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Adding more util functions

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This commit is contained in:
Alex Yatskov 2015-03-24 15:16:58 +09:00
parent 99f00d908e
commit d05c540dd7
1 changed files with 24 additions and 71 deletions
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95
util.go
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@ -22,22 +22,7 @@
package main
type Features map[string]float32
type Record struct {
features Features
compatibility float32
}
type RecordStats struct {
compatibility float32
count int
}
type Range struct {
min float32
max float32
}
import "sort"
func innerProduct(features1 Features, features2 Features) float32 {
var result float32
@ -49,7 +34,7 @@ func innerProduct(features1 Features, features2 Features) float32 {
return result
}
func walkMatches(records []Record, features Features, minScore float32, callback func(Record, float32)) {
func walkMatches(records Records, features Features, minScore float32, callback func(Record, float32)) {
for _, record := range records {
if score := innerProduct(features, record.features); score >= minScore {
callback(record, score)
@ -57,7 +42,7 @@ func walkMatches(records []Record, features Features, minScore float32, callback
}
}
func statRecords(records []Record, features Features, minScore float32) RecordStats {
func statRecords(records Records, features Features, minScore float32) RecordStats {
var stats RecordStats
walkMatches(records, features, minScore, func(record Record, score float32) {
stats.compatibility += record.compatibility
@ -67,7 +52,7 @@ func statRecords(records []Record, features Features, minScore float32) RecordSt
return stats
}
func step(rng Range, steps int, minScore float32, callback func(float32)) {
func stepRange(rng Range, steps int, callback func(float32)) {
stepSize := (rng.max - rng.min) / float32(steps)
for i := 0; i < steps; i++ {
@ -79,60 +64,28 @@ func step(rng Range, steps int, minScore float32, callback func(float32)) {
}
}
// function findRecords(data, features, minScore) {
// var results = [];
func findRecords(records Records, features Features, minScore float32) {
var foundRecords Records
// walkMatches(data, features, minScore, function(record, score) {
// results.push({
// name: record.name,
// score: score,
// distanceToUser: record.distanceToUser / 1000.0,
// distanceToStn: record.distanceToStn / 1000.0,
// closestStn: record.closestStn,
// accessCount: record.accessCount,
// id: record.id
// });
// });
walkMatches(records, features, minScore, func(record Record, score float32) {
foundRecords = append(foundRecords, record)
})
// results.sort(function(a, b) {
// return b.score - a.score;
// });
sort.Sort(foundRecords)
}
// return results;
// }
func project(records Records, features Features, featureName string, minScore float32, rng Range, steps int) []Projection {
sampleFeatures := make(Features)
for key, value := range features {
sampleFeatures[key] = value
}
// function project(data, features, feature, minScore, range, steps) {
// var sample = _.clone(features);
// var results = [];
var projection []Projection
stepRange(rng, steps, func(sample float32) {
sampleFeatures[featureName] = sample
stats := statRecords(records, sampleFeatures, minScore)
projection = append(projection, Projection{sample: sample, stats: stats})
})
// step(range, steps, function(position) {
// sample[feature] = position;
// results.push({
// sample: position,
// stats: statRecords(data, sample, minScore)
// });
// });
// return results;
// }
// function buildHints(data, features, feature, minScore, range, steps) {
// var projection = project(
// data,
// features,
// feature,
// minScore,
// range,
// steps
// );
// var hints = [];
// _.each(projection, function(result) {
// hints.push({
// sample: result.sample,
// stats: result.stats
// });
// });
// return hints;
// }
return projection
}