158 lines
4.0 KiB
C++
158 lines
4.0 KiB
C++
// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
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// Copyright 2008-2016 National ICT Australia (NICTA)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ------------------------------------------------------------------------
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//! \addtogroup spglue_kron
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//! @{
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template<typename T1, typename T2>
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inline
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void
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spglue_kron::apply(SpMat<typename T1::elem_type>& out, const SpGlue<T1,T2,spglue_kron>& X)
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{
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arma_extra_debug_sigprint();
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typedef typename T1::elem_type eT;
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const unwrap_spmat<T1> UA(X.A);
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const unwrap_spmat<T2> UB(X.B);
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if(UA.is_alias(out) || UB.is_alias(out))
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{
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SpMat<eT> tmp;
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spglue_kron::apply_noalias(tmp, UA.M, UB.M);
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out.steal_mem(tmp);
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}
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else
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{
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spglue_kron::apply_noalias(out, UA.M, UB.M);
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}
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}
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template<typename eT>
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inline
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void
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spglue_kron::apply_noalias(SpMat<eT>& out, const SpMat<eT>& A, const SpMat<eT>& B)
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{
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arma_extra_debug_sigprint();
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const uword A_n_rows = A.n_rows;
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const uword A_n_cols = A.n_cols;
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const uword B_n_rows = B.n_rows;
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const uword B_n_cols = B.n_cols;
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const uword out_n_nonzero = A.n_nonzero * B.n_nonzero;
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out.reserve(A_n_rows * B_n_rows, A_n_cols * B_n_cols, out_n_nonzero);
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if(out_n_nonzero == 0) { return; }
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access::rw(out.col_ptrs[0]) = 0;
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uword count = 0;
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for(uword A_col=0; A_col < A_n_cols; ++A_col)
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for(uword B_col=0; B_col < B_n_cols; ++B_col)
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{
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for(uword A_i = A.col_ptrs[A_col]; A_i < A.col_ptrs[A_col+1]; ++A_i)
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{
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const uword out_row = A.row_indices[A_i] * B_n_rows;
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const eT A_val = A.values[A_i];
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for(uword B_i = B.col_ptrs[B_col]; B_i < B.col_ptrs[B_col+1]; ++B_i)
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{
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access::rw(out.values[count]) = A_val * B.values[B_i];
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access::rw(out.row_indices[count]) = out_row + B.row_indices[B_i];
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count++;
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}
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}
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access::rw(out.col_ptrs[A_col * B_n_cols + B_col + 1]) = count;
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}
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}
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// template<typename T1, typename T2>
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// inline
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// void
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// spglue_kron::apply(SpMat<typename T1::elem_type>& out, const SpGlue<T1,T2,spglue_kron>& X)
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// {
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// arma_extra_debug_sigprint();
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//
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// typedef typename T1::elem_type eT;
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//
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// const unwrap_spmat<T1> UA(X.A);
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// const unwrap_spmat<T2> UB(X.B);
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//
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// const SpMat<eT>& A = UA.M;
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// const SpMat<eT>& B = UB.M;
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//
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// umat locs(2, A.n_nonzero * B.n_nonzero, arma_nozeros_indicator());
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// Col<eT> vals( A.n_nonzero * B.n_nonzero, arma_nozeros_indicator());
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//
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// uword* locs_mem = locs.memptr();
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// eT* vals_mem = vals.memptr();
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//
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// typename SpMat<eT>::const_iterator A_it = A.begin();
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// typename SpMat<eT>::const_iterator A_it_end = A.end();
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//
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// typename SpMat<eT>::const_iterator B_it_start = B.begin();
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// typename SpMat<eT>::const_iterator B_it_end = B.end();
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//
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// const uword B_n_rows = B.n_rows;
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// const uword B_n_cols = B.n_cols;
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//
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// uword i = 0;
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//
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// while(A_it != A_it_end)
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// {
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// typename SpMat<eT>::const_iterator B_it = B_it_start;
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//
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// const uword loc_row = A_it.row() * B_n_rows;
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// const uword loc_col = A_it.col() * B_n_cols;
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//
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// const eT A_val = (*A_it);
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//
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// while(B_it != B_it_end)
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// {
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// (*locs_mem) = loc_row + B_it.row(); locs_mem++;
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// (*locs_mem) = loc_col + B_it.col(); locs_mem++;
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//
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// vals_mem[i] = A_val * (*B_it);
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//
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// ++i;
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// ++B_it;
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// }
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//
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// ++A_it;
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// }
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//
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// out = SpMat<eT>(locs, vals, A.n_rows*B.n_rows, A.n_cols*B.n_cols);
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// }
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//! @}
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