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/*
* Copyright (c) 2009, Rambler media
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY Rambler media ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Rambler BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Winnow classifier
*/
#include "classifiers.h"
#include "../main.h"
#include "../filter.h"
#include "../cfg_file.h"
#define WINNOW_PROMOTION 1.23
#define WINNOW_DEMOTION 0.83
struct winnow_callback_data {
statfile_pool_t *pool;
struct classifier_ctx *ctx;
stat_file_t *file;
double sum;
int count;
int in_class;
time_t now;
};
static gboolean
classify_callback (gpointer key, gpointer value, gpointer data)
{
token_node_t *node = key;
struct winnow_callback_data *cd = data;
float v;
/* Consider that not found blocks have value 1 */
if ((v = statfile_pool_get_block (cd->pool, cd->file, node->h1, node->h2, cd->now)) < 0.00001) {
cd->sum += 1;
}
else {
cd->sum += v;
cd->in_class ++;
}
cd->count ++;
return FALSE;
}
static gboolean
learn_callback (gpointer key, gpointer value, gpointer data)
{
token_node_t *node = key;
struct winnow_callback_data *cd = data;
float v, c;
c = (cd->in_class) ? WINNOW_PROMOTION : WINNOW_DEMOTION;
/* Consider that not found blocks have value 1 */
if ((v = statfile_pool_get_block (cd->pool, cd->file, node->h1, node->h2, cd->now)) < 0.00001) {
statfile_pool_set_block (cd->pool, cd->file, node->h1, node->h2, cd->now, c);
}
else {
statfile_pool_set_block (cd->pool, cd->file, node->h1, node->h2, cd->now, v * c);
}
cd->count ++;
return FALSE;
}
struct classifier_ctx*
winnow_init (memory_pool_t *pool, struct classifier_config *cfg)
{
struct classifier_ctx *ctx = memory_pool_alloc (pool, sizeof (struct classifier_ctx));
ctx->pool = pool;
ctx->cfg = cfg;
return ctx;
}
void
winnow_classify (struct classifier_ctx *ctx, statfile_pool_t *pool, GTree *input, struct worker_task *task)
{
struct winnow_callback_data data;
double *res = memory_pool_alloc (ctx->pool, sizeof (double));
double max = 0;
GList *cur;
struct statfile *st, *sel = NULL;
g_assert (pool != NULL);
g_assert (ctx != NULL);
data.pool = pool;
data.sum = 0;
data.count = 0;
data.now = time (NULL);
data.ctx = ctx;
cur = ctx->cfg->statfiles;
while (cur) {
st = cur->data;
if ((data.file = statfile_pool_is_open (pool, st->path)) == NULL) {
if ((data.file = statfile_pool_open (pool, st->path)) == NULL) {
msg_warn ("winnow_classify: cannot open %s, skip it", st->path);
cur = g_list_next (cur);
continue;
}
}
g_tree_foreach (input, classify_callback, &data);
if (data.count != 0) {
*res = (data.sum / data.count);
}
else {
*res = 0;
}
if (*res > max) {
max = *res;
sel = st;
}
cur = g_list_next (cur);
}
if (sel != NULL) {
insert_result (task, ctx->cfg->metric, sel->symbol, 1, NULL);
}
}
void
winnow_learn (struct classifier_ctx *ctx, statfile_pool_t *pool, char *symbol, GTree *input, int in_class)
{
struct winnow_callback_data data = {
.file = NULL,
.sum = 0,
.count = 0,
};
GList *cur;
struct statfile *st;
g_assert (pool != NULL);
g_assert (ctx != NULL);
data.pool = pool;
data.in_class = in_class;
data.now = time (NULL);
data.ctx = ctx;
cur = g_list_first (ctx->cfg->statfiles);
while (cur) {
st = cur->data;
if (strcmp (symbol, st->symbol) == 0) {
if ((data.file = statfile_pool_open (pool, st->path)) == NULL) {
/* Try to create statfile */
if (statfile_pool_create (pool,
st->path, st->size / sizeof (struct stat_file_block)) == -1) {
msg_err ("winnow_learn: cannot create statfile %s", st->path);
return;
}
if ((data.file = statfile_pool_open (pool, st->path)) == NULL) {
msg_err ("winnow_learn: cannot create statfile %s", st->path);
return;
}
}
break;
}
cur = g_list_next (cur);
}
if (data.file != NULL) {
statfile_pool_lock_file (pool, data.file);
g_tree_foreach (input, learn_callback, &data);
statfile_pool_unlock_file (pool, data.file);
}
}
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