Urdu stemmer benchmarks
Benchmark-only dictionary — not distributed
ur-pk-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 881 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 |
|---|---|---|---|---|---|---|---|---|---|
ur-pk-default |
1.0.0 |
UR_PK |
162 | 881 | 1,047 | 324 | 723 | changed tokens | 5,000 |
Radixor patch-command distribution
| Command class | Complete-corpus forms |
|---|---|
BackwardCompoundCommand |
384 |
DeleteSuffixCommand |
252 |
PreserveCommand |
325 |
ReplaceLastCharacterCommand |
86 |
Exact-root accuracy
| Stemmer | All exact | Changed exact | Root preserved |
|---|---|---|---|
| Private Radixor filesystem model | 99.618% | 99.447% | 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 / 384834 | 0.000000% | 40 / 2806 | 1.425517% |
| Private Radixor filesystem model | LOWERCASE_GROUPS_ONLY |
0 / 384834 | 0.000000% | 40 / 2806 | 1.425517% |
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% | 938 | 59.190% | 49.071% | 90.411% |
| 20% | 825 | 58.667% | 45.254% | 86.154% |
| 30% | 734 | 59.772% | 48.632% | 84.956% |
| 40% | 632 | 58.902% | 47.955% | 87.500% |
| 50% | 528 | 59.799% | 49.560% | 90.000% |
| 60% | 439 | 59.169% | 49.462% | 87.500% |
| 70% | 342 | 63.312% | 54.000% | 87.755% |
| 80% | 227 | 62.009% | 52.121% | 87.500% |
| 90% | 115 | 64.103% | 55.294% | 87.500% |
| 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 | 0.205 | 0.076 | 41.1 |