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  • 2022.1
  • 04/11/2022
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CNN f32 training example

This C API example demonstrates how to build an AlexNet model training. The example implements a few layers from AlexNet model.
/******************************************************************************* * Copyright 2016-2021 Intel Corporation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *******************************************************************************/ // Required for posix_memalign #define _POSIX_C_SOURCE 200112L #include <stdio.h> #include <stdlib.h> #include <string.h> #include "oneapi/dnnl/dnnl.h" #include "example_utils.h" #define BATCH 8 #define IC 3 #define OC 96 #define CONV_IH 227 #define CONV_IW 227 #define CONV_OH 55 #define CONV_OW 55 #define CONV_STRIDE 4 #define CONV_PAD 0 #define POOL_OH 27 #define POOL_OW 27 #define POOL_STRIDE 2 #define POOL_PAD 0 static size_t product(dnnl_dim_t *arr, size_t size) { size_t prod = 1; for (size_t i = 0; i < size; ++i) prod *= arr[i]; return prod; } static void init_net_data(float *data, uint32_t dim, const dnnl_dim_t *dims) { if (dim == 1) { for (dnnl_dim_t i = 0; i < dims[0]; ++i) { data[i] = (float)(i % 1637); } } else if (dim == 4) { for (dnnl_dim_t in = 0; in < dims[0]; ++in) for (dnnl_dim_t ic = 0; ic < dims[1]; ++ic) for (dnnl_dim_t ih = 0; ih < dims[2]; ++ih) for (dnnl_dim_t iw = 0; iw < dims[3]; ++iw) { dnnl_dim_t indx = in * dims[1] * dims[2] * dims[3] + ic * dims[2] * dims[3] + ih * dims[3] + iw; data[indx] = (float)(indx % 1637); } } } typedef struct { int nargs; dnnl_exec_arg_t *args; } args_t; static void prepare_arg_node(args_t *node, int nargs) { node->args = (dnnl_exec_arg_t *)malloc(sizeof(dnnl_exec_arg_t) * nargs); node->nargs = nargs; } static void free_arg_node(args_t *node) { free(node->args); } static void set_arg(dnnl_exec_arg_t *arg, int arg_idx, dnnl_memory_t memory) { arg->arg = arg_idx; arg->memory = memory; } static void init_data_memory(uint32_t dim, const dnnl_dim_t *dims, dnnl_format_tag_t user_tag, dnnl_engine_t engine, float *data, dnnl_memory_t *memory) { dnnl_memory_desc_t user_md; CHECK(dnnl_memory_desc_init_by_tag( &user_md, dim, dims, dnnl_f32, user_tag)); CHECK(dnnl_memory_create(memory, &user_md, engine, DNNL_MEMORY_ALLOCATE)); write_to_dnnl_memory(data, *memory); } dnnl_status_t prepare_reorder(dnnl_memory_t *user_memory, // in const dnnl_memory_desc_t *prim_memory_md, // in dnnl_engine_t prim_engine, // in: primitive's engine int dir_is_user_to_prim, // in: user -> prim or prim -> user dnnl_memory_t *prim_memory, // out: primitive's memory created dnnl_primitive_t *reorder, // out: reorder primitive created uint32_t *net_index, // primitive index in net (inc if reorder created) dnnl_primitive_t *net, args_t *net_args) { // net params const dnnl_memory_desc_t *user_memory_md; dnnl_memory_get_memory_desc(*user_memory, &user_memory_md); dnnl_engine_t user_mem_engine; dnnl_memory_get_engine(*user_memory, &user_mem_engine); if (!dnnl_memory_desc_equal(user_memory_md, prim_memory_md)) { CHECK(dnnl_memory_create(prim_memory, prim_memory_md, prim_engine, DNNL_MEMORY_ALLOCATE)); dnnl_primitive_desc_t reorder_pd; if (dir_is_user_to_prim) { CHECK(dnnl_reorder_primitive_desc_create(&reorder_pd, user_memory_md, user_mem_engine, prim_memory_md, prim_engine, NULL)); } else { CHECK(dnnl_reorder_primitive_desc_create(&reorder_pd, prim_memory_md, prim_engine, user_memory_md, user_mem_engine, NULL)); } CHECK(dnnl_primitive_create(reorder, reorder_pd)); CHECK(dnnl_primitive_desc_destroy(reorder_pd)); net[*net_index] = *reorder; prepare_arg_node(&net_args[*net_index], 2); set_arg(&net_args[*net_index].args[0], DNNL_ARG_FROM, dir_is_user_to_prim ? *user_memory : *prim_memory); set_arg(&net_args[*net_index].args[1], DNNL_ARG_TO, dir_is_user_to_prim ? *prim_memory : *user_memory); (*net_index)++; } else { *prim_memory = NULL; *reorder = NULL; } return dnnl_success; } void simple_net() { dnnl_engine_t engine; CHECK(dnnl_engine_create(&engine, dnnl_cpu, 0)); // idx // build a simple net uint32_t n_fwd = 0, n_bwd = 0; dnnl_primitive_t net_fwd[10], net_bwd[10]; args_t net_fwd_args[10], net_bwd_args[10]; const int ndims = 4; dnnl_dims_t net_src_sizes = {BATCH, IC, CONV_IH, CONV_IW}; dnnl_dims_t net_dst_sizes = {BATCH, OC, POOL_OH, POOL_OW}; float *net_src = (float *)malloc(product(net_src_sizes, ndims) * sizeof(float)); float *net_dst = (float *)malloc(product(net_dst_sizes, ndims) * sizeof(float)); init_net_data(net_src, ndims, net_src_sizes); memset(net_dst, 0, product(net_dst_sizes, ndims) * sizeof(float)); //---------------------------------------------------------------------- //----------------- Forward Stream ------------------------------------- // AlexNet: conv // {BATCH, IC, CONV_IH, CONV_IW} (x) {OC, IC, 11, 11} -> // {BATCH, OC, CONV_OH, CONV_OW} // strides: {CONV_STRIDE, CONV_STRIDE} dnnl_dims_t conv_user_src_sizes; for (int i = 0; i < ndims; i++) conv_user_src_sizes[i] = net_src_sizes[i]; dnnl_dims_t conv_user_weights_sizes = {OC, IC, 11, 11}; dnnl_dims_t conv_bias_sizes = {OC}; dnnl_dims_t conv_user_dst_sizes = {BATCH, OC, CONV_OH, CONV_OW}; dnnl_dims_t conv_strides = {CONV_STRIDE, CONV_STRIDE}; dnnl_dims_t conv_padding = {CONV_PAD, CONV_PAD}; float *conv_src = net_src; float *conv_weights = (float *)malloc( product(conv_user_weights_sizes, ndims) * sizeof(float)); float *conv_bias = (float *)malloc(product(conv_bias_sizes, 1) * sizeof(float)); init_net_data(conv_weights, ndims, conv_user_weights_sizes); init_net_data(conv_bias, 1, conv_bias_sizes); // create memory for user data dnnl_memory_t conv_user_src_memory, conv_user_weights_memory, conv_user_bias_memory; init_data_memory(ndims, conv_user_src_sizes, dnnl_nchw, engine, conv_src, &conv_user_src_memory); init_data_memory(ndims, conv_user_weights_sizes, dnnl_oihw, engine, conv_weights, &conv_user_weights_memory); init_data_memory(1, conv_bias_sizes, dnnl_x, engine, conv_bias, &conv_user_bias_memory); // create a convolution dnnl_primitive_desc_t conv_pd; { // create data descriptors for convolution w/ no specified format dnnl_memory_desc_t conv_src_md, conv_weights_md, conv_bias_md, conv_dst_md; CHECK(dnnl_memory_desc_init_by_tag(&conv_src_md, ndims, conv_user_src_sizes, dnnl_f32, dnnl_format_tag_any)); CHECK(dnnl_memory_desc_init_by_tag(&conv_weights_md, ndims, conv_user_weights_sizes, dnnl_f32, dnnl_format_tag_any)); CHECK(dnnl_memory_desc_init_by_tag( &conv_bias_md, 1, conv_bias_sizes, dnnl_f32, dnnl_x)); CHECK(dnnl_memory_desc_init_by_tag(&conv_dst_md, ndims, conv_user_dst_sizes, dnnl_f32, dnnl_format_tag_any)); dnnl_convolution_desc_t conv_any_desc; CHECK(dnnl_convolution_forward_desc_init(&conv_any_desc, dnnl_forward, dnnl_convolution_direct, &conv_src_md, &conv_weights_md, &conv_bias_md, &conv_dst_md, conv_strides, conv_padding, conv_padding)); CHECK(dnnl_primitive_desc_create( &conv_pd, &conv_any_desc, NULL, engine, NULL)); } dnnl_memory_t