# -*- coding: utf-8 -*-
# Copyright 2021 IRT Saint Exupéry, https://www.irt-saintexupery.com
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License version 3 as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
# Contributors:
# INITIAL AUTHORS - API and implementation and/or documentation
# :author: Francois Gallard
# OTHER AUTHORS - MACROSCOPIC CHANGES
# :author: Benoit Pauwels - Stacked data management
# (e.g. iteration index)
# :author: Gilberto Ruiz Jimenez
"""The MDOFunction subclass to create a function from an MDODiscipline."""
from __future__ import division, unicode_literals
import logging
from typing import TYPE_CHECKING, Iterable, Optional, Sequence
from numpy import empty, ndarray
from gemseo.core.mdofunctions.function_generator import MDOFunctionGenerator
from gemseo.core.mdofunctions.mdo_function import MDOFunction
if TYPE_CHECKING:
from gemseo.core.discipline import MDODiscipline
from gemseo.core.formulation import MDOFormulation
LOGGER = logging.getLogger(__name__)
[docs]class FunctionFromDiscipline(MDOFunction):
"""An :class:`.MDOFunction` object from an :class:`.MDODiscipline."""
def __init__(
self,
output_names, # type: Sequence[str]
mdo_formulation, # type: MDOFormulation
discipline=None, # type: Optional[MDODiscipline]
top_level_disc=True, # type:bool
x_names=None, # type: Optional[Sequence[str]]
all_data_names=None, # type:Optional[Iterable[str]]
differentiable=True, # type: bool
): # type: (...) -> None
"""
Args:
output_names: The names of the outputs.
mdo_formulation: The MDOFormulation object in which the function is
located.
discipline: The discipline computing these outputs.
If None, the discipline is detected from the inner disciplines.
top_level_disc: If True, search the discipline among the top level ones.
x_names: The names of the design variables.
If None, use self.get_x_names_of_disc(discipline).
all_data_names: The reference data names for masking x.
If None, use self.get_optim_variables_names().
differentiable: If True, then inputs and outputs are added
to the list of variables to be differentiated.
"""
self.__output_names = output_names
self.__mdo_formulation = mdo_formulation
self.__discipline = discipline
self.__top_level_disc = top_level_disc
self.__x_names = x_names
self.__all_data_names = all_data_names
self.__differentiable = differentiable
if self.__discipline is None:
self.__gen = self.__mdo_formulation._get_generator_from(
self.__output_names, top_level_disc=self.__top_level_disc
)
self.__discipline = self.__gen.discipline
else:
self.__gen = MDOFunctionGenerator(self.__discipline)
if self.__x_names is None:
self.__x_names = self.__mdo_formulation.get_x_names_of_disc(
self.__discipline
)
self.__out_x_func = self.__gen.get_function(
self.__x_names, self.__output_names, differentiable=self.__differentiable
)
super(FunctionFromDiscipline, self).__init__(
self._func,
jac=self._func_jac,
name=self.__out_x_func.name,
f_type=MDOFunction.TYPE_OBJ,
args=self.__x_names,
expr=self.__out_x_func.expr,
dim=self.__out_x_func.dim,
outvars=self.__out_x_func.outvars,
)
def _func(
self,
x_vect, # type: ndarray
): # type: (...) -> ndarray
"""Compute the outputs.
Args:
x_vect: The design variable vector.
Returns:
The value of the outputs.
"""
x_of_disc = self.__mdo_formulation.mask_x_swap_order(
self.__x_names, x_vect, self.__all_data_names
)
obj_allx_val = self.__out_x_func(x_of_disc)
return obj_allx_val
def _func_jac(
self, x_vect # type: ndarray
): # type: (...) -> ndarray
"""Compute the gradient of the outputs.
Args:
x_vect: The design variable vector.
Returns:
The value of the gradient of the outputs.
"""
x_of_disc = self.__mdo_formulation.mask_x_swap_order(
self.__x_names, x_vect, self.__all_data_names
)
loc_jac = self.__out_x_func.jac(x_of_disc) # pylint: disable=E1102
if len(loc_jac.shape) == 1:
# This is surprising but there is a duality between the
# masking operation in the function inputs and the
# unmasking of its outputs
jac = self.__mdo_formulation.unmask_x_swap_order(
self.__x_names, loc_jac, self.__all_data_names
)
else:
n_outs = loc_jac.shape[0]
jac = empty((n_outs, x_vect.size), dtype=x_vect.dtype)
for func_ind in range(n_outs):
gr_u = self.__mdo_formulation.unmask_x_swap_order(
self.__x_names, loc_jac[func_ind, :], self.__all_data_names
)
jac[func_ind, :] = gr_u
return jac
