Decision node
A decision node is a tree node where a decision, test, or action selection determines which successor branch is followed.
Statistics Every Programmer Needs
A decision node is a decision-tree node that evaluates a condition to split observations into branches.
- How it is used
- Distinguishes feature-based branching in predictive trees from action choices in trees for decisions under uncertainty.
- How deep it goes
- Works through split counts and Gini-based interpretation, plus a procedural schema and backward payoff calculation for choice trees.
- Examples
- Uses fourth-down conversion splits and a baseball contract choice with health, performance incentives, and agent fees.
- What you can do after
- Evaluate/understand predictive split paths and build a choice-tree schema that separates actions from uncertain outcomes.
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Grokking Machine Learning
An internal decision-tree node that represents a yes-or-no question and has two outgoing branches.
- How it is used
- Represents each yes-or-no question that routes a decision-tree example or dataset into two branches.
- How deep it goes
- Defines two-way branching, then uses decision nodes in feature-based data splits; tree-building examples also address split metrics and stopping conditions.
- Examples
- Uses a jacket decision tree and app recommendations split first by age and then by platform.
- What you can do after
- Build a decision tree by recursively splitting labeled data on selected features until leaves are pure or a stopping condition applies.
Grokking AI Algorithms, Second Edition
A decision node is an internal node of a decision tree that contains a test used to partition examples.
- How it is used
- Partitions examples with questions while building a decision tree for classification.
- How deep it goes
- Defines node contents and walks through question testing, splitting, and recursive construction; notes overfitting without detailing constraints.
- Examples
- Uses Okay and Perfect diamond labels, carat and price thresholds, and a Python decision-node class.
- What you can do after
- Build it from scratch as a Python node with a question and recursively constructed true and false branches.
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Related concepts
- decision treepart of · A decision tree is a branching structure that represents sequential tests or choices, with paths leading to outcomes, predictions, or actions.
- nodekind of · A node is a discrete element in a structured system, such as a graph, tree, network, or distributed system, representing an entity, state, component, or computational unit and potentially connected to other elements.
- Gini impuritymeasured by · Gini impurity is a measure of class-label heterogeneity in a set or decision-tree node, calculated from the proportions of its classes.
- chance nodecontrasts with · A chance node is a decision-tree node representing an uncontrollable uncertain event, with branches for its possible outcomes and their probabilities.
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