def train(epochs=50_000):
tensorboard_log_folder = f"runs/copy-task-{datetime.now().strftime('%Y-%m-%dT%H%M%S')}"
writer = SummaryWriter(tensorboard_log_folder)
print(f"Training for {epochs} epochs, logging in {tensorboard_log_folder}")
sequence_min_length = 1
sequence_max_length = 20
vector_length = 8
memory_size = (128, 20)
hidden_layer_size = 100
batch_size = 4
lstm_controller = not args.ff
writer.add_scalar("sequence_min_length", sequence_min_length)
writer.add_scalar("sequence_max_length", sequence_max_length)
writer.add_scalar("vector_length", vector_length)
writer.add_scalar("memory_size0", memory_size[0])
writer.add_scalar("memory_size1", memory_size[1])
writer.add_scalar("hidden_layer_size", hidden_layer_size)
writer.add_scalar("lstm_controller", lstm_controller)
writer.add_scalar("seed", seed)
writer.add_scalar("batch_size", batch_size)
model = NTM(vector_length, hidden_layer_size, memory_size, lstm_controller)
optimizer = optim.RMSprop(model.parameters(),
momentum=0.9,
alpha=0.95,
lr=1e-4)
feedback_frequency = 100
total_loss = []
total_cost = []
os.makedirs("models", exist_ok=True)
if os.path.isfile(model_path):
print(f"Loading model from {model_path}")
checkpoint = torch.load(model_path, map_location=torch.device('cpu'))
model.load_state_dict(checkpoint)
for epoch in range(epochs + 1):
optimizer.zero_grad()
input, target = get_training_sequence(sequence_min_length,
sequence_max_length,
vector_length, batch_size)
state = model.get_initial_state(batch_size)
for vector in input:
_, state = model(vector, state)
y_out = torch.zeros(target.size())
for j in range(len(target)):
y_out[j], state = model(torch.zeros(batch_size, vector_length + 1),
state)
loss = F.binary_cross_entropy(y_out, target)
loss.backward()
optimizer.step()
total_loss.append(loss.item())
y_out_binarized = y_out.clone().data
y_out_binarized.apply_(lambda x: 0 if x < 0.5 else 1)
cost = torch.sum(torch.abs(y_out_binarized - target)) / len(target)
total_cost.append(cost.item())
if epoch % feedback_frequency == 0:
running_loss = sum(total_loss) / len(total_loss)
running_cost = sum(total_cost) / len(total_cost)
print(f"Loss at step {epoch}: {running_loss}")
writer.add_scalar('training loss', running_loss, epoch)
writer.add_scalar('training cost', running_cost, epoch)
total_loss = []
total_cost = []
torch.save(model.state_dict(), model_path)