Tutorial BalancingLearner¶
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.
See also
The complete source code of this tutorial can be found in tutorial.BalancingLearner.ipynb
The balancing learner is a “meta-learner” that takes a list of learners. When you request a point from the balancing learner, it will query all of its “children” to figure out which one will give the most improvement.
The balancing learner can for example be used to implement a poor-man’s
2D learner by using the Learner1D.
def h(x, offset=0):
a = 0.01
return x + a**2 / (a**2 + (x - offset)**2)
learners = [adaptive.Learner1D(partial(h, offset=random.uniform(-1, 1)),
bounds=(-1, 1)) for i in range(10)]
bal_learner = adaptive.BalancingLearner(learners)
runner = adaptive.Runner(bal_learner, goal=lambda l: l.loss() < 0.01)
runner.live_info()
plotter = lambda learner: hv.Overlay([L.plot() for L in learner.learners])
runner.live_plot(plotter=plotter, update_interval=0.1)
Often one wants to create a set of learners for a cartesian
product of parameters. For that particular case we’ve added a
classmethod called from_product.
See how it works below
from scipy.special import eval_jacobi
def jacobi(x, n, alpha, beta): return eval_jacobi(n, alpha, beta, x)
combos = {
'n': [1, 2, 4, 8],
'alpha': np.linspace(0, 2, 3),
'beta': np.linspace(0, 1, 5),
}
learner = adaptive.BalancingLearner.from_product(
jacobi, adaptive.Learner1D, dict(bounds=(0, 1)), combos)
runner = adaptive.BlockingRunner(learner, goal=lambda l: l.loss() < 0.01)
# The `cdims` will automatically be set when using `from_product`, so
# `plot()` will return a HoloMap with correctly labeled sliders.
learner.plot().overlay('beta').grid().select(y=(-1, 3))
---------------------------------------------------------------------------
UnboundLocalError Traceback (most recent call last)
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/IPython/core/formatters.py in __call__(self, obj, include, exclude)
968
969 if method is not None:
--> 970 return method(include=include, exclude=exclude)
971 return None
972 else:
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/core/dimension.py in _repr_mimebundle_(self, include, exclude)
1391 combined and returned.
1392 """
-> 1393 return Store.render(self)
1394
1395
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/core/options.py in render(cls, obj)
1451 data, metadata = {}, {}
1452 for hook in hooks:
-> 1453 ret = hook(obj)
1454 if ret is None:
1455 continue
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/ipython/display_hooks.py in pprint_display(obj)
270 if not ip.display_formatter.formatters['text/plain'].pprint:
271 return None
--> 272 return display(obj, raw_output=True)
273
274
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/ipython/display_hooks.py in display(obj, raw_output, **kwargs)
237 if isinstance(obj, GridSpace):
238 with option_state(obj):
--> 239 output = grid_display(obj)
240 elif isinstance(obj, (CompositeOverlay, ViewableElement)):
241 with option_state(obj):
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/ipython/display_hooks.py in wrapped(element)
140 try:
141 max_frames = OutputSettings.options['max_frames']
--> 142 mimebundle = fn(element, max_frames=max_frames)
143 if mimebundle is None:
144 return {}, {}
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/ipython/display_hooks.py in grid_display(grid, max_frames)
225 return None
226
--> 227 return render(grid)
228
229
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/ipython/display_hooks.py in render(obj, **kwargs)
63 renderer = renderer.instance(fig='png')
64
---> 65 return renderer.components(obj, **kwargs)
66
67
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/plotting/bokeh/renderer.py in components(self, obj, fmt, comm, **kwargs)
247 # Bokeh has to handle comms directly in <0.12.15
248 comm = False if bokeh_version < '0.12.15' else comm
--> 249 return super(BokehRenderer, self).components(obj,fmt, comm, **kwargs)
250
251
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/plotting/renderer.py in components(self, obj, fmt, comm, **kwargs)
319 plot = obj
320 else:
--> 321 plot, fmt = self._validate(obj, fmt)
322
323 widget_id = None
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/plotting/renderer.py in _validate(self, obj, fmt, **kwargs)
218 if isinstance(obj, tuple(self.widgets.values())):
219 return obj, 'html'
--> 220 plot = self.get_plot(obj, renderer=self, **kwargs)
221
222 fig_formats = self.mode_formats['fig'][self.mode]
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/plotting/bokeh/renderer.py in get_plot(self_or_cls, obj, doc, renderer, **kwargs)
132 curdoc().theme = self_or_cls.theme
133 doc.theme = self_or_cls.theme
--> 134 plot = super(BokehRenderer, self_or_cls).get_plot(obj, renderer, **kwargs)
135 plot.document = doc
136 return plot
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/plotting/renderer.py in get_plot(self_or_cls, obj, renderer, **kwargs)
205 init_key = tuple(v if d is None else d for v, d in
206 zip(plot.keys[0], defaults))
--> 207 plot.update(init_key)
208 else:
209 plot = obj
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/plotting/plot.py in update(self, key)
593 def update(self, key):
594 if len(self) == 1 and ((key == 0) or (key == self.keys[0])) and not self.drawn:
--> 595 return self.initialize_plot()
596 item = self.__getitem__(key)
597 self.traverse(lambda x: setattr(x, '_updated', True))
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/plotting/bokeh/plot.py in initialize_plot(self, ranges, plots)
647 plot = gridplot(plots[::-1], toolbar_location=self.toolbar,
648 merge_tools=self.merge_tools)
--> 649 plot = self._make_axes(plot)
650
651 title = self._get_title_div(self.keys[-1])
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/plotting/bokeh/plot.py in _make_axes(self, plot)
670
671 def _make_axes(self, plot):
--> 672 width, height = self.renderer.get_size(plot)
673 x_axis, y_axis = None, None
674 kwargs = dict(sizing_mode=self.sizing_mode)
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/plotting/bokeh/renderer.py in get_size(self_or_cls, plot)
354 raise ValueError('Can only compute sizes for HoloViews '
355 'and bokeh plot objects.')
--> 356 return compute_plot_size(plot)
357
358
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/plotting/bokeh/util.py in compute_plot_size(plot)
148 else:
149 w_agg, h_agg = (np.max, np.sum)
--> 150 widths, heights = zip(*[compute_plot_size(child) for child in plot.children])
151 width, height = w_agg(widths), h_agg(heights)
152 elif isinstance(plot, (Figure, Chart)):
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/plotting/bokeh/util.py in <listcomp>(.0)
148 else:
149 w_agg, h_agg = (np.max, np.sum)
--> 150 widths, heights = zip(*[compute_plot_size(child) for child in plot.children])
151 width, height = w_agg(widths), h_agg(heights)
152 elif isinstance(plot, (Figure, Chart)):
~/checkouts/readthedocs.org/user_builds/adaptive/conda/v0.8.1/lib/python3.6/site-packages/holoviews/plotting/bokeh/util.py in compute_plot_size(plot)
154 elif isinstance(plot, (Plot, DataTable, Spacer)):
155 width, height = plot.width, plot.height
--> 156 return width, height
157
158
UnboundLocalError: local variable 'width' referenced before assignment
:GridSpace [n,alpha]
:NdOverlay [beta]
:Overlay
.Scatter.I :Scatter [x] (y)
.Path.I :Path [x,y]