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https://issues.apache.org/jira/browse/FLINK-1745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15261839#comment-15261839
]
ASF GitHub Bot commented on FLINK-1745:
---------------------------------------
Github user chiwanpark commented on a diff in the pull request:
https://github.com/apache/flink/pull/1220#discussion_r61397659
--- Diff:
flink-libraries/flink-ml/src/main/scala/org/apache/flink/ml/nn/KNN.scala ---
@@ -0,0 +1,354 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.ml.nn
+
+import org.apache.flink.api.common.operators.Order
+import org.apache.flink.api.common.typeinfo.TypeInformation
+import org.apache.flink.api.scala.utils._
+import org.apache.flink.api.scala._
+import org.apache.flink.ml.common._
+import org.apache.flink.ml.math.{Vector => FlinkVector, DenseVector}
+import
org.apache.flink.ml.metrics.distances.{SquaredEuclideanDistanceMetric,
DistanceMetric,
+EuclideanDistanceMetric}
+import org.apache.flink.ml.pipeline.{FitOperation,
PredictDataSetOperation, Predictor}
+import org.apache.flink.util.Collector
+import
org.apache.flink.api.common.operators.base.CrossOperatorBase.CrossHint
+
+import scala.collection.immutable.Vector
+import scala.collection.mutable
+import scala.collection.mutable.ArrayBuffer
+import scala.reflect.ClassTag
+
+/** Implements a k-nearest neighbor join.
+ *
+ * Calculates the `k` nearest neighbor points in the training set for
each point in the test set.
--- End diff --
Calculates the _`k`-nearest_ neighbor points ...
> Add exact k-nearest-neighbours algorithm to machine learning library
> --------------------------------------------------------------------
>
> Key: FLINK-1745
> URL: https://issues.apache.org/jira/browse/FLINK-1745
> Project: Flink
> Issue Type: New Feature
> Components: Machine Learning Library
> Reporter: Till Rohrmann
> Assignee: Daniel Blazevski
> Labels: ML, Starter
>
> Even though the k-nearest-neighbours (kNN) [1,2] algorithm is quite trivial
> it is still used as a mean to classify data and to do regression. This issue
> focuses on the implementation of an exact kNN (H-BNLJ, H-BRJ) algorithm as
> proposed in [2].
> Could be a starter task.
> Resources:
> [1] [http://en.wikipedia.org/wiki/K-nearest_neighbors_algorithm]
> [2] [https://www.cs.utah.edu/~lifeifei/papers/mrknnj.pdf]
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