code: def _pickle_load_golden(self, file):
      with open(f"haiku/_src/testdata/{file}.pkl", "rb") as fp:
          return pickle.load(fp)
  
imports: import collections
  import copy
  import pickle
  import threading
  from absl.testing import absltest
  from absl.testing import parameterized
  import cloudpickle
  import dill
  from haiku._src import data_structures
  import jax
  import tree
label_desc: Use image node_id 15 for calling the FlatMappingTest obj's underlying member method code with example usage: obj._pickle_load_golden(file) and returns: pickle