weibozhao commented on a change in pull request #24:
URL: https://github.com/apache/flink-ml/pull/24#discussion_r752853041
##########
File path:
flink-ml-lib/src/main/java/org/apache/flink/ml/classification/knn/DenseMatrix.java
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@@ -0,0 +1,161 @@
+package org.apache.flink.ml.classification.knn;
+
+import java.io.Serializable;
+
+/**
+ * Knn DenseMatrix stores dense matrix data and provides some methods to
operate on the matrix it
+ * represents. This data structure helps knn to accelerate distance
calculation.
+ */
+public class DenseMatrix implements Serializable {
Review comment:
OK, I agree with you. I will move it later.
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