Fix import in 2to3 transition
Fix import in 2to3 transition

amwenger/dd-genomics,HazyResearch/dd-genomics,HazyResearch/dd-genomics,rionda/dd-genomics,HazyResearch/dd-genomics,amwenger/dd-genomics,rionda/dd-genomics,HazyResearch/dd-genomics,HazyResearch/dd-genomics,amwenger/dd-genomics