139 lines
3.9 KiB
Go
139 lines
3.9 KiB
Go
/*
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* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
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* Author: Alex Yatskov <alex@foosoft.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package main
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type Features map[string]float32
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type Record struct {
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features Features
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compatibility float32
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}
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type RecordStats struct {
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compatibility float32
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count int
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}
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type Range struct {
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min float32
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max float32
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}
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func innerProduct(features1 Features, features2 Features) float32 {
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var result float32
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for key, value1 := range features1 {
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value2, _ := features2[key]
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result += value1 * value2
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}
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return result
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}
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func walkMatches(records []Record, features Features, minScore float32, callback func(Record, float32)) {
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for _, record := range records {
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if score := innerProduct(features, record.features); score >= minScore {
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callback(record, score)
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}
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}
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}
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func statRecords(records []Record, features Features, minScore float32) RecordStats {
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var stats RecordStats
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walkMatches(records, features, minScore, func(record Record, score float32) {
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stats.compatibility += record.compatibility
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stats.count++
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})
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return stats
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}
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func step(rng Range, steps int, minScore float32, callback func(float32)) {
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stepSize := (rng.max - rng.min) / float32(steps)
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for i := 0; i < steps; i++ {
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stepMax := rng.max - stepSize*float32(i)
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stepMin := stepMax - stepSize
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stepMid := (stepMin + stepMax) / 2
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callback(stepMid)
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}
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}
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// function findRecords(data, features, minScore) {
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// var results = [];
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// walkMatches(data, features, minScore, function(record, score) {
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// results.push({
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// name: record.name,
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// score: score,
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// distanceToUser: record.distanceToUser / 1000.0,
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// distanceToStn: record.distanceToStn / 1000.0,
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// closestStn: record.closestStn,
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// accessCount: record.accessCount,
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// id: record.id
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// });
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// });
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// results.sort(function(a, b) {
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// return b.score - a.score;
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// });
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// return results;
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// }
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// function project(data, features, feature, minScore, range, steps) {
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// var sample = _.clone(features);
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// var results = [];
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// step(range, steps, function(position) {
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// sample[feature] = position;
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// results.push({
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// sample: position,
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// stats: statRecords(data, sample, minScore)
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// });
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// });
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// return results;
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// }
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// function buildHints(data, features, feature, minScore, range, steps) {
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// var projection = project(
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// data,
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// features,
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// feature,
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// minScore,
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// range,
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// steps
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// );
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// var hints = [];
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// _.each(projection, function(result) {
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// hints.push({
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// sample: result.sample,
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// stats: result.stats
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// });
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// });
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// return hints;
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// }
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