I have the code to evaluate the model 
def evaluate_model(model, test_loader, criterion, best_model_name):
model.load_state_dict(torch.load(best_model_name))
# Specify the heartbeat classes from above
classes = {
    0: 'N - Normal Beat', 
    1: 'S - Supraventricular premature or ectopic beat',
    2: 'V - Premature ventricular contraction', 
    3: 'F - Fusion of ventricular and normal beat', 
    4: 'Q - Unclassified beat'}

# track test loss
test_loss = 0.0
class_correct = list(0. for i in range(5))
class_total = list(0. for i in range(5))

model.eval()
# iterate over test data
for data, target in test_loader:
    # move tensors to GPU if CUDA is available
    if train_on_gpu:
        data, target = data.cuda(), target.cuda()
    # forward pass: compute predicted outputs by passing inputs to the model
    #print(data.float())
    output = model(data.float())
    # calculate the batch loss
    loss = criterion(output, target.long())
    # update test loss 
    test_loss += loss.item()*data.size(0)
    # convert output probabilities to predicted class
    _, pred = torch.max(output, 1)
    # compare predictions to true label
    correct_tensor = pred.eq(target.data.view_as(pred))
    correct = np.squeeze(correct_tensor.numpy()) if not train_on_gpu else np.squeeze(correct_tensor.cpu().numpy())
    # calculate test accuracy for each object class
    for i in range(batch_size):
        label = target.data[i].int()
        class_correct[label] += correct[i].item()
        class_total[label] += 1

# average test loss
test_loss = test_loss/len(test_loader.dataset)
print('Test Loss: {:.6f}\n'.format(test_loss))

for i in range(5):
    if class_total[i] > 0:
        print('Test Accuracy of %5s: %2d%% (%2d/%2d)' % (
            classes[i], 100 * class_correct[i] / class_total[i],
            np.sum(class_correct[i]), np.sum(class_total[i])))
    else:
        print('Test Accuracy of %5s: N/A (no training examples)' % (classes[i]))

print('\nTest Accuracy (Overall): %2d%% (%2d/%2d)' % (
    100. * np.sum(class_correct) / np.sum(class_total),
    np.sum(class_correct), np.sum(class_total)))


When I run 
evaluate_model(model_1, test_loader_1, criterion, ‘model_ecg_heartbeat_categorization_1.pt’)
I get the output as:

image793×237 28.5 KB

criterion is NLLLoss and batch size is 32
How do I correct it ??Pls help !!