Welsh stemmer benchmarks
Benchmark-only dictionary — not distributed
cy-gb-default is privately retained for reproducible measurement only. Radixor does not distribute, install, publish, register, or support this dictionary because file-applicable redistribution rights are unresolved. It has no Maven coordinates, BOM/catalog entry, standard-package membership, or Python package.
Evidence: Selected data file lacks file-applicable license evidence. Benchmarking these private bytes does not assert a right to redistribute them.
Dictionary size: . The exact count is 6,240 distinct usable word forms after parser-compatible filtering and exact case-preserved deduplication. Stars rank size among all 167 benchmarked dictionaries; they do not measure linguistic quality, availability, or benchmark accuracy.
The corpus, quality, generalization, and speed evidence below belongs to the private 2026-09-11 Radixor/Java 4.4.0 documentation snapshot. It is never placed on a production or release classpath.
Dictionary corpus
| Model ID | Private version | Language | Dictionary rows | Distinct usable forms | Complete tokens | Already-root | Changed | Timing workload | Timing tokens |
|---|---|---|---|---|---|---|---|---|---|
cy-gb-default |
1.0.0 |
CY_GB |
183 | 6,240 | 6,425 | 366 | 6,059 | changed tokens | 6,059 |
Radixor patch-command distribution
| Command class | Complete-corpus forms |
|---|---|
AppendCharacterCommand |
56 |
BackwardCompoundCommand |
4,278 |
DeleteSuffixCommand |
1,406 |
PreserveCommand |
366 |
ReplaceLastCharacterCommand |
319 |
Exact-root accuracy
| Stemmer | All exact | Changed exact | Root preserved |
|---|---|---|---|
| Private Radixor filesystem model | 99.969% | 99.967% | 100.000% |
Pairwise linguistic quality
OI and UI report over-stemming and under-stemming with raw numerators and denominators. A zero denominator is n/a.
| Stemmer | Dictionary mode | OI raw | OI | UI raw | UI |
|---|---|---|---|---|---|
| Private Radixor filesystem model | ALL_WORDS |
0 / 19354316 | 0.000000% | 78 / 111364 | 0.070041% |
| Private Radixor filesystem model | LOWERCASE_GROUPS_ONLY |
0 / 19354316 | 0.000000% | 78 / 111364 | 0.070041% |
Dictionary-family generalization
This frozen five-seed curve measures transfer to withheld lexical families; it does not establish redistribution or support status.
| Training rows | Median unseen occurrences | Unseen all exact | Unseen changed exact | Unseen root preserved |
|---|---|---|---|---|
| 10% | 5,768 | 11.486% | 7.127% | 89.091% |
| 20% | 5,107 | 15.960% | 11.854% | 82.192% |
| 30% | 4,456 | 21.430% | 17.788% | 81.250% |
| 40% | 3,828 | 24.115% | 20.552% | 82.727% |
| 50% | 3,196 | 25.487% | 22.226% | 83.516% |
| 60% | 2,567 | 27.346% | 23.509% | 83.562% |
| 70% | 1,954 | 30.061% | 26.902% | 83.636% |
| 80% | 1,327 | 30.671% | 27.694% | 81.081% |
| 90% | 647 | 33.965% | 31.538% | 83.333% |
| 100% | 0 | n/a | n/a | n/a |
Runtime timing
JMH average time uses 3 one-second warmup iterations, 5 one-second measurement iterations, 3 independent forks, and 1 thread.
| Benchmark | Score ms/op | Error ms | ns/token |
|---|---|---|---|
| Private Radixor filesystem model | 0.368 | 0.075 | 60.7 |