From 58c5794b917dae10ff115dd85ec69e2ca41136c1 Mon Sep 17 00:00:00 2001 From: Gian Marco Date: Tue, 28 Nov 2017 09:10:03 +0000 Subject: COMPMID-706 - Add GEMMLowp output stage for scaling by a fixed point number DoD: - Implement NEON kernel for quantizing down the gemmlowp result. The result should be scaled by a fixedpoint number - Implement OpenCL kernel for quantizing down the gemmlowp result. The result should be scaled by a fixedpoint number - Add test for validating the result Required for: - Integration of GEMMLowp in Android NN - Convolution quantized - Fully connected quantized Change-Id: Ia963d25d695471e963961fb49a5600e78374ac4f Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/110981 Tested-by: BSG Visual Compute Jenkins server to access repositories on http://mpd-gerrit.cambridge.arm.com Reviewed-by: Georgios Pinitas Reviewed-by: Anthony Barbier --- .../runtime/NEON/functions/NEGEMMLowpOutputStage.h | 66 +++++++++++++++++++++- 1 file changed, 64 insertions(+), 2 deletions(-) (limited to 'arm_compute/runtime/NEON/functions/NEGEMMLowpOutputStage.h') diff --git a/arm_compute/runtime/NEON/functions/NEGEMMLowpOutputStage.h b/arm_compute/runtime/NEON/functions/NEGEMMLowpOutputStage.h index 533a41c888..8a3d3e73d4 100644 --- a/arm_compute/runtime/NEON/functions/NEGEMMLowpOutputStage.h +++ b/arm_compute/runtime/NEON/functions/NEGEMMLowpOutputStage.h @@ -47,14 +47,14 @@ class ITensor; * * In case the bias tensor is provided, the final result is: * - * ((input[i][k] + result_offset) * result_mult_int + bias[k]) >> result_shift + * ((input[i][k] + bias[k] + result_offset) * result_mult_int) >> result_shift * * This function calls the following NEON kernels: * * -# @ref NEGEMMLowpQuantizeDownInt32ToUint8ScaleKernel * * @note The function accepts also 2 optional input arguments (min and max) which can be used to implement "rectified linear unit" activation functions - * before the result is shifted right by result_shift + * after the result is shifted right by result_shift */ class NEGEMMLowpQuantizeDownInt32ToUint8Scale : public INESimpleFunction { @@ -82,6 +82,68 @@ public: * @param[in] min (Optional) Min value used to saturate down the output result before converting back to QASYMM8 * @param[in] max (Optional) Max value used to saturate up the output result before converting back to QASYMM8, * Along with @p min, this value can be used to implement "rectified linear unit" activation functions + * + * @return an error status + */ + static Error validate(const ITensorInfo *input, const ITensorInfo *bias, const ITensorInfo *output, int min = 0, int max = 0); +}; + +/** Basic function to execute NEGEMMLowpQuantizeDownInt32ToUint8ScaleByFixedPoint on NEON. + * + * NEGEMMLowpQuantizeDownInt32ToUint8ScaleByFixedPoint depends on 3 parameters: + * + * result_fixedpoint_multiplier, result_shift, result_offset_after_shift + * + * The final result is: + * + * (FixedPointMul(input[i][k], result_fixedpoint_multiplier) >> result_shift) + result_offset_after_shift + * + * where FixedPointMul(x, y) is the nearest integer to the following + * mathematical expression, evaluated without overflow or intermediate rounding: + * + * (x * y) / 2^31 + * + * For more information: https://github.com/google/gemmlowp/blob/master/public/output_stages.h#L68 + * + * In case the bias tensor is provided, the final result is: + * + * ((FixedPointMul(input[i][k] + bias[k], result_fixedpoint_multiplier)) >> result_shift) + result_offset_after_shift + * + * This function calls the following NEON kernels: + * + * -# @ref NEGEMMLowpQuantizeDownInt32ToUint8ScaleByFixedPointKernel + * + * @note The function accepts also 2 optional input arguments (min and max) which can be used to implement "rectified linear unit" activation functions + * after the result is shifted right by result_shift +*/ +class NEGEMMLowpQuantizeDownInt32ToUint8ScaleByFixedPoint : public INESimpleFunction +{ +public: + /** Initialise the kernel's inputs, output + * + * @param[in] input Input tensor. Data type supported: S32 + * @param[in] bias Biases tensor. Only shared biases supported and it can be a nullptr if the biases addition is not required. + * Biases are 1D tensor with dimensions [OFM]. Data type supported: Same as @p input. + * @param[out] output Output tensor. Data type supported: Data type supported: QASYMM8 + * @param[in] result_fixedpoint_multiplier Fixed point value to be multiplied to each element of the input matrix when once the result_offset has been add + * @param[in] result_shift Number of bits to shift right the result after the fixed point multiplication + * @param[in] result_offset_after_shift Offset to be applied to result before converting it back to QASYMM8 + * @param[in] min (Optional) Min value used to saturate down the output result before converting back to QASYMM8 + * @param[in] max (Optional) Max value used to saturate up the output result before converting back to QASYMM8, + * Along with @p min, this value can be used to implement "rectified linear unit" activation functions + */ + void configure(const ITensor *input, const ITensor *bias, ITensor *output, int result_fixedpoint_multiplier, int result_shift, int result_offset_after_shift, int min = 0, int max = 0); + /** Static function to check if given info will lead to a valid configuration of @ref NEGEMMLowpQuantizeDownInt32ToUint8ScaleByFixedPoint + * + * @param[in] input Input tensor. It is the output of @ref NEGEMMLowpMatrixMultiplyCore function. Data type supported: S32 + * @param[in] bias Biases tensor. Only shared biases supported and it can be a nullptr if the addition of biases is not required. + * Biases are 1D tensor with dimensions [OFM]. Data type supported: Same as @p input. + * @param[in] output Output tensor. Data type supported: Data type supported: QASYMM8 + * @param[in] min (Optional) Min value used to saturate down the output result before converting back to QASYMM8 + * @param[in] max (Optional) Max value used to saturate up the output result before converting back to QASYMM8, + * Along with @p min, this value can be used to implement "rectified linear unit" activation functions + * + * @return an error status */ static Error validate(const ITensorInfo *input, const ITensorInfo *bias, const ITensorInfo *output, int min = 0, int max = 0); }; -- cgit v1.2.1