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app.py
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import os
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import torch
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import gradio as gr
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import torchaudio
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from transformers import AutoFeatureExtractor, HubertModel
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from optimum.onnxruntime import ORTModelForFeatureExtraction
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from pathlib import Path
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# Configuration
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SAVE_DIR = "exported_model"
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HF_HUBERT = "facebook/hubert-base-ls960" # RVC Standard
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DEVICE = "cuda" if torch.cuda.is_available() else "cpu"
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def convert_to_onnx(audio_input):
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if audio_input is None:
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return None, "Error: No audio provided."
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try:
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# 1. Load Audio & Preprocess (Target 16kHz for HuBERT)
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waveform, sr = torchaudio.load(audio_input)
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if sr != 16000:
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resampler = torchaudio.transforms.Resample(sr, 16000)
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waveform = resampler(waveform)
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# 2. Export the HF Backbone to ONNX using Optimum
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# This compiles the 'voice feature extractor' part of the RVC pipeline
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print("Compiling HF Backbone to ONNX...")
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onnx_model = ORTModelForFeatureExtraction.from_pretrained(
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HF_HUBERT,
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export=True,
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torch_dtype=torch.float32
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)
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# Save the compiled model locally
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onnx_model.save_pretrained(SAVE_DIR)
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# In a real FastRVC3.0 app, you would also export the Generator .pth here
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# For this demo, we provide the compiled HuBERT backbone as the result
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model_path = os.path.join(SAVE_DIR, "model.onnx")
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return model_path, "Successfully compiled Voice-to-ONNX backbone!"
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except Exception as e:
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return None, f"Status: Error - {str(e)}"
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# --- Gradio UI ---
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with gr.Blocks(title="FastRVC 3.0 HF Compiler") as demo:
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gr.Markdown("# 🤗 FastRVC 3.0 + HF Optimum")
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gr.Markdown("Transform Hugging Face Voice Transformers into high-speed **ONNX** binaries.")
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with gr.Row():
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with gr.Column():
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audio_in = gr.Audio(label="Source Voice Sample", type="filepath")
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btn = gr.Button("Compile & Export", variant="primary")
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with gr.Column():
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status = gr.Textbox(label="Status")
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file_out = gr.File(label="Download .onnx Model")
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btn.click(
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fn=convert_to_onnx,
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inputs=[audio_in],
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outputs=[file_out, status]
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)
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if __name__ == "__main__":
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demo.launch()
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