conv_internal_src_memory, conv_internal_weights_memory, conv_internal_dst_memory; // create memory for dst data, we don't need to reorder it to user data const dnnl_memory_desc_t *conv_dst_md = dnnl_primitive_desc_query_md(conv_pd, dnnl_query_dst_md, 0); CHECK(dnnl_memory_create(&conv_internal_dst_memory, conv_dst_md, engine, DNNL_MEMORY_ALLOCATE)); // create reorder primitives between user data and convolution srcs // if required dnnl_primitive_t conv_reorder_src, conv_reorder_weights; const dnnl_memory_desc_t *conv_src_md = dnnl_primitive_desc_query_md(conv_pd, dnnl_query_src_md, 0); CHECK(prepare_reorder(&conv_user_src_memory, conv_src_md, engine, 1, &conv_internal_src_memory, &conv_reorder_src, &n_fwd, net_fwd, net_fwd_args)); const dnnl_memory_desc_t *conv_weights_md = dnnl_primitive_desc_query_md(conv_pd, dnnl_query_weights_md, 0); CHECK(prepare_reorder(&conv_user_weights_memory, conv_weights_md, engine, 1, &conv_internal_weights_memory, &conv_reorder_weights, &n_fwd, net_fwd, net_fwd_args)); dnnl_memory_t conv_src_memory = conv_internal_src_memory ? conv_internal_src_memory : conv_user_src_memory; dnnl_memory_t conv_weights_memory = conv_internal_weights_memory ? conv_internal_weights_memory : conv_user_weights_memory; // finally create a convolution primitive dnnl_primitive_t conv; CHECK(dnnl_primitive_create(&conv, conv_pd)); net_fwd[n_fwd] = conv; prepare_arg_node(&net_fwd_args[n_fwd], 4); set_arg(&net_fwd_args[n_fwd].args[0], DNNL_ARG_SRC, conv_src_memory); set_arg(&net_fwd_args[n_fwd].args[1], DNNL_ARG_WEIGHTS, conv_weights_memory); set_arg(&net_fwd_args[n_fwd].args[2], DNNL_ARG_BIAS, conv_user_bias_memory); set_arg(&net_fwd_args[n_fwd].args[3], DNNL_ARG_DST, conv_internal_dst_memory); n_fwd++; // AlexNet: relu // {BATCH, OC, CONV_OH, CONV_OW} -> {BATCH, OC, CONV_OH, CONV_OW} float negative_slope = 0.0f; // keep memory format of source same as the format of convolution // output in order to avoid reorder const dnnl_memory_desc_t *relu_src_md = conv_dst_md; // create a relu primitive descriptor dnnl_eltwise_desc_t relu_desc; CHECK(dnnl_eltwise_forward_desc_init(&relu_desc, dnnl_forward, dnnl_eltwise_relu, relu_src_md, negative_slope, 0)); dnnl_primitive_desc_t relu_pd; CHECK(dnnl_primitive_desc_create(&relu_pd, &relu_desc, NULL, engine, NULL)); // create relu dst memory dnnl_memory_t relu_dst_memory; const dnnl_memory_desc_t *relu_dst_md = dnnl_primitive_desc_query_md(relu_pd, dnnl_query_dst_md, 0); CHECK(dnnl_memory_create( &relu_dst_memory, relu_dst_md, engine, DNNL_MEMORY_ALLOCATE)); // finally create a relu primitive dnnl_primitive_t relu; CHECK(dnnl_primitive_create(&relu, relu_pd)); net_fwd[n_fwd] = relu; prepare_arg_node(&net_fwd_args[n_fwd], 2); set_arg(&net_fwd_args[n_fwd].args[0], DNNL_ARG_SRC, conv_internal_dst_memory); set_arg(&net_fwd_args[n_fwd].args[1], DNNL_ARG_DST, relu_dst_memory); n_fwd++; // AlexNet: lrn // {BATCH, OC, CONV_OH, CONV_OW} -> {BATCH, OC, CONV_OH, CONV_OW} // local size: 5 // alpha: 0.0001 // beta: 0.75 // k: 1.0 uint32_t local_size = 5; float alpha = 0.0001f; float beta = 0.75f; float k = 1.0f; // create lrn src memory descriptor using dst memory descriptor // from previous primitive const dnnl_memory_desc_t *lrn_src_md = relu_dst_md; // create a lrn primitive descriptor