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diff --git a/third_party/eigen3/Eigen/src/Core/Visitor.h b/third_party/eigen3/Eigen/src/Core/Visitor.h
deleted file mode 100644
index 64867b7a2c..0000000000
--- a/third_party/eigen3/Eigen/src/Core/Visitor.h
+++ /dev/null
@@ -1,237 +0,0 @@
-// This file is part of Eigen, a lightweight C++ template library
-// for linear algebra.
-//
-// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
-//
-// This Source Code Form is subject to the terms of the Mozilla
-// Public License v. 2.0. If a copy of the MPL was not distributed
-// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-#ifndef EIGEN_VISITOR_H
-#define EIGEN_VISITOR_H
-
-namespace Eigen { 
-
-namespace internal {
-
-template<typename Visitor, typename Derived, int UnrollCount>
-struct visitor_impl
-{
-  enum {
-    col = (UnrollCount-1) / Derived::RowsAtCompileTime,
-    row = (UnrollCount-1) % Derived::RowsAtCompileTime
-  };
-
-  static inline void run(const Derived &mat, Visitor& visitor)
-  {
-    visitor_impl<Visitor, Derived, UnrollCount-1>::run(mat, visitor);
-    visitor(mat.coeff(row, col), row, col);
-  }
-};
-
-template<typename Visitor, typename Derived>
-struct visitor_impl<Visitor, Derived, 1>
-{
-  static inline void run(const Derived &mat, Visitor& visitor)
-  {
-    return visitor.init(mat.coeff(0, 0), 0, 0);
-  }
-};
-
-template<typename Visitor, typename Derived>
-struct visitor_impl<Visitor, Derived, Dynamic>
-{
-  typedef typename Derived::Index Index;
-  static inline void run(const Derived& mat, Visitor& visitor)
-  {
-    visitor.init(mat.coeff(0,0), 0, 0);
-    for(Index i = 1; i < mat.rows(); ++i)
-      visitor(mat.coeff(i, 0), i, 0);
-    for(Index j = 1; j < mat.cols(); ++j)
-      for(Index i = 0; i < mat.rows(); ++i)
-        visitor(mat.coeff(i, j), i, j);
-  }
-};
-
-} // end namespace internal
-
-/** Applies the visitor \a visitor to the whole coefficients of the matrix or vector.
-  *
-  * The template parameter \a Visitor is the type of the visitor and provides the following interface:
-  * \code
-  * struct MyVisitor {
-  *   // called for the first coefficient
-  *   void init(const Scalar& value, Index i, Index j);
-  *   // called for all other coefficients
-  *   void operator() (const Scalar& value, Index i, Index j);
-  * };
-  * \endcode
-  *
-  * \note compared to one or two \em for \em loops, visitors offer automatic
-  * unrolling for small fixed size matrix.
-  *
-  * \sa minCoeff(Index*,Index*), maxCoeff(Index*,Index*), DenseBase::redux()
-  */
-template<typename Derived>
-template<typename Visitor>
-void DenseBase<Derived>::visit(Visitor& visitor) const
-{
-  enum { unroll = SizeAtCompileTime != Dynamic
-                   && CoeffReadCost != Dynamic
-                   && (SizeAtCompileTime == 1 || internal::functor_traits<Visitor>::Cost != Dynamic)
-                   && SizeAtCompileTime * CoeffReadCost + (SizeAtCompileTime-1) * internal::functor_traits<Visitor>::Cost
-                      <= EIGEN_UNROLLING_LIMIT };
-  return internal::visitor_impl<Visitor, Derived,
-      unroll ? int(SizeAtCompileTime) : Dynamic
-    >::run(derived(), visitor);
-}
-
-namespace internal {
-
-/** \internal
-  * \brief Base class to implement min and max visitors
-  */
-template <typename Derived>
-struct coeff_visitor
-{
-  typedef typename Derived::Index Index;
-  typedef typename Derived::Scalar Scalar;
-  Index row, col;
-  Scalar res;
-  inline void init(const Scalar& value, Index i, Index j)
-  {
-    res = value;
-    row = i;
-    col = j;
-  }
-};
-
-/** \internal
-  * \brief Visitor computing the min coefficient with its value and coordinates
-  *
-  * \sa DenseBase::minCoeff(Index*, Index*)
-  */
-template <typename Derived>
-struct min_coeff_visitor : coeff_visitor<Derived>
-{
-  typedef typename Derived::Index Index;
-  typedef typename Derived::Scalar Scalar;
-  void operator() (const Scalar& value, Index i, Index j)
-  {
-    if(value < this->res)
-    {
-      this->res = value;
-      this->row = i;
-      this->col = j;
-    }
-  }
-};
-
-template<typename Scalar>
-struct functor_traits<min_coeff_visitor<Scalar> > {
-  enum {
-    Cost = NumTraits<Scalar>::AddCost
-  };
-};
-
-/** \internal
-  * \brief Visitor computing the max coefficient with its value and coordinates
-  *
-  * \sa DenseBase::maxCoeff(Index*, Index*)
-  */
-template <typename Derived>
-struct max_coeff_visitor : coeff_visitor<Derived>
-{
-  typedef typename Derived::Index Index;
-  typedef typename Derived::Scalar Scalar;
-  void operator() (const Scalar& value, Index i, Index j)
-  {
-    if(value > this->res)
-    {
-      this->res = value;
-      this->row = i;
-      this->col = j;
-    }
-  }
-};
-
-template<typename Scalar>
-struct functor_traits<max_coeff_visitor<Scalar> > {
-  enum {
-    Cost = NumTraits<Scalar>::AddCost
-  };
-};
-
-} // end namespace internal
-
-/** \returns the minimum of all coefficients of *this and puts in *row and *col its location.
