Python constructor of EMD distance

[ghost]

In python, calling an EMD object constructed by

EMD(rows: int, cols: int)
EMD(rows: int, cols: int, extra_mass_penalty: int)

results in Assertion failed: (C[i][j] >= 0), function operator(), file /Users/travis/build/jura-gresko/metric-wheels/metric/modules/distance/k-structured/EMD.cpp, line 727.

Example:

n = 3
distance = EMD(rows=n, cols=n)
A = [1, 0, 0, 0, 0, 0, 0, 0, 0]
B = [0, 0, 0, 0, 0, 1, 0, 0, 0]
print(distance(A, B))

When trying other values for n and other lengths for A and B, I sometimes also get a segmentation fault.