Basic history

In this example, we illustrate the use of the BasicHistory plot on the Sobieski’s SSBJ problem.

from gemseo.api import configure_logger
from gemseo.api import create_discipline
from gemseo.api import create_scenario
from gemseo.problems.sobieski.core.problem import SobieskiProblem
from matplotlib import pyplot as plt

Import

The first step is to import some functions from the API and a method to get the design space.

configure_logger()

Out:

<RootLogger root (INFO)>

Description

The BasicHistory post-processing plots any of the constraint or objective functions w.r.t. the optimization iterations or sampling snapshots.

Create disciplines

At this point, we instantiate the disciplines of Sobieski’s SSBJ problem: Propulsion, Aerodynamics, Structure and Mission

disciplines = create_discipline(
    [
        "SobieskiPropulsion",
        "SobieskiAerodynamics",
        "SobieskiStructure",
        "SobieskiMission",
    ]
)

Create design space

We also read the design space from the SobieskiProblem.

design_space = SobieskiProblem().design_space

Create and execute scenario

The next step is to build an MDO scenario in order to maximize the range, encoded ‘y_4’, with respect to the design parameters, while satisfying the inequality constraints ‘g_1’, ‘g_2’ and ‘g_3’. We can use the MDF formulation, the SLSQP optimization algorithm and a maximum number of iterations equal to 100.

scenario = create_scenario(
    disciplines,
    formulation="MDF",
    objective_name="y_4",
    maximize_objective=True,
    design_space=design_space,
)
scenario.set_differentiation_method("user")
for constraint in ["g_1", "g_2", "g_3"]:
    scenario.add_constraint(constraint, "ineq")
scenario.execute({"algo": "SLSQP", "max_iter": 10})

Out:

