VwEnvironment.cpp

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00001 /*
00002  * Copyright (c) 2009 Yahoo! Inc.  All rights reserved.  The copyrights
00003  * embodied in the content of this file are licensed under the BSD
00004  * (revised) open source license.
00005  *
00006  * This program is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU General Public License as published by
00008  * the Free Software Foundation; either version 3 of the License, or
00009  * (at your option) any later version.
00010  *
00011  * Written (W) 2011 Shashwat Lal Das
00012  * Copyright (C) 2011 Berlin Institute of Technology and Max-Planck-Society.
00013  */
00014 
00015 #include <shogun/classifier/vw/VwEnvironment.h>
00016 
00017 using namespace shogun;
00018 
00019 CVwEnvironment::CVwEnvironment()
00020     : CSGObject(), vw_version("5.1"), v_length(4)
00021 {
00022     init();
00023 }
00024 
00025 void CVwEnvironment::init()
00026 {
00027     num_bits = 18;
00028     thread_bits = 0;
00029     mask = (1 << num_bits) - 1;
00030     stride = 1;
00031 
00032     min_label = 0.;
00033     max_label = 1.;
00034 
00035     eta = 10.;
00036     eta_decay_rate = 1.;
00037 
00038     adaptive = false;
00039     exact_adaptive_norm = false;
00040     l1_regularization = 0.;
00041 
00042     random_weights = false;
00043     initial_weight = 0.;
00044 
00045     update_sum = 0.;
00046 
00047     t = 1.;
00048     initial_t = 1.;
00049     power_t = 0.5;
00050 
00051     example_number = 0;
00052     weighted_examples = 0.;
00053     weighted_unlabeled_examples = 0.;
00054     weighted_labels = 0.;
00055     total_features = 0;
00056     sum_loss = 0.;
00057     passes_complete = 0;
00058     num_passes = 1;
00059 
00060     ngram = 0;
00061     skips = 0;
00062 
00063     ignore_some = false;
00064 
00065     vw_size_t len = ((vw_size_t) 1) << num_bits;
00066     thread_mask = (stride * (len >> thread_bits)) - 1;
00067 }
00068 
00069 void CVwEnvironment::set_stride(vw_size_t new_stride)
00070 {
00071     stride = new_stride;
00072     vw_size_t len = ((vw_size_t) 1) << num_bits;
00073     thread_mask = (stride * (len >> thread_bits)) - 1;
00074 }
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