Refine and fix some code for faster-rcnn. (#13135)

* Fix bug in generate_proposals_op.
* Fix data type for RoIs.
* Refine and fix rpn_target_assign_op.
* Add the missing file bbox_util.h
* Rename BoxEncoder to BoxToDelta

paddle/fluid/operators/detection/bbox_util.h

+/* Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
+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 "paddle/fluid/framework/eigen.h"
+#include "paddle/fluid/framework/tensor.h"
+
+namespace paddle {
+namespace operators {
+
+/*
+ * transform that computes target bounding-box regression deltas
+ * given proposal boxes and ground-truth boxes.
+ */
+template <typename T>
+inline void BoxToDelta(const int box_num, const framework::Tensor& ex_boxes,
+                       const framework::Tensor& gt_boxes, const T* weights,
+                       const bool normalized, framework::Tensor* box_delta) {
+  auto ex_boxes_et = framework::EigenTensor<T, 2>::From(ex_boxes);
+  auto gt_boxes_et = framework::EigenTensor<T, 2>::From(gt_boxes);
+  auto trg = framework::EigenTensor<T, 2>::From(*box_delta);
+  T ex_w, ex_h, ex_ctr_x, ex_ctr_y, gt_w, gt_h, gt_ctr_x, gt_ctr_y;
+  for (int64_t i = 0; i < box_num; ++i) {
+    ex_w = ex_boxes_et(i, 2) - ex_boxes_et(i, 0) + (normalized == false);
+    ex_h = ex_boxes_et(i, 3) - ex_boxes_et(i, 1) + (normalized == false);
+    ex_ctr_x = ex_boxes_et(i, 0) + 0.5 * ex_w;
+    ex_ctr_y = ex_boxes_et(i, 1) + 0.5 * ex_h;
+
+    gt_w = gt_boxes_et(i, 2) - gt_boxes_et(i, 0) + (normalized == false);
+    gt_h = gt_boxes_et(i, 3) - gt_boxes_et(i, 1) + (normalized == false);
+    gt_ctr_x = gt_boxes_et(i, 0) + 0.5 * gt_w;
+    gt_ctr_y = gt_boxes_et(i, 1) + 0.5 * gt_h;
+
+    trg(i, 0) = (gt_ctr_x - ex_ctr_x) / ex_w;
+    trg(i, 1) = (gt_ctr_y - ex_ctr_y) / ex_h;
+    trg(i, 2) = std::log(gt_w / ex_w);
+    trg(i, 3) = std::log(gt_h / ex_h);
+
+    if (weights) {
+      trg(i, 0) = trg(i, 0) / weights[0];
+      trg(i, 1) = trg(i, 1) / weights[1];
+      trg(i, 2) = trg(i, 2) / weights[2];
+      trg(i, 3) = trg(i, 3) / weights[3];
+    }
+  }
+}
+
+template <typename T>
+void Gather(const T* in, const int in_stride, const int* index, const int num,
+            T* out) {
+  const int stride_bytes = in_stride * sizeof(T);
+  for (int i = 0; i < num; ++i) {
+    int id = index[i];
+    memcpy(out + i * in_stride, in + id * in_stride, stride_bytes);
+  }
+}
+
+}  // namespace operators
+}  // namespace paddle

paddle/fluid/operators/detection/generate_proposal_labels_op.cc

@@ -14,6 +14,7 @@ limitations under the License. */
 #include <string>
 #include <vector>
 #include "paddle/fluid/framework/op_registry.h"
+#include "paddle/fluid/operators/detection/bbox_util.h"
 #include "paddle/fluid/operators/gather.h"
 #include "paddle/fluid/operators/math/concat.h"
 #include "paddle/fluid/operators/math/math_function.h"
@@ -133,31 +134,6 @@ void BboxOverlaps(const Tensor& r_boxes, const Tensor& c_boxes,
   }
 }
 
