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README.md

PASSCoDe-fix

PASSCoDe-fix is based on the PASSCoDe (Parallel ASynchronous Stochastic dual Co-ordinate Descent) algorithm, and we aim to fix the divergence problem of PASSCoDe in highly parallel situations. Please note that the current version only supports binary classification (with label +1 and -1), and only implemented limited dual solvers in the LIBLINEAR (see Usage below). For more details about this algorithm please refer to the following papers:

Fixing the Convergence Problems in Parallel Asynchronous Dual Coordinate Descent,
Huan Zhang and Cho-Jui Hsieh, 2016. 

PASSCoDe: Parallel ASynchronous Stochastic dual Co-ordinate Descent, 
C.-J. Hsieh, H.-F. Yu, and I. S. Dhillon, 2015. 

Build

We require the following environment to build PASSCoDe-fix:

  • GNU Compiler Collection (GCC) 4.7.1 or newer versions, with C++11 and OpenMP support
  • Unix Systems (If you are in Mac OS, please install GCC instead of the LLVM compiler shipped with the Xcode command line tools.)

To build the program, simply run make. Two binaries, train (for training without shrinking) and train-shrink (for training with shrinking) will be built. In the PASSCoDe-fix paper, we did not use shrinking in our experiments and analysis.

Data Preparation

Please download the datasets from LIBSVM datasets http://www.csie.ntu.edu.tw/~cjlin/libsvmtools/datasets/binary.html and convert them to the binary format used for PASSCoDe-fix.

./convert2binary training_set_file [training_binary]

You can also use LIBSVM format directly by adding the argument "-b 0". However data loading will be slower.

We have prepared binary files used in the experiments of our paper. You can download these datasets here:

http://jaina.cs.ucdavis.edu/datasets/classification_compressed/

You only need to download .cbin.xz files. To save downloading time these files are compressed. Please decompress them using the xz utility before use.

Usage

The new solvers added in this version are PASSCoDe-Atomic-fix and PASSCoDe-Wild-fix for L1-loss and L2-loss support vector classifications. They can be invoked by set the type of solver to 55, 57, 35 and 37, respectively. Please note that in our paper only ATOMIC-fix based algorithms are analyzed, however Wild-fix might give you best performance for certain datasets.

./train[-shink] [options] training_set_file test_set_file
options:
-s type : set type of solver (default 31)
	31 -- L2-regularized L2-loss support vector classification PASSCoDe-Wild (dual)
	33 -- L2-regularized L1-loss support vector classification PASSCoDe-Wild (dual)
	35 -- L2-regularized L2-loss support vector classification PASSCoDe-Wild-fix (dual)
	37 -- L2-regularized L1-loss support vector classification PASSCoDe-Wild-fix (dual)
	41 -- L2-regularized L2-loss support vector classification PASSCoDe-LOCK (dual)
	43 -- L2-regularized L1-loss support vector classification PASSCoDe-LOCK (dual)
	51 -- L2-regularized L2-loss support vector classification PASSCoDe-ATOMIC (dual)
	53 -- L2-regularized L1-loss support vector classification PASSCoDe-ATOMIC (dual)
	55 -- L2-regularized L2-loss support vector classification PASSCoDe-ATOMIC-fix (dual)
	57 -- L2-regularized L1-loss support vector classification PASSCoDe-ATOMIC-fix (dual)
	61 -- L2-regularized L2-loss support vector classification CoCoA (dual)
	63 -- L2-regularized L1-loss support vector classification CoCoA (dual)
	71 -- L2-regularized L2-loss support vector classification ASCD (dual)
	73 -- L2-regularized L1-loss support vector classification ASCD (dual)
-c cost : set the parameter C (default 1)
-n nr_threads : the number of threads
-t max_iterations: the max number of iterations (default 100)
-e epsilon : set tolerance of termination criterion
-b binary_mode : if binary_mode = 1, read binary format (default 1)

Additional Information

If your have any questions or comments, please open an issue on Github, or send an email to ecezhang@ucdavis.edu. We appreciate your feedback.

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Fixing convergence problems in Parallel ASynchronous Stochastic dual Co-ordinate Descent (PASSCoDe)

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