float
MatchPostScorer_score(MatchPostingScorer* self)
{
MatchPosting *const posting = (MatchPosting*)self->posting;
const u32_t freq = posting->freq;
float score = (freq < TERMSCORER_SCORE_CACHE_SIZE)
? self->score_cache[freq] /* cache hit */
: Sim_TF(self->sim, (float)freq) * self->weight;
return score;
}
ScorePostingMatcher*
ScorePostMatcher_init(ScorePostingMatcher *self, Similarity *sim,
PostingList *plist, Compiler *compiler) {
// Init.
TermMatcher_init((TermMatcher*)self, sim, plist, compiler);
ScorePostingMatcherIVARS *const ivars = ScorePostMatcher_IVARS(self);
// Fill score cache.
ivars->score_cache = (float*)MALLOCATE(TERMMATCHER_SCORE_CACHE_SIZE * sizeof(float));
for (uint32_t i = 0; i < TERMMATCHER_SCORE_CACHE_SIZE; i++) {
ivars->score_cache[i] = Sim_TF(sim, (float)i) * ivars->weight;
}
return self;
}
MatchPostingScorer*
MatchPostScorer_init(MatchPostingScorer *self, Similarity *sim,
PostingList *plist, Compiler *compiler)
{
u32_t i;
/* Init. */
TermScorer_init((TermScorer*)self, sim, plist, compiler);
/* Fill score cache. */
self->score_cache = MALLOCATE(TERMSCORER_SCORE_CACHE_SIZE, float);
for (i = 0; i < TERMSCORER_SCORE_CACHE_SIZE; i++) {
self->score_cache[i] = Sim_TF(sim, (float)i) * self->weight;
}
return self;
}
float
ScorePostMatcher_Score_IMP(ScorePostingMatcher* self) {
ScorePostingMatcherIVARS *const ivars = ScorePostMatcher_IVARS(self);
ScorePostingIVARS *const posting_ivars
= ScorePost_IVARS((ScorePosting*)ivars->posting);
const uint32_t freq = posting_ivars->freq;
// Calculate initial score based on frequency of term.
float score = (freq < TERMMATCHER_SCORE_CACHE_SIZE)
? ivars->score_cache[freq] // cache hit
: Sim_TF(ivars->sim, (float)freq) * ivars->weight;
// Factor in field-length normalization and doc/field/prox boost.
score *= posting_ivars->weight;
return score;
}
