# -*- coding: utf-8 -*-
# Copyright (C) 2010 Anders Logg
#
# This file is part of FFC.
#
# FFC is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# FFC 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 FFC. If not, see <http://www.gnu.org/licenses/>.
#
# First added: 2010-01-25
# Last changed: 2014-04-15
# FFC modules
from ffc.log import debug, error
# FFC tensor representation modules
from ffc.tensor.monomialextraction import extract_monomial_form
from ffc.tensor.monomialtransformation import transform_monomial_form
[docs]def estimate_cost(integral, function_replace_map):
"""
Estimate cost of tensor representation for integral. The cost is
computed as the sum of the number of coefficients and derivatives,
if the integrand can be represented as a monomial, and -1 if not.
"""
# Check that integral type is supported
supported = ["cell", "exterior_facet", "interior_facet"]
if not integral.integral_type() in supported:
return -1
# Extract monomial integrand
integrand = integral.integrand()
try:
monomial_form = extract_monomial_form([integrand], function_replace_map)
transform_monomial_form(monomial_form)
except Exception as exception:
debug("Monomial extraction failed: " + str(exception))
return -1
# Check that we get just one integrand
if not len(monomial_form) == 1:
error("Expecting just one integrand.")
# Compute cost
cost = 0
for integrand in monomial_form:
for monomial in integrand.monomials:
cost = max(cost, len(monomial.coefficients) + len(monomial.transforms))
return cost