keyword
unstructured identifiers
Unstructured identifiers are discrete, arbitrary labels assigned to documents in generative information retrieval systems that carry no inherent semantic or hierarchical meaning. In models that directly map search queries to document representations, an unstructured identifier treats each document as an independent, atomic unit, typically encoded as a single unique token or arbitrary integer. Under this approach, the retrieval process is framed as a classification task over the entire set of individual document tokens, contrasting with structured identifier methods that utilize hierarchical clusters, semantic strings, or sequential subword representations to reflect relationships among documents.
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