Update to sparse_nonzero and matrix_conflicts for dense, CRC, LIL matrices
Update to sparse_nonzero and matrix_conflicts for dense, CRC, LIL matrices

HazyResearch/snorkel,jasontlam/snorkel,HazyResearch/snorkel,jasontlam/snorkel,HazyResearch/snorkel,jasontlam/snorkel