whisper-small-eu-acft-ggml

whisper-small-eu-acft-ggml

Basque voice input model for FUTO Keyboard — a whisper.cpp GGML q8_0 .bin you import directly into the app. No fork or recompile needed.

Install in FUTO Keyboard

1. Download small_eu_acft_q8_0.bin (~264 MB).
2. Open the file with FUTO Keyboard — from your file manager or browser download, choose "Open with → FUTO Keyboard".
   • Alternative: FUTO Keyboard → Settings → Languages → Import from file.
3. When prompted, associate the model with Basque (eu).
4. Done. Tap the microphone key and dictate in Basque.

FUTO's importer detects the ggml magic bytes, copies the file to voiceinput_eu.bin, and loads it with dynamic audio_ctx. Re-importing overwrites the previous model.

Prerequisite: Basque must be enabled as a keyboard language (Settings → Languages → add Euskara/eu).

Why ACFT?

FUTO Voice Input runs whisper.cpp with dynamic audio_ctx: it encodes only the real audio length instead of zero-padding every clip to 30 s. A standard Whisper model loops / repeats forever under dynamic context. This model is fine-tuned with ACFT (Audio Conditional Fine-Tuning, futo-org/whisper-acft) so it stays robust to context truncation while preserving Basque accuracy.

Validation

Tested with whisper-cli using dynamic audio_ctx (-ac N matched to clip length) — the same condition FUTO's runtime uses. Reference is the ground truth transcript from the HiTZ/composite_corpus_eu_v2.1 test_cv split; Output is what whisper-cli -ac N transcribed. All three clips terminate cleanly (a non-ACFT model loops/repeats forever under dynamic context):

Clip 1 is slightly garbled (garrantzi handia → garrantzen biazuen), but the key point for ACFT is that all three clips transcribe coherently and terminate under dynamic context.

Transformer-space WER (composite corpus test_cv, N=50 samples, same split as the clips above):

Dynamic-ctx WER is within 0.28 of full-ctx — no degradation, no looping.

Related

• HF checkpoint (safetensors, for inference / retraining): itzune/whisper-small-eu-acft
• Source model (Basque language fine-tune): xezpeleta/whisper-small-eu