class_docstr: Represents a single abstract node in an H2OTree.
  
  :param id: Node's unique identifier (integer). Generated by H2O.
  
  :examples:
  
  >>> from h2o.tree import H2OTree
  >>> from h2o.tree import H2ONode
  >>> from h2o.estimators import H2OGradientBoostingEstimator
  >>> airlines= h2o.import_file("https://s3.amazonaws.com/h2o-public-test-data/smalldata/airlines/allyears2k_headers.zip")
  >>> gbm = H2OGradientBoostingEstimator(ntrees=1)
  >>> gbm.train(x=["Origin", "Dest"],
  ...           y="IsDepDelayed",
  ...           training_frame=airlines)
  >>> tree = H2OTree(model = gbm, tree_number = 0 , tree_class = "NO")
  >>> tree.node_ids
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code: def __init__(self, node_id):
      self._id = node_id
  
imports: import math
  import h2o
label_desc: Use image node_id 1 to create a new H2ONode object  with example: obj = H2ONode(node_id)