Source code for gemseo.problems.scalable.data_driven.model

# -*- coding: utf-8 -*-
# Copyright 2021 IRT Saint Exupéry,
# 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
# 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 - initial API and implementation and/or
#                  initial documentation
#        :author:  Matthias De Lozzo
Scalable model

This module implements the abstract concept of scalable model
which is used by scalable disciplines. A scalable model is built
from a input-output learning dataset associated with a function
and generalizing its behavior to a new user-defined problem dimension,
that is to say new user-defined input and output dimensions.

The concept of scalable model is implemented
through :class:`.ScalableModel`, an abstract class which is instantiated from:

- data provided as a :class:`.Dataset`
- variables sizes provided as a dictionary
  whose keys are the names of inputs and outputs
  and values are their new sizes.
  If a variable is missing, its original size is considered.

Scalable model parameters can also be filled in.
Otherwise the model uses default values.

.. seealso::

   The :class:`.ScalableDiagonalModel` class overloads :class:`.ScalableModel`.
from __future__ import division, unicode_literals

import logging

from numpy import ones, where, zeros

from gemseo.core.dataset import Dataset

LOGGER = logging.getLogger(__name__)

[docs]class ScalableModel(object): """Scalable model.""" ABBR = "sm" def __init__(self, data, sizes=None, **parameters): """Constructor. :param Dataset data: learning dataset. :param dict sizes: sizes of input and output variables. If None, use the original sizes. Default: None. :param parameters: model parameters """ sizes = sizes or {} = self.ABBR + "_" + = data self.sizes = self._set_sizes(sizes) self.parameters = parameters self.lower_bounds, self.upper_bounds = self.compute_bounds() self.normalize_data() self.lower_bounds, self.upper_bounds = self.compute_bounds() self.default_inputs = self._set_default_inputs() self.model = self.build_model() def _set_default_inputs(self): """Sets the default values of inputs from the model. :return: default inputs. :rtype: dict """ default_inputs = {} for name in self.inputs_names: default_inputs[name] = 0.5 * ones(self.sizes[name]) return default_inputs
[docs] def scalable_function(self, input_value=None): """Evaluate the scalable function. :param dict input_value: input values. If None, use default inputs. Default: None. :return: evaluation of the scalable function. :rtype: dict """ raise NotImplementedError
[docs] def scalable_derivatives(self, input_value=None): """Evaluate the scalable derivatives. :param dict input_value: input values. If None, use default inputs. Default: None :return: evaluation of the scalable derivatives. :rtype: dict """ raise NotImplementedError
[docs] def compute_bounds(self): """Compute lower and upper bounds of both input and output variables. :return: lower bounds, upper bounds. :rtype: dict, dict """ inputs =, True) outputs =, True) lower_bounds = {name: value.min(0) for name, value in inputs.items()} lower_bounds.update({name: value.min(0) for name, value in outputs.items()}) upper_bounds = {name: value.max(0) for name, value in inputs.items()} upper_bounds.update({name: value.max(0) for name, value in outputs.items()}) return lower_bounds, upper_bounds
[docs] def normalize_data(self): """Normalize dataset from lower and upper bounds.""" normalized_data = Dataset() inputs =, True) for name in data = inputs[name] - self.lower_bounds[name] data /= self.upper_bounds[name] - self.lower_bounds[name] normalized_data.add_variable(name, data,, True) outputs =, True) for name in indices = where(self.lower_bounds[name] == self.upper_bounds[name])[0] data = zeros(outputs[name].shape) if len(indices) != 0: data[:, indices] = zeros((data.shape[0], len(indices))) + 0.5 self.lower_bounds[name][indices] = zeros(len(indices)) + 0.5 self.upper_bounds[name][indices] = zeros(len(indices)) + 0.5 indices = where(self.lower_bounds[name] != self.upper_bounds[name])[0] value = outputs[name][:, indices] lower_bound = self.lower_bounds[name][indices] upper_bound = self.upper_bounds[name][indices] data[:, indices] = (value - lower_bound) / (upper_bound - lower_bound) normalized_data.add_variable(name, data,, True) = normalized_data
[docs] def build_model(self): """Build model with original sizes for input and output variables.""" raise NotImplementedError
@property def original_sizes(self): """Original sizes of variables. :return: original sizes of variables. :rtype: dict """ return @property def outputs_names(self): """Outputs names. :return: names of the outputs. :rtype: list(str) """ return sorted( @property def inputs_names(self): """Inputs names. :return: names of the inputs. :rtype: list(str) """ return sorted( def _set_sizes(self, sizes): """Set the new sizes of input and output variables. :param sizes: new sizes of some variables. :return: new sizes of all variables. :rtype: dict """ for group in [,]: for name in original_size = self.original_sizes.get(name) sizes[name] = sizes.get(name, original_size) return sizes