class_docstr: Keeps track of `Sample` protos for pprof profile.
  
  Samples store the following statistics in order:
  count, all_time, op_time
docstr: Returns list of `Sample` protos for pprof profile.
docstr_tok: ["Returns","list","of","`","Sample","`","protos","for","pprof","profile","."]
code: def get_sample_protos(self):
      """Returns list of `Sample` protos for pprof profile."""
      return self._node_name_to_sample.values()
  
imports: from collections import defaultdict
  from collections import namedtuple
  import gzip
  import os
  import string
  import sys
  import time
  from proto import profile_pb2
label_desc: Use image node_id 3 for calling the Samples obj's underlying member method code with example usage: obj.get_sample_protos() and returns: self