-template <typename T>
-void BoxToDelta(int box_num, const Tensor& ex_boxes, const Tensor& gt_boxes,
-                const std::vector<float>& weights, Tensor* box_delta) {
-  auto ex_boxes_et = framework::EigenTensor<T, 2>::From(ex_boxes);
-  auto gt_boxes_et = framework::EigenTensor<T, 2>::From(gt_boxes);
-  auto box_delta_et = framework::EigenTensor<T, 2>::From(*box_delta);
-  T ex_w, ex_h, ex_ctr_x, ex_ctr_y, gt_w, gt_h, gt_ctr_x, gt_ctr_y;
-  for (int64_t i = 0; i < box_num; ++i) {
-    ex_w = ex_boxes_et(i, 2) - ex_boxes_et(i, 0) + 1;
-    ex_h = ex_boxes_et(i, 3) - ex_boxes_et(i, 1) + 1;
-    ex_ctr_x = ex_boxes_et(i, 0) + 0.5 * ex_w;
-    ex_ctr_y = ex_boxes_et(i, 1) + 0.5 * ex_h;
-
-    gt_w = gt_boxes_et(i, 2) - gt_boxes_et(i, 0) + 1;
-    gt_h = gt_boxes_et(i, 3) - gt_boxes_et(i, 1) + 1;
-    gt_ctr_x = gt_boxes_et(i, 0) + 0.5 * gt_w;
-    gt_ctr_y = gt_boxes_et(i, 1) + 0.5 * gt_h;
-
-    box_delta_et(i, 0) = (gt_ctr_x - ex_ctr_x) / ex_w / weights[0];
-    box_delta_et(i, 1) = (gt_ctr_y - ex_ctr_y) / ex_h / weights[1];
-    box_delta_et(i, 2) = log(gt_w / ex_w) / ex_w / weights[2];
-    box_delta_et(i, 3) = log(gt_h / ex_h) / ex_h / weights[3];
-  }
-}
-
 template <typename T>
 std::vector<std::vector<int>> SampleFgBgGt(
     const platform::CPUDeviceContext& context, Tensor* iou,
@@ -243,12 +219,11 @@ void GatherBoxesLabels(const platform::CPUDeviceContext& context,
                        Tensor* sampled_labels, Tensor* sampled_gts) {
   int fg_num = fg_inds.size();
   int bg_num = bg_inds.size();
-  int gt_num = fg_num + bg_num;
   Tensor fg_inds_t, bg_inds_t, gt_box_inds_t, gt_label_inds_t;
   int* fg_inds_data = fg_inds_t.mutable_data<int>({fg_num}, context.GetPlace());
   int* bg_inds_data = bg_inds_t.mutable_data<int>({bg_num}, context.GetPlace());
   int* gt_box_inds_data =
-      gt_box_inds_t.mutable_data<int>({gt_num}, context.GetPlace());
+      gt_box_inds_t.mutable_data<int>({fg_num}, context.GetPlace());
   int* gt_label_inds_data =
       gt_label_inds_t.mutable_data<int>({fg_num}, context.GetPlace());
   std::copy(fg_inds.begin(), fg_inds.end(), fg_inds_data);
@@ -303,18 +278,20 @@ std::vector<Tensor> SampleRoisForOneImage(
 
   // Gather boxes and labels
   Tensor sampled_boxes, sampled_labels, sampled_gts;
-  int boxes_num = fg_inds.size() + bg_inds.size();
+  int fg_num = fg_inds.size();
+  int bg_num = bg_inds.size();
+  int boxes_num = fg_num + bg_num;
   framework::DDim bbox_dim({boxes_num, kBoxDim});
   sampled_boxes.mutable_data<T>(bbox_dim, context.GetPlace());
   sampled_labels.mutable_data<int>({boxes_num}, context.GetPlace());
-  sampled_gts.mutable_data<T>(bbox_dim, context.GetPlace());
+  sampled_gts.mutable_data<T>({fg_num, kBoxDim}, context.GetPlace());
   GatherBoxesLabels<T>(context, boxes, *gt_boxes, *gt_classes, fg_inds, bg_inds,
                        gt_inds, &sampled_boxes, &sampled_labels, &sampled_gts);
 
   // Compute targets
   Tensor bbox_targets_single;
   bbox_targets_single.mutable_data<T>(bbox_dim, context.GetPlace());
-  BoxToDelta<T>(boxes_num, sampled_boxes, sampled_gts, bbox_reg_weights,
+  BoxToDelta<T>(fg_num, sampled_boxes, sampled_gts, nullptr, false,
                 &bbox_targets_single);
 
