code: def test_s2s_forecaster_import(self):
      from bigdl.chronos.forecaster.pytorch import Seq2SeqForecaster
  
      assert isinstance(Seq2SeqForecaster, LazyImport)
  
      from bigdl.chronos.forecaster.seq2seq_forecaster import (
          Seq2SeqForecaster,
      )
  
      s2s = Seq2SeqForecaster(
          past_seq_len=48,
          future_seq_len=5,
          input_feature_num=1,
          output_feature_num=1,
      )
      assert not isinstance(Seq2SeqForecaster, LazyImport)
      assert isinstance(s2s, Seq2SeqForecaster)
  
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 6 for calling the TestChronosModelPytorch obj's underlying member method code with example usage: obj.test_s2s_forecaster_import() without return types