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Implementing the training step

In this exercise, you'll implement the training_step() method in a PyTorch Lightning module designed for an image classification task. Your implementation should unpack a batch of images and labels, compute the model predictions via the forward pass, calculate the cross entropy loss, and log the training loss.

Latihan ini adalah bagian dari kursus

Scalable AI Models with PyTorch Lightning

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Petunjuk latihan

  • Ensure that you compute predictions using the forward pass.
  • Calculate the cross entropy loss.
  • Log the training loss.

Latihan interaktif praktis

Cobalah latihan ini dengan menyelesaikan kode contoh berikut.

from torch.nn.functional import cross_entropy

def training_step(self, batch, batch_idx):
    x, y = batch
    # Ensure that you compute predictions using the forward pass
    y_hat = ____
    # Calculate the cross entropy loss
    loss = ____
    # Log the loss
    self.____("train_loss", loss)
    return loss
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