Tutorial `DataSaver`#

Note

Because this documentation consists of static html, the live_plot and live_info widget is not live. Download the notebook in order to see the real behaviour. [1]

If the function that you want to learn returns a value along with some metadata, you can wrap your learner in an adaptive.DataSaver.

In the following example the function to be learned returns its result and the execution time in a dictionary:

from operator import itemgetter


def f_dict(x):
    """The function evaluation takes roughly the time we `sleep`."""
    import random
    from time import sleep

    waiting_time = random.random()
    sleep(waiting_time)
    a = 0.01
    y = x + a**2 / (a**2 + x**2)
    return {"y": y, "waiting_time": waiting_time}


# Create the learner with the function that returns a 'dict'
# This learner cannot be run directly, as Learner1D does not know what to do with the 'dict'
_learner = adaptive.Learner1D(f_dict, bounds=(-1, 1))

# Wrapping the learner with 'adaptive.DataSaver' and tell it which key it needs to learn
learner = adaptive.DataSaver(_learner, arg_picker=itemgetter("y"))

learner.learner is the original learner, so learner.learner.loss() will call the correct loss method.

runner = adaptive.Runner(learner, loss_goal=0.1)

runner.live_info()

runner.live_plot(plotter=lambda lrn: lrn.learner.plot(), update_interval=0.1)

Now the DataSavingLearner will have an dictionary attribute extra_data that has x as key and the data that was returned by learner.function as values.

learner.extra_data

OrderedDict([(-1.0,
              {'y': -0.9999000099990001, 'waiting_time': 0.6032142559347609}),
             (1.0, {'y': 1.000099990001, 'waiting_time': 0.9248038583010411}),
             (0.0, {'y': 1.0, 'waiting_time': 0.4212437295586874}),
             (-0.5,
              {'y': -0.4996001599360256, 'waiting_time': 0.20216121946075372}),
             (-0.75,
              {'y': -0.7498222538215429, 'waiting_time': 0.38816713327589236}),
             (0.5,
              {'y': 0.5003998400639744, 'waiting_time': 0.21694761940599605}),
             (-0.25,
              {'y': -0.24840255591054314, 'waiting_time': 0.7162155325447735}),
             (-0.125,
              {'y': -0.11864069952305246,
               'waiting_time': 0.19617454684900848}),
             (-0.375,
              {'y': -0.3742893942085628, 'waiting_time': 0.920450867260399}),
             (-0.0625,
              {'y': -0.0375390015600624, 'waiting_time': 0.5612068324396554}),
             (0.75,
              {'y': 0.7501777461784571, 'waiting_time': 0.09839639685527501}),
             (-0.03125,
              {'y': 0.06163824383164006, 'waiting_time': 0.09889172900282694}),
             (0.25,
              {'y': 0.2515974440894569, 'waiting_time': 0.11104161797766121}),
             (-0.015625,
              {'y': 0.27495388762769585, 'waiting_time': 0.1507554106312582}),
             (0.125,
              {'y': 0.13135930047694755, 'waiting_time': 0.3397601812008625}),
             (0.0625,
              {'y': 0.0874609984399376, 'waiting_time': 0.07624857218330194}),
             (-0.0078125,
              {'y': 0.6131699135839903, 'waiting_time': 0.6911343106781312}),
             (0.015625,
              {'y': 0.30620388762769585, 'waiting_time': 0.12702903541678756}),
             (0.0078125,
              {'y': 0.6287949135839903, 'waiting_time': 0.1308840007409373}),
             (0.03125,
              {'y': 0.12413824383164006, 'waiting_time': 0.8478716282050434}),
             (-0.00390625,
              {'y': 0.8637065438995976, 'waiting_time': 0.6290690444127799}),
             (0.00390625,
              {'y': 0.8715190438995976, 'waiting_time': 0.7430668045386412}),
             (-0.625,
              {'y': -0.6247440655192271, 'waiting_time': 0.5377927699417097}),
             (0.875,
              {'y': 0.8751305951875673, 'waiting_time': 0.40353637986938073}),
             (-0.875,
              {'y': -0.8748694048124327, 'waiting_time': 0.6314789384446432}),
             (0.625,
              {'y': 0.6252559344807729, 'waiting_time': 0.09042786343924925}),
             (0.375,
              {'y': 0.3757106057914372, 'waiting_time': 0.08509020253140598}),
             (-0.01171875,
              {'y': 0.40963707758975415, 'waiting_time': 0.2236775410934818}),
             (0.01171875,
              {'y': 0.43307457758975415, 'waiting_time': 0.3162967069576331}),
             (-0.005859375,
              {'y': 0.7385633611533918, 'waiting_time': 0.14403414869014197}),
             (-0.0234375,
              {'y': 0.1305706215220334, 'waiting_time': 0.04716915265374855}),
             (0.005859375,
              {'y': 0.7502821111533918, 'waiting_time': 0.9601785749802318}),
             (-0.009765625,
              {'y': 0.5020904154886127, 'waiting_time': 0.8735668680468762})])

Tutorial DataSaver#

Tutorial `DataSaver`#