-1, 3, C3, [256, False]], # 17 (P3/8-small) [-1, 1, Conv, [256, 3, 2]], [[-1, 14, 6], 1, BiFPN_Concat3, [1]], # cat P4 <--- BiFPN change [-1, 3, C3, [512, False]], # 20 (P4/16-medium) [-1, 1, Conv, [512, 3, 2]], [[-1, 10], 1, BiFPN_Concat2, [1]], # cat head P5 <--- BiFPN change [-1, 3, C3, [1024, False]], # 23 (P5/32-large) [[17, 20, 23], 1, Detect, [nc, anchors]], # Detect(P3, P4, P5) ]
3.修改yolo.py,在parse_model
函數中找到elif m is Concat:
語句,在其后面加上BiFPN_
Concat相關語句:
# 添加bifpn_concat結構 elif m in [Concat, BiFPN_Concat2, BiFPN_Concat3]: c2 = sum(ch[x] for x in f)
4.修改train.py,向優化器中添加BiFPN的權重參數
添加復方式同上(Add)
# BiFPN_Concat elif isinstance(v, BiFPN_Concat2) and hasattr(v, 'w') and isinstance(v.w, nn.Parameter): g1.append(v.w) elif isinstance(v, BiFPN_Concat3) and hasattr(v, 'w') and isinstance(v.w, nn.Parameter): g1.append(v.w)
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