Community bonding experience.

Hi all!

The community bonding period is over. I tried to start with understanding those source codes which have implemented the same class of algorithms that I am hoping to implement over the GSoC timeline.

For me, it is Approximate inference of Probabilistic Graphic Models. OpenGM is one of the best C++ template library for discrete factor graph models and distributive operations on these models. It includes state-of-the-art optimization and inference algorithms beyond message passing.

The method that I intend to implement is basically a message passing algorithm. It is called Max-product Linear Programming(MPLP) approx. inference. It was first proposed by Amir Globerson and Tommi Jaakkola in the paper “Fixing max-product: Convergent message passing algorithms for MAP LP-Relaxation” in the year 2007.

I figured it out that this is going to be the 1st phase of my implementation.

The whole of my timeline consists of implementing 2 more subsequent papers which are very much written in hierarchy to this one. So, I have been thinking that if this one is implemented correctly and efficiently, then extending the code for the other 2 papers will be easy.

The other 2 subsequent papers are:

So as far as the community bonding period is concerned, my learning curve was right up. I read all the 3 papers and tried to grasp the concepts of PGM’s. It came out to be not so easy and I had to fall back.

I started understanding PGM’s from the basics by skimming past the introductory videos on PGM from Coursera by Daphne Koller. After going over them, I tried for another read of the papers. I am now able to figure the objective quite well than the last time.

From the last GSoC experience, I am very much sure that understanding is very much important before coding. I just hope I get to understand the gist of the papers and implement them well.


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