Training doesn't converge when running on M1 pro GPU (MPS device)


I’m trying to train a network model on Macbook M1 pro GPU by using the MPS device, but for some reason the training doesn’t converge, and the final training loss is 10x higher on MPS than when training on CPU.

Does anyone have any idea on what could cause this?

def train():
    device = torch.device('mps')

    epoch_number = 0

    EPOCHS = 5

    best_vloss = 1_000_000.
    model = ESFuturesPricePredictorModel(maps_multiplier=1)

    dataset = ESFuturesDataset('data', ['5m'], [130], common_transform=[my_transform, torch_transform])

    # Create data loaders for our datasets; shuffle for training, not for validation
    training_loader =, batch_size=64*4, shuffle=True, num_workers=4)
    #validation_loader =, batch_size=4, shuffle=False, num_workers=2)

    loss_fn = torch.nn.MSELoss()

    # Report split sizes
    print('Training set has {} instances'.format(len(dataset)))

    optimizer = torch.optim.AdamW(model.parameters(), lr=0.0001, betas=(0.9, 0.95))

    def train_one_epoch(epoch_index):
        running_loss = 0.
        last_loss = 0.

        for i, data in enumerate(training_loader):
            inputs, labels = data

            for k in inputs.keys():
                inputs[k] = inputs[k].to(device)
            for k in labels.keys():
                labels[k] = labels[k].to(device)


            outputs = model(inputs)

            loss = loss_fn(outputs, labels['5m'])

            # Adjust learning weights

            # Gather data and report
            running_loss += loss.item()
            if i % 100 == 99:
                last_loss = running_loss / 100 # loss per batch
                print('  batch {} loss: {}'.format(i + 1, last_loss))
                running_loss = 0.

        return last_loss

    for epoch in range(EPOCHS):
        print('EPOCH {}:'.format(epoch_number + 1))

        avg_loss = train_one_epoch(epoch_number)

        print('LOSS train {}'.format(avg_loss))

        epoch_number += 1

I have experienced similar things training with MPS. My networks converge using CPU but not when using the MPS device. This is with multiple different versions, most recently:
pytorch 1.13.0.dev20220929 py3.9_0 pytorch-nightly

Same happened to me. On my desktop using Cuda, same training converge but on M1 laptop, it didnt converge. I will try to troubleshoot If I can and share here.

Hi @jenkin. Thank you for reporting this issue.

@jenkin, Jackson, @utkuaslan85 - could you please provide a small sample code that reproduces the issue? For visibility, it would also be good to create an issue on GitHub - pytorch/pytorch: Tensors and Dynamic neural networks in Python with strong GPU acceleration with the sample code and torch version used. Thanks!

Any solution to this problem yet ? It hasn’t been funny for me for more than 24 hours now. Same model I trained a week ago is no longer converging on M1 GPU but works on CPU.

Updates : updating to pytorch “1.13.1” solves my problem.