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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "distancetopathfeature.h"
#include "utils.h"
#include <vespa/searchlib/fef/matchdata.h>
#include <vespa/searchlib/fef/properties.h>
#include <vespa/document/datatype/positiondatatype.h>
#include <vespa/vespalib/geo/zcurve.h>
#include <vespa/vespalib/util/issue.h>
#include <vespa/vespalib/util/stash.h>
#include <vespa/vespalib/text/stringtokenizer.h>
#include <cmath>
#include <vespa/log/log.h>
LOG_SETUP(".features.distancetopathfeature");
using vespalib::Issue;
namespace search::features {
const feature_t DistanceToPathExecutor::DEFAULT_DISTANCE(6400000000.0);
DistanceToPathExecutor::DistanceToPathExecutor(std::vector<Vector2> &path,
const search::attribute::IAttributeVector *pos) :
search::fef::FeatureExecutor(),
_intBuf(),
_path(),
_pos(pos)
{
if (_pos != nullptr) {
_intBuf.allocate(_pos->getMaxValueCount());
}
_path.swap(path); // avoid copy
}
void
DistanceToPathExecutor::execute(uint32_t docId)
{
if (_path.size() > 1 && _pos != nullptr) {
double pos = -1, trip = 0, product = 0;
double minSqDist = std::numeric_limits<double>::max();
_intBuf.fill(*_pos, docId);
// For each line segment, do
for (uint32_t seg = 1; seg < _path.size(); ++seg) {
const Vector2 &p1 = _path[seg - 1];
const Vector2 &p2 = _path[seg];
double len2 = (p2.x - p1.x) * (p2.x - p1.x) + (p2.y - p1.y) * (p2.y - p1.y);
double len = std::sqrt(len2);
// For each document location, do
for (auto loc : _intBuf) {
int32_t x = 0, y = 0;
vespalib::geo::ZCurve::decode(loc, &x, &y);
double u = 0, dx, dy;
if (len < 1e-6) {
dx = p1.x - x; // process as point
dy = p1.y - y;
} else {
u = std::min(1.0, std::max(0.0, (((x - p1.x) * (p2.x - p1.x)) + ((y - p1.y) * (p2.y - p1.y))) / len2));
if (u == 0) {
dx = p1.x - x; // intersection before segment
dy = p1.y - y;
} else if (u == 1) {
dx = p2.x - x; // intersection after segment
dy = p2.y - y;
} else {
dx = p1.x + u * (p2.x - p1.x) - x;
dy = p1.y + u * (p2.y - p1.y) - y;
}
}
double sqDist = dx * dx + dy * dy;
if (sqDist < minSqDist) {
minSqDist = sqDist;
pos = trip + u * len;
product = (p2.x - p1.x) * dy - (p2.y - p1.y) * dx;
}
}
trip += len;
}
outputs().set_number(0, static_cast<feature_t>(std::sqrt(static_cast<feature_t>(minSqDist))));
outputs().set_number(1, static_cast<feature_t>(pos > -1 ? (trip > 0 ? pos / trip : 0) : 1));
outputs().set_number(2, static_cast<feature_t>(product));
} else {
outputs().set_number(0, DEFAULT_DISTANCE);
outputs().set_number(1, 1);
outputs().set_number(2, 0);
}
}
DistanceToPathBlueprint::DistanceToPathBlueprint() :
Blueprint("distanceToPath"),
_posAttr()
{
}
DistanceToPathBlueprint::~DistanceToPathBlueprint() = default;
void
DistanceToPathBlueprint::visitDumpFeatures(const search::fef::IIndexEnvironment &,
search::fef::IDumpFeatureVisitor &) const
{
}
search::fef::Blueprint::UP
DistanceToPathBlueprint::createInstance() const
{
return std::make_unique<DistanceToPathBlueprint>();
}
bool
DistanceToPathBlueprint::setup(const search::fef::IIndexEnvironment&,
const search::fef::ParameterList & params)
{
_posAttr = params[0].getValue();
describeOutput("distance", "The euclidean distance from the query path.");
describeOutput("traveled", "The normalized distance traveled along the path before intersection.");
describeOutput("product", "The cross-product of the intersecting line segment and the intersection-to-document vector.");
return true;
}
search::fef::FeatureExecutor &
DistanceToPathBlueprint::createExecutor(const search::fef::IQueryEnvironment &env, vespalib::Stash &stash) const
{
// Retrieve path from query using the name of this and "path" as property.
std::vector<Vector2> path;
search::fef::Property pro = env.getProperties().lookup(getName(), "path");
if (pro.found()) {
vespalib::stringref str = pro.getAt(0);
uint32_t len = str.size();
if ((len > 1) && (str[0] == '(') && (str[len - 1] == ')')) {
str = str.substr(1, len - 1); // remove braces
vespalib::StringTokenizer tokenizer(str);
for (uint32_t i = 0; (i + 2) <= tokenizer.size(); i += 2) {
auto x = util::strToNum<double>(tokenizer[i]);
auto y = util::strToNum<double>(tokenizer[i + 1]);
path.emplace_back(x, y);
}
}
}
// Lookup the attribute vector that holds document positions.
const search::attribute::IAttributeVector *pos = nullptr;
if (path.size() > 1) {
pos = env.getAttributeContext().getAttribute(_posAttr);
if (pos == nullptr) {
pos = env.getAttributeContext().getAttribute(document::PositionDataType::getZCurveFieldName(_posAttr));
}
if (pos != nullptr) {
if (!pos->isIntegerType()) {
Issue::report("distance_to_path feature: The position attribute '%s' is not an integer attribute. Will use default distance.",
pos->getName().c_str());
pos = nullptr;
} else if (pos->getCollectionType() == attribute::CollectionType::WSET) {
Issue::report("distance_to_path feature: The position attribute '%s' is a weighted set attribute. Will use default distance.",
pos->getName().c_str());
pos = nullptr;
}
} else {
Issue::report("distance_to_path feature: The position attribute '%s' was not found. Will use default distance.", _posAttr.c_str());
}
} else {
Issue::report("distance_to_path feature: No path given in query. Will use default distance.");
}
// Create and return a compatible executor.
return stash.create<DistanceToPathExecutor>(path, pos);
}
}
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