Update plot rendering from textplots-rs to termplot

[jklott]

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Checklist

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Related Issues/PRs

This solves issue here: #211

Changes

Rendering of plots relied on textplot-rs which has a couple of issues:

1. The dots were not rendering correctly, causing a confusion in what the graph is showing.
2. textplot-rts has a dependency with nom which causes a compilation warning when building burn

The changes made reflect the requirements for using termplot. The main two changes made:

1. Coloring is not an option for termplot so all references to color have been removed.
2. termplot uses f64 values instead of f32 values which were previously used. Conversions have been made where necessary.
3. width variable was of type u32 but has been changed to usize to match height. Use of usize is better practice in this case as well.
4. Syntax has been modified as needed to work with termplot.

Testing

Testing has been done by rendering plots for training data such as mnist example.

[jklott]

Attached is an example rendering on my system which uses VSCode dark mode on Linux Mint.

[antimora]

I can confirm no compilation warning.

I have run your changes locally on Mac M1 via vscode's term, the dots still appear as before. So your term must have a nicer fonts that render the dots differently. Maybe there is a setting in the library to adjust this somehow so an average user can see the plots clearly.

Here is what I am seeing now:

Also there are RED/BLUE labels in cli.rs that probably need to be updated since we don't have colors:

" - {} RED: train | BLUE: valid \n{}",

You mentioned on chat that you were going to try auto scaling for the plot, were you able to achieve it?

[nathanielsimard]

It doesn't work with the text-accuracy example from my side, so maybe there is more work to be done before being merged.

[nathanielsimard]

The Y-Axis isn't always accuracy, it depends on the metric.

[jklott]

Closing this PR as burn-rs is moving away from console based plotting and instead will be using a proper dashboard in the future.