Tips for python and numpy from weird bugs

Tips to avoid weird bugs in Python code:

• Don't work with data structure with shape like (5, ) or (, 3) such as a.np.random.randn(5) creating a "rank 1 array" with shape (5, ). Should always making data either a row vector (1, 5) or a column vector (5, 1)
• Use assert(a.shape == (5,1)) to check for shape
• Re-shape a rank 1 array by using reshape: a = a.reshape((5,1))
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