code: def _check_copy_number_changes(svtype, cn, minor_cn, data):
      
      if svtype == "LOH" and minor_cn == 0:
          return svtype
      elif svtype == "amplification" and cn > dd.get_ploidy(data):
          return svtype
      else:
          return "std"
docs: Check if copy number changes match the expected svtype.