code: def _create_genome_builds(self):
          
  
          # TODO add more species
  
          graph = self.graph
          geno = Genotype(graph)
          model = Model(graph)
          LOG.info("Adding equivalent assembly identifiers")
          for sp in self.species:
              tax_id = self.globaltt[sp]
              txid_num = tax_id.split(':')[1]
              for key in self.files[txid_num]['assembly']:
                  ucsc_id = key
                  try:
                      ucsc_label = ucsc_id.split(':')[1]
                  except IndexError:
                      LOG.error('%s Assembly id:  "%s" is problematic', sp, key)
                      continue
                  if key in self.localtt:
                      mapped_id = self.localtt[key]
                  else:
                      LOG.error(
                          '%s Assembly id:  "%s" is not in local translation table',
                          sp, key)
  
                  mapped_label = mapped_id.split(':')[1]
  
                  mapped_label = 'NCBI build ' + str(mapped_label)
                  geno.addReferenceGenome(ucsc_id, ucsc_label, tax_id)
                  geno.addReferenceGenome(mapped_id, mapped_label, tax_id)
                  model.addSameIndividual(ucsc_id, mapped_id)
  
          return
docs: Various resources will map variations to either UCSC (hg*)
          or to NCBI assemblies. Here we create the equivalences between them.
          Data taken from:
          https://genome.ucsc.edu/FAQ/FAQreleases.html#release1
  
          :return: