ghana-speech-eval

⚠️ Evaluation only. This is a held-out benchmark for measuring ASR quality on Ghanaian languages. Please do not train or fine-tune on it — doing so contaminates the benchmark and makes reported scores meaningless. Every subset ships a single eval split.

Multi-source ASR evaluation benchmark for Ghanaian languages. All subsets are 16 kHz mono with standardised schema (audio, text, language, country, length, iso, subset).

Source groups

Group	Description	Clip length	Per-language cap
bible_*	Bible-audio aligned (ghananlpcommunity/ghana-speech)	3–15 s	1 000
finance_*	Finance-domain multispeaker speech (ghanaopendata)	0–60 s	1 000
jw_*	JW.org speech (AfriSpeech v1)	3–15 s	1 000
lds_*	LDS general-conference speech (multispeaker)	3–15 s	1 000
unicef_*	UNICEF health recordings	3–60 s	all available (~195–200)
waxal_*	WaxalNLP ASR (google/WaxalNLP)	3–30 s	1 000

Twi is split by dialect

Akuapem and Asante Twi are separate languages here, twi_akuapem and twi_asante. They were previously merged into a single twi (500/500 in bible_twi_twi and finance_twi), which made every Twi score an average over two orthographies: the Khaya API's Akuapem endpoint scored 8.9 % WER on the Akuapem-heavy bible split and 88.7 % on jw, and its general-Twi endpoint the reverse. The merged configs (bible_twi_twi, finance_twi, unicef_twi, jw_twi_twi) have been removed. jw_* remains for the other nine languages — its Twi audio mixes both dialects with no way to separate them.

Neither dialect has its own ISO 639-3 code (both are twi), so twi_akuapem and twi_asante are this dataset's keys, not ISO.

Two labels are our classification rather than the source's, and are stated here so they are not mistaken for ground truth:

• lds_Asante_Twi — the source is labelled only "Twi (Akan)"; its orthography (mfeɛ, afoforɔ) matches the verified Asante bible text.
• waxal_Asante_Twi — WaxalNLP labels this config aka / "Akan" without a dialect; it is filed under Asante Twi.

Configs (65 total)

bible_* — 42 configs

Config	ISO	Language	Clips
bible_Gikyode_acd	acd	Gikyode	1000
bible_Dangme_ada	ada	Dangme	1000
bible_Siwu_akp	akp	Siwu	1000
bible_Anyin_any	any	Anyin	1000
bible_Avatime_avn	avn	Avatime	1000
bible_Bissa_bib	bib	Bissa	1000
bible_Bimoba_bim	bim	Bimoba	1000
bible_Birifor_Southern_biv	biv	Birifor_Southern	1000
bible_Tuwuli_bov	bov	Tuwuli	1000
bible_Bassar_Ntcham_bud	bud	Bassar_Ntcham	1000
bible_Buli_bwu	bwu	Buli	1000
bible_Dagbani_dag	dag	Dagbani	1000
bible_Dagaare_dga	dga	Dagaare	1000
bible_Ewe_ewe	ewe	Ewe	1000
bible_Fante_fat	fat	Fante	1000
bible_Fulfulde_Maasina_ffm	ffm	Fulfulde_Maasina	1000
bible_Gonja_gjn	gjn	Gonja	1000
bible_Ninkare_gur	gur	Ninkare	1000
bible_Hausa_hau	hau	Hausa	1000
bible_Kabiye_kbp	kbp	Kabiye	1000
bible_Tem_kdh	kdh	Tem	1000
bible_Konni_kma	kma	Konni	1000
bible_Kusaal_kus	kus	Kusaal	1000
bible_Lelemi_lef	lef	Lelemi	1000
bible_Sekpele_lip	lip	Sekpele	1000
bible_Mampruli_maw	maw	Mampruli	1000
bible_Deg_mzw	mzw	Deg	1000
bible_Nawuri_naw	naw	Nawuri	1000
bible_Chumburung_ncu	ncu	Chumburung	1000
bible_Nkonya_nko	nko	Nkonya	1000
bible_Ntrubo_ntr	ntr	Ntrubo	1000
bible_Nzema_nzi	nzi	Nzema	1000
bible_Sehwi_sfw	sfw	Sehwi	1000
bible_Paasaal_sig	sig	Paasaal	1000
bible_Sisaala_Tumulung_sil	sil	Sisaala_Tumulung	1000
bible_Selee_snw	snw	Selee	1000
bible_Tampulma_tpm	tpm	Tampulma	1000
bible_Akuapem_Twi	twi_akuapem	Akuapem Twi	1000
bible_Asante_Twi	twi_asante	Asante Twi	1000
bible_Vagla_vag	vag	Vagla	1000
bible_Konkomba_xon	xon	Konkomba	1000
bible_Kasem_xsm	xsm	Kasem	1000

finance_* — 4 configs

Config	ISO	Language	Clips
finance_fante	fat	Fante	1000
finance_ga	gaa	Ga	1000
finance_Akuapem_Twi	twi_akuapem	Akuapem Twi	1000
finance_Asante_Twi	twi_asante	Asante Twi	1000

jw_* — 9 configs

Config	ISO	Language	Clips
jw_dangme_ada	ada	Dangme	261
jw_ahanta_aha	aha	Ahanta	1000
jw_dagaare_dga	dga	Southern Dagaare	1000
jw_ewe_ewe	ewe	Éwé	1000
jw_fante_fat	fat	Fante	1000
jw_ga_gaa	gaa	Ga	1000
jw_frafra_gur	gur	Farefare	1000
jw_nzema_nzi	nzi	Nzema	1000
jw_sehwi_sfw	sfw	Esahie	1000

lds_* — 2 configs

Config	ISO	Language	Clips
lds_Fante_fat	fat	Fante	1000
lds_Asante_Twi	twi_asante	Asante Twi	1000

unicef_* — 3 configs

Config	ISO	Language	Clips
unicef_dagbani	dag	Dagbani	195
unicef_ewe	ewe	Éwé	199
unicef_Asante_Twi	twi_asante	Asante Twi	196

waxal_* — 5 configs

Config	ISO	Language	Clips
waxal_Dagbani_dag	dag	Dagbani	1000
waxal_Dagaare_dga	dga	Dagaare	1000
waxal_Ewe_ewe	ewe	Ewe	1000
waxal_Ikposo_kpo	kpo	Ikposo	1000
waxal_Asante_Twi	twi_asante	Asante Twi	1000

Loading

from datasets import load_dataset

# every subset has a single `eval` split
ds = load_dataset("ghananlpcommunity/ghana-speech-eval", "bible_Asante_Twi", split="eval")

from datasets import get_dataset_config_names
print(get_dataset_config_names("ghananlpcommunity/ghana-speech-eval"))

Schema

Column	Type	Description
audio	Audio	16 kHz mono PCM
text	string	reference transcription (verbatim)
language	string	human-readable language label
country	string	ISO 3166-1 alpha-2, or ""
length	float64	clip duration in seconds
iso	string	language key (ISO 639-3, except the two Twi dialect keys)
subset	string	<group>_<label>, matching the config name

Built with speecheval-builder. Benchmarked by nsanku-ASR.

License

CC-BY-4.0. Respect the terms of each source dataset.