   // Scale rois
@@ -427,7 +404,7 @@ class GenerateProposalLabelsKernel : public framework::OpKernel<T> {
     auto rpn_rois_lod = rpn_rois->lod().back();
     auto gt_classes_lod = gt_classes->lod().back();
     auto gt_boxes_lod = gt_boxes->lod().back();
-    for (size_t i = 0; i < n; ++i) {
+    for (int i = 0; i < n; ++i) {
       Tensor rpn_rois_slice =
           rpn_rois->Slice(rpn_rois_lod[i], rpn_rois_lod[i + 1]);
       Tensor gt_classes_slice =

paddle/fluid/operators/detection/generate_proposals_op.cc

@@ -311,8 +311,7 @@ class GenerateProposalsKernel : public framework::OpKernel<T> {
 
     rpn_rois->mutable_data<T>({bbox_deltas->numel() / 4, 4},
                               context.GetPlace());
-    rpn_roi_probs->mutable_data<T>({scores->numel() / 4, 1},
-                                   context.GetPlace());
+    rpn_roi_probs->mutable_data<T>({scores->numel(), 1}, context.GetPlace());
 
     Tensor bbox_deltas_swap, scores_swap;
     bbox_deltas_swap.mutable_data<T>({num, h_bbox, w_bbox, c_bbox},
@@ -421,7 +420,7 @@ class GenerateProposalsKernel : public framework::OpKernel<T> {
     CPUGather<T>(ctx, proposals, keep, &bbox_sel);
     CPUGather<T>(ctx, scores_sel, keep, &scores_filter);
     if (nms_thresh <= 0) {
-      return std::make_pair(bbox_sel, scores_sel);
+      return std::make_pair(bbox_sel, scores_filter);
     }
 
     Tensor keep_nms = NMS<T>(ctx, &bbox_sel, &scores_filter, nms_thresh, eta);

paddle/fluid/operators/detection/rpn_target_assign_op.cc

@@ -14,6 +14,7 @@ limitations under the License. */
 
 #include <random>
 #include "paddle/fluid/framework/op_registry.h"
+#include "paddle/fluid/operators/detection/bbox_util.h"
 #include "paddle/fluid/operators/math/math_function.h"
 
 namespace paddle {
@@ -46,156 +47,219 @@ class RpnTargetAssignOp : public framework::OperatorWithKernel {
     auto in_dims = ctx->GetInputDim("DistMat");
     PADDLE_ENFORCE_EQ(in_dims.size(), 2,
                       "The rank of Input(DistMat) must be 2.");
+
+    ctx->SetOutputDim("LocationIndex", {-1});
+    ctx->SetOutputDim("ScoreIndex", {-1});
+    ctx->SetOutputDim("TargetLabel", {-1, 1});
+    ctx->SetOutputDim("TargetBBox", {-1, 4});
+  }
+
+ protected:
+  framework::OpKernelType GetExpectedKernelType(
+      const framework::ExecutionContext& ctx) const override {
+    return framework::OpKernelType(
+        framework::ToDataType(
+            ctx.Input<framework::LoDTensor>("DistMat")->type()),
+        platform::CPUPlace());
   }
 };
 
