Pytorch 实现计算分类器准确率(总分类及子分类)

Python  /  管理员 发布于 5年前   595

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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