app.py

import gradio as gr
import numpy as np
import torch
import io
import soundfile as sf
from nemo.collections.asr.models import EncDecMultiTaskModel

# Load the ASR model
canary_model = EncDecMultiTaskModel.from_pretrained('nvidia/canary-1b')

# Update decoding parameters
decode_cfg = canary_model.cfg.decoding
decode_cfg.beam.beam_size = 1
canary_model.change_decoding_strategy(decode_cfg)

# Initialize LLM pipeline
generator = pipeline("text-generation", model="microsoft/Phi-3-mini-4k-instruct", trust_remote_code=True)

# Initialize TTS tokenizer and model
tokenizer = VitsTokenizer.from_pretrained("facebook/mms-tts-eng")
model = VitsModel.from_pretrained("facebook/mms-tts-eng")

def transcribe_generate_and_speak(audio):
    sr, y = audio
    y = y.astype(np.float32)
    y /= np.max(np.abs(y))

    # Transcribe audio
    asr_output = canary_model.transcribe([y], [sr])

    # Generate text based on ASR output
    generated_text = generator(asr_output[0])[0]['generated_text']

    # Generate audio from text
    inputs = tokenizer(text=generated_text, return_tensors="pt")
    set_seed(555)
    with torch.no_grad():
        outputs = model(**inputs)
    waveform = outputs.waveform[0]
    waveform_path = "output.wav"
    sf.write(waveform_path, waveform.numpy(), 16000, format='wav')

    return waveform_path

# Define Gradio interface
audio_input = gr.Interface(
    transcribe_generate_and_speak,
    gr.Audio(sources=["microphone"], label="Speak Here"),
    "audio",
    title="ASR -> LLM -> TTS",
    description="Speak into the microphone and hear the generated audio."
)

# Launch the interface
audio_input.launch()