 template <typename T>
 class RpnTargetAssignKernel : public framework::OpKernel<T> {
  public:
+  void Compute(const framework::ExecutionContext& context) const override {
+    auto* anchor_t = context.Input<Tensor>("Anchor");  // (H*W*A) * 4
+    auto* gt_bbox_t = context.Input<Tensor>("GtBox");
+    auto* dist_t = context.Input<LoDTensor>("DistMat");
+
+    auto* loc_index_t = context.Output<Tensor>("LocationIndex");
+    auto* score_index_t = context.Output<Tensor>("ScoreIndex");
+    auto* tgt_bbox_t = context.Output<Tensor>("TargetBBox");
+    auto* tgt_lbl_t = context.Output<Tensor>("TargetLabel");
+
+    auto lod = dist_t->lod().back();
+    int64_t batch_num = static_cast<int64_t>(lod.size() - 1);
+    int64_t anchor_num = dist_t->dims()[1];
+    PADDLE_ENFORCE_EQ(anchor_num, anchor_t->dims()[0]);
+
+    int rpn_batch_size = context.Attr<int>("rpn_batch_size_per_im");
+    float pos_threshold = context.Attr<float>("rpn_positive_overlap");
+    float neg_threshold = context.Attr<float>("rpn_negative_overlap");
+    float fg_fraction = context.Attr<float>("fg_fraction");
+
+    int fg_num_per_batch = static_cast<int>(rpn_batch_size * fg_fraction);
+
+    int64_t max_num = batch_num * anchor_num;
+    auto place = context.GetPlace();
+
+    tgt_bbox_t->mutable_data<T>({max_num, 4}, place);
+    auto* loc_index = loc_index_t->mutable_data<int>({max_num}, place);
+    auto* score_index = score_index_t->mutable_data<int>({max_num}, place);
+
+    Tensor tmp_tgt_lbl;
+    auto* tmp_lbl_data = tmp_tgt_lbl.mutable_data<int64_t>({max_num}, place);
+    auto& dev_ctx = context.device_context<platform::CPUDeviceContext>();
+    math::SetConstant<platform::CPUDeviceContext, int64_t> iset;
+    iset(dev_ctx, &tmp_tgt_lbl, static_cast<int64_t>(-1));
+
+    std::random_device rnd;
+    std::minstd_rand engine;
+    int seed =
+        context.Attr<bool>("fix_seed") ? context.Attr<int>("seed") : rnd();
+    engine.seed(seed);
+
+    int fg_num = 0;
+    int bg_num = 0;
+    for (int i = 0; i < batch_num; ++i) {
+      Tensor dist = dist_t->Slice(lod[i], lod[i + 1]);
+      Tensor gt_bbox = gt_bbox_t->Slice(lod[i], lod[i + 1]);
+      auto fg_bg_gt = SampleFgBgGt(dev_ctx, dist, pos_threshold, neg_threshold,
+                                   rpn_batch_size, fg_num_per_batch, engine,
+                                   tmp_lbl_data + i * anchor_num);
+
+      int cur_fg_num = fg_bg_gt[0].size();
+      int cur_bg_num = fg_bg_gt[1].size();
+      std::transform(fg_bg_gt[0].begin(), fg_bg_gt[0].end(), loc_index,
+                     [i, anchor_num](int d) { return d + i * anchor_num; });
+      memcpy(score_index, loc_index, cur_fg_num * sizeof(int));
+      std::transform(fg_bg_gt[1].begin(), fg_bg_gt[1].end(),
+                     score_index + cur_fg_num,
+                     [i, anchor_num](int d) { return d + i * anchor_num; });
+
+      // get target bbox deltas
+      if (cur_fg_num) {
+        Tensor fg_gt;
+        T* gt_data = fg_gt.mutable_data<T>({cur_fg_num, 4}, place);
+        Tensor tgt_bbox = tgt_bbox_t->Slice(fg_num, fg_num + cur_fg_num);
+        T* tgt_data = tgt_bbox.data<T>();
+        Gather<T>(anchor_t->data<T>(), 4,
+                  reinterpret_cast<int*>(&fg_bg_gt[0][0]), cur_fg_num,
+                  tgt_data);
+        Gather<T>(gt_bbox.data<T>(), 4, reinterpret_cast<int*>(&fg_bg_gt[2][0]),
+                  cur_fg_num, gt_data);
+        BoxToDelta<T>(cur_fg_num, tgt_bbox, fg_gt, nullptr, false, &tgt_bbox);
+      }
+
+      loc_index += cur_fg_num;
+      score_index += cur_fg_num + cur_bg_num;
+      fg_num += cur_fg_num;
+      bg_num += cur_bg_num;
+    }
+
+    int lbl_num = fg_num + bg_num;
+    PADDLE_ENFORCE_LE(fg_num, max_num);
+    PADDLE_ENFORCE_LE(lbl_num, max_num);
+
+    tgt_bbox_t->Resize({fg_num, 4});
+    loc_index_t->Resize({fg_num});
+    score_index_t->Resize({lbl_num});
+    auto* lbl_data = tgt_lbl_t->mutable_data<int64_t>({lbl_num, 1}, place);
+    Gather<int64_t>(tmp_lbl_data, 1, score_index_t->data<int>(), lbl_num,
+                    lbl_data);
+  }
+
+ private:
   void ScoreAssign(const T* dist_data, const Tensor& anchor_to_gt_max,
                    const int row, const int col, const float pos_threshold,
-                   const float neg_threshold, int64_t* target_label_data,
+                   const float neg_threshold, int64_t* target_label,
                    std::vector<int>* fg_inds, std::vector<int>* bg_inds) const {
-    int fg_offset = fg_inds->size();
-    int bg_offset = bg_inds->size();
+    float epsilon = 0.0001;
     for (int64_t i = 0; i < row; ++i) {
       const T* v = dist_data + i * col;
-      T max_dist = *std::max_element(v, v + col);
+      T max = *std::max_element(v, v + col);
       for (int64_t j = 0; j < col; ++j) {
-        T val = dist_data[i * col + j];
-        if (val == max_dist) target_label_data[j] = 1;
+        if (std::abs(max - v[j]) < epsilon) {
+          target_label[j] = 1;
+        }
       }
     }
 
