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+import mindspore
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+import mindspore.nn as nn
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+from mindspore.dataset import vision, Cifar10Dataset
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+from mindspore.dataset.vision import transforms
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+
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+from tests.model.AlexNet import AlexNet
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+
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+train_dataset = Cifar10Dataset(dataset_dir='data/cifar-10-batches-bin', usage='train', shuffle=True)
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+test_dataset = Cifar10Dataset(dataset_dir='data/cifar-10-batches-bin', usage='test')
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+batch_size = 32
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+
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+def datapipe(dataset, batch_size):
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+ image_transforms = [
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+ vision.Rescale(1.0 / 255.0, 0),
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+ vision.Normalize(mean=(0.1307,), std=(0.3081,)),
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+ vision.HWC2CHW()
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+ ]
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+ label_transform = transforms.TypeCast(mindspore.int32)
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+
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+ dataset = dataset.map(image_transforms, 'image')
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+ dataset = dataset.map(label_transform, 'label')
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+ dataset = dataset.batch(batch_size)
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+ return dataset
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+
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+# Map vision transforms and batch dataset
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+train_dataset = datapipe(train_dataset, batch_size)
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+test_dataset = datapipe(test_dataset, batch_size)
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+
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+
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+# Define model
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+model = AlexNet(input_channels=3, output_num=10, input_size=32)
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+print(model)
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+
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+# Instantiate loss function and optimizer
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+loss_fn = nn.CrossEntropyLoss()
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+optimizer = nn.Adam(model.trainable_params(), 1e-2)
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+
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+# 1. Define forward function
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+def forward_fn(data, label):
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+ logits = model(data)
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+ loss = loss_fn(logits, label)
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+ return loss, logits
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+
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+# 2. Get gradient function
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+grad_fn = mindspore.value_and_grad(forward_fn, None, optimizer.parameters, has_aux=True)
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+
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+# 3. Define function of one-step training
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+def train_step(data, label):
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+ (loss, _), grads = grad_fn(data, label)
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+ optimizer(grads)
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+ return loss
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+
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+def train(model, dataset):
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+ size = dataset.get_dataset_size()
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+ model.set_train()
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+ for batch, (data, label) in enumerate(dataset.create_tuple_iterator()):
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+ loss = train_step(data, label)
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+
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+ if batch % 100 == 0:
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+ loss, current = loss.asnumpy(), batch
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+ print(f"loss: {loss:>7f} [{current:>3d}/{size:>3d}]")
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+
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+def test(model, dataset, loss_fn):
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+ num_batches = dataset.get_dataset_size()
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+ model.set_train(False)
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+ total, test_loss, correct = 0, 0, 0
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+ for data, label in dataset.create_tuple_iterator():
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+ pred = model(data)
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+ total += len(data)
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+ test_loss += loss_fn(pred, label).asnumpy()
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+ correct += (pred.argmax(1) == label).asnumpy().sum()
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+ test_loss /= num_batches
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+ correct /= total
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+ print(f"Test: \n Accuracy: {(100*correct):>0.1f}%, Avg loss: {test_loss:>8f} \n")
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+
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+
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+if __name__ == '__main__':
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+ epochs = 10
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+ mindspore.set_context(device_target="GPU")
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+ for t in range(epochs):
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+ print(f"Epoch {t + 1}\n-------------------------------")
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+ train(model, train_dataset)
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+ test(model, test_dataset, loss_fn)
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+ print("Done!")
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