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PYTORCHLAB 9-3
model.train()    # set the model to train mode (dropout=True)
for epoch in range(training_epochs):
    avg_cost = 0

    for X, Y in data_loader:
        # reshape input image into [batch_size by 784]
        # label is not one-hot encoded
        X = X.view(-1, 28 * 28).to(device)
        Y = Y.to(device)

        optimizer.zero_grad()
        hypothesis = model(X)
        cost = criterion(hypothesis, Y)
        cost.backward()
        optimizer.step()

        avg_cost += cost / total_batch

    print('Epoch:', '%04d' % (epoch + 1), 'cost =', '{:.9f}'.format(avg_cost))

print('Learning finished')

'''output
Epoch: 0001 cost = 0.308392197
Epoch: 0002 cost = 0.142623395
Epoch: 0003 cost = 0.113427199
Epoch: 0004 cost = 0.093490042
Epoch: 0005 cost = 0.083772294
Epoch: 0006 cost = 0.077040948
Epoch: 0007 cost = 0.067025252
Epoch: 0008 cost = 0.063156039
Epoch: 0009 cost = 0.058766391
Epoch: 0010 cost = 0.055902217
Epoch: 0011 cost = 0.052059878
Epoch: 0012 cost = 0.048243146
Epoch: 0013 cost = 0.047231019
Epoch: 0014 cost = 0.045120358
Epoch: 0015 cost = 0.040942233
Learning finished
'''

Dropout

lab7-1에서 알아본 것처럼 학습을 하다보면 train set에 너무 과적합(overfitting)되는 경우가 발생한다.

2022.05.14·7분·dropout