lapjv solver

[berhane]

I'm trying to solve a simple 4x4 assignment problem using lapjv,

import numpy as np
from centrosome import lapjv
size=4
matrix=np.random.random((size,size))
assignment=lapjv.lapjv(size,size,matrix)

but keep getting an error message saying the dimensions of i,j don't match those of the cost matrix even though they do.

Traceback
(most recent call last):
File "", line 1, in
File "/usr/local/lib/python3.7/site-packages/centrosome/lapjv.py", line 42, in lapjv
assert len(i) == len(costs), "costs must be the same length as i"
AssertionError: costs must be the same length as i

What am I missing? I'm using

python 3.7.1
numpy-1.15.4
centrosome 1.1.6