weibozhao commented on a change in pull request #24:
URL: https://github.com/apache/flink-ml/pull/24#discussion_r752856415
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File path:
flink-ml-lib/src/main/java/org/apache/flink/ml/classification/knn/Knn.java
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@@ -0,0 +1,220 @@
+package org.apache.flink.ml.classification.knn;
+
+import org.apache.flink.api.common.functions.MapFunction;
+import org.apache.flink.api.common.functions.RichMapPartitionFunction;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.api.java.typeutils.RowTypeInfo;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.ml.api.core.Estimator;
+import org.apache.flink.ml.common.MapPartitionFunctionWrapper;
+import org.apache.flink.ml.linalg.DenseVector;
+import org.apache.flink.ml.param.Param;
+import org.apache.flink.ml.util.ParamUtils;
+import org.apache.flink.ml.util.ReadWriteUtils;
+import org.apache.flink.streaming.api.datastream.DataStream;
+import org.apache.flink.table.api.Table;
+import org.apache.flink.table.api.bridge.java.StreamTableEnvironment;
+import org.apache.flink.table.api.internal.TableImpl;
+import org.apache.flink.table.catalog.ResolvedSchema;
+import org.apache.flink.table.types.DataType;
+import org.apache.flink.types.Row;
+import org.apache.flink.util.Collector;
+import org.apache.flink.util.Preconditions;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.apache.flink.ml.classification.knn.KnnUtil.findColIndex;
+import static org.apache.flink.ml.classification.knn.KnnUtil.findColIndices;
+import static org.apache.flink.ml.classification.knn.KnnUtil.merge;
+import static org.apache.flink.ml.classification.knn.KnnUtil.pGson;
+
+/**
+ * KNN classifier is to classify unlabeled observations by assigning them to
the class of the most
Review comment:
OK. I will update the comment.
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