Equation 22 · Part 1 · Retrieval Is an Evidence System, Not a Memory
Symbol k
What this part means
the scored with recall at.
Its job in the formula
k is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol k→Article meaning
Where the article explains it
Queries paired with the identifiers of spans that answer them, scored with recall at k and nDCG.
The passage around this formula
Build a retrieval-only test set first. Queries paired with the identifiers of spans that answer them, scored with recall at k and nDCG. It is cheaper to build than an answer-labelled set, it is reusable across generator changes, and it is the only artefact that survives a model swap.
Learn the underlying idea
A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.
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Sources cited in the article section
- [6] BEIR: A Heterogenous Benchmark for Zero-shot Evaluation of Information Retrieval Models ↗
- [17] Ragas: Automated Evaluation of Retrieval Augmented Generation ↗
- [18] Benchmarking Large Language Models in Retrieval-Augmented Generation ↗
These citations provide research context; check each source for the exact claim it supports.