[GitHub] [flink] c4emmmm commented on a change in pull request #8631: [FLINK-12745][ml] add sparse and dense vector class, and dense matrix class with basic operations.

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c4emmmm commented on a change in pull request #8631: [FLINK-12745][ml] add sparse and dense vector class, and dense matrix class with basic operations.
URL: https://github.com/apache/flink/pull/8631#discussion_r310870925
 
 

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 File path: flink-ml-parent/flink-ml-lib/src/main/java/org/apache/flink/ml/common/matrix/DenseMatrix.java
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 @@ -0,0 +1,763 @@
+/*
+ * 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.common.matrix;
+
+import java.io.Serializable;
+import java.util.Arrays;
+
+/**
+ * DenseMatrix stores dense matrix data and provides some methods to operate on
+ * the matrix it represents.
+ */
+public class DenseMatrix implements Serializable {
+
+	/**
+	 * Row dimension.
+	 */
+	private int m;
 
 Review comment:
   I suppose it's more like the naming in linear algebra, where we typically say a "m*n" matrix. Since this class is more for algorithm developers who may be more familiar to mathematic, I think the naming is ok.

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