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/*
Copyright (c) 2009 Yahoo! Inc. All rights reserved. The copyrights
embodied in the content of this file are licensed under the BSD
(revised) open source license
*/
#ifndef GD_H
#define GD_H
#include <math.h>
#include "example.h"
#include "parse_regressor.h"
#include "parser.h"
void print_result(int f, float res, v_array<char> tag);
struct gd_vars
{
float power_t;
gd_vars()
{};
void init()
{
power_t = 0.;
}
};
struct gd_thread_params
{
gd_vars* vars;
size_t thread_num;
regressor reg;
string* final_regressor_name;
};
float final_prediction(float ret, size_t num_features, float &norm);
float finalize_prediction(float ret);
float predict(weight* weights, const v_array<feature> &features);
float predict(regressor& r, example* ex, size_t thread_num, gd_vars& vars);
float offset_predict(regressor& r, example* ex, size_t thread_num, gd_vars& vars, size_t offset);
float inline_predict(regressor ®, example* &ec, size_t thread_num);
float one_of_quad_predict(v_array<feature> &page_features, feature& offer_feature, weight* weights, size_t mask);
float one_pf_quad_predict(weight* weights, feature& page_feature, v_array<feature> &offer_features, size_t mask);
float single_quad_weight(weight* weights, feature& page_feature, feature* offer_feature, size_t mask);
void inline_train(regressor ®, example* &ec, size_t thread_num, float update);
void quadratic(v_array<feature> &f, const v_array<feature> &first_part,
const v_array<feature> &second_part, size_t thread_mask);
void train(weight* weights, const v_array<feature> &features, float update);
void train_one_example(regressor& r, example* ex, size_t thread_num, gd_vars& vars);
void train_offset_example(regressor& r, example* ex, size_t thread_num, gd_vars& vars, size_t offset);
void compute_update(example* ec, gd_vars& vars);
void offset_train(regressor ®, example* &ec, size_t thread_num, float update, size_t offset);
void train_one_example_single_thread(regressor& r, example* ex, gd_vars& vars);
void setup_gd(gd_thread_params t);
void destroy_gd();
void output_and_account_example(example* ec);
void finish_example(example* ec);
#endif
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