    INFO - 07:14:21:
    INFO - 07:14:21: *** Start MDOScenario execution ***
    INFO - 07:14:21: MDOScenario
    INFO - 07:14:21:    Disciplines: SobieskiPropulsion SobieskiAerodynamics SobieskiStructure SobieskiMission
    INFO - 07:14:21:    MDO formulation: MDF
    INFO - 07:14:21: Optimization problem:
    INFO - 07:14:21:    minimize -y_4(x_shared, x_1, x_2, x_3)
    INFO - 07:14:21:    with respect to x_1, x_2, x_3, x_shared
    INFO - 07:14:21:    subject to constraints:
    INFO - 07:14:21:       g_1(x_shared, x_1, x_2, x_3) <= 0.0
    INFO - 07:14:21:       g_2(x_shared, x_1, x_2, x_3) <= 0.0
    INFO - 07:14:21:       g_3(x_shared, x_1, x_2, x_3) <= 0.0
    INFO - 07:14:21:    over the design space:
    INFO - 07:14:21:    +----------+-------------+-------+-------------+-------+
    INFO - 07:14:21:    | name     | lower_bound | value | upper_bound | type  |
    INFO - 07:14:21:    +----------+-------------+-------+-------------+-------+
    INFO - 07:14:21:    | x_shared |     0.01    |  0.05 |     0.09    | float |
    INFO - 07:14:21:    | x_shared |    30000    | 45000 |    60000    | float |
    INFO - 07:14:21:    | x_shared |     1.4     |  1.6  |     1.8     | float |
    INFO - 07:14:21:    | x_shared |     2.5     |  5.5  |     8.5     | float |
    INFO - 07:14:21:    | x_shared |      40     |   55  |      70     | float |
    INFO - 07:14:21:    | x_shared |     500     |  1000 |     1500    | float |
    INFO - 07:14:21:    | x_1      |     0.1     |  0.25 |     0.4     | float |
    INFO - 07:14:21:    | x_1      |     0.75    |   1   |     1.25    | float |
    INFO - 07:14:21:    | x_2      |     0.75    |   1   |     1.25    | float |
    INFO - 07:14:21:    | x_3      |     0.1     |  0.5  |      1      | float |
    INFO - 07:14:21:    +----------+-------------+-------+-------------+-------+
    INFO - 07:14:21: Solving optimization problem with algorithm SLSQP:
    INFO - 07:14:21: ...   0%|          | 0/10 [00:00<?, ?it]
    INFO - 07:14:21: ...  20%|██        | 2/10 [00:00<00:00, 40.71 it/sec, obj=-2.12e+3]
 WARNING - 07:14:21: MDAJacobi has reached its maximum number of iterations but the normed residual 1.0259352902248124e-06 is still above the tolerance 1e-06.
    INFO - 07:14:21: ...  30%|███       | 3/10 [00:00<00:00, 23.40 it/sec, obj=-3.8e+3]
    INFO - 07:14:21: ...  40%|████      | 4/10 [00:00<00:00, 17.02 it/sec, obj=-3.96e+3]
    INFO - 07:14:21: ...  50%|█████     | 5/10 [00:00<00:00, 13.35 it/sec, obj=-3.96e+3]
    INFO - 07:14:22: ...  60%|██████    | 6/10 [00:00<00:00, 10.98 it/sec, obj=-3.96e+3]
    INFO - 07:14:22: ...  70%|███████   | 7/10 [00:01<00:00,  9.50 it/sec, obj=-4.81e+3]
    INFO - 07:14:22: ...  90%|█████████ | 9/10 [00:01<00:00,  7.91 it/sec, obj=-3.87e+3]
    INFO - 07:14:22: ... 100%|██████████| 10/10 [00:01<00:00,  7.51 it/sec, obj=-4.64e+3]
    INFO - 07:14:22: Optimization result:
    INFO - 07:14:22:    Optimizer info:
    INFO - 07:14:22:       Status: None
    INFO - 07:14:22:       Message: Maximum number of iterations reached. GEMSEO Stopped the driver
    INFO - 07:14:22:       Number of calls to the objective function by the optimizer: 12
    INFO - 07:14:22:    Solution:
    INFO - 07:14:22:       The solution is feasible.
    INFO - 07:14:22:       Objective: -3963.5118239326903
    INFO - 07:14:22:       Standardized constraints:
    INFO - 07:14:22:          g_1 = [-0.01808064 -0.03336052 -0.04426042 -0.05184355 -0.05733364 -0.13720861
    INFO - 07:14:22:  -0.10279139]
    INFO - 07:14:22:          g_2 = 9.785920617177979e-06
    INFO - 07:14:22:          g_3 = [-7.67233630e-01 -2.32766370e-01  8.55509121e-05 -1.83255000e-01]
    INFO - 07:14:22:       Design space:
    INFO - 07:14:22:       +----------+-------------+---------------------+-------------+-------+
    INFO - 07:14:22:       | name     | lower_bound |        value        | upper_bound | type  |
    INFO - 07:14:22:       +----------+-------------+---------------------+-------------+-------+
    INFO - 07:14:22:       | x_shared |     0.01    | 0.06000244648015432 |     0.09    | float |
    INFO - 07:14:22:       | x_shared |    30000    |        60000        |    60000    | float |
    INFO - 07:14:22:       | x_shared |     1.4     |         1.4         |     1.8     | float |
    INFO - 07:14:22:       | x_shared |     2.5     |         2.5         |     8.5     | float |
    INFO - 07:14:22:       | x_shared |      40     |          70         |      70     | float |
    INFO - 07:14:22:       | x_shared |     500     |         1500        |     1500    | float |
    INFO - 07:14:22:       | x_1      |     0.1     |  0.3999997783130735 |     0.4     | float |
    INFO - 07:14:22:       | x_1      |     0.75    |         0.75        |     1.25    | float |
    INFO - 07:14:22:       | x_2      |     0.75    |         0.75        |     1.25    | float |
    INFO - 07:14:22:       | x_3      |     0.1     |  0.1562581125267868 |      1      | float |
    INFO - 07:14:22:       +----------+-------------+---------------------+-------------+-------+
    INFO - 07:14:22: *** End MDOScenario execution (time: 0:00:01.347023) ***

{'max_iter': 10, 'algo': 'SLSQP'}

Post-process scenario

Lastly, we post-process the scenario by means of the BasicHistory plot which plots any of the constraint or objective functions w.r.t. optimization iterations or sampling snapshots.

Tip

Each post-processing method requires different inputs and offers a variety of customization options. Use the API function get_post_processing_options_schema() to print a table with the options for any post-processing algorithm. Or refer to our dedicated page: Post-processing algorithms.

scenario.post_process(
    "BasicHistory", variable_names=["g_1", "g_2", "g_3"], save=False, show=False
)
scenario.post_process("BasicHistory", variable_names=["y_4"], save=False, show=False)
  • History plot
  • History plot

Out:

<gemseo.post.basic_history.BasicHistory object at 0x7f2928510100>

Note

Set the boolean instance attribute OptimizationProblem.use_standardized_objective to False to plot the objective to maximize as a performance function.

scenario.use_standardized_objective = False
scenario.post_process("BasicHistory", variable_names=["y_4"], save=False, show=False)
# Workaround for HTML rendering, instead of ``show=True``
plt.show()
History plot

Total running time of the script: ( 0 minutes 1.964 seconds)

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