code: def test_forward_inf_single_variable(self):
      query_result = self.dbn_inference_1.forward_inference([("X", 0)])
      np_test.assert_array_almost_equal(
          query_result[("X", 0)].values, np.array([0.84, 0.16])
      )
  
file_path: pgmpy/pgmpy/tests/test_inference/test_dbn_inference.py
imports: import unittest
  import numpy
  import numpy.testing
  from scipy.special import softmax
  from pgmpy.inference import DBNInference
  from pgmpy.models import DynamicBayesianNetwork
  from pgmpy.factors.discrete import TabularCPD
label_desc: Use image node_id 2 for calling the TestDBNInference obj's underlying member method code with example usage: obj.test_forward_inf_single_variable() without return types