core/src/main/java/org/apache/sdap/mudrod/main/MudrodEngine.java [228:234]:
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    DiscoveryEngineAbstract md = new MetadataDiscoveryEngine(props, es, spark);
    md.preprocess();
    md.process();

    DiscoveryEngineAbstract recom = new RecommendEngine(props, es, spark);
    recom.preprocess();
    recom.process();
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core/src/main/java/org/apache/sdap/mudrod/main/MudrodEngine.java [243:249]:
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    DiscoveryEngineAbstract md = new MetadataDiscoveryEngine(props, es, spark);
    md.preprocess();
    md.process();

    DiscoveryEngineAbstract recom = new RecommendEngine(props, es, spark);
    recom.preprocess();
    recom.process();
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