mnist_mlp.py 文件源码

def main():
    unit = 1000
    batchsize = 100
    epoch = 20

    model = L.Classifier(MLP(unit, 10))

    optimizer = chainer.optimizers.Adam()
    optimizer.setup(model)

    train, test = chainer.datasets.get_mnist()
    train_iter = chainer.iterators.SerialIterator(train, batchsize)
    test_iter = chainer.iterators.SerialIterator(test, batchsize, repeat=False, shuffle=False)

    updater = training.StandardUpdater(train_iter, optimizer)
    trainer = training.Trainer(updater, (epoch, 'epoch'), out='result')

    trainer.extend(extensions.Evaluator(test_iter, model))
    trainer.extend(extensions.dump_graph('main/loss'))
    trainer.extend(extensions.snapshot(), trigger=(epoch, 'epoch'))
    trainer.extend(extensions.LogReport())
    trainer.extend(extensions.PrintReport(
        ['epoch', 'main/loss', 'validation/main/loss',
         'main/accuracy', 'validation/main/accuracy', 'elapsed_time']))
    trainer.extend(extensions.ProgressBar())

    trainer.run()