code: def _create_set_fn_cache(fields):
      """Returns a dictionary from field to a callable that sets its value."""
      return {
          field.id: vcf_constants.SET_FN_LOOKUP[field.type]
          for field in fields
      }
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from third_party.nucleus.io import genomics_reader
  from third_party.nucleus.io import genomics_writer
  from third_party.nucleus.io.python import vcf_reader
  from third_party.nucleus.io.python import vcf_writer
  from third_party.nucleus.protos import variants_pb2
  from third_party.nucleus.util import ranges
  from third_party.nucleus.util import variant_utils
  from third_party.nucleus.util import vcf_constants
label_desc: Use image node_id 2 for calling a global function with example usage: _create_set_fn_cache(fields) and returns: unknown