import torch
import torchaudio
import gradio as gr
import matplotlib.pyplot as plt

device="cpu"
bundle = torchaudio.pipelines.TACOTRON2_WAVERNN_PHONE_LJSPEECH
processor = bundle.get_text_processor()
tacotron2 = bundle.get_tacotron2().to(device)

# Workaround to load model mapped on GPU
# https://stackoverflow.com/a/61840832
waveglow = torch.hub.load(
    "NVIDIA/DeepLearningExamples:torchhub",
    "nvidia_waveglow",
    model_math="fp32",
    pretrained=False,
)
checkpoint = torch.hub.load_state_dict_from_url(
    "https://api.ngc.nvidia.com/v2/models/nvidia/waveglowpyt_fp32/versions/1/files/nvidia_waveglowpyt_fp32_20190306.pth",  # noqa: E501
    progress=False,
    map_location=device,
)
state_dict = {key.replace("module.", ""): value for key, value in checkpoint["state_dict"].items()}

waveglow.load_state_dict(state_dict)
waveglow = waveglow.remove_weightnorm(waveglow)
waveglow = waveglow.to(device)
waveglow.eval()

def inference(text):

  with torch.inference_mode():
      processed, lengths = processor(text)
      processed = processed.to(device)
      lengths = lengths.to(device)
      spec, _, _ = tacotron2.infer(processed, lengths)

  plt.imshow(spec[0].cpu().detach())
  plt.axis('off')
  plt.savefig("test.png", bbox_inches='tight')

  with torch.no_grad():
      waveforms = waveglow.infer(spec)

  torchaudio.save("output_waveglow.wav", waveforms[0:1].cpu(), sample_rate=22050)
  return "output_waveglow.wav","test.png"
  
title="TACOTRON 2"
description="Gradio demo for TACOTRON 2: The Tacotron 2 model for generating mel spectrograms from text. To use it, simply add you text or click on one of the examples to load them. Read more at the links below."
article = "<p style='text-align: center'><a href='https://arxiv.org/abs/1712.05884' target='_blank'>Natural TTS Synthesis by Conditioning WaveNet on Mel Spectrogram Predictions</a> | <a href='https://github.com/NVIDIA/DeepLearningExamples/tree/master/PyTorch/SpeechSynthesis/Tacotron2' target='_blank'>Github Repo</a></p>"
examples=[["life is like a box of chocolates"]]
gr.Interface(inference,"text",[gr.outputs.Audio(type="file",label="Audio"),gr.outputs.Image(type="file",label="Spectrogram")],title=title,description=description,article=article,examples=examples).launch(enable_queue=True)