All glory to NumPy! Long may it live.

numpy-commands.md

Useful commands for Numpy

import numpy as np

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Arrays

• Random mask for shuffle
  np.random.permutation(size)
• Split array a into N pieces
  np.array_split(a, N)
• Initialize empty array and join
  a = np.empty(shape=(0, b.shape[1]))
np.concatenate((a, b), axis=0)