pytorch 中nn.Dropout的使用說明

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看代碼吧~

Class USeDropout(nn.Module):
 
    def __init__(self): 
        super(DropoutFC, self).__init__() 
        self.fc = nn.Linear(100,20) 
        self.dropout = nn.Dropout(p=0.5)  
    def forward(self, input): 
        out = self.fc(input) 
        out = self.dropout(out) 
        return out 
Net = USeDropout() 
Net.train()

示例代碼如上，直接調用nn.Dropout即可，但是註意在調用時要將模型參數傳入。

補充：Pytorch的nn.Dropout運行穩定性測試

結論：

Pytorch的nn.Dropout在每次被調用時dropout掉的參數都不一樣，即使是同一次forward也不同。

如果模型裡多次使用的dropout的dropout rate大小相同，用同一個dropout層即可。

如代碼所示：

import torch
import torch.nn as nn
class MyModel(nn.Module):
    def __init__(self):
        super(MyModel, self).__init__()
        self.dropout_1 = nn.Dropout(0.5)
        self.dropout_2 = nn.Dropout(0.5)
    def forward(self, input):
        # print(input)
        drop_1 = self.dropout_1(input)
        print(drop_1)
        drop_1 = self.dropout_1(input)
        print(drop_1)
        drop_2 = self.dropout_2(input)
        print(drop_2)
if __name__ == '__main__':
    i = torch.rand((5, 5))
    m = MyModel()
    m.forward(i)

結果如下：

*\python.exe */model.py
tensor([[0.0000, 0.0914, 0.0000, 1.4095, 0.0000],
[0.0000, 0.0000, 0.1726, 1.3800, 0.0000],
[1.7651, 0.0000, 0.0000, 0.9421, 1.5603],
[1.0510, 1.7290, 0.0000, 0.0000, 0.8565],
[0.0000, 0.0000, 0.0000, 0.0000, 0.0000]])
tensor([[0.0000, 0.0000, 0.4722, 1.4095, 0.0000],
[0.0416, 0.0000, 0.1726, 1.3800, 1.3193],
[0.0000, 0.3401, 0.6550, 0.0000, 0.0000],
[1.0510, 1.7290, 1.5515, 0.0000, 0.0000],
[0.6388, 0.0000, 0.0000, 1.0122, 0.0000]])
tensor([[0.0000, 0.0000, 0.4722, 0.0000, 1.2689],
[0.0416, 0.0000, 0.0000, 1.3800, 0.0000],
[0.0000, 0.0000, 0.6550, 0.0000, 1.5603],
[0.0000, 0.0000, 1.5515, 1.4596, 0.0000],
[0.0000, 0.0000, 0.0000, 0.0000, 0.0000]])

Process finished with exit code 0

以上為個人經驗，希望能給大傢一個參考，也希望大傢多多支持WalkonNet。

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