Import and visualize generated outputs

[kasnerz]

For a particular dataset split, the user will upload a text file.

The file will have as many lines as the number of examples in the dataset. Each line will contain an output generated from the model.

The app will the display the generated outputs along with each example.

[kasnerz]

Visualization is ready, files are loaded locally. Upload from the web interface is a nice-to-have but optional feature.