Allow calibrators to modify/process training data.

[damellis]

Depending on the user's setup, we may want to modify the training data supplied by the example author. For instance, if the user is using an accelerometer with a smaller range (say +/- 2G instead of +/- 8G), the sensor readings will clip. This will make them seem different from the training data. So the example author may want to write a function that clips the training data before training the model on it. This is a task for later but might be worth noting as future work in the paper.

[damellis]

Maybe this can be implemented as a pre-processing module that processes incoming data according to the values saved by the calibrator processes?