sample.py 文件源码

def main(gpu_id=-1, bs=32, epoch=20, out='./result', resume=''):
    net = ShallowConv()
    model = L.Classifier(net)
    if gpu_id >= 0:
        chainer.cuda.get_device_from_id(gpu_id)
        model.to_gpu()
    optimizer = chainer.optimizers.Adam()
    optimizer.setup(model)

    train, test = chainer.datasets.get_mnist(ndim=3)
    train_iter = chainer.iterators.SerialIterator(train, bs)
    test_iter = chainer.iterators.SerialIterator(
        test, bs, repeat=False, shuffle=False)

    updater = training.StandardUpdater(train_iter, optimizer, device=gpu_id)
    trainer = training.Trainer(updater, (epoch, 'epoch'), out=out)
    trainer.extend(extensions.ParameterStatistics(model.predictor))
    trainer.extend(extensions.Evaluator(test_iter, model, device=gpu_id))
    trainer.extend(extensions.LogReport(log_name='parameter_statistics'))
    trainer.extend(extensions.PrintReport(
        ['epoch', 'main/loss', 'validation/main/loss',
         'main/accuracy', 'validation/main/accuracy', 'elapsed_time']))
    trainer.extend(extensions.ProgressBar())

    if resume:
        chainer.serializers.load_npz(resume, trainer)

    trainer.run()