Pending DeprecationWarning for matrix subclass

When executing test/test_gamale.py you get a pending deprecation warning:

test_01_load_and_dimensions (main.TestLens) Test raw mldat matrices with simple load function ... /home/marcus/.local/lib/python3.7/site-packages/numpy/matrixlib/defmatrix.py:68: PendingDeprecationWarning: the matrix subclass is not the recommended way to represent matrices or deal with linear algebra (see https://docs.scipy.org/doc/numpy/user/numpy-for-matlab-users.html). Please adjust your code to use regular ndarray. return matrix(data, dtype=dtype, copy=False)