This function adds a layer of test dataset.
Arguments
- data
- Test data to draw, which has the same format with the train data. 
- colour
- Color of the line (By default, - red).
- ...
- Other arguments passed on the - ggplot2::geom_path().
This function adds a layer of test dataset.
Test data to draw, which has the same format with the train data.
Color of the line (By default, red).
Other arguments passed on the ggplot2::geom_path().