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diff --git a/src/armadillo/include/armadillo_bits/gmm_misc_bones.hpp b/src/armadillo/include/armadillo_bits/gmm_misc_bones.hpp
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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);
+  };
+
+
+}
+
+
+//! @}