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#include <stdlib.h>
#include "../core/char.h"
#include "../core/index.h"
#include "../error/error.h"
#include "../sequence/sequence.h"
#include "knowledge.h"
static int weighted_random_pick
(
const struct JH_knowledge_sequence_data sd [const restrict static 1],
JH_index result [const restrict static 1]
)
{
JH_index accumulator, random_number;
accumulator = 0;
if (sd->occurrences == 0)
{
return -1;
}
random_number = JH_index_random_up_to(sd->occurrences);
/*@ ensures (0 <= random_number <= weights_sum); @*/
*result = 0;
for (;;)
{
accumulator += sd->targets[*result].occurrences;
if (accumulator < random_number)
{
*result += 1;
}
else
{
*result = sd->targets[*result].id;
return 0;
}
}
}
int JH_knowledge_random_tws_target
(
const struct JH_knowledge k [const static 1],
JH_index target [const restrict static 1],
const JH_index word_id,
const JH_index sequence_id
)
{
JH_index s_index;
if
(
JH_knowledge_find_markov_sequence
(
sequence_id,
&(k->words[word_id].tws),
&s_index
) < 0
)
{
return -1;
}
return
weighted_random_pick
(
&(k->words[word_id].tws.sequences_ref[s_index]),
target
);
}
int JH_knowledge_random_swt_target
(
const struct JH_knowledge k [const static 1],
const JH_index sequence_id,
const JH_index word_id,
JH_index target [const restrict static 1]
)
{
JH_index s_index;
if
(
JH_knowledge_find_markov_sequence
(
sequence_id,
&(k->words[word_id].swt),
&s_index
) < 0
)
{
return -1;
}
return
weighted_random_pick
(
&(k->words[word_id].swt.sequences_ref[s_index]),
target
);
}
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