mirror of https://gitee.com/bigwinds/arangodb
67 lines
2.4 KiB
C++
67 lines
2.4 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2016 ArangoDB GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Simon Grätzer
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_PREGEL_ALGOS_LINERANK_H
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#define ARANGODB_PREGEL_ALGOS_LINERANK_H 1
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#include <velocypack/Slice.h>
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#include "Pregel/Algorithm.h"
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namespace arangodb {
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namespace pregel {
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namespace algos {
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/// LineRank from "Centralities in Large Networks: Algorithms and Observations"
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/// 2011:
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/// Given a directed graph G, the LINERANK score of a node v ∈ G is computed by
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/// aggregating the stationary probabilities of its incident edges on the line
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/// graph L(G).
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/// Implementation based on
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/// github.com/JananiC/NetworkCentralities/blob/master/src/main/java/linerank/LineRank.java
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struct LineRank : public SimpleAlgorithm<float, float, float> {
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public:
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explicit LineRank(application_features::ApplicationServer& server,
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arangodb::velocypack::Slice params);
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GraphFormat<float, float>* inputFormat() const override {
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return new VertexGraphFormat<float, float>(_server, _resultField, 0);
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}
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MessageFormat<float>* messageFormat() const override {
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return new NumberMessageFormat<float>();
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}
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MessageCombiner<float>* messageCombiner() const override {
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return new SumCombiner<float>();
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}
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WorkerContext* workerContext(velocypack::Slice params) const override;
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MasterContext* masterContext(velocypack::Slice) const override;
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VertexComputation<float, float, float>* createComputation(WorkerConfig const*) const override;
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IAggregator* aggregator(std::string const& name) const override;
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};
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} // namespace algos
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} // namespace pregel
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} // namespace arangodb
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#endif
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