-  * \warning the result is undefined if \c *this contains NaN.
-  *
-  * \sa DenseBase::minCoeff(Index*), DenseBase::maxCoeff(Index*,Index*), DenseBase::visitor(), DenseBase::minCoeff()
-  */
-template<typename Derived>
-template<typename IndexType>
-typename internal::traits<Derived>::Scalar
-DenseBase<Derived>::minCoeff(IndexType* rowId, IndexType* colId) const
-{
-  internal::min_coeff_visitor<Derived> minVisitor;
-  this->visit(minVisitor);
-  *rowId = minVisitor.row;
-  if (colId) *colId = minVisitor.col;
-  return minVisitor.res;
-}
-
-/** \returns the minimum of all coefficients of *this and puts in *index its location.
-  * \warning the result is undefined if \c *this contains NaN. 
-  *
-  * \sa DenseBase::minCoeff(IndexType*,IndexType*), DenseBase::maxCoeff(IndexType*,IndexType*), DenseBase::visitor(), DenseBase::minCoeff()
-  */
-template<typename Derived>
-template<typename IndexType>
-typename internal::traits<Derived>::Scalar
-DenseBase<Derived>::minCoeff(IndexType* index) const
-{
-  EIGEN_STATIC_ASSERT_VECTOR_ONLY(Derived)
-  internal::min_coeff_visitor<Derived> minVisitor;
-  this->visit(minVisitor);
-  *index = (RowsAtCompileTime==1) ? minVisitor.col : minVisitor.row;
-  return minVisitor.res;
-}
-
-/** \returns the maximum of all coefficients of *this and puts in *row and *col its location.
-  * \warning the result is undefined if \c *this contains NaN. 
-  *
-  * \sa DenseBase::minCoeff(IndexType*,IndexType*), DenseBase::visitor(), DenseBase::maxCoeff()
-  */
-template<typename Derived>
-template<typename IndexType>
-typename internal::traits<Derived>::Scalar
-DenseBase<Derived>::maxCoeff(IndexType* rowPtr, IndexType* colPtr) const
-{
-  internal::max_coeff_visitor<Derived> maxVisitor;
-  this->visit(maxVisitor);
-  *rowPtr = maxVisitor.row;
-  if (colPtr) *colPtr = maxVisitor.col;
-  return maxVisitor.res;
-}
-
-/** \returns the maximum of all coefficients of *this and puts in *index its location.
-  * \warning the result is undefined if \c *this contains NaN.
-  *
-  * \sa DenseBase::maxCoeff(IndexType*,IndexType*), DenseBase::minCoeff(IndexType*,IndexType*), DenseBase::visitor(), DenseBase::maxCoeff()
-  */
-template<typename Derived>
-template<typename IndexType>
-typename internal::traits<Derived>::Scalar
-DenseBase<Derived>::maxCoeff(IndexType* index) const
-{
-  EIGEN_STATIC_ASSERT_VECTOR_ONLY(Derived)
-  internal::max_coeff_visitor<Derived> maxVisitor;
-  this->visit(maxVisitor);
-  *index = (RowsAtCompileTime==1) ? maxVisitor.col : maxVisitor.row;
-  return maxVisitor.res;
-}
-
-} // end namespace Eigen
-
-#endif // EIGEN_VISITOR_H