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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "param_usage.h"
#include "function.h"
#include "node_traverser.h"
#include "basic_nodes.h"
namespace vespalib {
namespace eval {
using namespace nodes;
namespace {
//-----------------------------------------------------------------------------
struct CountUsage : NodeTraverser {
double p;
std::vector<double> result;
CountUsage(size_t num_params) : p(1.0), result(num_params, 0.0) {}
~CountUsage() override;
bool open(const Node &node) override {
if (auto if_node = as<If>(node)) {
double my_p = p;
if_node->cond().traverse(*this);
p = my_p * if_node->p_true();
if_node->true_expr().traverse(*this);
p = my_p * (1 - if_node->p_true());
if_node->false_expr().traverse(*this);
p = my_p;
return false;
}
return true;
}
void close(const Node &node) override {
if (auto symbol = as<Symbol>(node)) {
result[symbol->id()] += p;
}
}
};
CountUsage::~CountUsage() = default;
//-----------------------------------------------------------------------------
struct CheckUsage : NodeTraverser {
std::vector<double> result;
CheckUsage(size_t num_params) : result(num_params, 0.0) {}
~CheckUsage() override;
void merge(const std::vector<double> &true_result,
const std::vector<double> &false_result,
double p_true)
{
for (size_t i = 0; i < result.size(); ++i) {
double p_mixed = (true_result[i] * p_true) + (false_result[i] * (1 - p_true));
double p_not_used = (1 - result[i]) * (1 - p_mixed);
result[i] = (1 - p_not_used);
}
}
bool open(const Node &node) override {
if (auto if_node = as<If>(node)) {
if_node->cond().traverse(*this);
CheckUsage check_true(result.size());
if_node->true_expr().traverse(check_true);
CheckUsage check_false(result.size());
if_node->false_expr().traverse(check_false);
merge(check_true.result, check_false.result, if_node->p_true());
return false;
}
return true;
}
void close(const Node &node) override {
if (auto symbol = as<Symbol>(node)) {
result[symbol->id()] = 1.0;
}
}
};
CheckUsage::~CheckUsage() = default;
//-----------------------------------------------------------------------------
} // namespace vespalib::eval::<unnamed>
std::vector<double>
count_param_usage(const Function &function)
{
CountUsage count_usage(function.num_params());
function.root().traverse(count_usage);
return count_usage.result;
}
std::vector<double>
check_param_usage(const Function &function)
{
CheckUsage check_usage(function.num_params());
function.root().traverse(check_usage);
return check_usage.result;
}
} // namespace vespalib::eval
} // namespace vespalib
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