Github user greghogan commented on a diff in the pull request:
https://github.com/apache/flink/pull/2885#discussion_r102994673
--- Diff:
flink-examples/flink-examples-batch/src/main/java/org/apache/flink/examples/java/ap/AffinityPropagationBulk.java
---
@@ -0,0 +1,449 @@
+/*
+ * 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.examples.java.ap;
+
+import org.apache.flink.api.common.aggregators.ConvergenceCriterion;
+import org.apache.flink.api.common.aggregators.LongSumAggregator;
+import org.apache.flink.api.common.functions.FilterFunction;
+import org.apache.flink.api.common.functions.GroupReduceFunction;
+import org.apache.flink.api.common.functions.JoinFunction;
+import org.apache.flink.api.common.functions.MapFunction;
+import org.apache.flink.api.common.functions.RichJoinFunction;
+import org.apache.flink.api.common.operators.Order;
+import org.apache.flink.api.java.DataSet;
+import org.apache.flink.api.java.ExecutionEnvironment;
+import org.apache.flink.api.java.operators.IterativeDataSet;
+import org.apache.flink.api.java.tuple.Tuple3;
+import org.apache.flink.api.java.tuple.Tuple4;
+import org.apache.flink.examples.java.ap.util.AffinityPropagationData;
+import org.apache.flink.types.DoubleValue;
+import org.apache.flink.types.LongValue;
+import org.apache.flink.util.Collector;
+import
org.apache.flink.api.java.functions.FunctionAnnotation.ForwardedFieldsFirst;
+import
org.apache.flink.api.java.functions.FunctionAnnotation.ForwardedFieldsSecond;
+import
org.apache.flink.api.java.functions.FunctionAnnotation.ForwardedFields;
+
+/**
+ * Created by joseprubio on 9/22/16.
+ */
+
+public class AffinityPropagationBulk {
+
+ private static final double DAMPING_FACTOR = 0.9;
+ private static final double CONVERGENCE_THRESHOLD = 0.12;
+ private static final String CONVERGENCE_MESSAGES = "message
convergence";
+
+ public static void main(String[] args) throws Exception {
+
+ ExecutionEnvironment env =
ExecutionEnvironment.getExecutionEnvironment();
+ env.getConfig().enableObjectReuse();
+
+ // Get input similarities Tuple3<src, target, similarity>
+ DataSet<Tuple3<LongValue, LongValue, DoubleValue>> similarities
=
+ AffinityPropagationData.getTuplesFromFile(env);
+
+ // Init input to iteration
+ DataSet<Tuple4<LongValue, LongValue, DoubleValue, DoubleValue>>
initMessages
+ = similarities.map(new InitMessage());
+
+ // Iterate
+ IterativeDataSet<Tuple4<LongValue, LongValue, DoubleValue,
DoubleValue>> messages
+ = initMessages.iterate(20);
+
+ // Create aggregator
+
messages.registerAggregationConvergenceCriterion(CONVERGENCE_MESSAGES, new
LongSumAggregator(),
+ new MessageConvergence(similarities.count() * 2));
+
+ // Start responsibility message calculation
+ // r(i,k) <- s(i,k) - max {a(i,K) + s(i,K)} st K != k
+ // Iterate over Tuple6 <Source, Target, Responsibility ,
Availability, IsExemplar, ConvergenceCounter>
+
+ DataSet<Tuple3<LongValue, LongValue, DoubleValue>>
responsibilities = similarities
+
+ // Get a list of a(i,K) + s(i,K) values joining
similarities with messages
+
.join(messages).where("f0","f1").equalTo("f0","f1").with(new
joinAvailabilitySimilarity())
+
+ // Get a dataset with 2 higher values
+ .groupBy("f1").sortGroup("f2",
Order.DESCENDING).first(2)
+
+ // Create a Tuple4<Trg, MaxValue, MaxNeighbour,
SecondMaxValue> reducing the 2 tuples with higher values
+ .groupBy("f1").reduceGroup(new
responsibilityReduceGroup())
+
+ // Calculate the R messages "r(i,k) <- s(i,k) - value"
getting "value" joining
+ // similarities with previous tuple
+
.leftOuterJoin(similarities).where("f0").equalTo("f1").with(new
responsibilityValue())
+
+ // Responsibility damping
+
.join(messages).where("f0","f1").equalTo("f1","f0").with(new
dampedRValue(DAMPING_FACTOR, CONVERGENCE_THRESHOLD));
+
+ // Start availability message calculation
+ // a(i,k) <- min {0, r(k,k) + sum{max{0,r(I,k)}} I st I not in
{i,k}
+ // a(k,k) <- sum{max{0,r(I,k)} I st I not in {i,k}
+
+ DataSet<Tuple4<LongValue, LongValue, DoubleValue, DoubleValue>>
availabilities = responsibilities
+
+ // Get the sum of the positive responsibilities and the
self responsibility per target
+ .groupBy("f1").reduceGroup(new
availabilityReduceGroup())
+
+ // Calculate the availability
+
.leftOuterJoin(responsibilities).where("f0").equalTo("f1").with(new
availabilityValue())
+
+ // Availability damping
+
.join(messages).where("f0","f1").equalTo("f0","f1").with(new
dampedAValue(DAMPING_FACTOR, CONVERGENCE_THRESHOLD));
+
+ // End iteration
+ DataSet<Tuple4<LongValue, LongValue, DoubleValue, DoubleValue>>
finalMessages =
+ messages.closeWith(availabilities);
+
+ // Get exemplars
+ DataSet<Tuple4<LongValue, LongValue, DoubleValue, DoubleValue>>
+ exemplars = finalMessages.filter(new FilterExemplars());
+
+ // Get clusters
+ DataSet<Tuple3<LongValue, LongValue, DoubleValue>> clusters =
exemplars
+
.join(similarities).where("f0").equalTo("f1").projectSecond(0,1,2);
+
+ // Refine clusters assigning exemplars to themselves
+ DataSet<Tuple3<LongValue, LongValue, DoubleValue>>
refinedClusters = clusters
+ .groupBy("f0").maxBy(2)
+
.leftOuterJoin(exemplars).where("f0").equalTo("f0").with(new refineClusters());
+
+ }
+
+ // Init input messages
+ private static class InitMessage implements
MapFunction<Tuple3<LongValue, LongValue, DoubleValue>,
+ Tuple4<LongValue, LongValue, DoubleValue, DoubleValue>> {
--- End diff --
I find it easier to read when `implements` is just below and aligned with
`private`.
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