code: def identity(x):
      """Identity function. Returns x.
      >>> identity(3)
      3
      """
      return x
  
file_path: ray/python/ray/util/dask/scheduler_utils.py
imports: import os
  from queue import Queue, Empty
  from dask import config
  from dask.callbacks import local_callbacks, unpack_callbacks
  from dask.core import _execute_task, flatten, get_dependencies, has_tasks, reverse_dict
  from dask.order import order
label_desc: Use image node_id 9 for calling a global function with example usage: identity(x) and returns: x