FLEURS-Trigram Whisper Base No-Language Checkpoint

Summary

This repository contains a Whisper checkpoint for Chichewa/Nyanja automatic speech recognition, fine-tuned from openai/whisper-base.

• Experiment type: fleurs-trigram
• Base model: openai/whisper-base
• Training condition: no_language
• Release artifact: full fine-tuned checkpoint selected from the best training checkpoint

Intended use

This checkpoint is intended for research and evaluation on Chichewa/Nyanja ASR. It is not a production-ready speech system and should be validated carefully before downstream use.

How to use

This repository contains a full fine-tuned checkpoint. It can be loaded directly with Transformers.

from transformers import AutoModelForSpeechSeq2Seq, AutoProcessor

model_id = "ai4good-labyrinth/fleurs-trigram-hours0p50-whisper-base-no-language"
processor = AutoProcessor.from_pretrained(model_id)
model = AutoModelForSpeechSeq2Seq.from_pretrained(model_id)

Training data

• Training source: FLEURS train + Chichewa Trigrams train
• Evaluation source during training: FLEURS dev
• Train examples before duration filtering: 15641
• Train examples after duration filtering: 15600
• Dev examples before duration filtering: 311
• Dev examples after duration filtering: 305
• Duration filter used during training: min_duration_seconds=0.0, max_duration_seconds=30.0

Training procedure

• Fine-tuning script: experiments/whisper_finetune/finetune_whisper.py
• Base model: openai/whisper-base
• Task: transcribe
• Language hint during training/evaluation: none, corresponding to --language auto in standalone evaluation
• Mixed precision: no
• Gradient checkpointing: False
• Selected checkpoint step: 5600
• Selected checkpoint epoch: 2.87

Training-time dev selection

The best checkpoint was selected using trainer-side dev evaluation on the duration-filtered FLEURS dev split.

• Dev WER: 0.6237
• Dev CER: 0.2353
• Dev loss: 0.8366

These values come from the training pipeline and may differ slightly from standalone post-hoc evaluation because the decoding path is not perfectly identical.

Evaluation protocol

Standalone evaluation is recommended for the final release. Filtered and unfiltered results should be reported separately.

• Filtered evaluation: min_duration_seconds=0, max_duration_seconds=30
• Unfiltered evaluation: no duration constraint
• Decoding task: transcribe
• Language hint: auto

Evaluation summary

Files in this repository

• Model weights and config: repository root
• Processor/tokenizer files: repository root
• Evaluation JSON files: eval/...

Known limitations

• Whisper does not provide an official Nyanja/Chichewa language token.
• Users must also comply with the upstream dataset licenses and any upstream model license obligations.
• Standalone evaluation and trainer-side evaluation can differ slightly even on the same split and duration filter.
• Cross-dataset results should be interpreted carefully because transcription conventions may differ across corpora.

Citation

If you use this checkpoint, please cite:

• the Whisper paper
• the FLEURS dataset
• this repository

@misc{fleurs_trigram_hours0p50_whisper_base_no_language_2026,
  title        = {FLEURS-Trigram Whisper Base No-Language Checkpoint},
  author       = {AI4Good Labyrinth Team},
  year         = {2026},
  howpublished = {\url{https://huggingface.co/ai4good-labyrinth/fleurs-trigram-hours0p50-whisper-base-no-language}},
  note         = {Whisper fine-tuning for Chichewa/Nyanja ASR}
}