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
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
// Copyright 2020 Nick White.
// Use of this source code is governed by the GPLv3
// license that can be found in the LICENSE file.
package main
import (
"flag"
"fmt"
"log"
"math/rand"
"os"
"path"
"path/filepath"
"sort"
"strings"
)
const usage = `Usage: pare-gt [-n num] gtdir movedir
Moves some of the ground truth from gt-dir into movedir,
ensuring that the same proportions of each ground truth
source are represented in the moved section. Proportion of
ground truth source is calculated by taking the prefix of
the filename up to the first '-' character.
`
// Prefixes is a map of the prefix string to a list of filenames
type Prefixes = map[string][]string
// walker adds any .txt path to prefixes map, under the appropriate
// prefix (blank if no '-' separator was found)
func walker(prefixes *Prefixes) filepath.WalkFunc {
return func(fpath string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() {
return nil
}
ext := path.Ext(fpath)
if ext != ".txt" {
return nil
}
base := path.Base(fpath)
idx := strings.Index(base, "-")
var prefix string
if idx > -1 {
prefix = base[0:idx]
}
noext := strings.TrimSuffix(fpath, ext)
(*prefixes)[prefix] = append((*prefixes)[prefix], noext)
return nil
}
}
// inStrSlice checks whether a given string is part of a slice of
// strings
func inStrSlice(sl []string, s string) bool {
for _, v := range sl {
if s == v {
return true
}
}
return false
}
// samplePrefixes selects random samples for each prefix, proportional
// to the amount of that prefix there are in the whole set, so that a
// total of perctosample% are sampled.
func samplePrefixes(perctosample int, prefixes Prefixes) (filestomove []string) {
var total, sample int
var keys []string
for i, v := range prefixes {
total += len(v)
// needed for determinism
sort.Strings(prefixes[i])
keys = append(keys, i)
}
sample = (total * perctosample) / 100
// This ensures the map is looped over deterministically
sort.Strings(keys)
for _, key := range keys {
prefix := prefixes[key]
len := len(prefix)
if len == 1 {
continue
}
numtoget := int(float64(sample) / float64(total) * float64(len))
if numtoget >= len {
numtoget = len - 1
}
if numtoget < 1 {
numtoget = 1
}
for i := 0; i < numtoget; i++ {
var selected string
selected = prefix[rand.Int()%len]
// pick a different random selection if the first one is
// already in the filestomove slice
for inStrSlice(filestomove, selected) {
selected = prefix[rand.Int()%len]
}
filestomove = append(filestomove, selected)
}
}
return
}
func main() {
flag.Usage = func() {
fmt.Fprintf(flag.CommandLine.Output(), usage)
flag.PrintDefaults()
}
numtopare := flag.Int("n", 10, "Percentage of the ground truth to pare away.")
flag.Parse()
if flag.NArg() != 2 {
flag.Usage()
os.Exit(1)
}
for _, d := range flag.Args() {
info, err := os.Stat(d)
if err != nil || !info.IsDir() {
log.Fatalln("Error accessing directory", flag.Arg(0), err)
}
}
var prefixes Prefixes
prefixes = make(Prefixes)
err := filepath.Walk(flag.Arg(0), walker(&prefixes))
if err != nil {
log.Fatalln("Failed to walk", flag.Arg(0), err)
}
filestomove := samplePrefixes(*numtopare, prefixes)
for _, f := range filestomove {
fmt.Println("Moving ground truth", f)
b := path.Base(f)
for _, ext := range []string{".txt", ".png"} {
err = os.Rename(f+ext, path.Join(flag.Arg(1), b+ext))
if err != nil {
log.Fatalln("Error moving file", f+ext, err)
}
}
}
}
|
