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| 56 | mjames | 1 | /* |
| 2 | * Copyright (C) 2010-2018 Arm Limited or its affiliates. All rights reserved. |
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| 3 | * |
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| 4 | * SPDX-License-Identifier: Apache-2.0 |
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| 5 | * |
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| 6 | * Licensed under the Apache License, Version 2.0 (the License); you may |
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| 7 | * not use this file except in compliance with the License. |
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| 8 | * You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an AS IS BASIS, WITHOUT |
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| 14 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | |||
| 19 | /* ---------------------------------------------------------------------- |
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| 20 | * Project: CMSIS NN Library |
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| 21 | * Title: arm_convolve_HWC_q7_RGB.c |
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| 22 | * Description: Q7 version of convolution for RGB image |
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| 23 | * |
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| 24 | * $Date: 17. January 2018 |
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| 25 | * $Revision: V.1.0.0 |
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| 26 | * |
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| 27 | * Target Processor: Cortex-M cores |
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| 28 | * |
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| 29 | * -------------------------------------------------------------------- */ |
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| 30 | #include "arm_math.h" |
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| 31 | #include "arm_nnfunctions.h" |
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| 32 | |||
| 33 | /** |
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| 34 | * @ingroup groupNN |
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| 35 | */ |
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| 36 | |||
| 37 | /** |
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| 38 | * @addtogroup NNConv |
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| 39 | * @{ |
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| 40 | */ |
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| 41 | |||
| 42 | /** |
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| 43 | * @brief Q7 convolution function for RGB image |
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| 44 | * @param[in] Im_in pointer to input tensor |
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| 45 | * @param[in] dim_im_in input tensor dimention |
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| 46 | * @param[in] ch_im_in number of input tensor channels |
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| 47 | * @param[in] wt pointer to kernel weights |
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| 48 | * @param[in] ch_im_out number of filters, i.e., output tensor channels |
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| 49 | * @param[in] dim_kernel filter kernel size |
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| 50 | * @param[in] padding padding sizes |
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| 51 | * @param[in] stride convolution stride |
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| 52 | * @param[in] bias pointer to bias |
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| 53 | * @param[in] bias_shift amount of left-shift for bias |
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| 54 | * @param[in] out_shift amount of right-shift for output |
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| 55 | * @param[in,out] Im_out pointer to output tensor |
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| 56 | * @param[in] dim_im_out output tensor dimension |
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| 57 | * @param[in,out] bufferA pointer to buffer space for input |
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| 58 | * @param[in,out] bufferB pointer to buffer space for output |
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| 59 | * @return The function returns either |
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| 60 | * <code>ARM_MATH_SIZE_MISMATCH</code> or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking. |
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| 61 | * |
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| 62 | * @details |
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| 63 | * |
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| 64 | * <b>Buffer size:</b> |
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| 65 | * |
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| 66 | * bufferA size: 2*ch_im_in*dim_kernel*dim_kernel |
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| 67 | * |
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| 68 | * bufferB size: 0 |
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| 69 | * |
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| 70 | * <b>Input dimension constraints:</b> |
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| 71 | * |
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| 72 | * ch_im_in equals 3 |
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| 73 | * |
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| 74 | * This kernel is written exclusively for convolution with ch_im_in |
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| 75 | * equals 3. This applies on the first layer of CNNs which has input |
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| 76 | * image with RGB format. |
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| 77 | */ |
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| 78 | |||
| 79 | arm_status |
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| 80 | arm_convolve_HWC_q7_RGB(const q7_t * Im_in, |
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| 81 | const uint16_t dim_im_in, |
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| 82 | const uint16_t ch_im_in, |
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| 83 | const q7_t * wt, |
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| 84 | const uint16_t ch_im_out, |
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| 85 | const uint16_t dim_kernel, |
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| 86 | const uint16_t padding, |
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| 87 | const uint16_t stride, |
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| 88 | const q7_t * bias, |
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| 89 | const uint16_t bias_shift, |
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| 90 | const uint16_t out_shift, |
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| 91 | q7_t * Im_out, const uint16_t dim_im_out, q15_t * bufferA, q7_t * bufferB) |
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| 92 | { |
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| 93 | |||
