code: def test_empty_experiment_from_pb():
      exp_pb = empty_experiment_pb()
      project = Project()
      expected = empty_experiment(project)
      assert pb_convert.experiment_from_pb(project, exp_pb) == expected
  
imports: import datetime
  from keepsake import pb_convert
  from keepsake.checkpoint import Checkpoint, PrimaryMetric, CheckpointList
  from keepsake.experiment import Experiment
  from keepsake.servicepb import keepsake_pb2
  from keepsake.project import Project
label_desc: Use image node_id 12 for calling a global function with example usage: test_empty_experiment_from_pb() without return types