博客链接
输入张量的形状 :（batch_size,color channels,height,width)
当经过一层卷积层后，输入张量的形状 :（batch_size, out_channels,height,width)
卷积层的权重张量的形状：(number of filters, number of input channels, filter height, filter width)，
也就是(out_channels, in_channels, filter height, filter width)
