Implement init and prep input for sparser.
Implement init and prep input for sparser.

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