code: def h2ocluster():
      """
      Python API test: h2o.cluster()
      """
      ret = h2o.cluster()
      assert_is_type(ret, H2OCluster)
  
imports: import sys
  from tests import pyunit_utils
  import h2o
  from h2o.backend.cluster import H2OCluster
  from h2o.utils.typechecks import assert_is_type
label_desc: Use image node_id 1 for calling a global function with example usage: h2ocluster() without return types