-    // Pick the fg/bg and count the number
+    // Pick the fg/bg
+    const T* anchor_to_gt_max_data = anchor_to_gt_max.data<T>();
     for (int64_t j = 0; j < col; ++j) {
-      if (anchor_to_gt_max.data<T>()[j] > pos_threshold) {
-        target_label_data[j] = 1;
-      } else if (anchor_to_gt_max.data<T>()[j] < neg_threshold) {
-        target_label_data[j] = 0;
+      if (anchor_to_gt_max_data[j] >= pos_threshold) {
+        target_label[j] = 1;
+      } else if (anchor_to_gt_max_data[j] < neg_threshold) {
+        target_label[j] = 0;
       }
-      if (target_label_data[j] == 1) {
-        fg_inds->push_back(fg_offset + j);
-      } else if (target_label_data[j] == 0) {
-        bg_inds->push_back(bg_offset + j);
+      if (target_label[j] == 1) {
+        fg_inds->push_back(j);
+      } else if (target_label[j] == 0) {
+        bg_inds->push_back(j);
       }
     }
   }
 
-  void ReservoirSampling(const int num, const int offset,
-                         std::minstd_rand engine,
+  void ReservoirSampling(const int num, std::minstd_rand engine,
                          std::vector<int>* inds) const {
     std::uniform_real_distribution<float> uniform(0, 1);
-    const int64_t size = static_cast<int64_t>(inds->size() - offset);
-    if (size > num) {
-      for (int64_t i = num; i < size; ++i) {
+    size_t len = inds->size();
+    if (len > static_cast<size_t>(num)) {
+      for (size_t i = num; i < len; ++i) {
         int rng_ind = std::floor(uniform(engine) * i);
         if (rng_ind < num)
-          std::iter_swap(inds->begin() + rng_ind + offset,
-                         inds->begin() + i + offset);
+          std::iter_swap(inds->begin() + rng_ind, inds->begin() + i);
       }
+      inds->resize(num);
     }
   }
 
-  void RpnTargetAssign(const framework::ExecutionContext& ctx,
-                       const Tensor& dist, const float pos_threshold,
-                       const float neg_threshold, const int rpn_batch_size,
-                       const int fg_num, std::minstd_rand engine,
-                       std::vector<int>* fg_inds, std::vector<int>* bg_inds,
-                       int64_t* target_label_data) const {
+  // std::vector<std::vector<int>> RpnTargetAssign(
+  std::vector<std::vector<int>> SampleFgBgGt(
+      const platform::CPUDeviceContext& ctx, const Tensor& dist,
+      const float pos_threshold, const float neg_threshold,
+      const int rpn_batch_size, const int fg_num, std::minstd_rand engine,
+      int64_t* target_label) const {
     auto* dist_data = dist.data<T>();
-    int64_t row = dist.dims()[0];
-    int64_t col = dist.dims()[1];
-    int fg_offset = fg_inds->size();
-    int bg_offset = bg_inds->size();
+    int row = dist.dims()[0];
+    int col = dist.dims()[1];
+
+    std::vector<int> fg_inds;
+    std::vector<int> bg_inds;
+    std::vector<int> gt_inds;
 
