Table 1 Notations and explanations

\(u_{i}^{A}\)

Ranking score of developer i in layer A

\(p_{j}^{A}\)

Ranking score of project j in layer A

W^A

Weight matrix of layer A, its element \(w_{ij}^{A}\) represents the edge weight

between developer i and project j in layer A

γ,λ

Hyperparameters

\(u_{i}^{0}, p_{j}^{0}\)

Query vectors for developer i and project j

θ

Threshold for SIR simulation

|U^A|,|P^A|

Numbers of developers and projects in layer A

\(d_{i}^{A}, d_{j}^{A}\)

Degrees of developer i and project j in layer A

S^A

Symmetric normalization of weight matrix W^A