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| author |  Michael Figurnov <mfigurnov@google.com> | 2018-06-06 18:49:26 +0100 |
|---|---|---|
| committer | Michael Figurnov <mfigurnov@google.com> | 2018-06-06 18:49:26 +0100 |
| commit | 4bd158fa37b4bba74e6421575d5c69eeea547172 (patch) | |
| tree | 940bd1497831563a1792aea863ce9e2a9afd0b45 /Eigen | |
| parent | e206f8d4a401fe2060bada4d4b5d92e3bf3b561c (diff) | |
Derivative of the incomplete Gamma function and the sample of a Gamma random variable.
In addition to igamma(a, x), this code implements:
* igamma_der_a(a, x) = d igamma(a, x) / da -- derivative of igamma with respect to the parameter
* gamma_sample_der_alpha(alpha, sample) -- reparameterization derivative of a Gamma(alpha, 1) random variable sample with respect to the alpha parameter
The derivatives are computed by forward mode differentiation of the igamma(a, x) code. Although gamma_sample_der_alpha can be implemented via igamma_der_a, a separate function is more accurate and efficient due to analytical cancellation of some terms. All three functions are implemented by a method parameterized with "mode" that always computes the derivatives, but does not return them unless required by the mode. The compiler is expected to (and, based on benchmarks, does) skip the unnecessary computations depending on the mode.
Diffstat (limited to 'Eigen')
| -rw-r--r-- | Eigen/src/Core/GenericPacketMath.h | 2 | ||||
| -rw-r--r-- | Eigen/src/Core/arch/CUDA/PacketMath.h | 4 |
2 files changed, 6 insertions, 0 deletions
diff --git a/Eigen/src/Core/GenericPacketMath.h b/Eigen/src/Core/GenericPacketMath.h index 888a3f7ea..55b6a89e2 100644 --- a/Eigen/src/Core/GenericPacketMath.h +++ b/Eigen/src/Core/GenericPacketMath.h @@ -85,6 +85,8 @@ struct default_packet_traits HasI0e = 0, HasI1e = 0, HasIGamma = 0, + HasIGammaDerA = 0, + HasGammaSampleDerAlpha = 0, HasIGammac = 0, HasBetaInc = 0, diff --git a/Eigen/src/Core/arch/CUDA/PacketMath.h b/Eigen/src/Core/arch/CUDA/PacketMath.h index 704a4e0d9..ab8e477f4 100644 --- a/Eigen/src/Core/arch/CUDA/PacketMath.h +++ b/Eigen/src/Core/arch/CUDA/PacketMath.h @@ -47,6 +47,8 @@ template<> struct packet_traits<float> : default_packet_traits HasI0e = 1, HasI1e = 1, HasIGamma = 1, + HasIGammaDerA = 1, + HasGammaSampleDerAlpha = 1, HasIGammac = 1, HasBetaInc = 1, @@ -78,6 +80,8 @@ template<> struct packet_traits<double> : default_packet_traits HasI0e = 1, HasI1e = 1, HasIGamma = 1, + HasIGammaDerA = 1, + HasGammaSampleDerAlpha = 1, HasIGammac = 1, HasBetaInc = 1, |