update README.md

Author: yistLin

README.md

@@ -3,6 +3,38 @@
 This is a restructured and rewritten version of [bshall/UniversalVocoding](https://github.com/bshall/UniversalVocoding).
 The main difference here is that the model is turned into a [TorchScript](https://pytorch.org/docs/stable/jit.html) module during training and can be loaded for inferencing anywhere without Python dependencies.
 
+### Preprocess training data
+
+Multiple directories containing audio files can be processed at the same time.
+
+```bash
+python preprocess.py VCTK-Corpus LibriTTS/train-clean-100 preprocessed
+```
+
+### Train from scratch
+
+```bash
+python train.py preprocessed preprocessed/metadata.json
+```
+
+### Generate waveforms
+
+You can load a trained model anywhere and generate multiple waveforms parallelly.
+
+```python
+import torch
+
+vocoder = torch.jit.load("vocoder.pt")
+mels = [
+ torch.randn(100, 80),
+ torch.randn(200, 80),
+ torch.randn(300, 80),
+]
+wavs = vocoder.generate(mels)
+```
+
+Emperically, if you're using the default architecture, you can generate 100 samples at the same time on an Nvidia GTX 1080 Ti.
+
 ### References
 
 - [Towards achieving robust universal neural vocoding](https://arxiv.org/abs/1811.06292)