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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "foreachfeature.h"
#include "valuefeature.h"
#include "utils.h"
#include <vespa/searchlib/fef/properties.h>
#include <vespa/vespalib/util/stringfmt.h>
#include <vespa/vespalib/util/stash.h>
#include <vespa/vespalib/stllike/replace_variable.h>
#include <vespa/log/log.h>
LOG_SETUP(".features.foreachfeature");
using namespace search::fef;
namespace search::features {
template <typename CO, typename OP>
ForeachExecutor<CO, OP>::ForeachExecutor(const CO & condition, uint32_t numInputs) :
FeatureExecutor(),
_condition(condition),
_operation(),
_numInputs(numInputs)
{
}
template <typename CO, typename OP>
void
ForeachExecutor<CO, OP>::execute(uint32_t)
{
_operation.reset();
for (uint32_t i = 0; i < inputs().size(); ++i) {
feature_t val = inputs().get_number(i);
if (_condition.useValue(val)) {
_operation.onValue(val);
}
}
outputs().set_number(0, _operation.getResult());
}
bool
ForeachBlueprint::decideDimension(const vespalib::string & param)
{
if (param == "terms") {
_dimension = TERMS;
} else if (param == "fields") {
_dimension = FIELDS;
} else if (param == "attributes") {
_dimension = ATTRIBUTES;
} else {
LOG(error, "Expected dimension parameter to be 'terms', 'fields', or 'attributes', but was '%s'",
param.c_str());
return false;
}
return true;
}
bool
ForeachBlueprint::decideCondition(const vespalib::string & condition, const vespalib::string & operation)
{
if (condition == "true") {
return decideOperation(TrueCondition(), operation);
} else if (condition.size() >= 2 && condition[0] == '<') {
return decideOperation(LessThanCondition(util::strToNum<feature_t>(condition.substr(1))), operation);
} else if (condition.size() >= 2 && condition[0] == '>') {
return decideOperation(GreaterThanCondition(util::strToNum<feature_t>(condition.substr(1))), operation);
} else {
LOG(error, "Expected condition parameter to be 'true', '<a', or '>a', but was '%s'",
condition.c_str());
return false;
}
}
template <typename CO>
bool
ForeachBlueprint::decideOperation(CO condition, const vespalib::string & operation)
{
if (operation == "sum") {
setExecutorCreator<CO, SumOperation>(condition);
} else if (operation == "product") {
setExecutorCreator<CO, ProductOperation>(condition);
} else if (operation == "average") {
setExecutorCreator<CO, AverageOperation>(condition);
} else if (operation == "max") {
setExecutorCreator<CO, MaxOperation>(condition);
} else if (operation == "min") {
setExecutorCreator<CO, MinOperation>(condition);
} else if (operation == "count") {
setExecutorCreator<CO, CountOperation>(condition);
} else {
LOG(error, "Expected operation parameter to be 'sum', 'product', 'average', 'max', 'min', or 'count', but was '%s'",
operation.c_str());
return false;
}
return true;
}
template <typename CO, typename OP>
void
ForeachBlueprint::setExecutorCreator(CO condition)
{
class ExecutorCreator : public ExecutorCreatorBase {
private:
CO _condition;
public:
ExecutorCreator(CO cond) : _condition(cond) {}
search::fef::FeatureExecutor &create(uint32_t numInputs, vespalib::Stash &stash) const override {
return stash.create<ForeachExecutor<CO, OP>>(_condition, numInputs);
}
};
_executorCreator.reset(new ExecutorCreator(condition));
}
ForeachBlueprint::ForeachBlueprint() :
Blueprint("foreach"),
_dimension(ILLEGAL),
_executorCreator(),
_num_inputs(0)
{
}
ForeachBlueprint::~ForeachBlueprint() = default;
void
ForeachBlueprint::visitDumpFeatures(const IIndexEnvironment &,
IDumpFeatureVisitor &) const
{
}
bool
ForeachBlueprint::setup(const IIndexEnvironment & env,
const ParameterList & params)
{
if (!decideDimension(params[0].getValue())) {
return false;
}
if (!decideCondition(params[3].getValue(), params[4].getValue())) {
return false;
}
const vespalib::string & variable = params[1].getValue();
const vespalib::string & feature = params[2].getValue();
if (_dimension == TERMS) {
uint32_t maxTerms = util::strToNum<uint32_t>(env.getProperties().lookup(getBaseName(), "maxTerms").get("16"));
for (uint32_t i = 0; i < maxTerms; ++i) {
defineInput(vespalib::replace_variable(feature, variable, vespalib::make_string("%u", i)));
++_num_inputs;
}
} else {
for (uint32_t i = 0; i < env.getNumFields(); ++i) {
const FieldInfo * info = env.getField(i);
if (info->type() == FieldType::INDEX && _dimension == FIELDS) {
defineInput(vespalib::replace_variable(feature, variable, info->name()));
++_num_inputs;
} else if (info->type() == FieldType::ATTRIBUTE && _dimension == ATTRIBUTES) {
defineInput(vespalib::replace_variable(feature, variable, info->name()));
++_num_inputs;
}
}
}
describeOutput("value", "The result after iterating over the input feature values using the specified operation");
return true;
}
Blueprint::UP
ForeachBlueprint::createInstance() const
{
return std::make_unique<ForeachBlueprint>();
}
FeatureExecutor &
ForeachBlueprint::createExecutor(const IQueryEnvironment &, vespalib::Stash &stash) const
{
if (_executorCreator) {
return _executorCreator->create(_num_inputs, stash);
}
return stash.create<SingleZeroValueExecutor>();
}
}
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