deconv/transpose conv, pixel shu

上采样通常有四种方式：

• upsample / Interpolation

• unpooling

• deconvolution / transpose convolution

• pixel shuffle / sub-pixel convolution

• 反卷积/转置卷积：原理上是转置、逆变换，形式上是先padding再卷积，使得输出分辨率变大：https://github.com/vdumoulin/conv_arithmetic、https://blog.csdn.net/qq_16234613/article/details/79387345、https://blog.csdn.net/Fate_fjh/article/details/52882134

• pixel_shuffle/sub-pixel conv：https://blog.csdn.net/g11d111/article/details/82855946、https://blog.csdn.net/shwan_ma/article/details/78440394