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// SPDX-License-Identifier: Apache-2.0
//
// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
// Copyright 2008-2016 National ICT Australia (NICTA)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------
//! \addtogroup gmm_misc
//! @{
struct gmm_dist_mode { const uword id; inline constexpr explicit gmm_dist_mode(const uword in_id) : id(in_id) {} };
inline bool operator==(const gmm_dist_mode& a, const gmm_dist_mode& b) { return (a.id == b.id); }
inline bool operator!=(const gmm_dist_mode& a, const gmm_dist_mode& b) { return (a.id != b.id); }
struct gmm_dist_eucl : public gmm_dist_mode { inline constexpr gmm_dist_eucl() : gmm_dist_mode(1) {} };
struct gmm_dist_maha : public gmm_dist_mode { inline constexpr gmm_dist_maha() : gmm_dist_mode(2) {} };
struct gmm_dist_prob : public gmm_dist_mode { inline constexpr gmm_dist_prob() : gmm_dist_mode(3) {} };
static constexpr gmm_dist_eucl eucl_dist;
static constexpr gmm_dist_maha maha_dist;
static constexpr gmm_dist_prob prob_dist;
struct gmm_seed_mode { const uword id; inline constexpr explicit gmm_seed_mode(const uword in_id) : id(in_id) {} };
inline bool operator==(const gmm_seed_mode& a, const gmm_seed_mode& b) { return (a.id == b.id); }
inline bool operator!=(const gmm_seed_mode& a, const gmm_seed_mode& b) { return (a.id != b.id); }
struct gmm_seed_keep_existing : public gmm_seed_mode { inline constexpr gmm_seed_keep_existing() : gmm_seed_mode(1) {} };
struct gmm_seed_static_subset : public gmm_seed_mode { inline constexpr gmm_seed_static_subset() : gmm_seed_mode(2) {} };
struct gmm_seed_static_spread : public gmm_seed_mode { inline constexpr gmm_seed_static_spread() : gmm_seed_mode(3) {} };
struct gmm_seed_random_subset : public gmm_seed_mode { inline constexpr gmm_seed_random_subset() : gmm_seed_mode(4) {} };
struct gmm_seed_random_spread : public gmm_seed_mode { inline constexpr gmm_seed_random_spread() : gmm_seed_mode(5) {} };
static constexpr gmm_seed_keep_existing keep_existing;
static constexpr gmm_seed_static_subset static_subset;
static constexpr gmm_seed_static_spread static_spread;
static constexpr gmm_seed_random_subset random_subset;
static constexpr gmm_seed_random_spread random_spread;
namespace gmm_priv
{
template<typename eT> class gmm_diag;
template<typename eT> class gmm_full;
struct gmm_empty_arg {};
// running_mean_scalar
template<typename eT>
class running_mean_scalar
{
public:
inline running_mean_scalar();
inline running_mean_scalar(const running_mean_scalar& in_rms);
inline const running_mean_scalar& operator=(const running_mean_scalar& in_rms);
arma_hot inline void operator() (const eT X);
inline void reset();
inline uword count() const;
inline eT mean() const;
private:
arma_aligned uword counter;
arma_aligned eT r_mean;
};
// distance
template<typename eT, uword dist_id>
struct distance {};
template<typename eT>
struct distance<eT, uword(1)>
{
arma_inline static eT eval(const uword N, const eT* A, const eT* B, const eT*);
};
template<typename eT>
struct distance<eT, uword(2)>
{
arma_inline static eT eval(const uword N, const eT* A, const eT* B, const eT* C);
};
}
//! @}
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