code: def test_feature_precision(self):
      # feature precision decides the least change that can be made to the feature in optimization,
      # given as 2-decimal place for 'hours_per_week' feature while initiating private Data object.
      assert self.d.get_decimal_precisions()[1] == 2
  
imports: from collections import OrderedDict
  import pytest
  import dice_ml
label_desc: Use image node_id 3 for calling the TestPrivateDataMethods obj's underlying member method code with example usage: obj.test_feature_precision() without return types