code: def test_get_initial_belief_system(self):
      belief_expected = [
          {
              "Var": "rover_0",
              "Parent": ["null"],
              "Type": "TBL",
              "Parameter": [
                  {
                      "Instance": ["-"],
                      "ProbTable": ["0.0", "1.0", "0.0"],
                  }
              ],
          },
          {
              "Var": "rock_0",
              "Parent": ["null"],
              "Type": "TBL",
              "Parameter": [
                  {"Instance": ["-"], "ProbTable": ["uniform"]}
              ],
          },
      ]
      self.maxDiff = None
      self.assertEqual(
          self.reader_string.get_initial_beliefs(), belief_expected
      )
      self.assertEqual(
          self.reader_file.get_initial_beliefs(), belief_expected
      )
  
imports: import io
  import sys
  import unittest
  import xml.etree.ElementTree
  from pgmpy.readwrite import PomdpXReader, PomdpXWriter
label_desc: Use image node_id 3 for calling the TestPomdpXReaderStringTorch obj's underlying member method code with example usage: obj.test_get_initial_belief_system() without return types