code: def test_nbeats_forecaster_import(self):
      from bigdl.chronos.forecaster.pytorch import NBeatsForecaster
  
      assert isinstance(NBeatsForecaster, LazyImport)
  
      nbeats = NBeatsForecaster(past_seq_len=48, future_seq_len=5)
      from bigdl.chronos.forecaster.nbeats_forecaster import (
          NBeatsForecaster,
      )
  
      assert not isinstance(NBeatsForecaster, LazyImport)
      assert isinstance(nbeats, NBeatsForecaster)
  
file_path: BigDL/python/chronos/test/bigdl/chronos/forecaster/test_pytorch.py
imports: from unittest import TestCase
  from bigdl.chronos.utils import LazyImport
  from ..None import op_torch
label_desc: Use image node_id 5 for calling the TestChronosModelPytorch obj's underlying member method code with example usage: obj.test_nbeats_forecaster_import() without return types