code: def _eval(backend, op_or_result):
      if bps._executing_eagerly():
          return op_or_result
      else:
          return backend.get_session().run(op_or_result)
  
imports: import byteps.tensorflow
  import tensorflow
label_desc: Use image node_id 2 for calling a global function with example usage: _eval(backend, op_or_result) and returns: op_or_result, backend