The Python NLTK (Natural Language Toolkit) library provides the class nltk.tree.ParentedTree, which represents a tree structure with each node having a reference to its parent node. This class allows for easy navigation and manipulation of tree structures, making it useful for tasks such as parsing and analyzing linguistic data. It allows users to access the parent node of each tree node, which helps in traversing the tree and accessing hierarchical relationships between nodes. This class is widely used in natural language processing tasks where tree structures are commonly used to represent syntactic or semantic relationships.
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