class_docstr: Connect to an already running gRPC server.
class_docstr_tok: ["Connect","to","an","already","running","gRPC","server","."]
code: def data_provider(self):
      return self._data_provider
  
imports: import errno
  import logging
  import os
  import subprocess
  import tempfile
  import time
  import grpc
  import pkg_resources
  from tensorboard.data import grpc_provider
  from tensorboard.data import ingester
  from tensorboard.data.proto import data_provider_pb2
  from tensorboard.util import tb_logging
label_desc: Use image node_id 2 for calling the ExistingServerDataIngester obj's underlying member method code with example usage: obj.data_provider() and returns: self