Add left sidebar for matrix view

[catherinesyeh]

Need to ask Martin for more details (so maybe work on this later), but here are some things it might involve:

• input box where user can type in a sentence
  • this may not be necessary...
• add user's sentence to the query/key plots (right side)
• show attention plot for user's sentence (left side)
  • right now, code for these plots is here: att.html
  • original bertviz repo: https://github.com/jessevig/bertviz
• allow user to click on lines in the attention plot, two types of interaction:
  • emphasize query/key pair (aka. want to see where this pair has high attention)
  • de-emphasize query/key pair (aka. we don't want this pair to have high attention)
• then, update matrix view to show plots with the corresponding features selected by the user (right side)

example attn plot for reference:

[catherinesyeh]

May be able to project new points into same embedding space? E.g., see fit method (vs. fit_transform) for TSNE: https://scikit-learn.org/stable/modules/generated/sklearn.manifold.TSNE.html