code: def tearDown(self):
      del self.forecaster
  
imports: import pytest
  import tempfile
  import os
  from unittest import TestCase
  import numpy
  from bigdl.chronos.utils import LazyImport
  from test.bigdl.chronos import op_tf2, op_distributed
label_desc: Use image node_id 2 for calling the TestLSTMForecaster obj's underlying member method code with example usage: obj.tearDown() without return types