TitanGraph vertex_sample

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vertex_sample(self, size, sample_type, seed=None)

Make subgraph from vertex sampling.

Parameters:

size : int32

The number of vertices to sample from the graph.

sample_type : unicode

The type of vertex sample among: [‘uniform’, ‘degree’, ‘degreedist’].

seed : int64 (default=None)

Random seed value.

Returns:

: dict

A new Graph object representing the vertex induced subgraph.

Create a vertex induced subgraph obtained by vertex sampling. Three types of vertex sampling are provided: ‘uniform’, ‘degree’, and ‘degreedist’. A ‘uniform’ vertex sample is obtained by sampling vertices uniformly at random. For ‘degree’ vertex sampling, each vertex is weighted by its out-degree. For ‘degreedist’ vertex sampling, each vertex is weighted by the total number of vertices that have the same out-degree as it. That is, the weight applied to each vertex for ‘degreedist’ vertex sampling is given by the out-degree histogram bin size.