mayya-sharipova commented on a change in pull request #267:
URL: https://github.com/apache/lucene/pull/267#discussion_r700574452



##########
File path: lucene/core/src/java/org/apache/lucene/util/hnsw/HnswGraph.java
##########
@@ -107,32 +113,82 @@ public static NeighborQueue search(
       Random random)
       throws IOException {
     int size = graphValues.size();
+    int boundedNumSeed = Math.min(numSeed, 2 * size);
+    NeighborQueue results;
+
+    if (graphValues.maxLevel() == 0) {
+      // search in SNW; generate a number of entry points randomly
+      final int[] eps = new int[boundedNumSeed];
+      for (int i = 0; i < boundedNumSeed; i++) {
+        eps[i] = random.nextInt(size);
+      }
+      return searchLevel(query, topK, 0, eps, vectors, similarityFunction, 
graphValues, acceptOrds);
+    } else {
+      // search in hierarchical SNW
+      int[] eps = new int[] {graphValues.entryNode()};
+      for (int level = graphValues.maxLevel(); level >= 1; level--) {
+        results =
+            HnswGraph.searchLevel(
+                query, 1, level, eps, vectors, similarityFunction, 
graphValues, acceptOrds);
+        eps = new int[] {results.pop()};

Review comment:
       Good comment, addressed in 6a05951




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