| 94 | #if defined (ARM_MATH_DSP) |
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| 95 | /* Run the following code for Cortex-M4 and Cortex-M7 */ |
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| 96 | int16_t i_out_y, i_out_x, i_ker_y, i_ker_x; |
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| 97 | |||
| 98 | /* |
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| 99 | * Here we use bufferA as q15_t internally as computation are done with q15_t level |
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| 100 | * im2col are done to output in q15_t format from q7_t input |
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| 101 | */ |
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| 102 | q15_t *pBuffer = bufferA; |
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| 103 | q7_t *pOut = Im_out; |
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| 104 | |||
| 105 | // check if number of input channels is 3 |
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| 106 | if (ch_im_in != 3) |
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| 107 | { |
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| 108 | return ARM_MATH_SIZE_MISMATCH; |
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| 109 | } |
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| 110 | // This part implements the im2col function |
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| 111 | for (i_out_y = 0; i_out_y < dim_im_out; i_out_y++) |
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| 112 | { |
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| 113 | for (i_out_x = 0; i_out_x < dim_im_out; i_out_x++) |
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| 114 | { |
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| 115 | for (i_ker_y = i_out_y * stride - padding; i_ker_y < i_out_y * stride - padding + dim_kernel; i_ker_y++) |
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| 116 | { |
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| 117 | for (i_ker_x = i_out_x * stride - padding; i_ker_x < i_out_x * stride - padding + dim_kernel; i_ker_x++) |
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| 118 | { |
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| 119 | if (i_ker_y < 0 || i_ker_y >= dim_im_in || i_ker_x < 0 || i_ker_x >= dim_im_in) |
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| 120 | { |
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| 121 | /* Equivalent to arm_fill_q15(0, pBuffer, ch_im_in) with assumption: ch_im_in = 3 */ |
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| 122 | *__SIMD32(pBuffer) = 0x0; |
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| 123 | *(pBuffer + 2) = 0; |
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| 124 | pBuffer += 3; |
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| 125 | } else |
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| 126 | { |
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| 127 | /* |
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| 128 | * Equivalent to: |
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| 129 | * arm_q7_to_q15_no_shift( (q7_t*)Im_in+(i_ker_y*dim_im_in+i_ker_x)*3, pBuffer, 3); |
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| 130 | */ |
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| 131 | |||
| 132 | const q7_t *pPixel = Im_in + (i_ker_y * dim_im_in + i_ker_x) * 3; |
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| 133 | q31_t buf = *__SIMD32(pPixel); |
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| 134 | |||
| 135 | union arm_nnword top; |
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| 136 | union arm_nnword bottom; |
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| 137 | |||
| 138 | top.word = __SXTB16(buf); |
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| 139 | bottom.word = __SXTB16(__ROR(buf, 8)); |
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| 140 | |||
| 141 | #ifndef ARM_MATH_BIG_ENDIAN |
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| 142 | /* |
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| 143 | * little-endian, | omit | 3rd | 2nd | 1st | |
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| 144 | * MSB LSB |
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| 145 | * top | 3rd | 1st |; bottom | omit | 2nd | |
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| 146 | * |
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| 147 | * version 1, need to swap 2nd and 3rd weight |
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| 148 | * *__SIMD32(pBuffer) = top.word; |
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| 149 | * *(pBuffer+2) = bottom.half_words[0]; |
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| 150 | * |
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| 151 | * version 2, no weight shuffling required |
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| 152 | */ |
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| 153 | *pBuffer++ = top.half_words[0]; |
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| 154 | *__SIMD32(pBuffer) = __PKHBT(bottom.word, top.word, 0); |
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| 155 | #else |
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| 156 | /* |
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| 157 | * big-endian, | 1st | 2nd | 3rd | omit | |
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| 158 | * MSB LSB |
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| 159 | * top | 2nd | omit |; bottom | 1st | 3rd | |
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| 160 | * |
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| 161 | * version 1, need to swap 2nd and 3rd weight |
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| 162 | * *__SIMD32(pBuffer) = bottom.word; |
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| 163 | * *(pBuffer+2) = top.half_words[1]; |
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| 164 | * |
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| 165 | * version 2, no weight shuffling required |
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| 166 | */ |
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| 167 | *pBuffer++ = bottom.half_words[0]; |
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| 168 | *__SIMD32(pBuffer) = __PKHTB(top.word, bottom.word, 0); |
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| 169 | #endif |
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| 170 | pBuffer += 2; |
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| 171 | } |
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| 172 | } |
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| 173 | } |
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| 174 | |||
| 175 | if (pBuffer == bufferA + 2 * 3 * dim_kernel * dim_kernel) |
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| 176 | { |
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| 177 | pOut = |
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| 178 | arm_nn_mat_mult_kernel_q7_q15(wt, bufferA, |
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| 179 | ch_im_out, |
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| 180 | 3 * dim_kernel * dim_kernel, bias_shift, out_shift, bias, pOut); |
