[HPC_AI][AI for Science Climate]Improvements

[mozhgan-kch]

A suggestion from an attendee for the file Countering_Data_Imbalance.ipynb:

    (h, w) = (232,232)
    center = (w / 2, h / 2)
    angle90 = 90
    angle180 = 180
    angle270 = 270
    scale = 1.0

The variables seem unused and can likely be deleted.