Created
February 12, 2021 20:11
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import ( | |
"log" | |
"math/rand" | |
"testing" | |
"github.com/montanaflynn/stats" | |
"gonum.org/v1/gonum/floats" | |
) | |
func TestMidCardinalitySimulation(t *testing.T) { | |
rnd := rand.New(rand.NewSource(1)) | |
zipf := rand.NewZipf(rnd, 1.1, 1, 1000) | |
var vs []float64 | |
for k := 0; k < 1000; k++ { | |
var sums []float64 | |
used := make(map[uint64]bool) | |
for j := 0; j < 7; j++ { | |
var vs []float64 | |
for len(used) < (j+1)*125 { | |
v := zipf.Uint64() | |
_, ok := used[v] | |
if !ok { | |
vs = append(vs, float64(v)) | |
used[v] = true | |
} | |
} | |
sum, _ := stats.Sum(vs) | |
sums = append(sums, sum) | |
} | |
lastSum := uint64(0) | |
for v := uint64(0); v < 1000; v++ { | |
_, ok := used[v] | |
if !ok { | |
lastSum += v | |
} | |
} | |
sums = append(sums, float64(lastSum)) | |
vs = append(vs, floats.Min(sums)/floats.Max(sums)) | |
} | |
data := stats.Float64Data(vs) | |
mean, err := stats.Mean(data) | |
if err != nil { | |
log.Fatal(err) | |
} | |
sdev, err := stats.StdDevS(data) | |
if err != nil { | |
log.Fatal(err) | |
} | |
log.Printf("mean: %f, stddev: %f, max: %f", mean, sdev, floats.Max(vs)) | |
} |
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