Normalization Zoo

Normalization in deep learning is to shift and scale a tensor such that the activation will run at the sweet spot. This helps to solve the problems such as vanishing/exploding gradients, weight initialization, training stability, and convergence. [more]

Black and White

There is no black and white. Human perceived black for no visible light, and some composition of light wavelengths is perceived as white. To measure the grayscale, we want to quantify what is black and what is white. [more]

Timezone in Python

The UNIX epoch is always in UTC. There’s no such thing as local epoch. To get the epoch in command line, you do date +%s, or in Python, time.time(). It doesn’t matter if time.localtime() and time.gmtime() are different, the epoch is universally consistent across timezone. [more]