-
Notifications
You must be signed in to change notification settings - Fork 0
/
timestamp.go
35 lines (26 loc) · 1.14 KB
/
timestamp.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
package featuremill
// feature index determinestic by murmur32(uniqueHashPrefixStr+<user field>+<interval>)
import (
"fmt"
"github.com/araddon/dateparse"
"github.com/spaolacci/murmur3"
)
// ExtractTimestamp returns a slice of 3 scaled seasonality vectors: minute of hour, hour of day, day of week
// each with a deterministic feature ID
func ExtractTimestamp(field, timestamp string) ([]string, error) {
var out []string
dt, err := dateparse.ParseAny(timestamp)
if err != nil {
return out, err
}
dayOfWeek := int(dt.Weekday())
dayOfWeekFeatureID := int32(murmur3.Sum32([]byte(uniqueHashPrefixStr + field + "dayOfWeek")))
out = append(out, fmt.Sprintf("%d:%f", dayOfWeekFeatureID, float32(dayOfWeek)/6))
hourOfDay := dt.Hour()
hourOfDayFeatureID := int32(murmur3.Sum32([]byte(uniqueHashPrefixStr + field + "hourOfDay")))
out = append(out, fmt.Sprintf("%d:%f", hourOfDayFeatureID, float32(hourOfDay)/23))
minuteOfHour := dt.Minute()
minuteOfHourFeatureID := int32(murmur3.Sum32([]byte(uniqueHashPrefixStr + field + "minuteOfHour")))
out = append(out, fmt.Sprintf("%d:%f", minuteOfHourFeatureID, float32(minuteOfHour)/59))
return out, nil
}