BaseParamScheduler#

class ignite.handlers.param_scheduler.BaseParamScheduler(param_name, save_history=False)[source]#

An abstract class for updating an engine state or optimizer’s parameter value during training.

Parameters

param_name (str) – name of engine state or optimizer’s parameter to update.
save_history (bool) – whether to log the parameter values to engine.state.param_history, (default=False).

New in version 0.5.0.

Methods

`get_param`	Method to get current parameter values
`load_state_dict`	Copies parameters from `state_dict` into this BaseParamScheduler.
`plot_values`	Method to plot simulated scheduled values during num_events events.
`simulate_values`	Method to simulate scheduled values during num_events events.
`state_dict`	Returns a dictionary containing a whole state of BaseParamScheduler.

abstract get_param()[source]#

Method to get current parameter values

Returns: list of params, or scalar param
Return type: Union[List[float], float]

load_state_dict(state_dict)[source]#

Copies parameters from state_dict into this BaseParamScheduler.

Parameters: state_dict (Mapping) – a dict containing parameters.
Return type: None

classmethod plot_values(num_events, **scheduler_kwargs)[source]#

Method to plot simulated scheduled values during num_events events.

This class requires matplotlib package to be installed:

pip install matplotlib

Parameters

num_events (int) – number of events during the simulation.
scheduler_kwargs (Mapping) – parameter scheduler configuration kwargs.

Returns

matplotlib.lines.Line2D

Return type

Any

Examples

import matplotlib.pylab as plt

plt.figure(figsize=(10, 7))
LinearCyclicalScheduler.plot_values(num_events=50, param_name='lr',
                                    start_value=1e-1, end_value=1e-3, cycle_size=10))

abstract classmethod simulate_values(num_events, **scheduler_kwargs)[source]#

Method to simulate scheduled values during num_events events.

Parameters

num_events (int) – number of events during the simulation.
scheduler_kwargs (Any) – parameter scheduler configuration kwargs.

Returns

event_index, value

Return type

List[List[int]]

state_dict()[source]#

Returns a dictionary containing a whole state of BaseParamScheduler.

Returns: a dictionary containing a whole state of BaseParamScheduler
Return type: dict