dnnl_lrn_desc_t lrn_desc; CHECK(dnnl_lrn_forward_desc_init(&lrn_desc, dnnl_forward, dnnl_lrn_across_channels, lrn_src_md, local_size, alpha, beta, k)); dnnl_primitive_desc_t lrn_pd; CHECK(dnnl_primitive_desc_create(&lrn_pd, &lrn_desc, NULL, engine, NULL)); // create primitives for lrn dst and workspace memory dnnl_memory_t lrn_dst_memory, lrn_ws_memory; const dnnl_memory_desc_t *lrn_dst_md = dnnl_primitive_desc_query_md(lrn_pd, dnnl_query_dst_md, 0); CHECK(dnnl_memory_create( &lrn_dst_memory, lrn_dst_md, engine, DNNL_MEMORY_ALLOCATE)); // create workspace only in training and only for forward primitive // query lrn_pd for workspace, this memory will be shared with forward lrn const dnnl_memory_desc_t *lrn_ws_md = dnnl_primitive_desc_query_md(lrn_pd, dnnl_query_workspace_md, 0); CHECK(dnnl_memory_create( &lrn_ws_memory, lrn_ws_md, engine, DNNL_MEMORY_ALLOCATE)); // finally create a lrn primitive dnnl_primitive_t lrn; CHECK(dnnl_primitive_create(&lrn, lrn_pd)); net_fwd[n_fwd] = lrn; prepare_arg_node(&net_fwd_args[n_fwd], 3); set_arg(&net_fwd_args[n_fwd].args[0], DNNL_ARG_SRC, relu_dst_memory); set_arg(&net_fwd_args[n_fwd].args[1], DNNL_ARG_DST, lrn_dst_memory); set_arg(&net_fwd_args[n_fwd].args[2], DNNL_ARG_WORKSPACE, lrn_ws_memory); n_fwd++; // AlexNet: pool // {BATCH, OC, CONV_OH, CONV_OW} -> {BATCH, OC, POOL_OH, POOL_OW} // kernel: {3, 3} // strides: {POOL_STRIDE, POOL_STRIDE} // dilation: {0, 0} dnnl_dims_t pool_dst_sizes; for (int i = 0; i < ndims; i++) pool_dst_sizes[i] = net_dst_sizes[i]; dnnl_dims_t pool_kernel = {3, 3}; dnnl_dims_t pool_strides = {POOL_STRIDE, POOL_STRIDE}; dnnl_dims_t pool_padding = {POOL_PAD, POOL_PAD}; dnnl_dims_t pool_dilation = {0, 0}; // create memory for user dst data dnnl_memory_t pool_user_dst_memory; init_data_memory(4, pool_dst_sizes, dnnl_nchw, engine, net_dst, &pool_user_dst_memory); // create a pooling primitive descriptor dnnl_primitive_desc_t pool_pd; { // create pooling src memory descriptor using dst descriptor // from previous primitive const dnnl_memory_desc_t *pool_src_md = lrn_dst_md; // create descriptors for dst pooling data dnnl_memory_desc_t pool_dst_md; CHECK(dnnl_memory_desc_init_by_tag(&pool_dst_md, 4, pool_dst_sizes, dnnl_f32, dnnl_format_tag_any)); dnnl_pooling_v2_desc_t pool_desc; CHECK(dnnl_pooling_v2_forward_desc_init(&pool_desc, dnnl_forward, dnnl_pooling_max, pool_src_md, &pool_dst_md, pool_strides, pool_kernel, pool_dilation, pool_padding, pool_padding)); CHECK(dnnl_primitive_desc_create( &pool_pd, &pool_desc, NULL, engine, NULL)); } // create memory for workspace dnnl_memory_t pool_ws_memory; const dnnl_memory_desc_t *pool_ws_md = dnnl_primitive_desc_query_md(pool_pd, dnnl_query_workspace_md, 0); CHECK(dnnl_memory_create( &pool_ws_memory, pool_ws_md, engine, DNNL_MEMORY_ALLOCATE)); // create reorder primitives between pooling dsts and user format dst // if required dnnl_primitive_t pool_reorder_dst; dnnl_memory_t pool_internal_dst_memory; const dnnl_memory_desc_t *pool_dst_md = dnnl_primitive_desc_query_md(pool_pd, dnnl_query_dst_md, 0); n_fwd += 1; // tentative workaround: preserve space for pooling that should // happen before the reorder CHECK(prepare_reorder(&pool_user_dst_memory, pool_dst_md, engine, 0, &pool_internal_dst_memory, &pool_reorder_dst, &n_fwd, net_fwd, net_fwd_args)); n_fwd -= pool_reorder_dst ? 