diff options
-rw-r--r-- | Android.bp | 1 | ||||
-rw-r--r-- | Eigen/src/Core/functors/UnaryFunctors.h | 31 |
2 files changed, 32 insertions, 0 deletions
diff --git a/Android.bp b/Android.bp index 78a86fb7d..6603f2bb6 100644 --- a/Android.bp +++ b/Android.bp @@ -15,6 +15,7 @@ cc_library_headers { export_include_dirs = [ "." ], name: "libeigen", + vendor_available: true, host_supported: true, } diff --git a/Eigen/src/Core/functors/UnaryFunctors.h b/Eigen/src/Core/functors/UnaryFunctors.h index 2e6a00ffd..581a3c93a 100644 --- a/Eigen/src/Core/functors/UnaryFunctors.h +++ b/Eigen/src/Core/functors/UnaryFunctors.h @@ -14,6 +14,37 @@ namespace Eigen { namespace internal { +// Copied from unsupported/Eigen/CXX11/src/Tensor/TensorFunctors.h +// TODO: remove or update after upstream +/** \internal + * \brief Template functor to compute the sigmoid of a scalar + * \sa class CwiseUnaryOp, ArrayBase::sigmoid() + */ +template <typename T> +struct scalar_sigmoid_op { + EIGEN_EMPTY_STRUCT_CTOR(scalar_sigmoid_op) + EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE T operator()(const T& x) const { + const T one = T(1); + return one / (one + numext::exp(-x)); + } + + template <typename Packet> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE + Packet packetOp(const Packet& x) const { + const Packet one = pset1<Packet>(T(1)); + return pdiv(one, padd(one, pexp(pnegate(x)))); + } +}; + +template <typename T> +struct functor_traits<scalar_sigmoid_op<T> > { + enum { + Cost = NumTraits<T>::AddCost * 2 + NumTraits<T>::MulCost * 6, + PacketAccess = packet_traits<T>::HasAdd && packet_traits<T>::HasDiv && + packet_traits<T>::HasNegate && packet_traits<T>::HasExp + }; +}; + + /** \internal * \brief Template functor to compute the opposite of a scalar * |