code: def _create_get_fn_cache(fields):
      """Returns a dictionary from field to a callable that extracts its value."""
      return {
          field.id: vcf_constants.create_get_fn(
              field.type, field.number
          )
          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 1 for calling a global function with example usage: _create_get_fn_cache(fields) and returns: unknown