2 : 1; dnnl_memory_t pool_dst_memory = pool_internal_dst_memory ? pool_internal_dst_memory : pool_user_dst_memory; // finally create a pooling primitive dnnl_primitive_t pool; CHECK(dnnl_primitive_create(&pool, pool_pd)); net_fwd[n_fwd] = pool; prepare_arg_node(&net_fwd_args[n_fwd], 3); set_arg(&net_fwd_args[n_fwd].args[0], DNNL_ARG_SRC, lrn_dst_memory); set_arg(&net_fwd_args[n_fwd].args[1], DNNL_ARG_DST, pool_dst_memory); set_arg(&net_fwd_args[n_fwd].args[2], DNNL_ARG_WORKSPACE, pool_ws_memory); n_fwd++; if (pool_reorder_dst) n_fwd += 1; //----------------------------------------------------------------------- //----------------- Backward Stream ------------------------------------- //----------------------------------------------------------------------- // ... user diff_data ... float *net_diff_dst = (float *)malloc(product(pool_dst_sizes, 4) * sizeof(float)); init_net_data(net_diff_dst, 4, pool_dst_sizes); // create memory for user diff dst data dnnl_memory_t pool_user_diff_dst_memory; init_data_memory(4, pool_dst_sizes, dnnl_nchw, engine, net_diff_dst, &pool_user_diff_dst_memory); // Pooling Backward // pooling diff src memory descriptor const dnnl_memory_desc_t *pool_diff_src_md = lrn_dst_md; // pooling diff dst memory descriptor const dnnl_memory_desc_t *pool_diff_dst_md = pool_dst_md; // create backward pooling descriptor dnnl_pooling_v2_desc_t pool_bwd_desc; CHECK(dnnl_pooling_v2_backward_desc_init(&pool_bwd_desc, dnnl_pooling_max, pool_diff_src_md, pool_diff_dst_md, pool_strides, pool_kernel, pool_dilation, pool_padding, pool_padding)); // backward primitive descriptor needs to hint forward descriptor dnnl_primitive_desc_t pool_bwd_pd; CHECK(dnnl_primitive_desc_create( &pool_bwd_pd, &pool_bwd_desc, NULL, engine, pool_pd)); // create reorder primitive between user diff dst and pool diff dst // if required dnnl_memory_t pool_diff_dst_memory, pool_internal_diff_dst_memory; dnnl_primitive_t pool_reorder_diff_dst; CHECK(prepare_reorder(&pool_user_diff_dst_memory, pool_diff_dst_md, engine, 1, &pool_internal_diff_dst_memory, &pool_reorder_diff_dst, &n_bwd, net_bwd, net_bwd_args)); pool_diff_dst_memory = pool_internal_diff_dst_memory ? pool_internal_diff_dst_memory : pool_user_diff_dst_memory; // create memory for pool diff src data dnnl_memory_t pool_diff_src_memory; CHECK(dnnl_memory_create(&pool_diff_src_memory, pool_diff_src_md, engine, DNNL_MEMORY_ALLOCATE)); // finally create backward pooling primitive dnnl_primitive_t pool_bwd; CHECK(dnnl_primitive_create(&pool_bwd, pool_bwd_pd)); net_bwd[n_bwd] = pool_bwd; prepare_arg_node(&net_bwd_args[n_bwd], 3); set_arg(&net_bwd_args[n_bwd].args[0], DNNL_ARG_DIFF_DST, pool_diff_dst_memory); set_arg(&net_bwd_args[n_bwd].args[1], DNNL_ARG_WORKSPACE, pool_ws_memory); set_arg(&net_bwd_args[n_bwd].args[2], DNNL_ARG_DIFF_SRC, pool_diff_src_memory); n_bwd++; // Backward lrn const dnnl_memory_desc_t *lrn_diff_dst_md = pool_diff_src_md; // create backward lrn descriptor dnnl_lrn_desc_t lrn_bwd_desc; CHECK(dnnl_lrn_backward_desc_init(&lrn_bwd_desc, dnnl_lrn_across_channels, lrn_diff_dst_md, lrn_src_md, local_size, alpha, beta, k)); dnnl_primitive_desc_t lrn_bwd_pd; CHECK(dnnl_primitive_desc_create( &lrn_bwd_pd, &lrn_bwd_desc, NULL, engine, lrn_pd)); // create memory for lrn diff src dnnl_memory_t lrn_diff_src_memory; const dnnl_memory_desc_t *lrn_diff_src_md = dnnl_primitive_desc_query_md( lrn_bwd_pd, dnnl_query_diff_src_md, 0); CHECK(dnnl_memory_create(&lrn_diff_src_memory, lrn_diff_src_md, engine, DNNL_MEMORY_ALLOCATE)); // finally