app.py

import os
import glob
import random
import logging
import torch
import gradio as gr
from matchboxnet.model import MatchboxNetForAudioClassification
from matchboxnet.feature_extraction import MatchboxNetFeatureExtractor

def setup_logging():
    logging.basicConfig(level=logging.INFO)
    return logging.getLogger(__name__)

logger = setup_logging()

# Device selection
if torch.cuda.is_available():
    device = "cuda"
    logger.info("Using CUDA for inference.")
elif torch.backends.mps.is_available():
    device = "mps"
    logger.info("Using MPS for inference.")
else:
    device = "cpu"
    logger.info("Using CPU for inference.")


def load_model():
    auth_token = os.getenv("HF_TOKEN")
    model = MatchboxNetForAudioClassification.from_pretrained(
        "Panga-Azazia/matchboxnet3x2x64-bambara-a-c",
        trust_remote_code=True
    ).to(device)
    feature_extractor = MatchboxNetFeatureExtractor.from_pretrained(
        "Panga-Azazia/matchboxnet3x2x64-bambara-a-c",
    )
    model.config.id2label = {int(k): v for k, v in model.config.id2label.items()}
    return model, feature_extractor

MODEL, FEATURE_EXTRACTOR = load_model()
LABELS = [MODEL.config.id2label[i] for i in sorted(MODEL.config.id2label.keys())]


def get_example_files(directory="./examples"):
    if not os.path.exists(directory):
        logger.warning(f"Examples directory {directory} not found.")
        return []
    files = glob.glob(f"{directory}/**/**")
    random.shuffle(files)
    #audio_extensions = ['.wav', '.mp3', '.m4a', '.flac', '.ogg']
    #files = [os.path.abspath(os.path.join(directory, f))
    #         for f in os.listdir(directory)
    #         if any(f.lower().endswith(ext) for ext in audio_extensions)]
    logger.info(f"Found {len(files)} example(s) files.")
    # return up to first 5 examples
    return files[:5]


def predict(audio):
    if isinstance(audio, str):
        batch = FEATURE_EXTRACTOR(audio, sampling_rate=None, return_tensors="pt")
    else:
        sr, waveform = audio
        batch = FEATURE_EXTRACTOR(waveform, sampling_rate=sr, return_tensors="pt")
    batch = {k: v.to(device) for k, v in batch.items()}

    with torch.no_grad():
        outputs = MODEL(**batch)
        probs = torch.softmax(outputs.logits, dim=-1).squeeze().tolist()
        pred_idx = int(torch.tensor(outputs.logits).argmax().item())
    return {lbl: float(probs[i]) for i, lbl in enumerate(LABELS)}


def build_interface():
    example_files = get_example_files()
    with gr.Blocks(title="Bambara Audio Classification (ayi, awɔ, foyi)") as demo:
        gr.Markdown(
            """
            # 🎧 Bambara Audio Classification

            Classify Bambara audio into **ayi**, **awɔ**, and **foyi** using MatchboxNet.
            """
        )
        with gr.Row():
            with gr.Column():
                audio_input = gr.Audio(
                    label="🎤 Record or Upload Audio",
                    type="filepath",
                    sources=["microphone", "upload"]  # CORRECTION: 'source' → 'sources'
                )
                predict_btn = gr.Button("🔍 Classify Audio", variant="primary")
                clear_btn = gr.Button("🗑️ Clear", variant="secondary")
            with gr.Column():
                output_label = gr.Label(num_top_classes=3, label="Predicted Probabilities")
        if example_files:
            gr.Markdown("## 🎵 Try Examples")
            gr.Examples(
                examples=[[f] for f in example_files],
                inputs=[audio_input],
                outputs=[output_label],
                fn=predict,
                cache_examples=False
            )
        # Random example button
        rnd_btn = gr.Button("🎲 Random Example")
        rnd_btn.click(
            fn=lambda: random.choice(example_files) if example_files else None,
            outputs=[audio_input]
        )
        predict_btn.click(
            fn=predict,
            inputs=[audio_input],
            outputs=[output_label],
            show_progress=True
        )
        clear_btn.click(
            fn=lambda: (None, {}),
            outputs=[audio_input, output_label]
        )
    return demo


def main():
    logger.info("Starting Gradio app...")
    interface = build_interface()
    interface.launch(
        share=False,
        server_name="0.0.0.0",
        server_port=7860
    )
    logger.info("App launched.")

if __name__ == "__main__":
    main()