code: def _validate_accelerator(accel_obj):
      # because abstract_accelerator has different path during
      # build time (accelerator.abstract_accelerator)
      # and run time (deepspeed.accelerator.abstract_accelerator)
      # and extension would import the
      # run time abstract_accelerator/DeepSpeedAccelerator as its base
      # class, so we need to compare accel_obj with both base class.
      # if accel_obj is instance of DeepSpeedAccelerator in one of
      # accelerator.abstractor_accelerator
      # or deepspeed.accelerator.abstract_accelerator, consider accel_obj
      # is a conforming object
      if not (
          (dsa1 is not None and isinstance(accel_obj, dsa1))
          or (dsa2 is not None and isinstance(accel_obj, dsa2))
      ):
          raise AssertionError(
              f"{accel_obj.__class__.__name__} accelerator is not subclass of DeepSpeedAccelerator"
          )
  
imports: import os
label_desc: Use image node_id 1 for calling a global function with example usage: _validate_accelerator(accel_obj) without return types