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73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
// This file is part of Eigen, a lightweight C++ template library
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// for linear algebra.
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//
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// Copyright (C) 2014 Benoit Steiner <benoit.steiner.goog@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla
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// Public License v. 2.0. If a copy of the MPL was not distributed
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// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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#include "main.h"
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#include <Eigen/CXX11/Tensor>
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using Eigen::Tensor;
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static void test_simple_reshape()
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{
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Tensor<float, 5> tensor1(2,3,1,7,1);
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tensor1.setRandom();
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Tensor<float, 3> tensor2(2,3,7);
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Tensor<float, 2> tensor3(6,7);
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Tensor<float, 2> tensor4(2,21);
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Tensor<float, 3>::Dimensions dim1{{2,3,7}};
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tensor2 = tensor1.reshape(dim1);
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Tensor<float, 2>::Dimensions dim2{{6,7}};
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tensor3 = tensor1.reshape(dim2);
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Tensor<float, 2>::Dimensions dim3{{2,21}};
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tensor4 = tensor1.reshape(dim1).reshape(dim3);
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for (int i = 0; i < 2; ++i) {
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for (int j = 0; j < 3; ++j) {
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for (int k = 0; k < 7; ++k) {
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VERIFY_IS_EQUAL(tensor1(i,j,0,k,0), tensor2(i,j,k));
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VERIFY_IS_EQUAL(tensor1(i,j,0,k,0), tensor3(i+2*j,k));
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VERIFY_IS_EQUAL(tensor1(i,j,0,k,0), tensor4(i,j+3*k));
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}
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}
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}
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}
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static void test_reshape_in_expr() {
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MatrixXf m1(2,3*5*7*11);
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MatrixXf m2(3*5*7*11,13);
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m1.setRandom();
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m2.setRandom();
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MatrixXf m3 = m1 * m2;
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TensorMap<Tensor<float, 5>> tensor1(m1.data(), 2,3,5,7,11);
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TensorMap<Tensor<float, 5>> tensor2(m2.data(), 3,5,7,11,13);
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Tensor<float, 2>::Dimensions newDims1{{2,3*5*7*11}};
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Tensor<float, 2>::Dimensions newDims2{{3*5*7*11,13}};
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typedef Tensor<float, 1>::DimensionPair DimPair;
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array<DimPair, 1> contract_along{{DimPair(1, 0)}};
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Tensor<float, 2> tensor3(2,13);
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tensor3 = tensor1.reshape(newDims1).contract(tensor2.reshape(newDims2), contract_along);
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Map<MatrixXf> res(tensor3.data(), 2, 13);
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for (int i = 0; i < 2; ++i) {
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for (int j = 0; j < 13; ++j) {
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VERIFY_IS_APPROX(res(i,j), m3(i,j));
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}
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}
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}
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void test_cxx11_tensor_morphing()
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{
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CALL_SUBTEST(test_simple_reshape());
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CALL_SUBTEST(test_reshape_in_expr());
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}
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