/
main.go
50 lines (41 loc) · 809 Bytes
/
main.go
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package main
import (
"flag"
"fmt"
"log"
"math/rand"
"os"
"runtime/pprof"
"time"
"github.com/willbeason/tdigest/pkg/tdigest"
)
var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
func main() {
flag.Parse()
if *cpuprofile != "" {
f, err := os.Create(*cpuprofile)
if err != nil {
log.Fatal(err)
}
err = pprof.StartCPUProfile(f)
if err != nil {
log.Fatal(err)
}
defer pprof.StopCPUProfile()
}
r := rand.New(rand.NewSource(time.Now().UnixNano()))
digest := tdigest.New(500)
for i := 0; i < 1e8; i++ {
val := r.Float64()
digest.Add(val)
}
fmt.Println(digest.String())
err := 0.0
for i := 0; i <= 10; i++ {
p := float64(i) / 10
q := digest.Quantile(p)
//fmt.Println(i, q)
err += (p - q) * (p - q)
}
fmt.Printf("SSE: %f\n", err)
}