Extend the application zoo

[chrishkchris]

To extend the application zoo, we may reuse some singa-auto example for UI demo
https://github.com/nusdbsystem/singa-auto/tree/master/examples/models

Some applications may be useful for healthcare, depending on the dataset we used to train the model

1. First we can have tabular regression/regression inference UI:
   For regression we can show some graph like the figures in https://en.wikipedia.org/wiki/Linear_regression#:~:text=In%20statistics%2C%20linear%20regression%20is,is%20called%20simple%20linear%20regression.
   i.e. the relationship plot between the input and output, or show the data in a table format for inference result.

2. Pos Tagging
   We can plot some figures like this
   https://blog.aaronccwong.com/2019/building-a-bigram-hidden-markov-model-for-part-of-speech-tagging/