     // Calculate the max IoU between anchors and gt boxes
-    Tensor anchor_to_gt_max;
-    anchor_to_gt_max.mutable_data<T>(
-        framework::make_ddim({static_cast<int64_t>(col), 1}),
-        platform::CPUPlace());
-    auto& place = *ctx.template device_context<platform::CPUDeviceContext>()
-                       .eigen_device();
-    auto x = EigenMatrix<T>::From(dist);
-    auto x_col_max = EigenMatrix<T>::From(anchor_to_gt_max);
-    x_col_max.device(place) =
-        x.maximum(Eigen::DSizes<int, 1>(0))
-            .reshape(Eigen::DSizes<int, 2>(static_cast<int64_t>(col), 1));
+    // Map from anchor to gt box that has highest overlap
+    auto place = ctx.GetPlace();
+    Tensor anchor_to_gt_max, anchor_to_gt_argmax;
+    anchor_to_gt_max.mutable_data<T>({col}, place);
+    int* argmax = anchor_to_gt_argmax.mutable_data<int>({col}, place);
+
+    auto x = framework::EigenMatrix<T>::From(dist);
+    auto x_col_max = framework::EigenVector<T>::Flatten(anchor_to_gt_max);
+    auto x_col_argmax =
+        framework::EigenVector<int>::Flatten(anchor_to_gt_argmax);
+    x_col_max = x.maximum(Eigen::DSizes<int, 1>(0));
+    x_col_argmax = x.argmax(0).template cast<int>();
+
     // Follow the Faster RCNN's implementation
     ScoreAssign(dist_data, anchor_to_gt_max, row, col, pos_threshold,
-                neg_threshold, target_label_data, fg_inds, bg_inds);
+                neg_threshold, target_label, &fg_inds, &bg_inds);
     // Reservoir Sampling
-    ReservoirSampling(fg_num, fg_offset, engine, fg_inds);
-    int bg_num = rpn_batch_size - (fg_inds->size() - fg_offset);
-    ReservoirSampling(bg_num, bg_offset, engine, bg_inds);
-  }
+    ReservoirSampling(fg_num, engine, &fg_inds);
+    int fg_num2 = static_cast<int>(fg_inds.size());
+    int bg_num = rpn_batch_size - fg_num2;
+    ReservoirSampling(bg_num, engine, &bg_inds);
 
-  void Compute(const framework::ExecutionContext& context) const override {
-    auto* dist = context.Input<LoDTensor>("DistMat");
-    auto* loc_index = context.Output<Tensor>("LocationIndex");
-    auto* score_index = context.Output<Tensor>("ScoreIndex");
-    auto* tgt_lbl = context.Output<Tensor>("TargetLabel");
-
-    auto col = dist->dims()[1];
-    int64_t n = dist->lod().size() == 0UL
-                    ? 1
-                    : static_cast<int64_t>(dist->lod().back().size() - 1);
-    if (dist->lod().size()) {
-      PADDLE_ENFORCE_EQ(dist->lod().size(), 1UL,
-                        "Only support 1 level of LoD.");
+    gt_inds.reserve(fg_num2);
+    for (int i = 0; i < fg_num2; ++i) {
+      gt_inds.emplace_back(argmax[fg_inds[i]]);
     }
-    int rpn_batch_size = context.Attr<int>("rpn_batch_size_per_im");
-    float pos_threshold = context.Attr<float>("rpn_positive_overlap");
-    float neg_threshold = context.Attr<float>("rpn_negative_overlap");
-    float fg_fraction = context.Attr<float>("fg_fraction");
-
-    int fg_num = static_cast<int>(rpn_batch_size * fg_fraction);
-
-    int64_t* target_label_data =
-        tgt_lbl->mutable_data<int64_t>({n * col, 1}, context.GetPlace());
+    std::vector<std::vector<int>> fg_bg_gt;
+    fg_bg_gt.emplace_back(fg_inds);
+    fg_bg_gt.emplace_back(bg_inds);
+    fg_bg_gt.emplace_back(gt_inds);
 
