steepest_descent.py 1.25 KB
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# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
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#
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# Copyright(C) 2013-2018 Max-Planck-Society
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#
# NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
# and financially supported by the Studienstiftung des deutschen Volkes.
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from __future__ import absolute_import, division, print_function
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from ..compat import *
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from .descent_minimizer import DescentMinimizer
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class SteepestDescent(DescentMinimizer):
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    """ Implementation of the steepest descent minimization scheme.
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    Also known as 'gradient descent'. This algorithm simply follows the
    functional's gradient for minimization.
    """
    def get_descent_direction(self, energy):
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        return -energy.gradient