ui-for-training

[treyfel]

Description

We want to make the training on the app functional. This is closely related to #173

Must Include

• ensure tensorflow signatures are provided for the model to train
• save training progress
• have base model to train on
• make sure that the tflite model receives features in the app in the same order as during training on dhc (meaning the order in which the features per sensor are passed should be the same)
• add confusion matrix view to display model evaluation
• add "predict" button to dialog popping up when clicking on recording: this should run inference on the selected recording and display results in a new dialog with confusion matrix view
• add functionality to train button on data screen (open dialog to select subject to train on, ensure this subject has >= 2 recordings, train on all but one of their recordings and evaluate on the remaining and show confusion matrix view for evaluation, have option to save or discard latest training progress)