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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "random_normal_stable_feature.h"
#include "utils.h"
#include <vespa/searchlib/fef/properties.h>
#include <vespa/vespalib/util/stash.h>
#include <cinttypes>
#include <vespa/log/log.h>
LOG_SETUP(".features.randomnormalstablefeature");
namespace search::features {
RandomNormalStableExecutor::RandomNormalStableExecutor(uint64_t seed, double mean, double stddev) :
search::fef::FeatureExecutor(),
_rnd(mean, stddev, false), // don't use spares, as we reset seed on every generation
_seed(seed)
{
LOG(debug, "RandomNormalStableExecutor: seed=%" PRIu64 ", mean=%f, stddev=%f", seed, mean, stddev);
}
void
RandomNormalStableExecutor::execute(uint32_t docId)
{
_rnd.seed(_seed + docId);
outputs().set_number(0, _rnd.next());
}
RandomNormalStableBlueprint::RandomNormalStableBlueprint() :
search::fef::Blueprint("randomNormalStable"),
_seed(0),
_mean(0.0),
_stddev(1.0)
{
}
void
RandomNormalStableBlueprint::visitDumpFeatures(const search::fef::IIndexEnvironment &,
search::fef::IDumpFeatureVisitor &) const
{
}
search::fef::Blueprint::UP
RandomNormalStableBlueprint::createInstance() const
{
return std::make_unique<RandomNormalStableBlueprint>();
}
bool
RandomNormalStableBlueprint::setup(const search::fef::IIndexEnvironment & env,
const search::fef::ParameterList & params)
{
search::fef::Property p = env.getProperties().lookup(getName(), "seed");
if (p.found()) {
_seed = util::strToNum<uint64_t>(p.get());
}
if (params.size() > 0) {
_mean = params[0].asDouble();
}
if (params.size() > 1) {
_stddev = params[1].asDouble();
}
describeOutput("out" , "A random value drawn from the Gaussian distribution that is stable for a given match (document and query)");
return true;
}
search::fef::FeatureExecutor &
RandomNormalStableBlueprint::createExecutor(const search::fef::IQueryEnvironment &env, vespalib::Stash &stash) const
{
uint64_t seed = _seed;
if (seed == 0) {
seed = util::strToNum<uint64_t>
(env.getProperties().lookup(getName(), "seed").get("1024")); // default seed
}
return stash.create<RandomNormalStableExecutor>(seed, _mean, _stddev);
}
}
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