cammiemw commented on a change in pull request #2097:
URL: https://github.com/apache/lucene-solr/pull/2097#discussion_r532907950
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File path: lucene/core/src/java/org/apache/lucene/search/Scorable.java
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@@ -30,6 +30,13 @@
* Returns the score of the current document matching the query.
*/
public abstract float score() throws IOException;
+
+ /**
+ * Returns the smoothing score of the current document matching the query.
+ * This score is used when the query/term does not appear in the document.
+ * This can return 0 or a smoothing score.
Review comment:
I have added more detail and a paper the describes the motivation of the
smoothing score. The description of how the smoothing score is used is at the
bottom of page 11 in the paper. It is important to note that most of the
explanation has to do with when the score is a product. Even though the
IndriAndScorer does not use a product, the smoothing score is still helpful for
acting like an idf. Additionally, there are many more Indri operators that I
would like to add that do use a product.
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