Equation 24 · Part 1 · Measuring What a RAG System Retrieves, Not Just What It Answers
Symbol k
What this part means
the 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
Recall at k , MRR and nDCG score a ranking function against labelled relevance judgements and never see the model’s written words.
The passage around this formula
A retrieval metric and a generation metric are not two views of the same fact. They are computed from different inputs, answer different questions, and can point in opposite directions at once. Recall at k , MRR and nDCG score a ranking function against labelled relevance judgements and never see the model’s written words. Faithfulness, answer relevance and groundedness score the written words against whatever context the retriever handed over and never check whether that context was the right one…
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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The article lists its research sources here.