Source code for ufl.algorithms.ad

# -*- coding: utf-8 -*-
"""Front-end for AD routines."""

# Copyright (C) 2008-2016 Martin Sandve Alnæs
#
# This file is part of UFL (https://www.fenicsproject.org)
#
# SPDX-License-Identifier:    LGPL-3.0-or-later
#
# Modified by Anders Logg, 2009.

from ufl.log import warning
from ufl.algorithms.apply_algebra_lowering import apply_algebra_lowering
from ufl.algorithms.apply_derivatives import apply_derivatives


[docs]def expand_derivatives(form, **kwargs): """Expand all derivatives of expr. In the returned expression g which is mathematically equivalent to expr, there are no VariableDerivative or CoefficientDerivative objects left, and Grad objects have been propagated to Terminal nodes. """ # For a deprecation period (I see that dolfin-adjoint passes some # args here) if kwargs: warning("Deprecation: expand_derivatives no longer takes any keyword arguments") # Lower abstractions for tensor-algebra types into index notation form = apply_algebra_lowering(form) # Apply differentiation form = apply_derivatives(form) return form