code: def get_med_dp(variant_call):
      """Gets the 'MED_DP' field of the VariantCall."""
      return struct_utils.get_int_field(
          variant_call.info, "MED_DP", is_single_field=True
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from third_party.nucleus.protos import struct_pb2
  from third_party.nucleus.protos import variants_pb2
  from third_party.nucleus.util import struct_utils
  from third_party.nucleus.util import vcf_constants
label_desc: Use image node_id 12 for calling a global function with example usage: get_med_dp(variant_call) and returns: struct_utils