VoxCPM2 Arabic: dialect adapters vs teacher-v1 vs teacher-v2
24 held-out sentences, each read by three models with the same reference voice, text and seed. Every row has one audio
column per model, to listen to side by side.
At a glance
What
24 rows × 3 generated audios + the reference voice
Dialects
all 17
Selection
the first held-out sentence of each dialect, plus a second one for bahraini, gulf, hejazi, iraqi, msa, najdi and saudi, where the models differ most; not chosen by quality
Decoding
original LocDiT (10 steps, CFG), bf16, voice cloning from reference audio only
CC BY-NC-SA 4.0 (the references include SADA clips)
Columns
column
content
id, dialect, text
row id, dialect, the sentence
reference
the voice being cloned (a held-out speaker of that dialect)
current_adapters
VoxCPM2 + the 11 dialect LoRA adapters; base VoxCPM2 for msa, sudanese, yemeni, algerian, moroccan, tunisian, libyan (no adapter)
teacher_v1
one model for 17 dialects (dialect tag), 642 h of real speech, LoRA on every module
teacher_v2
one model for 17 dialects, 103 h of filtered real + 32 h of filtered synthetic speech, LoRA on the language model only
cer_*, utmos_*
per model: CER (better of Whisper large-v3 and Cohere Transcribe Arabic, after Arabic normalization) and UTMOS (1-5)
Whole evaluation set (1020 clips, 17 dialects)
CER
WER
UTMOS
speaker sim
dialect region
current adapters
4.9 %
15.0 %
2.48
0.94
64 %
teacher-v1
7.1 %
19.1 %
2.34
0.94
69 %
teacher-v2
4.8 %
14.6 %
2.35
0.95
64 %
The hejazi, najdi, gulf and msa references are TV-drama clips (SADA) with reverberation and music. teacher-v2 keeps
more of that sound than the adapters, which is most of its UTMOS gap.
Rows
#
dialect
sentence
CER adapters / v1 / v2
UTMOS adapters / v1 / v2
0
bahraini
والعكس أيضا، الشركات الأمريكية اللي ما تهني، تب هي تستفيد إن…
3.1 / 13.7 / 2.3 %
2.43 / 2.34 / 2.33
1
bahraini
إنه يبين في ألفان و خمسون، يمكن توصل الارتفاع في درجة حرارة …
17.6 / 18.7 / 17.6 %
2.44 / 2.63 / 2.46
2
algerian
واللي ڨد ما يجاوب يغلط في الإجابة، وكانو الشباب هذم فقراء مس…
5.3 / 5.3 / 5.3 %
2.59 / 2.71 / 2.35
3
egyptian
بأعتقد إن الماسونية والأفكار الغريبة دي مخالفة لمجتمعنا وبلد…
0.0 / 1.1 / 0.0 %
2.73 / 3.08 / 3.2
4
hejazi
يا جدو سرحان يا جدو سرحان ليه القسوة هذي كلها إنت ما كنت كده
1.7 / 11.7 / 26.7 %
2.24 / 1.41 / 1.55
5
hejazi
أ وخصوصا إنه ما في أي حاجة ضده، حتى الأجهزة الأمنية إللي في …
2.4 / 6.0 / 3.6 %
1.99 / 1.37 / 1.79
6
iraqi
استمر الحال الموضوع فترة طويلة يعني، عادي تروح وترجع إنه أمي…
CC BY-NC-SA 4.0, non-commercial. The references are held-out clips of the lahgtna and SADA corpora (SADA: CC BY-NC-SA
4.0); the audio was generated with VoxCPM2 (Apache-2.0). The newer Teacher-v3 is not in this set.