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https://issues.apache.org/jira/browse/MAHOUT-1596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14069050#comment-14069050
]
ASF GitHub Bot commented on MAHOUT-1596:
----------------------------------------
Github user dlyubimov commented on a diff in the pull request:
https://github.com/apache/mahout/pull/30#discussion_r15188440
--- Diff:
spark/src/main/scala/org/apache/mahout/sparkbindings/blas/RbindAB.scala ---
@@ -0,0 +1,77 @@
+/*
+ * 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.mahout.sparkbindings.blas
+
+import org.apache.log4j.Logger
+import scala.reflect.ClassTag
+import org.apache.mahout.sparkbindings.drm.DrmRddInput
+import org.apache.mahout.math._
+import scalabindings._
+import RLikeOps._
+import org.apache.mahout.math.drm.logical.OpRbind
+import org.apache.spark.SparkContext._
+
+/** Physical Rbind */
+object RbindAB {
+
+ private val log = Logger.getLogger(RbindAB.getClass)
+
+ def rbindAB_int[K:ClassTag](op: OpRbind[K], srcA: DrmRddInput[K], srcB:
DrmRddInput[K]): DrmRddInput[K] = {
+
+ val a = srcA.asInstanceOf[DrmRddInput[Int]].toDrmRdd()
+ val b = srcB.asInstanceOf[DrmRddInput[Int]].toDrmRdd()
+ val n1 = op.A.nrow.asInstanceOf[Int]
+
+ val rdd = a union (b map({ case (key, vec) => ((key + n1), vec) }))
--- End diff --
hm. i wonder if we can just insert mapBlock() operator at logical layer to
handle key mutations here on one of the operands and have same semantics
(concatenate partitions) at the physical layer.
Generally, if we can handle a problem at logical level, we always should
try to do that, since it minimizes the back-side problem.
> support for rbind() operator on DRMs
> ------------------------------------
>
> Key: MAHOUT-1596
> URL: https://issues.apache.org/jira/browse/MAHOUT-1596
> Project: Mahout
> Issue Type: Bug
> Reporter: Anand Avati
>
> an R like operator, cbind(), for appending rows of second matrix below the
> rows of first matrix to create a new matrix.
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