Utils

Graphic

class jmetal.util.graphic.FrontPlot(plot_title: str, axis_labels: list = None)

Bases: jmetal.util.graphic.Plot

Creates a new FrontPlot instance. Suitable for problems with 2 or more objectives.

Parameters:
  • plot_title – Title of the graph.
  • axis_labels – List of axis labels.
export(filename: str = '', include_plotlyjs: bool = False) → str

Export as a div for embedding the graph in an HTML file.

Parameters:
  • filename – Output file name (if desired, default to None).
  • include_plotlyjs – If True, include plot.ly JS script (default to False).
Returns:

Script as string.
plot(front: typing.List[S], reference_front: typing.List[S] = None, normalize: bool = False) → None

Plot a front of solutions (2D, 3D or parallel coordinates).

Parameters:
  • front – List of solutions.
  • reference_front – Reference solution list (if any).
  • normalize – Normalize the input front between 0 and 1 (for problems with more than 3 objectives).
to_html(filename: str = 'front') → str

Export the graph to an interactive HTML (solutions can be selected to show some metadata).

Parameters:filename – Output file name.
Returns:Script as string.
update(data: typing.List[S], normalize: bool = False, legend: str = '') → None

Update an already created graph with new data.

Parameters:
  • data – List of solutions to be included.
  • legend – Legend to be included.
  • normalize – Normalize the input front between 0 and 1 (for problems with more than 3 objectives).
class jmetal.util.graphic.Plot(plot_title: str, axis_labels: list)

Bases: object

static get_objectives(front: typing.List[S]) → <Mock name='mock.DataFrame' id='140475564615440'>

Get objectives for each solution of the front.

Parameters:front – List of solutions.
Returns:Pandas dataframe with one column for each objective and one row for each solution.
class jmetal.util.graphic.ScatterStreaming(plot_title: str, axis_labels: list = None)

Bases: jmetal.util.graphic.Plot

Creates a new ScatterStreaming instance. Suitable for problems with 2 or 3 objectives in streaming.

Parameters:
  • plot_title – Title of the diagram.
  • axis_labels – List of axis labels.
plot(front: typing.List[S], reference_front: typing.List[S], filename: str = '', show: bool = True) → None

Plot a front of solutions (2D or 3D).

Parameters:
  • front – List of solutions.
  • reference_front – Reference solution list (if any).
  • filename – If specified, save the plot into a file.
  • show – If True, show the final diagram (default to True).
update(front: typing.List[S], reference_front: typing.List[S], rename_title: str = '', persistence: bool = True) → None

Update an already created plot.

Parameters:
  • front – List of solutions.
  • reference_front – Reference solution list (if any).
  • rename_title – New title of the plot.
  • persistence – If True, keep old points; else, replace them with new values.

Lab of experiments

class jmetal.util.laboratory.Experiment(algorithm_list: list, n_runs: int = 1, m_workers: int = 6)

Bases: object

Parameters:
  • algorithm_list – List of algorithms as Tuple(Algorithm, dic() with parameters).
  • m_workers – Maximum number of workers for ProcessPoolExecutor.
compute_metrics(metric_list: list) → dict
Parameters:metric_list – List of metrics. Each metric should inherit from Metric or, at least,

contain a method compute.

export_to_file(base_directory: str = 'experiment', function_values_filename: str = 'FUN', variables_filename: str = 'VAR')
run() → None

Run the experiment.

jmetal.util.laboratory.jMetalPyLogger = <Logger jMetalPy (DEBUG)>

Solution list output

jmetal.util.solution_list_output.S = ~S
class jmetal.util.solution_list_output.SolutionList

Bases: typing.Generic

static print_function_values_to_file(solution_list: list, file_name)
static print_function_values_to_screen(solution_list: list)
static print_variables_to_file(solution_list: list, file_name)
static print_variables_to_screen(solution_list: list)