Obtaining Graphchi_vertex By Vertex.id

[erzhuo wang]

Anyone knows given the vertex id, how I can get the vertex data?

For example at each update procedure, I know the current the vertex and the edges connected to this vertex. Then how I can retrieve the data stored in the vertices on the other end of these edges?

thx

[Haijie Gu]

Hi Erzhuo,

Sorry for the delayed response. The simplest way to get the data is to store all the vertex data in an array and use vertex_id to reference to the data. ALS is a good example and here's the code in GraphChi-java:

https://code.google.com/p/graphchi-java/source/browse/src/main/java/edu/cmu/graphchi/apps/ALSMatrixFactorization.java

If you are using GraphChi C++, the v2.1API allows you to get a vertex object at the end of the edge. 

https://code.google.com/p/graphchi/source/browse/src/api/graphlab2_1_GAS_api/graphchi_graphlabv2_1.hpp

Here's the ALS example which demonstrates the feature you want:

https://code.google.com/p/graphchi/source/browse/example_apps/matrix_factorization/graphlab_gas/als_vertex_program.hpp

Best,

-jay

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