code: def meta_data(
      tag="meta_data_tag", display_name="", step=0, walltime=None
  ):
      """Package data to one meta_data.
  
      Meta data is info for one record file, include `display_name` etc.
  
      Args:
          tag (string): Data identifier
          display_name (string): Replace
          step (int): Step of scalar
          walltime (int): Wall time of scalar
  
      Return:
          Package with format of record_pb2.Record
      """
      meta = Record.MetaData(display_name=display_name)
      return Record(
          values=[
              Record.Value(
                  id=step, tag=tag, timestamp=walltime, meta_data=meta
              )
          ]
      )
  
imports: import numpy
  from PIL import Image
  from visualdl.proto.record_pb2 import Record
label_desc: Use image node_id 3 for calling a global function with example usage: meta_data(tag, display_name, step, walltime) and returns: Record