def test_forward_path(
lstm_model: LSTMModel,
batch_prev_tkids: torch.Tensor,
):
r"""Parameters used during forward must have gradients."""
# Make sure model has no gradients.
lstm_model = lstm_model.train()
lstm_model.zero_grad()
lstm_model(batch_prev_tkids).sum().backward()
assert hasattr(lstm_model.emb.weight.grad, 'grad')
assert hasattr(lstm_model.pre_hid[0].weight.grad, 'grad')
assert hasattr(lstm_model.hid.weight_ih_l0.grad, 'grad')
assert hasattr(lstm_model.post_hid[-1].weight.grad, 'grad')
def test_back_propagation_path(
lstm_model: LSTMModel,
batch_prev_tkids: torch.Tensor,
batch_next_tkids: torch.Tensor,
):
r"""Gradients with respect to loss must get back propagated."""
# Make sure model has no gradients.
lstm_model = lstm_model.train()
lstm_model.zero_grad()
lstm_model.loss_fn(
batch_prev_tkids=batch_prev_tkids,
batch_next_tkids=batch_next_tkids,
).backward()
assert hasattr(lstm_model.emb.weight.grad, 'grad')
assert hasattr(lstm_model.pre_hid[0].weight.grad, 'grad')
assert hasattr(lstm_model.hid.weight_ih_l0.grad, 'grad')
assert hasattr(lstm_model.post_hid[-1].weight.grad, 'grad')
