Implement reference nGraph implementation for operations "Experimenta…

…lDetectronDetectionOutput", "ExperimentalDetectronPriorGridGenerator" (#4004)

Implemented reference nGraph implementation for operations "ExperimentalDetectronDetectionOutput" and "ExperimentalDetectronPriorGridGenerator" #43928

ngraph/core/reference/include/ngraph/runtime/reference/experimental_detectron_detection_output.hpp

@@ -0,0 +1,58 @@
+//*****************************************************************************
+// Copyright 2017-2021 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.
+//*****************************************************************************
+
+#pragma once
+
+#include <cmath>
+#include <cstddef>
+#include <cstdint>
+#include <ngraph/runtime/host_tensor.hpp>
+#include <vector>
+#include "ngraph/node.hpp"
+#include "ngraph/op/util/op_types.hpp"
+#include "ngraph/ops.hpp"
+#include "ngraph/shape_util.hpp"
+
+namespace ngraph
+{
+    namespace runtime
+    {
+        namespace reference
+        {
+            void experimental_detectron_detection_output(
+                const float* input_rois,
+                const float* input_deltas,
+                const float* input_scores,
+                const float* input_im_info,
+                const op::v6::ExperimentalDetectronDetectionOutput::Attributes& attrs,
+                float* output_boxes,
+                float* output_scores,
+                int32_t* output_classes);
+
+            void experimental_detectron_detection_output_postprocessing(
+                void* pboxes,
+                void* pclasses,
+                void* pscores,
+                const ngraph::element::Type output_type,
+                const std::vector<float>& output_boxes,
+                const std::vector<int32_t>& output_classes,
+                const std::vector<float>& output_scores,
+                const Shape& output_boxes_shape,
+                const Shape& output_classes_shape,
+                const Shape& output_scores_shape);
+        } // namespace reference
+    }     // namespace runtime
+} // namespace ngraph

ngraph/core/reference/include/ngraph/runtime/reference/experimental_detectron_prior_grid_generator.hpp

@@ -0,0 +1,70 @@
+//*****************************************************************************
+// Copyright 2017-2021 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.
+//*****************************************************************************
+
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+#include <ngraph/runtime/host_tensor.hpp>
+#include <vector>
+#include "ngraph/node.hpp"
+#include "ngraph/op/util/op_types.hpp"
+#include "ngraph/ops.hpp"
+#include "ngraph/shape_util.hpp"
+
+namespace ngraph
+{
+    namespace runtime
+    {
+        namespace reference
+        {
+            template <typename T>
+            void experimental_detectron_prior_grid_generator(const T* priors,
+                                                             const Shape& priors_shape,
+                                                             const Shape& feature_map_shape,
+                                                             const Shape& im_data_shape,
+                                                             T* output_rois,
+                                                             int64_t grid_h,
+                                                             int64_t grid_w,
+                                                             float stride_h,
+                                                             float stride_w)
+            {
+                const int64_t num_priors = static_cast<int64_t>(priors_shape[0]);
+                const int64_t layer_width = grid_w ? grid_w : feature_map_shape[3];
+                const int64_t layer_height = grid_h ? grid_h : feature_map_shape[2];
+                const float step_w =
+                    stride_w ? stride_w : static_cast<float>(im_data_shape[3]) / layer_width;
+                const float step_h =
+                    stride_h ? stride_h : static_cast<float>(im_data_shape[2]) / layer_height;
+
+                for (int64_t h = 0; h < layer_height; ++h)
+                {
+                    for (int64_t w = 0; w < layer_width; ++w)
+                    {
+                        for (int64_t s = 0; s < num_priors; ++s)
+                        {
+                            output_rois[0] = priors[4 * s + 0] + step_w * (w + 0.5f);
+                            output_rois[1] = priors[4 * s + 1] + step_h * (h + 0.5f);
+                            output_rois[2] = priors[4 * s + 2] + step_w * (w + 0.5f);
+                            output_rois[3] = priors[4 * s + 3] + step_h * (h + 0.5f);
+                            output_rois += 4;
+                        }
+                    }
+                }
+            }
+        } // namespace reference
+    }     // namespace runtime
+} // namespace ngraph