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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "max_reduce_prod_join_replacer.h"
#include <vespa/eval/eval/function.h>
#include <vespa/eval/eval/basic_nodes.h>
#include <vespa/eval/eval/operator_nodes.h>
#include <vespa/eval/eval/tensor_nodes.h>
#include <vespa/searchlib/features/rankingexpression/intrinsic_blueprint_adapter.h>
#include <vespa/searchlib/fef/featurenameparser.h>
#include <vespa/log/log.h>
LOG_SETUP(".features.max_reduce_prod_join_replacer");
namespace search::features {
using fef::Blueprint;
using fef::FeatureNameParser;
using fef::IIndexEnvironment;
using rankingexpression::ExpressionReplacer;
using rankingexpression::IntrinsicBlueprintAdapter;
using rankingexpression::IntrinsicExpression;
using vespalib::eval::Aggr;
using vespalib::eval::Function;
using vespalib::eval::nodes::Mul;
using vespalib::eval::nodes::Node;
using vespalib::eval::nodes::Symbol;
using vespalib::eval::nodes::TensorJoin;
using vespalib::eval::nodes::TensorReduce;
using vespalib::eval::nodes::as;
namespace {
bool match_params(const Node &a, const Node &b) {
bool first = false;
bool second = false;
for (int i = 0; i < 2; ++i) {
const Node &node = (i == 0) ? a : b;
if (auto symbol = as<Symbol>(node)) {
if (symbol->id() == 0) {
first = true;
} else if (symbol->id() == 1) {
second = true;
}
}
}
return (first && second);
};
bool match_prod_join(const Node &node) {
if (auto join = as<TensorJoin>(node)) {
const Node &root = join->lambda().root();
if (as<Mul>(root)) {
return match_params(root.get_child(0), root.get_child(1));
}
}
return false;
}
bool match_max_reduce(const Node &node, vespalib::string &reduce_dim) {
auto reduce = as<TensorReduce>(node);
if (!reduce || (reduce->aggr() != Aggr::MAX) || (reduce->dimensions().size() > 1)) {
return false;
}
if (reduce->dimensions().size() == 1) {
reduce_dim = reduce->dimensions()[0];
}
return true;
}
bool match_function(const Function &function, vespalib::string &reduce_dim) {
const Node &expect_max = function.root();
if ((function.num_params() == 2) && match_max_reduce(expect_max, reduce_dim)) {
const Node &expect_mul = expect_max.get_child(0);
if (as<Mul>(expect_mul) || match_prod_join(expect_mul)) {
return match_params(expect_mul.get_child(0), expect_mul.get_child(1));
}
}
return false;
}
void try_extract_param(const vespalib::string &feature, const vespalib::string &wanted_wrapper,
vespalib::string ¶m, vespalib::string &dim)
{
FeatureNameParser parser(feature);
if (parser.valid() &&
(parser.parameters().size() >= 1) &&
(parser.parameters().size() <= 2))
{
vespalib::string wrapper;
vespalib::string body;
vespalib::string error;
if (Function::unwrap(parser.parameters()[0], wrapper, body, error) &&
(wrapper == wanted_wrapper))
{
param = body;
if (parser.parameters().size() == 2) {
dim = parser.parameters()[1];
} else {
dim = param;
}
}
}
}
struct MatchInputs {
vespalib::string attribute;
vespalib::string attribute_dim;
vespalib::string query;
vespalib::string query_dim;
MatchInputs() : attribute(), attribute_dim(), query(), query_dim() {}
void process(const vespalib::string ¶m) {
if (starts_with(param, "tensorFromLabels")) {
try_extract_param(param, "attribute", attribute, attribute_dim);
} else if (starts_with(param, "tensorFromWeightedSet")) {
try_extract_param(param, "query", query, query_dim);
}
}
bool matched() const {
return (!attribute.empty() && !query.empty() && (attribute_dim == query_dim));
}
};
struct MaxReduceProdJoinReplacerImpl : ExpressionReplacer {
Blueprint::UP proto;
MaxReduceProdJoinReplacerImpl(Blueprint::UP proto_in)
: proto(std::move(proto_in)) {}
IntrinsicExpression::UP maybe_replace(const Function &function,
const IIndexEnvironment &env) const override
{
vespalib::string reduce_dim;
if (match_function(function, reduce_dim)) {
MatchInputs match_inputs;
match_inputs.process(function.param_name(0));
match_inputs.process(function.param_name(1));
if (match_inputs.matched() && (reduce_dim.empty() || (reduce_dim == match_inputs.attribute_dim))) {
return IntrinsicBlueprintAdapter::try_create(*proto, env, {match_inputs.attribute, match_inputs.query});
}
}
return IntrinsicExpression::UP(nullptr);
}
};
} // namespace search::features::<unnamed>
ExpressionReplacer::UP
MaxReduceProdJoinReplacer::create(Blueprint::UP proto)
{
return std::make_unique<MaxReduceProdJoinReplacerImpl>(std::move(proto));
}
} // namespace search::features
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