create backward lrn primitive dnnl_primitive_t lrn_bwd; CHECK(dnnl_primitive_create(&lrn_bwd, lrn_bwd_pd)); net_bwd[n_bwd] = lrn_bwd; prepare_arg_node(&net_bwd_args[n_bwd], 4); set_arg(&net_bwd_args[n_bwd].args[0], DNNL_ARG_SRC, relu_dst_memory); set_arg(&net_bwd_args[n_bwd].args[1], DNNL_ARG_DIFF_DST, pool_diff_src_memory); set_arg(&net_bwd_args[n_bwd].args[2], DNNL_ARG_WORKSPACE, lrn_ws_memory); set_arg(&net_bwd_args[n_bwd].args[3], DNNL_ARG_DIFF_SRC, lrn_diff_src_memory); n_bwd++; // Backward relu const dnnl_memory_desc_t *relu_diff_dst_md = lrn_diff_src_md; // create backward relu descriptor dnnl_eltwise_desc_t relu_bwd_desc; CHECK(dnnl_eltwise_backward_desc_init(&relu_bwd_desc, dnnl_eltwise_relu, relu_diff_dst_md, relu_src_md, negative_slope, 0)); dnnl_primitive_desc_t relu_bwd_pd; CHECK(dnnl_primitive_desc_create( &relu_bwd_pd, &relu_bwd_desc, NULL, engine, relu_pd)); // create memory for relu diff src dnnl_memory_t relu_diff_src_memory; const dnnl_memory_desc_t *relu_diff_src_md = dnnl_primitive_desc_query_md( relu_bwd_pd, dnnl_query_diff_src_md, 0); CHECK(dnnl_memory_create(&relu_diff_src_memory, relu_diff_src_md, engine, DNNL_MEMORY_ALLOCATE)); // finally create backward relu primitive dnnl_primitive_t relu_bwd; CHECK(dnnl_primitive_create(&relu_bwd, relu_bwd_pd)); net_bwd[n_bwd] = relu_bwd; prepare_arg_node(&net_bwd_args[n_bwd], 3); set_arg(&net_bwd_args[n_bwd].args[0], DNNL_ARG_SRC, conv_internal_dst_memory); set_arg(&net_bwd_args[n_bwd].args[1], DNNL_ARG_DIFF_DST, lrn_diff_src_memory); set_arg(&net_bwd_args[n_bwd].args[2], DNNL_ARG_DIFF_SRC, relu_diff_src_memory); n_bwd++; // Backward convolution with respect to weights float *conv_diff_bias_buffer = (float *)malloc(product(conv_bias_sizes, 1) * sizeof(float)); float *conv_user_diff_weights_buffer = (float *)malloc( product(conv_user_weights_sizes, 4) * sizeof(float)); // initialize memory for diff weights in user format dnnl_memory_t conv_user_diff_weights_memory; init_data_memory(4, conv_user_weights_sizes, dnnl_oihw, engine, conv_user_diff_weights_buffer, &conv_user_diff_weights_memory); // create backward convolution primitive descriptor dnnl_primitive_desc_t conv_bwd_weights_pd; { // memory descriptors should be in format `any` to allow backward // convolution for // weights to chose the format it prefers for best performance dnnl_memory_desc_t conv_diff_src_md, conv_diff_weights_md, conv_diff_bias_md, conv_diff_dst_md; CHECK(dnnl_memory_desc_init_by_tag(&conv_diff_src_md, 4, conv_user_src_sizes, dnnl_f32, dnnl_format_tag_any)); CHECK(dnnl_memory_desc_init_by_tag(&conv_diff_weights_md, 4, conv_user_weights_sizes, dnnl_f32, dnnl_format_tag_any)); CHECK(dnnl_memory_desc_init_by_tag( &conv_diff_bias_md, 1, conv_bias_sizes, dnnl_f32, dnnl_x)); CHECK(dnnl_memory_desc_init_by_tag(&conv_diff_dst_md, 4, conv_user_dst_sizes, dnnl_f32, dnnl_format_tag_any)); // create backward convolution descriptor dnnl_convolution_desc_t conv_bwd_weights_desc; CHECK(dnnl_convolution_backward_weights_desc_init( &conv_bwd_weights_desc, dnnl_convolution_direct, &conv_diff_src_md, &conv_diff_weights_md, &conv_diff_bias_md, &conv_diff_dst_md, conv_strides, conv_padding, conv_padding)); CHECK(dnnl_primitive_desc_create(&conv_bwd_weights_pd, &conv_bwd_weights_desc, NULL, engine, conv_pd)); } // for best performance convolution backward might chose // different memory format for src and diff_dst // than the