15. The system of claim 1 , wherein iteratively computing a respective final score for each entity comprises: precomputing U(i)=1/|N(i)| and V(j)=1/|N(j)|; distributing U(i) and V(j) values on multiple worker nodes, wherein the multiple worker nodes are partitioned by i values for U(i) and by j values for V(j); iteratively computing new score values x t+1 and y t+1 according to: 
 x t+1 ( i )=alpha×(Σ j∈N(i) V ( j )× y t ( j ))+ x 0 ( i ) and 
 y t+1 ( j )=beta×(Σ i∈N(j) U ( i )× x t ( i ))+ y 0 ( j ); wherein: x t (i) represents a score for a first entity i at a t+1 th iterative step; y t (i) represents a score for a second entity j at a t+1 th iterative step; alpha and beta are propagation constants; N(p) represents a set of all nodes in the bipartite graph that share an edge with vertex p; W(s,t) represents an aggregate weight of the edge in the bipartite graph between nodes s and t; x 0 (i) represents an initial score for the first entity i; and y 0 (j) represents an initial score for the second entity j.
15. The system of claim 1 , wherein iteratively computing a respective final score for each entity comprises: precomputing U(i)=1/|N(i)| and V(j)=1/|N(j)|; distributing U(i) and V(j) values on multiple worker nodes, wherein the multiple worker nodes are partitioned by i values for U(i) and by j values for V(j); iteratively computing new score values x t+1 and y t+1 according to: 
 x t+1 ( i )=alpha×(Σ j∈N(i) V ( j )× y t ( j ))+ x 0 ( i ) and 
 y t+1 ( j )=beta×(Σ i∈N(j) U ( i )× x t ( i ))+ y 0 ( j ); wherein: x t (i) represents a score for a first entity i at a t+1 th iterative step; y t (i) represents a score for a second entity j at a t+1 th iterative step; alpha and beta are propagation constants; N(p) represents a set of all nodes in the bipartite graph that share an edge with vertex p; W(s,t) represents an aggregate weight of the edge in the bipartite graph between nodes s and t; x 0 (i) represents an initial score for the first entity i; and y 0 (j) represents an initial score for the second entity j. 16. The system of claim 15 , wherein: alpha and beta have different values, the higher value indicating a greater degree of trust in the initial scores of the respective first entities and the second entities.