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| 181 | |||
| 182 | /* counter reset */ |
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| 183 | pBuffer = bufferA; |
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| 184 | } |
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| 185 | } |
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| 186 | } |
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| 187 | |||
| 188 | /* left-over because odd number of output pixels */ |
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| 189 | if (pBuffer != bufferA) |
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| 190 | { |
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| 191 | const q7_t *pA = wt; |
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| 192 | int i; |
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| 193 | |||
| 194 | for (i = 0; i < ch_im_out; i++) |
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| 195 | { |
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| 196 | q31_t sum = ((q31_t)bias[i] << bias_shift) + NN_ROUND(out_shift); |
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| 197 | q15_t *pB = bufferA; |
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| 198 | /* basically each time it process 4 entries */ |
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| 199 | uint16_t colCnt = 3 * dim_kernel * dim_kernel >> 2; |
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| 200 | |||
| 201 | while (colCnt) |
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| 202 | { |
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| 203 | |||
| 204 | q31_t inA1, inA2; |
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| 205 | q31_t inB1, inB2; |
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| 206 | |||
| 207 | pA = (q7_t *) read_and_pad((void *)pA, &inA1, &inA2); |
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| 208 | |||
| 209 | inB1 = *__SIMD32(pB)++; |
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| 210 | sum = __SMLAD(inA1, inB1, sum); |
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| 211 | inB2 = *__SIMD32(pB)++; |
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| 212 | sum = __SMLAD(inA2, inB2, sum); |
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| 213 | |||
| 214 | colCnt--; |
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| 215 | } |
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| 216 | colCnt = 3 * dim_kernel * dim_kernel & 0x3; |
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| 217 | while (colCnt) |
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| 218 | { |
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| 219 | q7_t inA1 = *pA++; |
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| 220 | q15_t inB1 = *pB++; |
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| 221 | sum += inA1 * inB1; |
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| 222 | colCnt--; |
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| 223 | } |
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| 224 | *pOut++ = (q7_t) __SSAT((sum >> out_shift), 8); |
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| 225 | } |
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| 226 | } |
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| 227 | #else |
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| 228 | /* Run the following code as reference implementation for Cortex-M0 and Cortex-M3 */ |
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| 229 | |||
| 230 | uint16_t i, j, k, l, m, n; |
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| 231 | int conv_out; |
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| 232 | signed char in_row, in_col; |
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| 233 | |||
| 234 | // check if number of input channels is 3 |
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| 235 | if (ch_im_in != 3) |
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| 236 | { |
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| 237 | return ARM_MATH_SIZE_MISMATCH; |
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| 238 | } |
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| 239 | |||
| 240 | for (i = 0; i < ch_im_out; i++) |
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| 241 | { |
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| 242 | for (j = 0; j < dim_im_out; j++) |
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| 243 | { |
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| 244 | for (k = 0; k < dim_im_out; k++) |
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| 245 | { |
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| 246 | conv_out = (bias[i] << bias_shift) + NN_ROUND(out_shift); |
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| 247 | for (m = 0; m < dim_kernel; m++) |
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| 248 | { |
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| 249 | for (n = 0; n < dim_kernel; n++) |
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| 250 | { |
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| 251 | /* if-for implementation */ |
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| 252 | in_row = stride * j + m - padding; |
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| 253 | in_col = stride * k + n - padding; |
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| 254 | if (in_row >= 0 && in_col >= 0 && in_row < dim_im_in && in_col < dim_im_in) |
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| 255 | { |
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| 256 | for (l = 0; l < ch_im_in; l++) |
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| 257 | { |
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| 258 | conv_out += |
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| 259 | Im_in[(in_row * dim_im_in + in_col) * ch_im_in + |
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| 260 | l] * wt[i * ch_im_in * dim_kernel * dim_kernel + (m * dim_kernel + |
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| 261 | n) * ch_im_in + l]; |
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| 262 | } |
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| 263 | } |
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| 264 | } |
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| 265 | } |
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| 266 | Im_out[i + (j * dim_im_out + k) * ch_im_out] = (q7_t) __SSAT((conv_out >> out_shift), 8); |
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| 267 | } |
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| 268 | } |
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| 269 | } |
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| 270 | |||
| 271 | #endif /* ARM_MATH_DSP */ |
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| 272 | |||
| 273 | /* Return to application */ |
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| 274 | return (ARM_MATH_SUCCESS); |
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| 275 | } |
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| 276 | |||
| 277 | /** |
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| 278 | * @} end of NNConv group |
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| 279 | */ |