pg.evolution.Repeat¶

Accessible via pg.evolution.Repeat.

class Repeat(op, k)[source]¶

Repeat an operation multiple times based on the same input.

A repeat operation passes the input to the child operation for K times, and concatenate their outputs.

Example:

Repeat(pg.evolution.mutators.Uniform(), 3)

which is equivalent to:

pg.evolution.mutators.Uniform() * 3

The code above creates 3 mutated DNA for each DNA from the input.

It’s important to differentiate * and **. For instance, Uniform() ** 3 creates one DNA (mutated on 3 positions) for each DNA from the input.

Methods:

call(inputs, global_state[, step])

Subclasses should override this method.

call(inputs, global_state, step=0)[source]¶

Subclasses should override this method.

The global_state and step are optional for the subclasses’ call signature.

Return type:

List[Any]

Parameters:

inputs – A list of values as inputs.
global_state – An AttributeDict object as the global state container, which is readable/writable during the operation.
step – Number of examples historically proposed, which can be used for determining a cross over schedule.

Returns:

A list of values as output of current operation.