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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,87 +1,57 @@ | ||
| """Algorithms for renumbering of counted objects, currently variables and indices.""" | ||
| # Copyright (C) 2008-2016 Martin Sandve Alnæs and Anders Logg | ||
| # Copyright (C) 2008-2024 Martin Sandve Alnæs, Anders Logg, Jørgen S. Dokken and Lawrence Mitchell | ||
| # | ||
| # This file is part of UFL (https://www.fenicsproject.org) | ||
| # | ||
| # SPDX-License-Identifier: LGPL-3.0-or-later | ||
|
|
||
| from ufl.algorithms.transformer import ReuseTransformer, apply_transformer | ||
| from ufl.classes import Zero | ||
| from ufl.core.expr import Expr | ||
| from ufl.core.multiindex import FixedIndex, Index, MultiIndex | ||
| from ufl.variable import Label, Variable | ||
| from collections import defaultdict | ||
| from itertools import count as _count | ||
|
|
||
| from ufl.algorithms.map_integrands import map_integrand_dags | ||
| from ufl.core.multiindex import Index | ||
| from ufl.corealg.multifunction import MultiFunction | ||
|
|
||
| class VariableRenumberingTransformer(ReuseTransformer): | ||
| """Variable renumbering transformer.""" | ||
|
|
||
| def __init__(self): | ||
| """Initialise.""" | ||
| ReuseTransformer.__init__(self) | ||
| self.variable_map = {} | ||
|
|
||
| def variable(self, o): | ||
| """Apply to variable.""" | ||
| e, l = o.ufl_operands # noqa: E741 | ||
| v = self.variable_map.get(l) | ||
| if v is None: | ||
| e = self.visit(e) | ||
| l2 = Label(len(self.variable_map)) | ||
| v = Variable(e, l2) | ||
| self.variable_map[l] = v | ||
| return v | ||
|
|
||
| class IndexRelabeller(MultiFunction): | ||
| """Renumber indices to have a consistent index numbering starting from 0.""" | ||
|
|
||
| class IndexRenumberingTransformer(VariableRenumberingTransformer): | ||
| """Index renumbering transformer. | ||
| def __init__(self): | ||
| """Initialize index relabeller with a zero count.""" | ||
| super().__init__() | ||
| count = _count() | ||
| self.index_cache = defaultdict(lambda: Index(next(count))) | ||
|
|
||
| This is a poorly designed algorithm. It is used in some tests, | ||
| please do not use for anything else. | ||
| """ | ||
| expr = MultiFunction.reuse_if_untouched | ||
|
|
||
| def __init__(self): | ||
| """Initialise.""" | ||
| VariableRenumberingTransformer.__init__(self) | ||
| self.index_map = {} | ||
| def multi_index(self, o): | ||
| """Apply to multi-indices.""" | ||
| return type(o)( | ||
| tuple(self.index_cache[i] if isinstance(i, Index) else i for i in o.indices()) | ||
| ) | ||
|
|
||
| def zero(self, o): | ||
| """Apply to zero.""" | ||
| fi = o.ufl_free_indices | ||
| fid = o.ufl_index_dimensions | ||
| mapped_fi = tuple(self.index(Index(count=i)) for i in fi) | ||
| paired_fid = [(mapped_fi[pos], fid[pos]) for pos, a in enumerate(fi)] | ||
| new_fi, new_fid = zip(*tuple(sorted(paired_fid))) | ||
| return Zero(o.ufl_shape, new_fi, new_fid) | ||
|
|
||
| def index(self, o): | ||
| """Apply to index.""" | ||
| if isinstance(o, FixedIndex): | ||
| new_indices = [self.index_cache[Index(i)].count() for i in fi] | ||
| if fi == () and fid == (): | ||
| return o | ||
| else: | ||
| c = o._count | ||
| i = self.index_map.get(c) | ||
| if i is None: | ||
| i = Index(count=len(self.index_map)) | ||
| self.index_map[c] = i | ||
| return i | ||
| new_fi, new_fid = zip(*sorted(zip(new_indices, fid), key=lambda x: x[0])) | ||
| return type(o)(o.ufl_shape, tuple(new_fi), tuple(new_fid)) | ||
|
|
||
| def multi_index(self, o): | ||
| """Apply to multi_index.""" | ||
| new_indices = tuple(self.index(i) for i in o.indices()) | ||
| return MultiIndex(new_indices) | ||
|
|
||
| def renumber_indices(form): | ||
| """Renumber indices to have a consistent index numbering starting from 0. | ||
| def renumber_indices(expr): | ||
| """Renumber indices.""" | ||
| if isinstance(expr, Expr): | ||
| num_free_indices = len(expr.ufl_free_indices) | ||
| This is useful to avoid multiple kernels for the same integrand, | ||
| but with different subdomain ids. | ||
| result = apply_transformer(expr, IndexRenumberingTransformer()) | ||
| Args: | ||
| form: A UFL form, integral or expression. | ||
| if isinstance(expr, Expr): | ||
| if num_free_indices != len(result.ufl_free_indices): | ||
| raise ValueError( | ||
| "The number of free indices left in expression " | ||
| "should be invariant w.r.t. renumbering." | ||
| ) | ||
| return result | ||
| Returns: | ||
| A new form, integral or expression with renumbered indices. | ||
| """ | ||
| reindexer = IndexRelabeller() | ||
| return map_integrand_dags(reindexer, form) |