code: def setUp(self):
      from bigdl.chronos.forecaster.tf.lstm_forecaster import (
          LSTMForecaster,
      )
  
      self.forecaster = LSTMForecaster(
          past_seq_len=10, input_feature_num=10, output_feature_num=2
      )
  
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 1 for calling the TestLSTMForecaster obj's underlying member method code with example usage: obj.setUp() without return types