How convert multidimensional array to two dimensional array

[scidam]

I am not sure I understand you correctly, but
if you want to convert

[
array([[0,0,0],[0,0,0]]),
array([0,0,0])
]

to

array(
[0,0,0]
[0,0,0]
[0,0,0])

you can do this using numpy.vstack function, e.g.

import numpy as np
sample_data = [np.random.rand(np.random.randint(2, 4), 3) for s in range(10)]
sample_data.append(np.array([5,6,7]))

Ok, sample_data consists of arrays of different size with common number of columns 3,
so these arrays could be stacked using np.vstack:

np.vstack(sample_data)