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Numpy pit: after the addition of dimension (n, 1) and dimension (n,) array, the dimension becomes (n, n)

Define a $(100, 1)$ An array of dimensions

a = np.ones((100, 1))
a.shape

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Define a $(100,)$ An array of dimensions

b = np.ones((100,))
b.shape

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Add two arrays

(a + b).shape

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