[Python] Numpy - create ordinal categories embedding

I've written the following code to one-hot encode a list of ints:

import numpy as np
a = np.array([1,2,3,4])

targets = np.zeros((a.size, a.max()))
targets[np.arange(a.size),a-1] = 1
targets


Output:

array([[1., 0., 0., 0.],
[0., 1., 0., 0.],
[0., 0., 1., 0.],
[0., 0., 0., 1.]])


I would like to change the code, to better fit my ordinal class problem, so that the output would be:

array([[1., 0., 0., 0.],
[1., 1., 0., 0.],
[1., 1., 1., 0.],
[1., 1., 1., 1.]])


How can I achieve this?

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