Network Embedding For Link Prediction in Bipartite Networks

Öz

Many social networks have a bipartite nature. Link prediction in social networks has been the focus of interest for many researchers recently. Network embedding, which maps each node in the network to a low-dimensional feature vector is used to solve many problems. The aim of this study is to investigate how network embedding enhance the link prediction performance in bipartite networks. A network embedding and a supervised learning based link prediction model has been presented for bipartite networks. The input of the supervised learning model is learned embedding vectors of node pairs obtained from network embedding method. The target feature of prediction is a binary label indicating the existence or absence of a link between these node pairs. Ensemble learning algorithms have been applied for supervised link prediction. The experiments performed on two bipartite social networks built from public datasets led promising results with 0.939 and 0.974 AUC values. Random Forest models trained with embedding vectors obtained from BiNE method achieved the highest performances.

Anahtar Kelimeler

• Network embedding
• node2vec
• BiNE
• Link prediction
• Bipartite network
• Ensemble learning

İki Parçalı Ağlarda Bağlantı Tahmini için Çizge Gömme

Öz

Birçok sosyal ağ doğası gereği iki parçalı yapıdadır. Sosyal ağlarda bağlantı tahmini, son zamanlarda birçok araştırmacının ilgi odağı olmuştur. Ağdaki her düğümü düşük boyutlu bir özellik vektörüne eşleyen ağ gömme islemi birçok problemin çözümü için kullanılmaktadır. Bu çalışma, çizge (ağ) gömme yöntemlerinin iki parçalı ağlarda makine öğrenimi tabanlı bağlantı tahmin modelinin performansını nasıl iyileştirdiğini incelemeyi amaçlamaktadır. Makine öğrenme modelinin girdisi, düğüm çiftlerinin çizge gömme yönteminden elde edilen öğrenilmiş gömme vektörleridir. Tahminleme işleminin hedef özniteliği, bu düğüm çiftleri arasında bir bağlantının varlığını veya yokluğunu gösteren ikili bir etikettir. Gözetimli bağlantı tahmini için topluluk öğrenme algoritmaları uygulanmıştır. Herkese açık veri kümelerinden oluşturulan iki parçalı iki sosyal ağ üzerinde gerçekleştirilen deneyler, 0.939 ve 0.974 AUC değerleriyle umut verici sonuçlara ulaşmıştır. BiNE yönteminden elde edilen gömme vektörleri ile eğitilen Random Forest modelleri en yüksek performansları elde etmiştir.

Anahtar Kelimeler

• Çizge gömme
• node2vec
• BiNE
• Bağlantı tahmini
• İki parçalı ağ
• Topluluk öğrenmesi

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