mikemccand commented on a change in pull request #2022:
URL: https://github.com/apache/lucene-solr/pull/2022#discussion_r518797861
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File path: lucene/core/src/java/org/apache/lucene/index/VectorValues.java
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@@ -74,6 +74,18 @@ public BytesRef binaryValue() throws IOException {
throw new UnsupportedOperationException();
}
+ /**
+ * Return the k nearest neighbor documents as determined by comparison of
their vector values
+ * for this field, to the given vector, by the field's search strategy. If
the search strategy is
+ * reversed, lower values indicate nearer vectors, otherwise higher scores
indicate nearer
+ * vectors. Unlike relevance scores, vector scores may be negative.
+ * @param target the vector-valued query
+ * @param k the number of docs to return
+ * @param fanout control the accuracy/speed tradeoff - larger values give
better recall at higher cost
Review comment:
> Yeah, I think there needs to be a follow-on exposing the index-time
controls, which indeed are much more potent than this search-time fanout, which
has only a small impact on recall and latency. In this patch they are globals
in HnswGraphBuilder, but there is no API for setting them.
OK, makes sense.
> I am thinking the index-time hyperparameters would be specified in
IndexWriterConfig?
Hmm, maybe these could be codec level controls? Or maybe `FieldInfo`? They
would be per-vector-field configuration right?
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