code: def _get_histogram_proto(self, proto_bytes):
      histogram_proto = summary_pb2.HistogramProto()
      histogram_proto.ParseFromString(proto_bytes)
      return histogram_proto
  
imports: import os
  from tensorflow.core.framework import summary_pb2
  from tensorflow.core.framework import versions_pb2
  from tensorflow.core.protobuf import fingerprint_pb2
  from tensorflow.python.eager import test
  from tensorflow.python.saved_model.pywrap_saved_model import metrics
label_desc: Use image node_id 1 for calling the MetricsTest obj's underlying member method code with example usage: obj._get_histogram_proto(proto_bytes) and returns: histogram_proto