pytorch查看網絡參數顯存占用量等操作

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1.使用torchstat

pip install torchstat 

from torchstat import stat
import torchvision.models as models
model = models.resnet152()
stat(model, (3, 224, 224))

關於stat函數的參數，第一個應該是模型，第二個則是輸入尺寸，3為通道數。我沒有調研該函數的詳細參數，也不知道為什麼使用的時候並不提示相應的參數。

2.使用torchsummary

pip install torchsummary
 
from torchsummary import summary
summary(model.cuda(),input_size=(3,32,32),batch_size=-1)

使用該函數直接對參數進行提示，可以發現直接有顯式輸入batch_size的地方，我自己的感覺好像該函數更好一些。但是！！！不知道為什麼，該函數在我的機器上一直報錯！！！

TypeError: can’t convert CUDA tensor to numpy. Use Tensor.cpu() to copy the tensor to host memory first.

Update：經過論壇咨詢，報錯的原因找到瞭，隻需要把

pip install torchsummary

修改為

pip install torch-summary

補充：Pytorch查看模型參數並計算模型參數量與可訓練參數量

查看模型參數(以AlexNet為例）

import torch
import torch.nn as nn
import torchvision
class AlexNet(nn.Module):
    def __init__(self,num_classes=1000):
        super(AlexNet,self).__init__()
        self.feature_extraction = nn.Sequential(
            nn.Conv2d(in_channels=3,out_channels=96,kernel_size=11,stride=4,padding=2,bias=False),
            nn.ReLU(inplace=True),
            nn.MaxPool2d(kernel_size=3,stride=2,padding=0),
            nn.Conv2d(in_channels=96,out_channels=192,kernel_size=5,stride=1,padding=2,bias=False),
            nn.ReLU(inplace=True),
            nn.MaxPool2d(kernel_size=3,stride=2,padding=0),
            nn.Conv2d(in_channels=192,out_channels=384,kernel_size=3,stride=1,padding=1,bias=False),
            nn.ReLU(inplace=True),
            nn.Conv2d(in_channels=384,out_channels=256,kernel_size=3,stride=1,padding=1,bias=False),
            nn.ReLU(inplace=True),
            nn.Conv2d(in_channels=256,out_channels=256,kernel_size=3,stride=1,padding=1,bias=False),
            nn.ReLU(inplace=True),
            nn.MaxPool2d(kernel_size=3, stride=2, padding=0),
        )
        self.classifier = nn.Sequential(
            nn.Dropout(p=0.5),
            nn.Linear(in_features=256*6*6,out_features=4096),
            nn.ReLU(inplace=True),
            nn.Dropout(p=0.5),
            nn.Linear(in_features=4096, out_features=4096),
            nn.ReLU(inplace=True),
            nn.Linear(in_features=4096, out_features=num_classes),
        )
    def forward(self,x):
        x = self.feature_extraction(x)
        x = x.view(x.size(0),256*6*6)
        x = self.classifier(x)
        return x
if __name__ =='__main__':
    # model = torchvision.models.AlexNet()
    model = AlexNet()
    
    # 打印模型參數
    #for param in model.parameters():
        #print(param)
    
    #打印模型名稱與shape
    for name,parameters in model.named_parameters():
        print(name,':',parameters.size())

feature_extraction.0.weight : torch.Size([96, 3, 11, 11])
feature_extraction.3.weight : torch.Size([192, 96, 5, 5])
feature_extraction.6.weight : torch.Size([384, 192, 3, 3])
feature_extraction.8.weight : torch.Size([256, 384, 3, 3])
feature_extraction.10.weight : torch.Size([256, 256, 3, 3])
classifier.1.weight : torch.Size([4096, 9216])
classifier.1.bias : torch.Size([4096])
classifier.4.weight : torch.Size([4096, 4096])
classifier.4.bias : torch.Size([4096])
classifier.6.weight : torch.Size([1000, 4096])
classifier.6.bias : torch.Size([1000])

計算參數量與可訓練參數量

def get_parameter_number(model):
    total_num = sum(p.numel() for p in model.parameters())
    trainable_num = sum(p.numel() for p in model.parameters() if p.requires_grad)
    return {'Total': total_num, 'Trainable': trainable_num}

第三方工具

from torchstat import stat
import torchvision.models as models
model = models.alexnet()
stat(model, (3, 224, 224))

在這裡插入圖片描述 

from torchvision.models import alexnet
import torch
from thop import profile
model = alexnet()
input = torch.randn(1, 3, 224, 224)
flops, params = profile(model, inputs=(input, ))
print(flops, params)

在這裡插入圖片描述

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。如有錯誤或未考慮完全的地方，望不吝賜教。

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