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-rw-r--r--pare-gt/main.go133
1 files changed, 133 insertions, 0 deletions
diff --git a/pare-gt/main.go b/pare-gt/main.go
new file mode 100644
index 0000000..d07e141
--- /dev/null
+++ b/pare-gt/main.go
@@ -0,0 +1,133 @@
+package main
+
+import (
+ "flag"
+ "fmt"
+ "log"
+ "math/rand"
+ "os"
+ "path"
+ "path/filepath"
+ "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
+}
+
+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)
+ }
+
+ var total, sample int
+ for _, v := range prefixes {
+ total += len(v)
+ // fmt.Printf("\n%s:\n%s\n", i, v)
+ }
+
+ sample = total / *numtopare
+
+ // filestomove contains the names of files to move minus file extension
+ var filestomove []string
+
+ // select random samples for each prefix, proportional to
+ // the amount of that prefix there are in the whole set
+ for _, prefix := range prefixes {
+ len := len(prefix)
+ if len == 1 {
+ continue
+ }
+ numtoget := int(float64(sample) / float64(total) * float64(len))
+ 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)
+ }
+ }
+
+ 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)
+ }
+ }
+ }
+}