Created
March 31, 2018 02:23
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package main | |
import ( | |
"encoding/gob" | |
"fmt" | |
"log" | |
"math" | |
"os" | |
"sort" | |
"gonum.org/v1/gonum/mat" | |
) | |
type CosineSimilarity struct { | |
word string | |
value float64 | |
} | |
func main() { | |
frp, err := os.Open("../data/q85.proj.txt") | |
if err != nil { | |
log.Fatal(err) | |
} | |
defer frp.Close() | |
dec := gob.NewDecoder(frp) | |
var proj mat.Dense | |
err = dec.Decode(&proj) | |
if err != nil { | |
log.Fatal(err) | |
} | |
frd, err := os.Open("../data/q85.dictt.txt") | |
if err != nil { | |
log.Fatal(err) | |
} | |
defer frd.Close() | |
dec = gob.NewDecoder(frd) | |
dict := make(map[string]int) | |
err = dec.Decode(&dict) | |
if err != nil { | |
log.Fatal(err) | |
} | |
vSpain := mat.NewVecDense(len(proj.RawRowView(dict["Spain"])), proj.RawRowView(dict["Spain"])) | |
vMadrid := mat.NewVecDense(len(proj.RawRowView(dict["Madrid"])), proj.RawRowView(dict["Madrid"])) | |
vAthens := mat.NewVecDense(len(proj.RawRowView(dict["Athens"])), proj.RawRowView(dict["Athens"])) | |
vTarget := new(mat.VecDense) | |
vTarget.SubVec(vSpain, vMadrid) | |
vTarget.AddVec(vTarget, vAthens) | |
css := make([]CosineSimilarity, 0) | |
for w, i := range dict { | |
v := proj.RowView(i) | |
cosine := cos(vTarget, v) | |
if !math.IsNaN(cosine) { | |
css = append(css, CosineSimilarity{ | |
word: w, | |
value: cosine, | |
}) | |
} | |
} | |
sort.Slice(css, func(i, j int) bool { | |
return css[i].value > css[j].value | |
}) | |
for i, cs := range css { | |
if i > 9 { | |
break | |
} | |
fmt.Println(i+1, " ", cs.word, ":", cs.value) | |
} | |
} | |
func cos(a, b mat.Vector) float64 { | |
return mat.Dot(a, b) / (math.Sqrt(mat.Dot(a, a)) * math.Sqrt(mat.Dot(b, b))) | |
} |
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