101 lines
2.2 KiB
C++
101 lines
2.2 KiB
C++
/*******************************************************************************
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* Copyright (c) 2015-2018 Skymind, Inc.
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*
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* This program and the accompanying materials are made available under the
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* terms of the Apache License, Version 2.0 which is available at
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* https://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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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* SPDX-License-Identifier: Apache-2.0
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******************************************************************************/
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//
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// Created by Yurii Shyrma on 02.01.2018
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//
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#ifndef LIBND4J_HHSEQUENCE_H
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#define LIBND4J_HHSEQUENCE_H
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#include "array/NDArray.h"
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namespace sd {
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namespace ops {
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namespace helpers {
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class HHsequence {
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public:
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/*
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* matrix containing the Householder vectors
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*/
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NDArray _vectors;
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/*
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* vector containing the Householder coefficients
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*/
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NDArray _coeffs;
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/*
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* shift of the Householder sequence
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*/
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int _shift;
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/*
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* length of the Householder sequence
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*/
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int _diagSize;
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/*
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* type of sequence, type = 'u' (acting on columns, left) or type = 'v' (acting on rows, right)
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*/
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char _type;
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/*
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* constructor
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*/
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HHsequence(const NDArray& vectors, const NDArray& coeffs, const char type);
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/**
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* this method mathematically multiplies input matrix on Householder sequence from the left H0*H1*...Hn * matrix
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*
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* matrix - input matrix to be multiplied
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*/
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template <typename T>
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void _mulLeft(NDArray& matrix);
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void mulLeft(NDArray& matrix);
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NDArray getTail(const int idx) const;
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template <typename T>
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void _applyTo(NDArray& dest);
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void applyTo(NDArray& dest);
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FORCEINLINE int rows() const;
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};
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//////////////////////////////////////////////////////////////////////////
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FORCEINLINE int HHsequence::rows() const {
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return _type == 'u' ? _vectors.sizeAt(0) : _vectors.sizeAt(1);
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}
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}
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}
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}
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#endif //LIBND4J_HHSEQUENCE_H
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