From 926f502ca731fa49bcdf949408ce25728616e5f2 Mon Sep 17 00:00:00 2001 From: Murray Kornelsen Date: Wed, 13 Jul 2022 21:22:39 -0400 Subject: Adding GELU activation OpenCL implementation uses built in erf. NEON implementation requires new vectorized erf. Uses the following approximation: erf(x) = 1 - 1 / (1 + a1x + a2x^2 + a3x^3 + a4x^4)^4 a1 = 0.278393, a2 = 0.230389, a3 = 0.000972, a4 = 0.078108 From https://en.wikipedia.org/wiki/Error_function#Numerical_approximations Signed-off-by: Murray Kornelsen Change-Id: I2d3964b2c26a4334166b17135f9104bc6324fad2 Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/7921 Reviewed-by: Viet-Hoa Do Reviewed-by: Pablo Marquez Tello Comments-Addressed: Arm Jenkins Comments-Addressed: Pablo Marquez Tello Tested-by: Arm Jenkins Benchmark: Arm Jenkins --- src/core/CL/cl_kernels/activation_float_helpers.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'src/core/CL/cl_kernels/activation_float_helpers.h') diff --git a/src/core/CL/cl_kernels/activation_float_helpers.h b/src/core/CL/cl_kernels/activation_float_helpers.h index 91d7197889..3f93c8d6fc 100644 --- a/src/core/CL/cl_kernels/activation_float_helpers.h +++ b/src/core/CL/cl_kernels/activation_float_helpers.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2019-2020 Arm Limited. + * Copyright (c) 2019-2020, 2022 Arm Limited. * * SPDX-License-Identifier: MIT * @@ -69,6 +69,9 @@ // Linear Activation #define linear_op(DATA_TYPE, VEC_SIZE, x, A_VAL, B_VAL) (MLA((DATA_TYPE)B_VAL, (DATA_TYPE)A_VAL, x)) +// GELU Activation +#define gelu_op(DATA_TYPE, VEC_SIZE, x, A_VAL, B_VAL) (x * (DATA_TYPE)0.5 * ((DATA_TYPE)1.0 + erf(x / (DATA_TYPE)1.41421356237))) + // Identity Activation #define identity_op(DATA_TYPE, VEC_SIZE, x, A_VAL, B_VAL) (x) -- cgit v1.2.1