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https://github.com/ml-explore/mlx-examples.git
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112 lines
3.5 KiB
Python
112 lines
3.5 KiB
Python
import argparse
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import time
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import resnet
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import mlx.nn as nn
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import mlx.core as mx
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import mlx.optimizers as optim
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from dataset import get_cifar10
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parser = argparse.ArgumentParser(add_help=True)
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parser.add_argument(
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"--arch",
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type=str,
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default="resnet20",
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help="model architecture [resnet20, resnet32, resnet44, resnet56, resnet110, resnet1202]",
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)
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parser.add_argument("--batch_size", type=int, default=256, help="batch size")
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parser.add_argument("--epochs", type=int, default=100, help="number of epochs")
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parser.add_argument("--lr", type=float, default=1e-3, help="learning rate")
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parser.add_argument("--seed", type=int, default=0, help="random seed")
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parser.add_argument("--cpu", action="store_true", help="use cpu only")
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def loss_fn(model, inp, tgt):
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return mx.mean(nn.losses.cross_entropy(model(inp), tgt))
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def eval_fn(model, inp, tgt):
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return mx.mean(mx.argmax(model(inp), axis=1) == tgt)
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def train_epoch(model, train_iter, optimizer, epoch):
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def train_step(model, inp, tgt):
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output = model(inp)
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loss = mx.mean(nn.losses.cross_entropy(output, tgt))
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acc = mx.mean(mx.argmax(output, axis=1) == tgt)
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return loss, acc
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train_step_fn = nn.value_and_grad(model, train_step)
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losses = []
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accs = []
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samples_per_sec = []
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for batch_counter, batch in enumerate(train_iter):
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x = mx.array(batch["image"])
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y = mx.array(batch["label"])
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tic = time.perf_counter()
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(loss, acc), grads = train_step_fn(model, x, y)
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optimizer.update(model, grads)
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mx.eval(model.parameters(), optimizer.state)
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toc = time.perf_counter()
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loss_value = loss.item()
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acc_value = acc.item()
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losses.append(loss_value)
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accs.append(acc_value)
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samples_per_sec.append(x.shape[0] / (toc - tic))
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if batch_counter % 10 == 0:
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print(
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f"Epoch {epoch:02d} [{batch_counter:03d}] | tr_loss {loss_value:.3f} | tr_acc {acc_value:.3f} | Throughput: {x.shape[0] / (toc - tic):.2f} images/second"
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)
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mean_tr_loss = mx.mean(mx.array(losses))
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mean_tr_acc = mx.mean(mx.array(accs))
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samples_per_sec = mx.mean(mx.array(samples_per_sec))
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return mean_tr_loss, mean_tr_acc, samples_per_sec
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def test_epoch(model, test_iter, epoch):
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accs = []
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for batch_counter, batch in enumerate(test_iter):
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x = mx.array(batch["image"])
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y = mx.array(batch["label"])
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acc = eval_fn(model, x, y)
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acc_value = acc.item()
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accs.append(acc_value)
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mean_acc = mx.mean(mx.array(accs))
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return mean_acc
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def main(args):
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mx.random.seed(args.seed)
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model = resnet.__dict__[args.arch]()
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print("num_params: {:0.04f} M".format(model.num_params() / 1e6))
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mx.eval(model.parameters())
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optimizer = optim.Adam(learning_rate=args.lr)
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train_data, test_data = get_cifar10(args.batch_size)
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for epoch in range(args.epochs):
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epoch_tr_loss, epoch_tr_acc, train_throughput = train_epoch(
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model, train_data, optimizer, epoch
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)
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print(
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f"Epoch: {epoch} | avg. tr_loss {epoch_tr_loss.item():.3f} | avg. tr_acc {epoch_tr_acc.item():.3f} | Train Throughput: {train_throughput.item():.2f} images/sec"
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)
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epoch_test_acc = test_epoch(model, test_data, epoch)
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print(f"Epoch: {epoch} | test_acc {epoch_test_acc.item():.3f}")
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train_data.reset()
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test_data.reset()
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if __name__ == "__main__":
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args = parser.parse_args()
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if args.cpu:
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mx.set_default_device(mx.cpu)
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main(args)
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