Fix issue with np.random.choice from list of lists.
Fix issue with np.random.choice from list of lists.

johnbachman/belpy,bgyori/indra,pvtodorov/indra,sorgerlab/belpy,pvtodorov/indra,bgyori/indra,sorgerlab/indra,johnbachman/belpy,pvtodorov/indra,sorgerlab/belpy,johnbachman/indra,johnbachman/indra,johnbachman/belpy,johnbachman/indra,pvtodorov/indra,sorgerlab/indra,sorgerlab/indra,bgyori/indra,sorgerlab/belpy