BayesOpt
kernel_rq.hpp
1 /*
2 -------------------------------------------------------------------------
3  This file is part of BayesOpt, an efficient C++ library for
4  Bayesian optimization.
5 
6  Copyright (C) 2011-2015 Ruben Martinez-Cantin <rmcantin@unizar.es>
7 
8  BayesOpt is free software: you can redistribute it and/or modify it
9  under the terms of the GNU Affero General Public License as published by
10  the Free Software Foundation, either version 3 of the License, or
11  (at your option) any later version.
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13  BayesOpt is distributed in the hope that it will be useful, but
14  WITHOUT ANY WARRANTY; without even the implied warranty of
15  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  GNU Affero General Public License for more details.
17 
18  You should have received a copy of the GNU Affero General Public License
19  along with BayesOpt. If not, see <http://www.gnu.org/licenses/>.
20 ------------------------------------------------------------------------
21 */
22 
23 #ifndef _KERNEL_RQ_HPP_
24 #define _KERNEL_RQ_HPP_
25 
27 
28 namespace bayesopt
29 {
30 
33 
35  class RQIso: public ISOkernel
36  {
37  public:
38  void init(size_t input_dim)
39  { n_params = 2; n_inputs = input_dim; };
40 
41  double operator()( const vectord &x1, const vectord &x2)
42  {
43  double rl = computeWeightedNorm2(x1,x2);
44  double k = rl*rl/(2*params(1));
45  return std::pow(1+k,-params(1));
46  };
47 
48  // TODO:
49  double gradient(const vectord &x1, const vectord &x2,
50  size_t component)
51  { assert(false); return 0.0; };
52  };
53 
55 
56 } //namespace bayesopt
57 
58 #endif
Abstract class for isotropic kernel functors.
Namespace of the library interface.
Definition: using.dox:1
Rational quadratic (Student&#39;s t) kernel.
Definition: kernel_rq.hpp:35
Atomic (simple) kernel functions.