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author | Miao Wang <miaowang@google.com> | 2017-07-18 16:57:47 -0700 |
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committer | Miao Wang <miaowang@google.com> | 2017-07-26 03:53:47 +0000 |
commit | e241ae53c5a2c986c6077fac054d74f648079ea6 (patch) | |
tree | 3ff1e643f70aad062b94a29f53ea8f422ed59e18 /Eigen/src/Core | |
parent | 52289ab445e4f09a541e9845e46c3898c992e2f3 (diff) | |
download | eigen-e241ae53c5a2c986c6077fac054d74f648079ea6.tar.gz |
Add sigmoid functors to Eigen/Core.
- Workaround to resolve Android NN API dependency.
Test: mm
Test: nnapi_example tests all pass
Change-Id: I9818787c3c6b46bb0cf3b91b31be20e7fa8955e5
Diffstat (limited to 'Eigen/src/Core')
-rw-r--r-- | Eigen/src/Core/functors/UnaryFunctors.h | 31 |
1 files changed, 31 insertions, 0 deletions
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 * |