Results 3 issues of Bill Xue

Anki connect server is running, but cannot show green button to add the word. ![Screenshot from 2019-05-09 00-12-12](https://user-images.githubusercontent.com/3424201/57390579-4af1e500-71ef-11e9-8fc7-58ac1dd79df4.png)

**Describe the bug** For function `add_embedding()`, when the input label is using utf-8 Chinese characters, it can export tensorboard log file. However, when you check the projector using `tensorboard --logdir...

I'm using `matio.load` to load a `.mat` file. It contains file arrays, `xtrain`, `xtest`, `ytrain`, `ytest` and `vocab`. matio got **Unsupported variable type: 5** while loading `xtrain` and `ytrain`. And...