Tree Class in H2O¶
H2O Tree Class
¶

class
h2o.tree.
H2OTree
(model, tree_number, tree_class=None)[source]¶ Bases:
object
Represents a model of a Tree built by one of H2O’s algorithms (GBM, Random Forest).

descriptions
¶ Descriptions for each node to be found in the tree. Contains split threshold if the split is based on numerical column. For categorical splits, it contains a list of categorical levels for transition from the parent node.

features
¶ Names of the feature/column used for the split.

left_children
¶ An array with left child nodes of tree’s nodes

levels
¶ Categorical levels on split from parent’s node belonging into this node. None for root node or noncategorical splits.

model_id
¶ Name (identification) of the model this tree is related to.

nas
¶ representing if NA values go to the left node or right node. The value may be None if node is a leaf or there is no possibility of an NA value appearing on a node.

node_ids
¶ Array with identification numbers of nodes. Node IDs are generated by H2O.

predictions
¶ Values predicted on tree’s nodes.

right_children
¶ An array with right child nodes of tree’s nodes

root_node
¶ An instance of H2ONode representing the beginning of the tree behind the model. Allows further tree traversal.

thresholds
¶ Node split thresholds. Split thresholds are not only related to numerical splits, but might be present in case of categorical split as well.

tree_class
¶ The name of a tree’s class.
The number of tree classes equals the number of levels in the categorical response column. As there is exactly one class per categorical level, the name of tree’s class is equal to the corresponding categorical level of the response column.
In the case of regression and binomial, the name of the categorical level is ignored can be omitted, as there is exactly one tree built in both cases.

tree_number
¶ The order in which the tree has been built in the model.

H2O Node Class
¶
H2O Leaf Node Class
¶
H2O Split Node Class
¶

class
h2o.tree.
H2OSplitNode
(node_id, threshold, left_child, right_child, split_feature, na_direction, left_levels, right_levels)[source]¶ Bases:
h2o.tree.tree.H2ONode
Represents a single node with either numerical or categorical split in an H2OTree with all its attributes.

id
¶ Node’s unique identifier (integer). Generated by H2O.

left_child
¶ Integer identifier of the left child node, if there is any. Otherwise None.

left_levels
¶ Categorical levels on the edge from this node to the left child node. None for noncategorical splits.

na_direction
¶ The direction of NA values. LEFT means NA values go to the left child node, RIGH means NA values go to the right child node.
A value of None means occurance of NA for the given split column is not possible on this node due to an earlier split on the very same feature.

right_child
¶ Integer identifier of the right child node, if there is any. Otherwise None.

right_levels
¶ Categorical levels on the edge from this node to the right child node. None for noncategorical splits.

split_feature
¶ The name of the column this node splits on.

threshold
¶ Split threshold, typically when the split column is numerical.
