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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "randomfeature.h"
#include "utils.h"
#include <vespa/searchlib/fef/properties.h>
#include <vespa/vespalib/util/stash.h>
#include <chrono>
#include <cinttypes>
#include <vespa/log/log.h>
LOG_SETUP(".features.randomfeature");
namespace search::features {
RandomExecutor::RandomExecutor(uint64_t seed, uint64_t matchSeed)
: fef::FeatureExecutor(),
_rnd(),
_matchRnd(),
_matchSeed(matchSeed)
{
LOG(debug, "RandomExecutor: seed=%" PRIu64 ", matchSeed=%" PRIu64, seed, matchSeed);
_rnd.srand48(seed);
}
void
RandomExecutor::execute(uint32_t docId)
{
feature_t rndScore = _rnd.lrand48() / (feature_t)0x80000000u; // 2^31
_matchRnd.srand48(_matchSeed + docId);
feature_t matchRndScore = _matchRnd.lrand48() / (feature_t)0x80000000u; // 2^31
outputs().set_number(0, rndScore);
outputs().set_number(1, matchRndScore);
}
RandomBlueprint::RandomBlueprint() :
fef::Blueprint("random"),
_seed(0)
{
}
void
RandomBlueprint::visitDumpFeatures(const fef::IIndexEnvironment &, fef::IDumpFeatureVisitor &) const
{
}
fef::Blueprint::UP
RandomBlueprint::createInstance() const
{
return std::make_unique<RandomBlueprint>();
}
bool
RandomBlueprint::setup(const fef::IIndexEnvironment & env, const fef::ParameterList &)
{
fef::Property p = env.getProperties().lookup(getName(), "seed");
if (p.found()) {
_seed = util::strToNum<uint64_t>(p.get());
}
describeOutput("out" , "A random value in the interval [0, 1>");
describeOutput("match" , "A random value in the interval [0, 1> that is stable for a given match (document and query)");
return true;
}
using namespace std::chrono;
fef::FeatureExecutor &
RandomBlueprint::createExecutor(const fef::IQueryEnvironment &env, vespalib::Stash &stash) const
{
uint64_t seed = _seed;
if (seed == 0) {
seed = static_cast<uint64_t>(duration_cast<microseconds>(system_clock::now().time_since_epoch()).count()) ^
reinterpret_cast<uint64_t>(&seed); // results in different seeds in different threads
}
uint64_t matchSeed = util::strToNum<uint64_t>
(env.getProperties().lookup(getName(), "match", "seed").get("1024")); // default seed
return stash.create<RandomExecutor>(seed, matchSeed);
}
}
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