code: def get(cls, initialize: bool = True) -> Optional["OrcaRayContext"]:
      if OrcaRayContext._active_ray_context:
          ray_ctx = OrcaRayContext._active_ray_context
          if initialize and not ray_ctx.initialized:
              ray_ctx.init()
          return ray_ctx
      else:
          invalidInputError(
              False,
              "No active RayContext. "
              "Please call init_orca_context to create a RayContext.",
          )
      return None
  
file_path: BigDL/python/orca/src/bigdl/orca/ray/raycontext.py
imports: import os
  from threading import Lock
  from bigdl.dllib.utils.log4Error import invalidInputError
  from typing import Optional
label_desc: Use image node_id 4 for calling the OrcaRayContext obj's underlying member method code with example usage: obj.get(cls, initialize) and returns: None, ray_ctx