code: def setUp(self):
      reader_file = UAIReader(
          "pgmpy/tests/test_readwrite/testdata/grid4x4_with_triplets.uai"
      )
      self.markov_model = reader_file.get_model()
  
      for factor in self.markov_model.factors:
          factor.values = np.log(factor.values)
      self.mplp = Mplp(self.markov_model)
  
file_path: pgmpy/pgmpy/tests/test_inference/test_mplp.py
imports: import unittest
  import numpy
  from pgmpy.inference.mplp import Mplp
  from pgmpy.readwrite import UAIReader
label_desc: Use image node_id 1 for calling the TestMplp obj's underlying member method code with example usage: obj.setUp() without return types