# ____________________________________________________________________________________
#
# Pyomo: Python Optimization Modeling Objects
# Copyright (c) 2008-2026 National Technology and Engineering Solutions of Sandia, LLC
# Under the terms of Contract DE-NA0003525 with National Technology and Engineering
# Solutions of Sandia, LLC, the U.S. Government retains certain rights in this
# software. This software is distributed under the 3-clause BSD License.
# ____________________________________________________________________________________
"""A library of possible callbacks to use for initializing the NLP subproblems.
However, it seems likely that problem-specific routines might be better, in
which case you can write your own, and specify it in the
'subproblem_initialization_method' argument."""
def _restore_vars_from_nlp_block_saved_values(nlp_util_block):
for var, old_value in nlp_util_block.initial_var_values.items():
if not var.fixed and var.is_continuous():
if old_value is not None:
# Adjust value if it falls outside the bounds
if var.has_lb() and old_value < var.lb:
old_value = var.lb
if var.has_ub() and old_value > var.ub:
old_value = var.ub
# Set the value
var.set_value(old_value)
# This is the original GDPopt behavior:
[docs]
def restore_vars_to_original_values(solver, nlp_util_block, mip_util_block):
"""Perform initialization of the subproblem.
This just restores the continuous variables to the original
model values, which were saved on the subproblem's utility block when it
was created.
"""
# restore original continuous variable values
_restore_vars_from_nlp_block_saved_values(nlp_util_block)
# This is the default for the enumerate algorithm
[docs]
def restore_vars_to_original_values_enumerate(
true_disjuncts, boolean_var_values, discrete_var_values, nlp_util_block
):
"""Perform initialization of the subproblem.
This just restores the continuous variables to the original
model values, which were saved on the subproblem's utility block when it
was created.
"""
# restore original continuous variable values
_restore_vars_from_nlp_block_saved_values(nlp_util_block)