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Added support for sigmoid function to the tensor module

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This commit is contained in:
Benoit Steiner
2015-07-17 09:29:00 -07:00
parent 979b73cebf
commit 06a22ca5bd
5 changed files with 84 additions and 0 deletions
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6
unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
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@@ -116,6 +116,12 @@ class TensorBase<Derived, ReadOnlyAccessors>
return unaryExpr(internal::scalar_tanh_op<Scalar>());
}
EIGEN_DEVICE_FUNC
EIGEN_STRONG_INLINE const TensorCwiseUnaryOp<internal::scalar_sigmoid_op<Scalar>, const Derived>
sigmoid() const {
return unaryExpr(internal::scalar_sigmoid_op<Scalar>());
}
EIGEN_DEVICE_FUNC
EIGEN_STRONG_INLINE const TensorCwiseUnaryOp<internal::scalar_exp_op<Scalar>, const Derived>
exp() const {

30
unsupported/Eigen/CXX11/src/Tensor/TensorFunctors.h
View File

@@ -13,6 +13,36 @@
namespace Eigen {
namespace internal {
/** \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 + std::exp(-x));
}
template <typename Packet>
inline Packet packetOp(const Packet& x) const {
const Packet one = pset1<Packet>(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
};
};
// Standard reduction functors
template <typename T> struct SumReducer
{