Pytorch 实现计算分类器准确率(总分类及子分类)

分类器平均准确率计算：

correct = torch.zeros(1).squeeze().cuda()
total = torch.zeros(1).squeeze().cuda()
for i, (images, labels) in enumerate(train_loader):
      images = variable(images.cuda())
      labels = variable(labels.cuda())

      output = model(images)

      prediction = torch.argmax(output, 1)
      correct += (prediction == labels).sum().float()
      total += len(labels)
acc_str = 'accuracy: %f'%((correct/total).cpu().detach().data.numpy())

分类器各个子类准确率计算：

correct = list(0. for i in range(args.class_num))
total = list(0. for i in range(args.class_num))
for i, (images, labels) in enumerate(train_loader):
      images = variable(images.cuda())
      labels = variable(labels.cuda())

      output = model(images)

      prediction = torch.argmax(output, 1)
      res = prediction == labels
      for label_idx in range(len(labels)):
        label_single = label[label_idx]
        correct[label_single] += res[label_idx].item()
        total[label_single] += 1
 acc_str = 'accuracy: %f'%(sum(correct)/sum(total))
 for acc_idx in range(len(train_class_correct)):
      try:
        acc = correct[acc_idx]/total[acc_idx]
      except:
        acc = 0
      finally:
        acc_str += '\tclassid:%d\tacc:%f\t'%(acc_idx+1, acc)

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