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https://issues.apache.org/jira/browse/MAHOUT-1500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14097930#comment-14097930
]
ASF GitHub Bot commented on MAHOUT-1500:
----------------------------------------
Github user andrewpalumbo commented on a diff in the pull request:
https://github.com/apache/mahout/pull/21#discussion_r16274324
--- Diff: h2o/src/main/java/org/apache/mahout/h2obindings/drm/H2OBCast.java
---
@@ -0,0 +1,93 @@
+/*
+ * 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.h2obindings.drm;
+
+import org.apache.mahout.math.drm.BCast;
+import org.apache.mahout.math.Matrix;
+import org.apache.mahout.math.Vector;
+import org.apache.mahout.math.MatrixWritable;
+import org.apache.mahout.math.VectorWritable;
+
+import org.apache.hadoop.io.Writable;
+
+import java.io.Serializable;
+import java.io.ByteArrayOutputStream;
+import java.io.ByteArrayInputStream;
+import java.io.ObjectOutputStream;
+import java.io.ObjectInputStream;
+
+/* Handle Matrix and Vector separately so that we can live with
+ just importing MatrixWritable and VectorWritable.
+*/
+
+public class H2OBCast<T> implements BCast<T>, Serializable {
+ transient T obj;
+ byte buf[];
+ boolean is_matrix;
+
+ public H2OBCast(T o) {
+ obj = o;
+
+ if (o instanceof Matrix) {
+ buf = serialize(new MatrixWritable((Matrix)o));
+ is_matrix = true;
+ } else if (o instanceof Vector) {
+ buf = serialize(new VectorWritable((Vector)o));
+ } else {
+ throw new IllegalArgumentException("Only Matrix or Vector supported
for now");
+ }
+ }
+
+ public T value() {
+ if (obj == null)
+ obj = deserialize(buf);
+ return obj;
+ }
+
+ private byte[] serialize(Writable w) {
+ ByteArrayOutputStream bos = new ByteArrayOutputStream();
+ try {
+ ObjectOutputStream oos = new ObjectOutputStream(bos);
+ w.write(oos);
+ oos.close();
+ } catch (java.io.IOException e) {
+ return null;
+ }
+ return bos.toByteArray();
+ }
+
+ private T deserialize(byte buf[]) {
+ T ret = null;
+ ByteArrayInputStream bis = new ByteArrayInputStream(buf);
+ try {
+ ObjectInputStream ois = new ObjectInputStream(bis);
+ if (is_matrix) {
+ MatrixWritable w = new MatrixWritable();
+ w.readFields(ois);
+ ret = (T) w.get();
+ } else {
+ VectorWritable w = new VectorWritable();
+ w.readFields(ois);
+ ret = (T) w.get();
+ }
+ } catch (java.io.IOException e) {
+ System.out.println("Caught exception: " + e);
--- End diff --
indentation after catch
> H2O integration
> ---------------
>
> Key: MAHOUT-1500
> URL: https://issues.apache.org/jira/browse/MAHOUT-1500
> Project: Mahout
> Issue Type: Improvement
> Reporter: Anand Avati
> Fix For: 1.0
>
>
> Provide H2O backend for the Mahout DSL
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