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Add doctest for MultiStepScheduler #2399

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merged 4 commits into from
Jan 1, 2022
Merged

Add doctest for MultiStepScheduler #2399

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0ca3d6f
doctest for MultiStepScheduler
bibhabasumohapatra Dec 31, 2021
621ec95
Merge branch 'master' into doctest-MultiStepStateScheduler
sdesrozis Dec 31, 2021
e49f4a6
Update ignite/handlers/state_param_scheduler.py
sdesrozis Dec 31, 2021
366108b
Merge branch 'master' into doctest-MultiStepStateScheduler
sdesrozis Jan 1, 2022
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43 changes: 35 additions & 8 deletions ignite/handlers/state_param_scheduler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -438,21 +438,48 @@ class MultiStepStateScheduler(StateParamScheduler):

Examples:

.. code-block:: python
.. testsetup::

...
engine = Engine(train_step)
default_trainer = get_default_trainer()

.. testcode::

param_scheduler = MultiStepStateScheduler(
param_name="param", initial_value=10, gamma=0.99, milestones=[3, 6],
param_name="param", initial_value=1, gamma=0.9, milestones=[3, 6, 9, 12]
)

param_scheduler.attach(engine, Events.EPOCH_COMPLETED)
# parameter is param, initial_value sets param to 1, gamma is set as 0.9
# Epoch 1 to 2, param does not change as milestone is 3
# Epoch 3, param changes from 1 to 1*0.9, param = 0.9
# Epoch 3 to 5, param does not change as milestone is 6
# Epoch 6, param changes from 0.9 to 0.9*0.9, param = 0.81
# Epoch 6 to 8, param does not change as milestone is 9
# Epoch 9, param changes from 0.81 to 0.81*0.9, param = 0.729
# Epoch 9 to 11, param does not change as milestone is 12
# Epoch 12, param changes from 0.729 to 0.729*0.9, param = 0.6561

# basic handler to print scheduled state parameter
engine.add_event_handler(Events.EPOCH_COMPLETED, lambda _ : print(engine.state.param))
param_scheduler.attach(default_trainer, Events.EPOCH_COMPLETED)

@default_trainer.on(Events.EPOCH_COMPLETED)
def print_param():
print(default_trainer.state.param)

engine.run([0] * 8, max_epochs=10)
default_trainer.run([0], max_epochs=12)

.. testoutput::

1.0
1.0
0.9
0.9
0.9
0.81
0.81
0.81
0.7290...
0.7290...
0.7290...
0.6561

.. versionadded:: 0.5.0

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