-    auto& dev_ctx = context.device_context<platform::CPUDeviceContext>();
-    math::SetConstant<platform::CPUDeviceContext, int64_t> iset;
-    iset(dev_ctx, tgt_lbl, static_cast<int>(-1));
-
-    std::vector<int> fg_inds;
-    std::vector<int> bg_inds;
-    std::random_device rnd;
-    std::minstd_rand engine;
-    int seed =
-        context.Attr<bool>("fix_seed") ? context.Attr<int>("seed") : rnd();
-    engine.seed(seed);
-
-    if (n == 1) {
-      RpnTargetAssign(context, *dist, pos_threshold, neg_threshold,
-                      rpn_batch_size, fg_num, engine, &fg_inds, &bg_inds,
-                      target_label_data);
-    } else {
-      auto lod = dist->lod().back();
-      for (size_t i = 0; i < lod.size() - 1; ++i) {
-        Tensor one_ins = dist->Slice(lod[i], lod[i + 1]);
-        RpnTargetAssign(context, one_ins, pos_threshold, neg_threshold,
-                        rpn_batch_size, fg_num, engine, &fg_inds, &bg_inds,
-                        target_label_data + i * col);
-      }
-    }
-    int* loc_index_data = loc_index->mutable_data<int>(
-        {static_cast<int>(fg_inds.size())}, context.GetPlace());
-    int* score_index_data = score_index->mutable_data<int>(
-        {static_cast<int>(fg_inds.size() + bg_inds.size())},
-        context.GetPlace());
-    memcpy(loc_index_data, reinterpret_cast<int*>(&fg_inds[0]),
-           fg_inds.size() * sizeof(int));
-    memcpy(score_index_data, reinterpret_cast<int*>(&fg_inds[0]),
-           fg_inds.size() * sizeof(int));
-    memcpy(score_index_data + fg_inds.size(),
-           reinterpret_cast<int*>(&bg_inds[0]), bg_inds.size() * sizeof(int));
+    return fg_bg_gt;
   }
 };
 
 class RpnTargetAssignOpMaker : public framework::OpProtoAndCheckerMaker {
  public:
   void Make() override {
+    AddInput("Anchor",
+             "(Tensor) input anchor is a 2-D Tensor with shape [H*W*A, 4].");
+    AddInput("GtBox", "(LoDTensor) input groud-truth bbox with shape [K, 4].");
     AddInput(
         "DistMat",
         "(LoDTensor or Tensor) this input is a 2-D LoDTensor with shape "
@@ -241,12 +305,15 @@ class RpnTargetAssignOpMaker : public framework::OpProtoAndCheckerMaker {
         "ScoreIndex",
         "(Tensor), The indexes of foreground and background anchors in all "
         "RPN anchors(The rest anchors are ignored). The shape of the "
-        "ScoreIndex is [F + B], F and B depend on the value of input "
-        "tensor and attributes.");
-    AddOutput("TargetLabel",
-              "(Tensor<int64_t>), The target labels of each anchor with shape "
-              "[K * M, 1], "
-              "K and M is the same as they are in DistMat.");
+        "ScoreIndex is [F + B], F and B are sampled foreground and backgroud "
+        " number.");
+    AddOutput("TargetBBox",
+              "(Tensor<int64_t>), The target bbox deltas with shape "
+              "[F, 4], F is the sampled foreground number.");
+    AddOutput(
+        "TargetLabel",
+        "(Tensor<int64_t>), The target labels of each anchor with shape "
+        "[F + B, 1], F and B are sampled foreground and backgroud number.");
     AddComment(R"DOC(
 This operator can be, for given the IoU between the ground truth bboxes and the
 anchors, to assign classification and regression targets to each prediction.

paddle/fluid/operators/roi_pool_op.cu

@@ -31,7 +31,7 @@ static inline int NumBlocks(const int N) {
 
 template <typename T>
 __global__ void GPUROIPoolForward(
-    const int nthreads, const T* input_data, const int64_t* input_rois,
+    const int nthreads, const T* input_data, const T* input_rois,
     const float spatial_scale, const int channels, const int height,
     const int width, const int pooled_height, const int pooled_width,
     int* roi_batch_id_data, T* output_data, int64_t* argmax_data) {
@@ -43,7 +43,7 @@ __global__ void GPUROIPoolForward(
     int c = (i / pooled_width / pooled_height) % channels;
     int n = i / pooled_width / pooled_height / channels;
 
