Github user chobeat commented on a diff in the pull request:
https://github.com/apache/flink/pull/1996#discussion_r65065451
--- Diff:
flink-libraries/flink-ml/src/main/scala/org/apache/flink/ml/math/distributed/DistributedRowMatrix.scala
---
@@ -0,0 +1,167 @@
+/*
+ * 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.math.distributed
+
+import java.lang
+
+import breeze.linalg.{CSCMatrix => BreezeSparseMatrix, Matrix =>
BreezeMatrix, Vector => BreezeVector}
+import org.apache.flink.api.common.functions.RichGroupReduceFunction
+import org.apache.flink.api.common.typeinfo.TypeInformation
+import org.apache.flink.api.scala._
+import org.apache.flink.ml.math.{Matrix => FlinkMatrix, _}
+import org.apache.flink.util.Collector
+import org.apache.flink.ml.math.Breeze._
+import scala.collection.JavaConversions._
+
+/**
+ *
+ * @param numRowsOpt If None, will be calculated from the DataSet.
+ * @param numColsOpt If None, will be calculated from the DataSet.
+ */
+class DistributedRowMatrix(data: DataSet[IndexedRow],
+ numRowsOpt: Option[Int] = None,
+ numColsOpt: Option[Int] = None)
+ extends DistributedMatrix {
+
+ lazy val getNumRows: Int = numRowsOpt match {
+ case Some(rows) => rows
+ case None => data.count().toInt
+ }
+
+ lazy val getNumCols: Int = numColsOpt match {
+ case Some(cols) => cols
+ case None => calcCols
+ }
+
+ val getRowData = data
+
+ private def calcCols: Int =
+ data.first(1).collect().headOption match {
+ case Some(vector) => vector.values.size
+ case None => 0
+ }
+
+ /**
+ * Collects the data in the form of a sequence of coordinates
associated with their values.
+ * @return
+ */
+ def toCOO: Seq[(Int, Int, Double)] = {
+
+ val localRows = data.collect()
+
+ for (IndexedRow(rowIndex, vector) <- localRows;
+ (columnIndex, value) <- vector) yield (rowIndex, columnIndex, value)
+ }
+
+ /**
+ * Collects the data in the form of a SparseMatrix
+ * @return
+ */
+ def toLocalSparseMatrix: SparseMatrix = {
+ val localMatrix = SparseMatrix.fromCOO(this.getNumRows,
this.getNumCols, this.toCOO)
+ require(localMatrix.numRows == this.getNumRows)
+ require(localMatrix.numCols == this.getNumCols)
+ localMatrix
+ }
+
+ //TODO: convert to dense representation on the distributed matrix and
collect it afterward
+ def toLocalDenseMatrix: DenseMatrix =
this.toLocalSparseMatrix.toDenseMatrix
+
+ def byRowOperation(
+ fun: (Vector, Vector) => Vector, other: DistributedRowMatrix):
DistributedRowMatrix = {
+ val otherData = other.getRowData
+ require(this.getNumCols == other.getNumCols)
+ require(this.getNumRows == other.getNumRows)
+
+ val ev1: TypeInformation[Int] = TypeInformation.of(classOf[Int])
+
+ val result = this.data
+ .fullOuterJoin(otherData)
+ .where(_.rowIndex)
+ .equalTo(_.rowIndex)(ev1)(
--- End diff --
Good to know. I will have to fix this in the other PR too because I used it
a lot. Thanks.
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