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Josep Rubió commented on FLINK1707:

Hi all,
Sorry for my late response but I did not have much time to work with this.
I have created a spreadsheet executing the algorithm with the same example i have in github.
This is a 3 nodes graph with following similarities:
1 > 1: 1.0
1 > 2: 1.0
1 > 3: 5.0
2 > 1: 1.0
2 > 2: 1.0
2 > 3: 3.0
3 > 1: 5.0
3 > 2: 3.0
3 > 3: 1.0
The execution in the spreadsheet contains the calculations for intermediate results of the
algorithm (eta and beta values being n and b respectively). These calculations are implicit
in in alfa and rho in the implementation.
You can see that values for Rho messages in the spreadsheet are the values sent from I to
E nodes in the implementation and alfa messages are the values sent from E to I nodes.
Damping factor can be set at second row.
https://docs.google.com/spreadsheets/d/1CurZCBP6dPb1IYQQIgUHVjQdyLxK0JDGZwlSXCzBcvA/edit?usp=sharing
About the other issues:
 Although It is recommended in the paper to use damping it can be implemented without it,
avoiding having in the vertices the old sent values for each destination. I don't see any
other way to implement damping.
 Calculating values in parallel is not an issue is a different scheduling of the algorithm.
It could be done in a serial mode just doing the calculations for odd or even vertices in
each superstep.
 I will review the other implementation issues you commented
Thanks!
> Add an Affinity Propagation Library Method
> 
>
> Key: FLINK1707
> URL: https://issues.apache.org/jira/browse/FLINK1707
> Project: Flink
> Issue Type: New Feature
> Components: Gelly
> Reporter: Vasia Kalavri
> Assignee: Josep Rubió
> Priority: Minor
> Labels: requiresdesigndoc
> Attachments: Binary_Affinity_Propagation_in_Flink_design_doc.pdf
>
>
> This issue proposes adding the an implementation of the Affinity Propagation algorithm
as a Gelly library method and a corresponding example.
> The algorithm is described in paper [1] and a description of a vertexcentric implementation
can be found is [2].
> [1]: http://www.psi.toronto.edu/affinitypropagation/FreyDueckScience07.pdf
> [2]: http://event.cwi.nl/grades2014/00chingslides.pdf
> Design doc:
> https://docs.google.com/document/d/1QULalzPqMVICi8jRVs3S0n39pell2ZVc7RNemz_SGA4/edit?usp=sharing
> Example spreadsheet:
> https://docs.google.com/spreadsheets/d/1CurZCBP6dPb1IYQQIgUHVjQdyLxK0JDGZwlSXCzBcvA/edit?usp=sharing

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