PageRank
Parameter |
Mandatory |
Type |
Description |
|---|---|---|---|
alpha |
No |
Double |
Weight coefficient (also called damping coefficient) The value range is between 0 and 1, excluding 0 and 1. The default value is 0.85. |
convergence |
No |
Double |
Convergence The value range is between 0 and 1, excluding 0 and 1. The default value is 0.00001. |
max_iterations |
No |
Integer |
Maximum iterations An integer ranging from 1 to 2147483647. For frontend calls, the range is [1,2000]. The default value is 1000. |
num_thread |
No |
Integer |
Number of concurrent threads. The value ranges from 1 to 40. If the value is less than 1, it is automatically set to 1. If the value is greater than 40, it is automatically set to 40. The default value is 4. |
directed |
No |
Boolean |
Whether to consider the edge direction. The value can be true or false. The default value is true. |
Iterations and convergence
The algorithm is terminated when either the maximum number of iterations is reached or the convergence precision is met.
- Generally, a smaller convergence precision and larger number of iterations lead to a better effect of the algorithm.
- To meet a certain convergence precision, you should set the number of iterations as large as possible.
- A larger number of iterations means a longer algorithm running time. To ensure that the algorithm runs at a certain number of iterations (that is, in a fixed duration), you should set the convergence precision as small as possible.
Parameter |
Type |
Description |
|---|---|---|
pagerank |
List |
PageRank value of each vertex. The format is as follows: [{vertexId:rankValue},...], where vertexId is of the string type. rankValue is of the double type. |
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