Gephi forums

The source code of PFA is available in the file cudaForceAtlas.cu that you can get there: https://github.com/paulantoineb/hpcgrap ... cGraphCuda

Clement is right: Force Atlas 2 is faster than Parallel Force Atlas (CPU or GPU) except for graphs of less than around 5000 nodes (due to the overhead of the Barnes Hut implementation). I have attached a graph of a benchmark that I have done to compare the performance of PFA with FA and FA2 that sho...

There is no convergence check at the end of each iteration of PFA. It is up to the user to stop the layout when satisfied with the result. If your graphs are small enough, the layout will stabilize itself quite quickly. If after running the layout for a while some nodes keep moving around from one p...

Hi guys, Sorry Martin for not responding earlier, I recently moved to the UK for a new job and I haven't had much time to check the forum. The checkbox unchecks itself when the plug-in is unable to load the libraries used for computation. I have done some testing and it appears that you don't only n...

These files use semicolons as separators. You need to select "Semicolon" instead of "Comma" on the Import Spreadsheet window.

Hi Urban, The source code of the CPU implementation of Parallel Force Atlas is in the following file: http://bazaar.launchpad.net/~pbittner/gephi/parallelLayouts/view/head:/ParallelForceAtlas/src/org/gephi/parallelForceAtlas/optimization/ParallelLayoutUtils.f90 The repulsion stage of the force atlas...

Thank you very much for trying Clement. I observe the same behavior (nodes converging to the center) on the oldest graphic card I have tried. It is due to the CUDA kernel failing to launch when there are not enough resources available (memory, registers...). However, your graphic card is very recent...

The plug-in has just been updated and includes a CUDA implementation of the layout running on GPUs. :) If some of you have Windows 64 bit and a CUDA compatible Nvidia graphic card, I would appreciate some feedback since portability between different generations of Nvidia cards is a bit tricky. I hav...

I had a look at your dataset and the "rogue node" seems to come from the empty line between "s33,19432" and "edgedef>node1 VARCHAR,node2 VARCHAR,label VARCHAR". By removing that empty line, the nodes are loaded just fine.

I'm glad that you like it :) Over the week-end, I wrote a prototype of Force Atlas using CUDA that is even faster (~10x). On my laptop with a mid-range GPU card, one iteration of the layout is taking 0.1s with 20,000 nodes and 2s with 100,000 nodes. I will include it in the next version of the plugi...