import asyncio
import datetime
import importlib
import random
import warnings
from contextlib import suppress
_async_enabled = False
_holoviews_enabled = False
_ipywidgets_enabled = False
_plotly_enabled = False
def notebook_extension(*, _inline_js=True):
"""Enable ipywidgets, holoviews, and asyncio notebook integration."""
if not in_ipynb():
raise RuntimeError(
'"adaptive.notebook_extension()" may only be run '
"from a Jupyter notebook."
)
global _async_enabled, _holoviews_enabled, _ipywidgets_enabled
# Load holoviews
try:
_holoviews_enabled = False # After closing a notebook the js is gone
if not _holoviews_enabled:
import holoviews
holoviews.notebook_extension("bokeh", logo=False, inline=_inline_js)
_holoviews_enabled = True
except ModuleNotFoundError:
warnings.warn(
"holoviews is not installed; plotting is disabled.", RuntimeWarning
)
# Load ipywidgets
try:
if not _ipywidgets_enabled:
import ipywidgets # noqa: F401
_ipywidgets_enabled = True
except ModuleNotFoundError:
warnings.warn(
"ipywidgets is not installed; live_info is disabled.", RuntimeWarning
)
# Enable asyncio integration
if not _async_enabled:
get_ipython().magic("gui asyncio") # noqa: F821
_async_enabled = True
def ensure_holoviews():
try:
return importlib.import_module("holoviews")
except ModuleNotFoundError:
raise RuntimeError("holoviews is not installed; plotting is disabled.")
def ensure_plotly():
global _plotly_enabled
try:
import plotly
if not _plotly_enabled:
import plotly.figure_factory
import plotly.graph_objs
import plotly.offline
# This injects javascript and should happen only once
plotly.offline.init_notebook_mode()
_plotly_enabled = True
return plotly
except ModuleNotFoundError:
raise RuntimeError("plotly is not installed; plotting is disabled.")
def in_ipynb():
try:
# If we are running in IPython, then `get_ipython()` is always a global
return get_ipython().__class__.__name__ == "ZMQInteractiveShell"
except NameError:
return False
# Fancy displays in the Jupyter notebook
active_plotting_tasks = dict()
def live_plot(runner, *, plotter=None, update_interval=2, name=None, normalize=True):
"""Live plotting of the learner's data.
Parameters
----------
runner : `~adaptive.Runner`
plotter : function
A function that takes the learner as a argument and returns a
holoviews object. By default ``learner.plot()`` will be called.
update_interval : int
Number of second between the updates of the plot.
name : hasable
Name for the `live_plot` task in `adaptive.active_plotting_tasks`.
By default the name is None and if another task with the same name
already exists that other `live_plot` is canceled.
normalize : bool
Normalize (scale to fit) the frame upon each update.
Returns
-------
dm : `holoviews.core.DynamicMap`
The plot that automatically updates every `update_interval`.
"""
if not _holoviews_enabled:
raise RuntimeError(
"Live plotting is not enabled; did you run "
"'adaptive.notebook_extension()'?"
)
import holoviews as hv
import ipywidgets
from IPython.display import display
if name in active_plotting_tasks:
active_plotting_tasks[name].cancel()
def plot_generator():
while True:
if not plotter:
yield runner.learner.plot()
else:
yield plotter(runner.learner)
streams = [hv.streams.Stream.define("Next")()]
dm = hv.DynamicMap(plot_generator(), streams=streams)
dm.cache_size = 1
if normalize:
# XXX: change when https://github.com/pyviz/holoviews/issues/3637
# is fixed.
dm = dm.map(lambda obj: obj.opts(framewise=True), hv.Element)
cancel_button = ipywidgets.Button(
description="cancel live-plot", layout=ipywidgets.Layout(width="150px")
)
# Could have used dm.periodic in the following, but this would either spin
# off a thread (and learner is not threadsafe) or block the kernel.
async def updater():
event = lambda: hv.streams.Stream.trigger( # noqa: E731
dm.streams
) # XXX: used to be dm.event()
# see https://github.com/pyviz/holoviews/issues/3564
try:
while not runner.task.done():
event()
await asyncio.sleep(update_interval)
event() # fire off one last update before we die
finally:
if active_plotting_tasks[name] is asyncio.Task.current_task():
active_plotting_tasks.pop(name, None)
cancel_button.layout.display = "none" # remove cancel button
def cancel(_):
with suppress(KeyError):
active_plotting_tasks[name].cancel()
active_plotting_tasks[name] = runner.ioloop.create_task(updater())
cancel_button.on_click(cancel)
display(cancel_button)
return dm
def should_update(status):
try:
# Get the length of the write buffer size
buffer_size = len(status.comm.kernel.iopub_thread._events)
# Make sure to only keep all the messages when the notebook
# is viewed, this means 'buffer_size == 1'. However, when not
# viewing the notebook the buffer fills up. When this happens
# we decide to only add messages to it when a certain probability.
# i.e. we're offline for 12h, with an update_interval of 0.5s,
# and without the reduced probability, we have buffer_size=86400.
# With the correction this is np.log(86400) / np.log(1.1) = 119.2
return 1.1 ** buffer_size * random.random() < 1
except Exception:
# We catch any Exception because we are using a private API.
return True
def live_info(runner, *, update_interval=0.5):
"""Display live information about the runner.
Returns an interactive ipywidget that can be
visualized in a Jupyter notebook.
"""
if not _holoviews_enabled:
raise RuntimeError(
"Live plotting is not enabled; did you run "
"'adaptive.notebook_extension()'?"
)
import ipywidgets
from IPython.display import display
status = ipywidgets.HTML(value=_info_html(runner))
cancel = ipywidgets.Button(
description="cancel runner", layout=ipywidgets.Layout(width="100px")
)
cancel.on_click(lambda _: runner.cancel())
async def update():
while not runner.task.done():
await asyncio.sleep(update_interval)
if should_update(status):
status.value = _info_html(runner)
else:
await asyncio.sleep(0.05)
status.value = _info_html(runner)
cancel.layout.display = "none"
runner.ioloop.create_task(update())
display(ipywidgets.VBox((status, cancel)))
def _table_row(i, key, value):
"""Style the rows of a table. Based on the default Jupyterlab table style."""
style = "text-align: right; padding: 0.5em 0.5em; line-height: 1.0;"
if i % 2 == 1:
style += " background: var(--md-grey-100);"
return f'<tr><th style="{style}">{key}</th><th style="{style}">{value}</th></tr>'
def _info_html(runner):
status = runner.status()
color = {
"cancelled": "orange",
"failed": "red",
"running": "blue",
"finished": "green",
}[status]
overhead = runner.overhead()
red_level = max(0, min(int(255 * overhead / 100), 255))
overhead_color = "#{:02x}{:02x}{:02x}".format(red_level, 255 - red_level, 0)
info = [
("status", f'<font color="{color}">{status}</font>'),
("elapsed time", datetime.timedelta(seconds=runner.elapsed_time())),
("overhead", f'<font color="{overhead_color}">{overhead:.2f}%</font>'),
]
with suppress(Exception):
info.append(("# of points", runner.learner.npoints))
with suppress(Exception):
info.append(("latest loss", f'{runner.learner._cache["loss"]:.3f}'))
table = "\n".join(_table_row(i, k, v) for i, (k, v) in enumerate(info))
return f"""
<table>
{table}
</table>
"""