func BenchmarkCountMinSketchAdd(b *testing.B) {
k := 100
khh := itemset.NewKHHCountMinSketch(k)
for i := 0; i < b.N; i++ {
khh.Add(rand.Int63())
}
}
func TestCountMinSketchGetTop(t *testing.T) {
var rangeOfValues = 100
k := 10
khh := itemset.NewKHHCountMinSketch(k)
for i := 1; i < rangeOfValues; i++ {
for j := 1; j < i; j++ {
khh.Add(int64(i % rangeOfValues))
}
}
//expected result [99 98 97 96 95 ect]
//There is a bug here
counts := khh.GetCounts()
for i, value := range khh.GetTop() {
//Due to initilization the time each number is entered is one less than the number itself
if counts[i] != (value - 1) {
t.Errorf("The count for element %v was not correct. Expected %v, Actual %v.", i, (value - 1), counts[i])
}
}
var previousValue = khh.GetTop()[0] - 1 // initilize to expected value so first loop doesn't fail
//since each value is entered onece more than the previous value the minqueue
//should be the last k values entered, in acesnding order, ending with the max value, 99.
for i, value := range khh.GetTop() {
if value != (previousValue + 1) {
t.Errorf("The element at %v was not the expected value. Expected %v, Actual %v.", i, (previousValue + 1), value)
}
previousValue = value
}
if khh.GetTop()[len(khh.GetTop())-1] != 99 {
t.Errorf("The top count was not the correct the correct value. Expected %v, Actual %v", 99, khh.GetTop()[len(khh.GetTop())-1])
}
}
func TestCountMinSketchCounts(t *testing.T) {
var numToAdd = 10000
var rangeOfValues = 100
k := 100
khh := itemset.NewKHHCountMinSketch(k)
for i := 1; i < numToAdd; i++ {
khh.Add(int64(i % rangeOfValues))
}
var counts = khh.GetCounts()
for count := range counts {
// Count Min Sketch gaurentees that the count it returns for any value will be equal to or greater than the actual value
if counts[count] > int64(numToAdd/rangeOfValues) {
t.Errorf("All values in the count min sketch should be greater than or equal to the actual value. \n"+
"Actual value was %d, but returned value for entry %d was %d.", numToAdd/rangeOfValues, count, counts[count])
}
}
}
func NewCountMinSketch(k int) types.CountItemSet {
return itemset.NewKHHCountMinSketch(k)
}