If you want to get a 1-D array of a multi-dimensional array, try np.ravel(arr). You can either read the elements in the same row first or read the elements in the same column first.
Find an example of the np.ravel method above.
np.ravel: Flatten a Numpy Array
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What is the importance of the order argument in np.ravel ?
When flattening a multi-dimensional array, you might want to read the elements in the same columns first instead of reading the elements in the same rows first.