a = shape (2, 3)
Try
Spaces or commas between values · new line = new row · blank line = new 2-D layer (3-D array).
axis
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import numpy as np
a = np.array([[1, 2, 3],
[4, 5, 6]])
b = np.array([[ 7, 8, 9],
[10, 11, 12]])
result = np.concatenate([a, b], axis=0)
resultOutput
Output appears here.