code: def get_unique_identifier(experiment: Experiment) -> str:
      """
      Return a unique identifier for an experiment so creation and completion
      events can be joined.
      """
      str_time = datetime.strftime(
          experiment.time_created, "%Y-%m-%d %H:%M:%S"
      )
      return f"{experiment.name}_{str_time}"
  
file_path: Ax/ax/telemetry/common.py
imports: from datetime import datetime
  from typing import Any, Dict, List, Tuple, Type
  from ax.core.experiment import Experiment
  from ax.modelbridge.generation_strategy import GenerationStep, GenerationStrategy
  from ax.modelbridge.modelbridge_utils import extract_search_space_digest, transform_search_space
  from ax.modelbridge.registry import ModelRegistryBase, Models, SearchSpace
  from ax.modelbridge.transforms.base import Transform
  from ax.modelbridge.transforms.cast import Cast
label_desc: Use image node_id 3 for calling a global function with example usage: get_unique_identifier(experiment) and returns: experiment, str, str_time