解决IndexError: invalid index of a 0-dim tensor. Use tensor.item() to convert a 0-dim tensor to a Pyth

灰太狼 2022-12-31 12:21 135阅读 0赞

### 解决IndexError: invalid index of a 0-dim tensor. Use tensor.item() to convert a 0-dim tensor to a Python number ###

#### 报错代码 ####

running_loss += loss.data[0] * inputs.size(0)

#### 报错信息 ####

IndexError                                Traceback (most recent call last)
    <ipython-input-8-7f128a52c8c7> in <module>
         19 # Decay LR by a factor of 0.1 every 7 epochs
         20 exp_lr_scheduler = lr_scheduler.StepLR(optimizer_ft, step_size=7, gamma=0.1)
    ---> 21 model_ft = train_model(model_ft, criterion, optimizer_ft, exp_lr_scheduler, num_epochs=1)
         22 
         23 visualize_model(model_ft)
    
    <ipython-input-6-e165c8ed70ce> in train_model(model, criterion, optimizer, scheduler, num_epochs)
         57 
         58                 # statistics
    ---> 59                 running_loss += loss.data[0] * inputs.size(0)
         60                 running_corrects += torch.sum(preds == labels.data)
         61 
    
    IndexError: invalid index of a 0-dim tensor. Use tensor.item() to convert a 0-dim tensor to a Python number

#### 解决办法 ####

running_loss += loss.item() * inputs.size(0)

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