RafatK/Whisper_Largev2-Swahili-Decodis_Base

🧠 High-Accuracy ASR Model for Swahili for Clean Speech

This automatic speech recognition (ASR) model is trained using open multilingual datasets to provide high-accuracy transcription for clean, read-aloud Swahili speech.

It is ideal for tasks involving clean and well-structured and clean speech input, such as reading assistants, or general-purpose multilingual transcription.

This model is part of a full ASR ablation study that analyzes and understands the robustness of data and in dealing with different modes and variations of data collections. 👉 View all models on GitHub

We are particularly interested in validating the conclusions we’ve observed through our ablation studies:

While benchmark datasets like FLEURS are useful for comparison, they do not fully capture the variability and challenges of real-world speech — especially for underrepresented languages like Swahili and Yoruba. We are inviting the community to try out these models and help assess:

1. How well the models perform on natural, conversational, or noisy audio
2. Open-source datasets (like Common Voice & FLEURS) perform well on clean, benchmark speech.
3. Whether the improvements we've seen in combining diverse datasets generalize to your use case
4. Gaps between benchmark results and real-world usability
5. A combination of both yields balanced results but depends on data quality and label accuracy.

Model

Whisper is a general-purpose speech recognition model. It is trained on a large dataset of diverse audio and is also a multitasking model that can perform multilingual speech recognition, speech translation, and language identification.

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🚀 How to Use

from transformers import WhisperForConditionalGeneration, WhisperProcessor
from transformers import pipeline
from transformers.utils import is_flash_attn_2_available

processor = WhisperProcessor.from_pretrained("openai/whisper-large-v2")
model = WhisperForConditionalGeneration.from_pretrained("RafatK/Whisper_Largev2-Swahili-Decodis_Base", torch_dtype=torch.float16).to("cuda")
model.generation_config.input_ids = model.generation_config.forced_decoder_ids
model.generation_config.forced_decoder_ids = None

pipe = pipeline(
  "automatic-speech-recognition",
  model=model,
    processor = "openai/whisper-large-v2",
    tokenizer = "openai/whisper-large-v2",
    feature_extractor = "openai/whisper-large-v2",
  chunk_length_s=15,
  device=device,
  model_kwargs={"attn_implementation": "flash_attention_2"} if is_flash_attn_2_available() else {"attn_implementation": "sdpa"},
  generate_kwargs = {
                       'num_beams':5,
                       'max_new_tokens':440,
                       'early_stopping':True,
                        'repetition_penalty': 1.8,
                       'language': 'swahili',
                       'task': 'transcribe'
                       }
)
text_output = pipe("audio.wav")['text']

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📊 Total Duration: ~400 hours

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📁 Languages: Swahili (sw)

🏋️‍♂️ Training Setup

• Architecture: whisper-large-v2
• Framework: Whisper and Huggingface Transformers
• Sampling rate: 16 kHz
• Preprocessing: Volume normalization, High-Grade noise addition, Prosodic Augmentation, silence trimming
• Learning Rate: 1e-5
• Optimizer: Adamw_pytorch
• Steps: 3000

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📦 Evaluation Data

• FLEURS
• Decodis Test Set (Collected by DECODIS)

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📈 Evaluation Metric (WER)

Dataset	This Model	Whisper Large V2
FLEURS (benchmark)	13.31	39.40
Our test set	69.86	99.98

🎯 Intended Use

This model performs best in:

• Read or dictated speech
• Clean environments with minimal noise
• Evaluation benchmarks like FLEURS

Not recommended for real-world noisy conditions without domain adaptation.

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⚠️ Limitations

• Poor generalization to conversational or spontaneous speech
• Sensitive to background noise and overlapping speakers
• Accents outside training data may reduce accuracy

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📝 Please try the models and share your feedback, issues, or results via:

GitHub Issues: Submit an issue

Hugging Face Discussions: Join the conversation

Your feedback will help us refine our dataset and improve ASR for underrepresented languages like Swahili and Yoruba.

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