Optimisation Loop

class stride.optimisation.optimisation_loop.OptimisationLoop(name='optimisation_loop', **kwargs)

Bases: stride.problem.base.Saved

Objects of this class act as managers of a local optimisation process.

The general convention is to divide the optimisation process in blocks and iterations, although that doesn’t have to be the case. A block determines a set of conditions that is maintained over a number of iterations, such as the frequency band used or the step size applied.

Blocks are generated through Optimisation.blocks:

>>> for block in optimisation.blocks(num_blocks, *iterators):
>>>     block.config(...)
>>>

The default running behaviour of the optimisation is obtained when calling Optimisation.run(block, problem):

>>> for block in optimisation.blocks(num_blocks, *iterators):
>>>     block.config(...)
>>>     await optimisation.run(block, problem)

but iterations can also be run manually:

>>> for block in optimisation.blocks(num_blocks, *iterators):
>>>     block.config(...)
>>>
>>>     for iteration in block.iterations(num_iterations, *iterators):
>>>         pass

Parameters

name (str, optional) – Optional name for the optimisation object.

blocks(num, *iters, restart=False, restart_id=- 1, **kwargs)

Generator for the blocks of the optimisation.

Parameters

• num (int) – Number of blocks to generate.

• iters (tuple, optional) – Any other iterables to zip with the blocks.

• restart (int or bool, optional) – Whether or not attempt to restart the loop from a previous block. Defaults to False.

• restart_id (int, optional) – If an integer greater than zero, it will restart from a specific block. Otherwise, it will restart from the latest available block.

Returns

Blocks iterable.

Return type

iterable

clear()

Clear the loop.

property current_block

Get current active block.

dump(*args, **kwargs)

Dump latest version of the loop to a file.

See Saved for more information on the parameters of this method.

Parameters

• args –

• kwargs –

property num_blocks

Get number of blocks.

property problem

Access problem object.

class stride.optimisation.optimisation_loop.Block(id, opt_loop, **kwargs)

Bases: object

A block determines a set of conditions that is maintained over a number of iterations, such as the frequency band used or the step size applied.

The iteration loop of the block can be started using the generator Block.iterations as:

>>> for iteration in block.iterations(num_iterations, *iterators):
>>>     pass

Parameters

• id (int) – Numerical ID of the block.

• opt_loop (OptimisationLoop) – Loop to which the block belongs.

clear()

Clear the block.

property current_iteration

Get current active iteration.

property fun_value

Functional value for this block across all iterations.

iterations(num, *iters, restart=None, restart_id=- 1)

Generator of iterations.

Parameters

• num (int) – Number of iterations to generate.

• iters (tuple, optional) – Any other iterables to zip with the iterations.

• restart (int or bool, optional) – Whether or not attempt to restart the loop from a previous iteration. Defaults to the value given to the loop.

• restart_id (int, optional) – If an integer greater than zero, it will restart from a specific iteration. Otherwise, it will restart from the latest available iteration.

Returns

Iteration iterables.

Return type

iterable

property num_iterations

Number of iterations in the block.

class stride.optimisation.optimisation_loop.Iteration(id, abs_id, block, opt_loop)

Bases: object

Objects of this class contain information about the iteration, such as the value of the functional.

Parameters

• id (int) – Numerical ID of the iteration.

• abs_id (int) – Numerical ID of the iteration in absolute, global terms.

• block (Block) – Block to which the iteration belongs.

• opt_loop (OptimisationLoop) – Loop to which the iteration belongs.

add_fun(fun)

Add a functional value for a particular shot to the iteration.

Parameters

fun (FunctionalValue) –

add_step_fun(fun)

Add a functional value, after step, for a particular shot to the iteration.

Parameters

fun (FunctionalValue) –

property fun_value

Functional value for this iteration across all shots.

property step_fun_value

Functional value for this iteration across all shots after step.