code: def is_cpat_compatible(gtf):
      
      if not gtf:
          return False
      db = get_gtf_db(gtf)
      pred = lambda biotype: biotype and biotype == "protein_coding"
      biotype_lookup = _biotype_lookup_fn(gtf)
      if not biotype_lookup:
          return False
      db = get_gtf_db(gtf)
      for feature in db.all_features():
          biotype = biotype_lookup(feature)
          if pred(biotype):
              return True
      return False
docs: CPAT needs some transcripts annotated with protein coding status to work
      properly