[stderr]
/gpfs/share/apps/cellranger/arc-2.0.0/external/anaconda/lib/python3.7/site-packages/numpy/core/fromnumeric.py:3373: RuntimeWarning: Mean of empty slice.
  out=out, **kwargs)
/gpfs/share/apps/cellranger/arc-2.0.0/external/anaconda/lib/python3.7/site-packages/numpy/core/_methods.py:170: RuntimeWarning: invalid value encountered in double_scalars
  ret = ret.dtype.type(ret / rcount)
