jtibshirani commented on code in PR #872:
URL: https://github.com/apache/lucene/pull/872#discussion_r869686535
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lucene/core/src/java/org/apache/lucene/util/hnsw/HnswGraphBuilder.java:
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@@ -43,7 +43,8 @@ public final class HnswGraphBuilder {
/** Random seed for level generation; public to expose for testing * */
public static long randSeed = DEFAULT_RAND_SEED;
- private final int maxConn;
+ private final int M; // max number of connections on upper layers
+ private final int maxConn0; // max number of connections on the 0th (last)
layer
Review Comment:
Small comment, I think it'd be clearer to just store the parameter `M` and
compute `maxConn0` on the fly. It's such a simple calculation it doesn't really
help to store it.
##########
lucene/core/src/java/org/apache/lucene/util/hnsw/HnswGraphBuilder.java:
##########
@@ -68,42 +69,43 @@ public final class HnswGraphBuilder {
*
* @param vectors the vectors whose relations are represented by the graph -
must provide a
* different view over those vectors than the one used to add via
addGraphNode.
- * @param maxConn the number of connections to make when adding a new graph
node; roughly speaking
- * the graph fanout.
+ * @param M the number of connections to make when adding a new graph node;
roughly speaking the
Review Comment:
I guess we should update this to mention that the last layer is treated
differently (it uses max 2*M connections?)
##########
lucene/core/src/test/org/apache/lucene/util/hnsw/TestHnswGraph.java:
##########
@@ -256,10 +256,11 @@ public void testSearchWithSelectiveAcceptOrds() throws
IOException {
public void testSearchWithSkewedAcceptOrds() throws IOException {
int nDoc = 1000;
+ int maxConn = 16;
Review Comment:
I guess this should be called `M`? Or maybe we don't even need to pull out
this parameter?
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