---
license: mit
language:
  - en
  - de
tags:
  - g2p
  - grapheme-to-phoneme
  - ipa
  - text-to-speech
pretty_name: Crane G2P Test Fixtures
---

# G2P Test Fixtures

Held-out word-to-IPA test sets for evaluating grapheme-to-phoneme accuracy,
used by [Crane](https://github.com/cryptomilk/Crane)'s test suite and
benchmarks. These are static test fixtures, not runtime model assets.

## Files

| File | Language | Entries | Description |
|------|----------|---------|--------------|
| `g2p/en_us/test.tsv` | English (US) | 5000 | Held-out word-IPA pairs for CER benchmarking |
| `g2p/de_de/test.tsv` | German | 5000 | Held-out word-IPA pairs for CER benchmarking |
| `g2p/kokoro_vocab.json` | n/a | 114 | Kokoro phoneme vocabulary (char → token ID) used by the normalizer correctness benchmark |
| `g2p/en_us/kokoro_normalizer_ref.tsv` | English (US) | 71 | Raw IPA → expected (`en_us`, Kokoro) normalized IPA + phoneme IDs, for `IpaNormalizer` regression testing |
| `g2p/de_de/kokoro_normalizer_ref.tsv` | German | 32 | Raw IPA → expected (`de`, Kokoro) normalized IPA + phoneme IDs, for `IpaNormalizer` regression testing |

## Format

`g2p/en_us/test.tsv` and `g2p/de_de/test.tsv`: tab-separated, two columns,
UTF-8, no header row, sorted alphabetically:

```
word<TAB>IPA
```

Example:

```
abandons	əbˈændənz
```

`g2p/en_us/kokoro_normalizer_ref.tsv` and `g2p/de_de/kokoro_normalizer_ref.tsv`:
tab-separated, three columns, UTF-8, no header row:

```
raw_ipa<TAB>expected_normalized_ipa<TAB>expected_phoneme_ids
```

`expected_phoneme_ids` is a comma-separated list of `i64` token IDs, with a
`0` (pad/BOS) prepended and appended, matching Moonshine's
`phoneme_str_to_input_ids()`. Example:

```
tˈiːtʃɚ	tˈiːʧəɹ	0,62,156,51,158,133,83,123,0
```

`g2p/kokoro_vocab.json`: a flat JSON object mapping each phoneme character to
its integer token ID, e.g. `{"a": 43, "ˈ": 156, ...}`.

## Provenance

`g2p/en_us/test.tsv` is a 5000-entry random sample (seed 42, no replacement)
from Moonshine Voice's (https://github.com/moonshine-ai/moonshine, MIT
license) English IPA lexicon, which is itself derived from the CMU
Pronouncing Dictionary (https://github.com/cmusphinx/cmudict, BSD-style
license). These entries are held out and never seen by the G2P engine
during lexicon construction.

`g2p/de_de/test.tsv` is a 5000-entry random sample (seed 42, no replacement,
one pronunciation per word) from Moonshine Voice's German IPA lexicon
(MIT-licensed multilingual IPA dictionary data), deduplicated to unique
words before sampling since the source lexicon has multiple pronunciation
rows for some words. These entries are held out and never seen by the G2P
engine during lexicon construction.

`g2p/kokoro_vocab.json` is copied verbatim from Moonshine Voice's
`core/moonshine-tts/data/kokoro/config.json` `vocab` object (114 entries;
the HuggingFace `onnx-community/Kokoro-82M-v1.0-ONNX` export used by Crane's
`kokoro_tts` module has the same 114 entries plus one extra, `$`, which does
not affect this normalizer's behavior).

`g2p/en_us/kokoro_normalizer_ref.tsv` combines the first 50 lines of Moonshine's
own golden English G2P output
(`core/moonshine-tts/tests/data/en_us/rule_g2p_wiki_100.txt`) with 21
hand-crafted edge cases (empty/whitespace-only input, each of the 12
diphthong/affricate/rhotic replacements in isolation, unknown-codepoint
dropping, non-ASCII whitespace collapsing). Expected output was generated by
an independent Python reimplementation of Moonshine's
`normalize_ipa_to_kokoro()` and `phoneme_str_to_input_ids()`
(`moonshine-tts.cpp`), not by running the C++ itself — the 12 replacement
pairs and the vocab-filter/whitespace-collapse logic are simple enough that
this port only needs `str.replace`, `str.strip`, and Python's
`unicodedata.normalize("NFC", ...)`.

`g2p/de_de/kokoro_normalizer_ref.tsv` combines 6 realistic German lexicon
entries sampled from `g2p/de_de/test.tsv` (single words plus one 2-word
combination, chosen to exercise both plain lexicon passthrough and the
affricate/geminate/`ʏ` replacements together with dropped combining
diacritics) with 26 hand-crafted edge cases (each
`DE_EXTRA_KOKORO_REPLACEMENTS` pair in isolation, shared
affricate/diphthong passthrough under `"de"`, German phonemes with no
replacement needed, syllabic-consonant and non-syllabic-offglide diacritic
dropping, unknown-codepoint dropping, and whitespace handling). Expected
output was hand-derived by applying
`SHARED_KOKORO_REPLACEMENTS`/`DE_EXTRA_KOKORO_REPLACEMENTS` and the
vocab-filter/whitespace-collapse algorithm against `g2p/kokoro_vocab.json`
directly, then cross-checked by running the real `IpaNormalizer` and
confirming an exact match — not authored by trusting `normalize()`'s own
output as ground truth.

## License

Both upstream sources use permissive, MIT-compatible licenses:

- Moonshine Voice: MIT license.
- CMU Pronouncing Dictionary: BSD-style license, Copyright (C) 1993-2015
  Carnegie Mellon University. Full text:
  https://github.com/cmusphinx/cmudict/blob/master/LICENSE