memory formats preferred by forward convolution // for src and dst respectively // create reorder primitives for src from forward convolution to the // format chosen by backward convolution dnnl_primitive_t conv_bwd_reorder_src; dnnl_memory_t conv_bwd_internal_src_memory; const dnnl_memory_desc_t *conv_diff_src_md = dnnl_primitive_desc_query_md( conv_bwd_weights_pd, dnnl_query_src_md, 0); CHECK(prepare_reorder(&conv_src_memory, conv_diff_src_md, engine, 1, &conv_bwd_internal_src_memory, &conv_bwd_reorder_src, &n_bwd, net_bwd, net_bwd_args)); dnnl_memory_t conv_bwd_weights_src_memory = conv_bwd_internal_src_memory ? conv_bwd_internal_src_memory : conv_src_memory; // create reorder primitives for diff_dst between diff_src from relu_bwd // and format preferred by conv_diff_weights dnnl_primitive_t conv_reorder_diff_dst; dnnl_memory_t conv_internal_diff_dst_memory; const dnnl_memory_desc_t *conv_diff_dst_md = dnnl_primitive_desc_query_md( conv_bwd_weights_pd, dnnl_query_diff_dst_md, 0); CHECK(prepare_reorder(&relu_diff_src_memory, conv_diff_dst_md, engine, 1, &conv_internal_diff_dst_memory, &conv_reorder_diff_dst, &n_bwd, net_bwd, net_bwd_args)); dnnl_memory_t conv_diff_dst_memory = conv_internal_diff_dst_memory ? conv_internal_diff_dst_memory : relu_diff_src_memory; // create reorder primitives for conv diff weights memory dnnl_primitive_t conv_reorder_diff_weights; dnnl_memory_t conv_internal_diff_weights_memory; const dnnl_memory_desc_t *conv_diff_weights_md = dnnl_primitive_desc_query_md( conv_bwd_weights_pd, dnnl_query_diff_weights_md, 0); n_bwd += 1; // tentative workaround: preserve space for conv_bwd_weights // that should happen before the reorder CHECK(prepare_reorder(&conv_user_diff_weights_memory, conv_diff_weights_md, engine, 0, &conv_internal_diff_weights_memory, &conv_reorder_diff_weights, &n_bwd, net_bwd, net_bwd_args)); n_bwd -= conv_reorder_diff_weights ? 2 : 1; dnnl_memory_t conv_diff_weights_memory = conv_internal_diff_weights_memory ? conv_internal_diff_weights_memory : conv_user_diff_weights_memory; // create memory for diff bias memory dnnl_memory_t conv_diff_bias_memory; const dnnl_memory_desc_t *conv_diff_bias_md = dnnl_primitive_desc_query_md( conv_bwd_weights_pd, dnnl_query_diff_weights_md, 1); CHECK(dnnl_memory_create(&conv_diff_bias_memory, conv_diff_bias_md, engine, DNNL_MEMORY_ALLOCATE)); CHECK(dnnl_memory_set_data_handle( conv_diff_bias_memory, conv_diff_bias_buffer)); // finally created backward convolution weights primitive dnnl_primitive_t conv_bwd_weights; CHECK(dnnl_primitive_create(&conv_bwd_weights, conv_bwd_weights_pd)); net_bwd[n_bwd] = conv_bwd_weights; prepare_arg_node(&net_bwd_args[n_bwd], 4); set_arg(&net_bwd_args[n_bwd].args[0], DNNL_ARG_SRC, conv_bwd_weights_src_memory); set_arg(&net_bwd_args[n_bwd].args[1], DNNL_ARG_DIFF_DST, conv_diff_dst_memory); set_arg(&net_bwd_args[n_bwd].args[2], DNNL_ARG_DIFF_WEIGHTS, conv_diff_weights_memory); set_arg(&net_bwd_args[n_bwd].args[3], DNNL_ARG_DIFF_BIAS, conv_diff_bias_memory); n_bwd++; if (conv_reorder_diff_weights) n_bwd += 1; // output from backward stream void *net_diff_weights = NULL; void *net_diff_bias = NULL; int n_iter = 10; // number of iterations for training. dnnl_stream_t stream; CHECK(dnnl_stream_create(&stream, engine, dnnl_stream_default_flags)); // Execute the net for (int i = 0; i < n_iter; i++) { for (uint32_t i = 0; i < n_fwd; ++i) CHECK(dnnl_primitive_execute(net_fwd[i], stream, net_fwd_args[i].nargs, net_fwd_args[i].args)); // Update net_diff_dst void *net_output = NULL; // output from forward stream: CHECK(dnnl_memory_get_data_handle(pool_user_dst_memory, &net_output)); // ...user updates net_diff_dst using net_output... // some user defined func update_diff_dst(net_diff_dst, net_output) // Backward pass for (uint32_t i = 0; i < n_bwd; ++i) CHECK(dnnl_primitive_execute(net_bwd[i], stream, net_bwd_args[i].nargs, net_bwd_args[i].args)); // ... update weights ... CHECK(dnnl_memory_get_data_handle( conv_user_diff_weights_memory, &net_diff_weights)); CHECK(dnnl_memory_get_data_handle( conv_diff_bias_memory, &net_diff_bias)); // ...user updates weights and bias using diff weights and bias... // some user defined func update_weights(conv_user_weights_memory, // conv_bias_memory, // net_diff_weights, net_diff_bias); } CHECK(dnnl_stream_wait(stream)); dnnl_stream_destroy(stream); // clean up nets for (uint32_t i = 0; i < n_fwd; ++i) free_arg_node(&net_fwd_args[i]); for (uint32_t i = 0; i < n_bwd; ++i) free_arg_node(&net_bwd_args[i]); // Cleanup forward CHECK(dnnl_primitive_desc_destroy(pool_pd)); CHECK(dnnl_primitive_desc_destroy(lrn_pd)); CHECK(dnnl_primitive_desc_destroy(relu_pd)); CHECK(dnnl_primitive_desc_destroy(conv_pd)); free(net_src); free(net_dst); dnnl_memory_destroy(conv_user_src_memory); dnnl_memory_destroy(conv_user_weights_memory); dnnl_memory_destroy(conv_user_bias_memory); dnnl_memory_destroy(conv_internal_src_memory); dnnl_memory_destroy(conv_internal_weights_memory); dnnl_memory_destroy(conv_internal_dst_memory); dnnl_primitive_destroy(conv_reorder_src); dnnl_primitive_destroy(conv_reorder_weights); dnnl_primitive_destroy(conv); free(conv_weights); free(conv_bias); dnnl_memory_destroy(relu_dst_memory); dnnl_primitive_destroy(relu); dnnl_memory_destroy(lrn_ws_memory); dnnl_memory_destroy(lrn_dst_memory); dnnl_primitive_destroy(lrn); dnnl_memory_destroy(pool_user_dst_memory); dnnl_memory_destroy(pool_internal_dst_memory); dnnl_memory_destroy(pool_ws_memory); dnnl_primitive_destroy(pool_reorder_dst); dnnl_primitive_destroy(pool); // Cleanup backward CHECK(dnnl_primitive_desc_destroy(pool_bwd_pd)); CHECK(dnnl_primitive_desc_destroy(lrn_bwd_pd)); CHECK(dnnl_primitive_desc_destroy(relu_bwd_pd)); CHECK(dnnl_primitive_desc_destroy(conv_bwd_weights_pd)); dnnl_memory_destroy(pool_user_diff_dst_memory); dnnl_memory_destroy(pool_diff_src_memory); dnnl_memory_destroy(pool_internal_diff_dst_memory); dnnl_primitive_destroy(pool_reorder_diff_dst); dnnl_primitive_destroy(pool_bwd); free(net_diff_dst); dnnl_memory_destroy(lrn_diff_src_memory); dnnl_primitive_destroy(lrn_bwd); dnnl_memory_destroy(relu_diff_src_memory); dnnl_primitive_destroy(relu_bwd); dnnl_memory_destroy(conv_user_diff_weights_memory); dnnl_memory_destroy(conv_diff_bias_memory); dnnl_memory_destroy(conv_bwd_internal_src_memory); dnnl_primitive_destroy(conv_bwd_reorder_src); dnnl_memory_destroy(conv_internal_diff_dst_memory); dnnl_primitive_destroy(conv_reorder_diff_dst); dnnl_memory_destroy(conv_internal_diff_weights_memory); dnnl_primitive_destroy(conv_reorder_diff_weights); dnnl_primitive_destroy(conv_bwd_weights); free(conv_diff_bias_buffer); free(conv_user_diff_weights_buffer); dnnl_engine_destroy(engine); } int main(int argc, char **argv) { simple_net(); printf("Example passed on CPU.\n"); return 0; }

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