pprint for hyperparameter printout

[Anselmoo]

I am wondering if pprint can be used for the metric printout?

Sometimes the results of the solver are too harsh cropped?

pprint could provide a screen optimized printout and is also builtin-function.

https://github.com/keras-team/autokeras/blob/85bf1e28e39b4e12da795bce88b9a93bb92ef213/autokeras/tuners/task_specific.py#L17-L33