Root node

As explained in Natural Language Processing in Action, Second Edition

The root is the single word in a dependency tree that does not depend on another word in that tree.

How Natural Language Processing in Action, Second Edition covers it

How deep it goes

Explains the root definition, identifies it in a sentence, and inspects its children with spaCy.

Examples

Uses the sentence about Gebru being fired, a dependency table, child-token output, and a rendered dependency diagram.

What it assumes

Assumes familiarity with sentences and words while introducing dependency trees, heads, dependents, and grammatical relations.

What you can do after

Apply spaCy parsing to identify a sentence’s ROOT and inspect the words that depend on it.

How it connects

Connects root nodes to dependency parsing, dependency trees, grammatical relations, children, and knowledge graphs.

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Also explained in

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  Grokking Machine LearningThe top node of a decision tree associated with the complete input dataset before any split.
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  Statistics Every Programmer NeedsA root node is the topmost node in a decision tree and the initial point from which all branches originate.
• 

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  D3.js in Action, Third EditionA root node is the topmost node of a tree or hierarchy, which has no parent.
• 

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  Grokking AI Algorithms, Second EditionA root node is the topmost node in a tree and the starting point of its hierarchy.

Compare how 5 books explain root node →

Related concepts

• 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.
• decision treepart of · A decision tree is a branching structure that represents sequential tests or choices, with paths leading to outcomes, predictions, or actions.
• index levelkind of · An index level is a tier of labels or entries within a hierarchical index.
• heappart of · A binary heap is an almost complete binary tree in which each parent satisfies an ordering property relative to its children, enabling efficient access to a minimum or maximum element.
• causal graphical modelpart of · A causal graphical model is a probabilistic or structural model whose graph represents causal relationships and whose mechanisms support reasoning about interventions.
• treepart of · A tree is a connected, acyclic structure of nodes, commonly organized hierarchically through parent-child relationships and optionally around a designated root.

This explainer was generated by Manning's knowledge graph from the text of Natural Language Processing in Action, Second Edition. The section links point to the parts of the book it draws on.