-
Notifications
You must be signed in to change notification settings - Fork 245
/
libsvm_dataset_saver.go
46 lines (41 loc) · 997 Bytes
/
libsvm_dataset_saver.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
36
37
38
39
40
41
42
43
44
45
46
package contrib
import (
"bufio"
"fmt"
"github.com/huichen/mlf/data"
"log"
"os"
"strconv"
)
func SaveLibSVMDataset(path string, set data.Dataset) {
log.Print("保存数据集到libsvm格式文件", path)
f, err := os.Create(path)
defer f.Close()
if err != nil {
log.Fatalf("无法打开文件\"%v\",错误提示:%v\n", path, err)
}
w := bufio.NewWriter(f)
defer w.Flush()
iter := set.CreateIterator()
iter.Start()
for !iter.End() {
instance := iter.GetInstance()
if instance.Output.LabelString == "" {
fmt.Fprintf(w, "%d ", instance.Output.Label)
} else {
fmt.Fprintf(w, "%s ", instance.Output.LabelString)
}
for _, k := range instance.Features.Keys() {
// 跳过第0个特征,因为它始终是1
if k == 0 {
continue
}
if instance.Features.Get(k) != 0 {
// libsvm格式的特征从1开始
fmt.Fprintf(w, "%d:%s ", k, strconv.FormatFloat(instance.Features.Get(k), 'f', -1, 64))
}
}
fmt.Fprint(w, "\n")
iter.Next()
}
}