fix annoy l2 (#3232)

shengjun.li · web-flow · commit 43c272fd134c · 2020-08-12T19:11:13.000+08:00
Signed-off-by: shengjun.li &lt;shengjun.li@zilliz.com&gt;
diff --git a/core/src/index/thirdparty/annoy/src/annoylib.h b/core/src/index/thirdparty/annoy/src/annoylib.h
@@ -783,7 +783,7 @@ struct Euclidean : Minkowski {
   }
   template<typename T>
   static inline T normalized_distance(T distance) {
-    return sqrt(std::max(distance, T(0)));
+    return distance;
   }
   template<typename S, typename T>
   static inline void init_node(Node<S, T>* n, int f) {

Original file line number	Diff line number	Diff line change
`@@ -783,7 +783,7 @@ struct Euclidean : Minkowski {`
`783`	`783`	`}`
`784`	`784`	`template<typename T>`
`785`	`785`	`static inline T normalized_distance(T distance) {`
`786`		`- return sqrt(std::max(distance, T(0)));`
	`786`	`+ return distance;`
`787`	`787`	`}`
`788`	`788`	`template<typename S, typename T>`
`789`	`789`	`static inline void init_node(Node<S, T>* n, int f) {`