code: def testHloModuleToHloGraph(self):
      computation = self.ExampleComputation()
      hlo_dot_graph = xla_client._xla.hlo_module_to_dot_graph(
          computation.as_hlo_module()
      )
      self.assertTrue(hlo_dot_graph.startswith("digraph "))
  
imports: import unittest
  from absl.testing import absltest
  import numpy
  from xla.python import xla_client
label_desc: Use image node_id 6 for calling the ComputationPrinting obj's underlying member method code with example usage: obj.testHloModuleToHloGraph() without return types