code: def _try_mask_first_row(row, values, all_close, ignore_order):
      '''
      mask first row in 2d array
  
      values : 2d masked array
          Each row is either fully masked or not masked at all
      ignore_order : bool
          Ignore column order
  
      Return whether masked a row. If False, masked nothing.
      '''
      for row2 in values:
          mask = ma.getmaskarray(row2)
          assert mask.sum() in (0, len(mask))  # sanity check: all or none masked
          if mask[0]: # Note: at this point row2's mask is either all False or all True
              continue
  
          # mask each value of row1 in row2
          if _try_mask_row(row, row2, all_close, ignore_order):
              return True
      # row did not match
      return Falsf _try_mask_first_row(row, values, all_close, ignore_order):
      '''
      mask first row in 2d array
  
      values : 2d masked array
          Each row is either fully masked or not masked at all
      ignore_order : bool
          Ignore column order
  
      Return whether masked a row. If False, masked nothing.
      '''
      for row2 in values:
          mask = ma.getmaskarray(row2)
          assert mask.sum() in (0, len(mask))  # sanity check: all or none masked
          if mask[0]: # Note: at this point row2's mask is either all False or all True
              continue
  
          # mask each value of row1 in row2
          if _try_mask_row(row, row2, all_close, ignore_order):
              return True
      # row did not match
      return False
docs: mask first row in 2d array
  
      values : 2d masked array
          Each row is either fully masked or not masked at all
      ignore_order : bool
          Ignore column order
  
      Return whether masked a row. If False, masked nothing.