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DS-1000 / 451 / I want to make an 4 dimensional array of zeros in python. I know how to do this…

Problem

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Problem:
I want to make an 4 dimensional array of zeros in python. I know how to do this for a square array but I want the lists to have different lengths.
Right now I use this:
arr = numpy.zeros((20,)*4)
Which gives them all length 20 but I would like to have arr's lengths 20,10,10,2 because now I have a lot of zeros in arr that I don't use
A:
<code>
import numpy as np
</code>
arr = ... # put solution in this variable
BEGIN SOLUTION
<code>

library

Numpy

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Source and history

upstream_id / Original problem ID
451
task_id
96a10ffe-3d36-592c-b4d6-ab8a48a8e0de
task_key
default--test--451
task_revision_id
1
config / split
default / test

Official source

initial import