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// Command windowoverlap reports how much the RDD estimation windows of different
// alignment levels contain the same tokens.
//
// The window is a slice of vocabulary-id space, so each alignment puts different
// tokens in it. If the windows overlap little, the bias estimator is reading a
// largely different token population for each tokenizer, which bears on whether
// their estimates are comparable.
//
// Membership depends only on the counterfactual vocabulary and its merges, so
// this runs in seconds and never touches the corpus.
package main
import (
"encoding/csv"
"flag"
"fmt"
"log"
"os"
"strconv"
"go.jknobloc.com/x/research/knobloch"
"go.jknobloc.com/x/shelf"
"go.jknobloc.com/x/tokenizer/bpe"
)
var alphas = []int{0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100}
func name(alpha int, inverted bool) string {
if inverted {
return fmt.Sprintf("mi%03d", alpha)
}
return fmt.Sprintf("m%03d", alpha)
}
func set(v []string) map[string]struct{} {
s := make(map[string]struct{}, len(v))
for _, x := range v {
s[x] = struct{}{}
}
return s
}
// share of a that is also in b
func overlap(a []string, b map[string]struct{}) float64 {
if len(a) == 0 {
return 0
}
n := 0
for _, x := range a {
if _, ok := b[x]; ok {
n++
}
}
return 100 * float64(n) / float64(len(a))
}
type entry struct {
name string
alignment string
observed []string
oov []string
}
func main() {
ctrl := flag.String("ctrl", "results/knobloch/minipile_19_ctrl/%s_minipile", "counterfactual tokenizer directory, %s is the alignment name")
cutoff := flag.Int("cutoff", 50256, "RDD cutoff")
window := flag.Int("window", 5000, "half-width of the estimation window in token ids")
out := flag.String("out", "window_overlap.csv", "output CSV")
flag.Parse()
knobloch.LesciCutoff = *cutoff
knobloch.LesciWindow = *window
log.Printf("cutoff %d, window ids [%d, %d)", *cutoff, *cutoff-*window, *cutoff+*window)
var entries []entry
for _, inv := range []bool{false, true} {
for _, a := range alphas {
n := name(a, inv)
dir := shelf.Item(fmt.Sprintf(*ctrl, n))
tok, err := bpe.NewTokenizerFromFiles(
shelf.Abs(dir+"/vocab.json"), shelf.Abs(dir+"/merges.txt"),
bpe.Config{Recover: false})
if err != nil {
log.Fatal(err)
}
obs, oov := knobloch.WindowTokens(tok)
entries = append(entries, entry{n, fmt.Sprintf("%.1f", float64(a)/100), obs, oov})
}
}
// whole-window membership, ignoring which side of the cutoff a token landed
// on, plus the side-matched version; the gap between them is tokens that are
// in both windows but have crossed the cutoff
all := func(e entry) []string { return append(append([]string{}, e.observed...), e.oov...) }
interAll := set(all(entries[0]))
interObs := set(entries[0].observed)
interOOV := set(entries[0].oov)
for _, e := range entries[1:] {
cur := set(all(e))
for t := range interAll {
if _, ok := cur[t]; !ok {
delete(interAll, t)
}
}
cur = set(e.observed)
for t := range interObs {
if _, ok := cur[t]; !ok {
delete(interObs, t)
}
}
cur = set(e.oov)
for t := range interOOV {
if _, ok := cur[t]; !ok {
delete(interOOV, t)
}
}
}
baseAll := set(all(entries[0]))
baseObs := set(entries[0].observed)
baseOOV := set(entries[0].oov)
log.Printf("intersection across %d tokenizers: %d whole window, %d observed, %d oov",
len(entries), len(interAll), len(interObs), len(interOOV))
file, err := os.Create(*out)
if err != nil {
log.Fatal(err)
}
defer file.Close()
w := csv.NewWriter(file)
if err := w.Write([]string{
"tokenizer", "alignment", "cutoff", "window",
"n_window", "n_observed", "n_oov",
"window_shared_base", "window_shared_all",
"observed_shared_base", "oov_shared_base",
"observed_shared_all", "oov_shared_all",
}); err != nil {
log.Fatal(err)
}
for _, e := range entries {
if err := w.Write([]string{
e.name, e.alignment, strconv.Itoa(*cutoff), strconv.Itoa(*window),
strconv.Itoa(len(e.observed) + len(e.oov)),
strconv.Itoa(len(e.observed)), strconv.Itoa(len(e.oov)),
strconv.FormatFloat(overlap(all(e), baseAll), 'f', 2, 64),
strconv.FormatFloat(overlap(all(e), interAll), 'f', 2, 64),
strconv.FormatFloat(overlap(e.observed, baseObs), 'f', 2, 64),
strconv.FormatFloat(overlap(e.oov, baseOOV), 'f', 2, 64),
strconv.FormatFloat(overlap(e.observed, interObs), 'f', 2, 64),
strconv.FormatFloat(overlap(e.oov, interOOV), 'f', 2, 64),
}); err != nil {
log.Fatal(err)
}
}
w.Flush()
if err := w.Error(); err != nil {
log.Fatal(err)
}
log.Printf("wrote %s", *out)
}
|
