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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "utils.h"
#include <vespa/searchlib/fef/itablemanager.h>
#include <vespa/searchlib/fef/properties.h>
#include <vespa/searchlib/fef/itermdata.h>
#include <vespa/vespalib/util/stringfmt.h>
#include <vespa/vespalib/stllike/asciistream.h>
#include <cmath>
#include <ostream>
#include <vespa/vespalib/util/issue.h>
using vespalib::Issue;
#include <vespa/log/log.h>
LOG_SETUP(".features.utils");
using namespace search::fef;
namespace search::features::util {
feature_t
lookupConnectedness(const search::fef::IQueryEnvironment& env, uint32_t termId, feature_t fallback)
{
if (termId == 0) {
return fallback; // no previous term
}
const ITermData * data = env.getTerm(termId);
const ITermData * prev = env.getTerm(termId - 1);
if (data == nullptr || prev == nullptr) {
return fallback; // default value
}
return lookupConnectedness(env, data->getUniqueId(), prev->getUniqueId(), fallback);
}
feature_t
lookupConnectedness(const search::fef::IQueryEnvironment& env,
uint32_t currUniqueId, uint32_t prevUniqueId, feature_t fallback)
{
// Connectedness of 0.5 between term with unique id 2 and term with unique id 1 is represented as:
// [vespa.term.2.connexity: "1", vespa.term.2.connexity: "0.5"]
vespalib::asciistream os;
os << "vespa.term." << currUniqueId << ".connexity";
Property p = env.getProperties().lookup(os.str());
if (p.size() == 2) {
// we have a defined connectedness with the previous term
if (strToNum<uint32_t>(p.getAt(0)) == prevUniqueId) {
return strToNum<feature_t>(p.getAt(1));
}
}
return fallback;
}
feature_t
lookupSignificance(const search::fef::IQueryEnvironment& env, const ITermData& term, feature_t fallback)
{
// Significance of 0.5 for term with unique id 1 is represented as:
// [vespa.term.1.significance: "0.5"]
vespalib::asciistream os;
os << "vespa.term." << term.getUniqueId() << ".significance";
Property p = env.getProperties().lookup(os.str());
if (p.found()) {
return strToNum<feature_t>(p.get());
}
return fallback;
}
feature_t
lookupSignificance(const search::fef::IQueryEnvironment& env, uint32_t termId, feature_t fallback)
{
const ITermData* term = env.getTerm(termId);
if (term == nullptr) {
return fallback;
}
return lookupSignificance(env, *term, fallback);
}
double
getRobertsonSparckJonesWeight(double docCount, double docsInCorpus)
{
return std::log((docsInCorpus - docCount + 0.5)/(docCount + 0.5));
}
static const double N = 1000000.0;
feature_t
getSignificance(double docFreq)
{
if (docFreq < (1.0/N)) {
docFreq = 1.0/N;
}
if (docFreq > 1.0) {
docFreq = 1.0;
}
double d = std::log(docFreq)/std::log(1.0/N);
return 0.5 + 0.5 * d;
#if 0
double n = docFreq * N;
n = (n == 0) ? 1 : (n > N ? N : n);
double a = getRobertsonSparckJonesWeight(1, N + 1);
double b = getRobertsonSparckJonesWeight(N + 1, N + 1);
double w = getRobertsonSparckJonesWeight(n, N + 1);
return ((w - b)/(a - b));
#endif
}
feature_t
getSignificance(const search::fef::ITermData& termData)
{
using FRA = search::fef::ITermFieldRangeAdapter;
double df = 0;
for (FRA iter(termData); iter.valid(); iter.next()) {
df = std::max(df, iter.get().getDocFreq());
}
feature_t signif = getSignificance(df);
LOG(debug, "getSignificance %e %f [ %e %f ] = %e", df, df, df * N, df * N, signif);
return signif;
}
const search::fef::Table *
lookupTable(const search::fef::IIndexEnvironment & env, const vespalib::string & featureName,
const vespalib::string & table, const vespalib::string & fieldName, const vespalib::string & fallback)
{
vespalib::string tn1 = env.getProperties().lookup(featureName, table).get(fallback);
vespalib::string tn2 = env.getProperties().lookup(featureName, table, fieldName).get(tn1);
const search::fef::Table * retval = env.getTableManager().getTable(tn2);
if (retval == nullptr) {
LOG(warning, "Could not find the %s '%s' to be used for field '%s' in feature '%s'",
table.c_str(), tn2.c_str(), fieldName.c_str(), featureName.c_str());
}
return retval;
}
const search::fef::ITermData *
getTermByLabel(const search::fef::IQueryEnvironment &env, const vespalib::string &label)
{
// Labeling the query item with unique id '5' with the label 'foo'
// is represented as: [vespa.label.foo.id: "5"]
vespalib::asciistream os;
os << "vespa.label." << label << ".id";
Property p = env.getProperties().lookup(os.str());
if (!p.found()) {
return 0;
}
uint32_t uid = strToNum<uint32_t>(p.get());
if (uid == 0) {
Issue::report("Query label '%s' was attached to invalid unique id: '%s'",
label.c_str(), p.get().c_str());
return 0;
}
for (uint32_t i(0), m(env.getNumTerms()); i < m; ++i) {
const ITermData *term = env.getTerm(i);
if (term->getUniqueId() == uid) {
return term;
}
}
Issue::report("Query label '%s' was attached to non-existing unique id: '%s'",
label.c_str(), p.get().c_str());
return 0;
}
}
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