import torch


def main():
    print('===== Chapter 1 =====')
    chapter_1()


def chapter_1():
    x = torch.arange(12)
    print(f'x: {x}')
    print(f'x.shape: {x.shape}')
    print(f'x.numel(): {x.numel()}')
    xs = x.reshape(3, 4)
    print(f'x.reshape: {xs}')
    xs = x.reshape(-1, 4)
    print(f'x.reshape auto 1: {xs}')
    xs = x.reshape(3, -1)
    print(f'x.reshape auto 2: {xs}')

    zeros = torch.zeros((2, 3, 4))
    print(f'zeros: {zeros}')
    ones = torch.ones((2, 3, 4))
    print(f'ones: {ones}')

    randoms = torch.randn(3, 4)
    print(f'randn: {randoms}')

    manual = torch.tensor([[2, 1, 4, 3], [1, 2, 3, 4], [4, 3, 2, 1]])
    print(f'manual: {manual}')
    # 看起来reshape第一个是行数
    manual = torch.tensor([2, 1, 4, 3, 1, 2, 3, 4, 4, 3, 2, 1]).reshape(3, -1)
    print(f'manual: {manual}')


if __name__ == "__main__":
    main()