docstr: Parses pb proto.
docstr_tok: ["Parses","pb","proto","."]
code: def pb_via_op(self, summary_op):
      """Parses pb proto."""
      actual_pbtxt = summary_op.eval()
      actual_proto = summary_pb2.Summary()
      actual_proto.ParseFromString(actual_pbtxt)
      return actual_proto
  
file_path: tensorboard/tensorboard/plugins/mesh/summary_test.py
imports: import json
  import tensorflow
  from tensorboard.compat.proto import summary_pb2
  from tensorboard.plugins.mesh import summary
  from tensorboard.plugins.mesh import metadata
  from tensorboard.plugins.mesh import plugin_data_pb2
  from tensorboard.plugins.mesh import test_utils
label_desc: Use image node_id 1 for calling the MeshSummaryTest obj's underlying member method code with example usage: obj.pb_via_op(summary_op) and returns: actual_proto