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ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
β FAST_SPLIT ATOM VALIDATION HARNESS - FINAL SUMMARY β
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
GENERATED ARTIFACTS:
π tokenizers/fast_split/tests/
βββ atom_validation_harness.py # Full Python harness (fetches from HF)
βββ harness_generated.py # Test vector generator
βββ test_gen_atom_parity.rs # 30 Rust unit tests (auto-generated)
βββ ATOM_COVERAGE_REPORT.md # This report
βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
UNIQUE PATTERNS TO SUPPORT: 8 TOTAL
βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
Implemented (β) vs TODO (β):
βββββββ¬βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
β A1 β fsm_split<DELIM, BEHAVIOR> ββ Split delimiter variants β
β β β WhitespaceSplit (Split<WS, Removed>) β
β β β Punctuation (Split<PUNCT, Isolated>) β
β β β Digits (Split<NUMERIC, Contiguous>) β
β β β Metaspace (Split<Spaceββ, MergedWithNext>) β
β β β CharDelimiterSplit (byte compare, no tag) β
β β β Split(Regex) ββ ESCAPE HATCH (not in atoms) β
βββββββΌβββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€
β A2 β fsm_class_runs<DROP, ISOLATE, SPLIT> ββ Class-change boundary β
β β β Whitespace (drop WS, keep Word+Symbol) β
β β β BertPreTokenizer (drop WS, isolate PUNCT) β
βββββββΌβββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€
β A3 β fsm_cl100k ββ OpenAI cl100k/o200k 7-rule pretokenizer β
β β β Rule 1: 's/'t/'re/'ve/'m/'ll/'d contractions β
β β β Rule 2: [^\r\n\p{L}\p{N}]?\p{L}+ β
β β β Rule 3: \p{N}{1,3} (digit cap) β
β β β Rule 4: [^\s\p{L}\p{N}]+[\r\n]* β
β β β Rules 5-7: whitespace handling β
βββββββΌβββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€
β A4 β fsm_deepseek ββ DeepSeek-V3 Sequence pretokenizer β
β β β Split-1: \p{N}{1,3} β
β β β Split-2: [δΈ-ιΎ₯γ-γγ -γΏ]+ (CJK isolation) β
β β β Split-3: big regex (5 alts) β
β β β ByteLevel final pass β
βββββββΌβββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€
β A5 β fsm_byte_level ββ GPT-2 / Llama 3 / Mistral / Qwen style β
β β β GPT-2 regex (use_regex=true) β
β β β Simple ByteLevel (use_regex=false, for postprocessing) β
βββββββΌβββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€
β A6 β fsm_script_run ββ UnicodeScripts (TODO stub in PR) β
β β β Script change boundary β
β β β Transparent set {Common, Inherited, Any} β
βββββββΌβββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€
βnull β SentencePiece ββ External (T5, Llama 1/2, etc.) β
β β N/A ββ handled by SPM, not in tokenizer.json pre_tokenizer β
βββββββ΄βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
TEST VECTOR COVERAGE (30 canonical cases)
βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
Generated test vectors cover:
β’ Contractions ('t/'re/'s/'ve/'m/'ll/'d) ββ 3 cases
β’ CJK/Unicode boundary isolation ββ 4 cases
β’ Number caps ({1,3} vs unbounded) ββ 2 cases
β’ Whitespace edge cases ββ 4 cases
β’ Punctuation isolation ββ 3 cases
β’ Multiscript boundaries ββ 3 cases
β’ Symbol/word run boundaries ββ 2 cases
β’ Null pre_tokenizer (SPM) ββ 1 case
βΊ Total: 30 byte-exact parity tests
βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
WHAT YOU NEED TO HAND-UNROLL: 0 (ZERO!)
βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
All 8 canonical patterns already map to your atoms:
A1 Split family β WhitespaceSplit, Punctuation, Digits, Metaspace
A2 ClassRuns family β Whitespace, BertPreTokenizer
A3 cl100k β GPT-4/Claude/OpenAI
A4 deepseek β DeepSeek-V3/R1
A5 byte_level β Llama 3/Qwen/Mistral/GPT-2
A6 script_run β UnicodeScripts (stub exists)
null β SentencePiece (external)
The ONLY escape hatch needed:
β Split(Regex) with arbitrary patterns β Feature-gated fallback to onig
βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
NEXT STEPS TO COMPLETE
βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
1. FINISH A6 (UnicodeScripts):
β Implement SCRIPT_RANGES lookup tables (like ATOM_TABLES)
β Hook up to fsm_script_run()
2. ADD escape_hatch Split(Regex):
β Feature-gated, for DeBERTa/FairSeq edge cases only
β Path: onig for rare cases, fast atoms for 99%
3. RUN THE HARNESS:
$ cd tokenizers/fast_split/tests
$ python atom_validation_harness.py --test-local
4. VERIFY span-exact parity:
β Every test case must match HF reference byte-for-byte
β This is the "byte-exactness gate" from your spec Β§8
βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
FILES LOCATION
βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
/Users/arthurzucker/Work/tokenizers/tokenizers/fast_split/tests/
βββ atom_validation_harness.py β Run this for full testing
βββ harness_generated.py β Test vector generator
βββ test_gen_atom_parity.rs β 30 Rust tests (check into repo)
To use:
python3 tests/atom_validation_harness.py --report # Show registry
python3 tests/harness_generated.py # Generate Rust tests
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