The role of conv1 * 1

Quoted from: https: //www.cnblogs.com/alilliam/p/11402448.html

Features:

1. done to enter in an enlarged or reduced value.

InputSize: 5 * 5 Matrix A, 1 * 1 Matrix B

OutputSize: 5 * 5 Matrix C

Analysis: cij = b * aij

2. L dimension or dimensionality reduction.

https://www.cnblogs.com/callyblog/p/7881018.html
https://blog.csdn.net/guoyunfei20/article/details/78401931

Ref.

https://iamaaditya.github.io/2016/03/one-by-one-convolution/