code: def example_1_4():
      happy_gen = HappyGeneration()
      args = GENEvalArgs(preprocessing_processes=2)
      result = happy_gen.eval(
          "../../data/gen/train-eval.txt", args=args
      )
      print(
          type(result)
      )  # <class 'happytransformer.happy_trainer.EvalResult'>
      print(result)  # EvalResult(loss=3.3437771797180176)
      print(result.loss)
  
imports: from happytransformer import HappyGeneration, GENSettings, GENTrainArgs, GENEvalArgs
label_desc: Use image node_id 5 for calling a global function with example usage: example_1_4() without return types