2 Fixes: 1. Handle non-sparse AnnData correctly for wilcoxon 2. Correct nan in wilcoxon (usually they should not appear)
2 Fixes:
1. Handle non-sparse AnnData correctly for wilcoxon
2. Correct nan in wilcoxon (usually they should not appear)

Include two alternative computation methods for wilcoxon rank sum test

theislab/scanpy,theislab/scanpy