Fix bug in sparser multiprocessing.
Fix bug in sparser multiprocessing.

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