-    const int64_t* offset_input_rois = input_rois + n * kROISize;
+    const T* offset_input_rois = input_rois + n * kROISize;
     int roi_batch_ind = roi_batch_id_data[n];
     int roi_start_w = round(offset_input_rois[0] * spatial_scale);
     int roi_start_h = round(offset_input_rois[1] * spatial_scale);
@@ -93,7 +93,7 @@ __global__ void GPUROIPoolForward(
 
 template <typename T>
 __global__ void GPUROIPoolBackward(
-    const int nthreads, const int64_t* input_rois, const T* output_grad,
+    const int nthreads, const T* input_rois, const T* output_grad,
     const int64_t* argmax_data, const int num_rois, const float spatial_scale,
     const int channels, const int height, const int width,
     const int pooled_height, const int pooled_width, int* roi_batch_id_data,
@@ -174,8 +174,8 @@ class GPUROIPoolOpKernel : public framework::OpKernel<T> {
 
     GPUROIPoolForward<
         T><<<blocks, threads, 0, ctx.cuda_device_context().stream()>>>(
-        output_size, in->data<T>(), rois->data<int64_t>(), spatial_scale,
-        channels, height, width, pooled_height, pooled_width,
+        output_size, in->data<T>(), rois->data<T>(), spatial_scale, channels,
+        height, width, pooled_height, pooled_width,
         roi_batch_id_list_gpu.data<int>(), out->mutable_data<T>(ctx.GetPlace()),
         argmax->mutable_data<int64_t>(ctx.GetPlace()));
   }
@@ -228,7 +228,7 @@ class GPUROIPoolGradOpKernel : public framework::OpKernel<T> {
       if (output_grad_size > 0) {
         GPUROIPoolBackward<
             T><<<blocks, threads, 0, ctx.cuda_device_context().stream()>>>(
-            output_grad_size, rois->data<int64_t>(), out_grad->data<T>(),
+            output_grad_size, rois->data<T>(), out_grad->data<T>(),
             argmax->data<int64_t>(), rois_num, spatial_scale, channels, height,
             width, pooled_height, pooled_width,
             roi_batch_id_list_gpu.data<int>(),

paddle/fluid/operators/roi_pool_op.h

@@ -72,7 +72,7 @@ class CPUROIPoolOpKernel : public framework::OpKernel<T> {
     T* output_data = out->mutable_data<T>(ctx.GetPlace());
     int64_t* argmax_data = argmax->mutable_data<int64_t>(ctx.GetPlace());
 
-    const int64_t* rois_data = rois->data<int64_t>();
+    const T* rois_data = rois->data<T>();
     for (int n = 0; n < rois_num; ++n) {
       int roi_batch_id = roi_batch_id_data[n];
       int roi_start_w = round(rois_data[0] * spatial_scale);
@@ -171,7 +171,7 @@ class CPUROIPoolGradOpKernel : public framework::OpKernel<T> {
         }
       }
 
-      const int64_t* rois_data = rois->data<int64_t>();
+      const T* rois_data = rois->data<T>();
       const T* out_grad_data = out_grad->data<T>();
       const int64_t* argmax_data = argmax->data<int64_t>();
       T* in_grad_data = in_grad->mutable_data<T>(ctx.GetPlace());

python/paddle/fluid/layers/detection.py

@@ -145,26 +145,23 @@ def rpn_target_assign(loc,
     """
 
     helper = LayerHelper('rpn_target_assign', **locals())
-    # 1. Compute the regression target bboxes
-    target_bbox = box_coder(
-        prior_box=anchor_box,
-        prior_box_var=anchor_var,
-        target_box=gt_box,
-        code_type='encode_center_size',
-        box_normalized=False)
-    # 2. Compute overlaps between the prior boxes and the gt boxes overlaps
+    # Compute overlaps between the prior boxes and the gt boxes overlaps
     iou = iou_similarity(x=gt_box, y=anchor_box)
-    # 3. Assign target label to anchors
-    loc_index = helper.create_tmp_variable(dtype=anchor_box.dtype)
-    score_index = helper.create_tmp_variable(dtype=anchor_box.dtype)
-    target_label = helper.create_tmp_variable(dtype=anchor_box.dtype)
+    # Assign target label to anchors
+    loc_index = helper.create_tmp_variable(dtype='int32')
+    score_index = helper.create_tmp_variable(dtype='int32')
+    target_label = helper.create_tmp_variable(dtype='int64')
+    target_bbox = helper.create_tmp_variable(dtype=anchor_box.dtype)
     helper.append_op(
         type="rpn_target_assign",
-        inputs={'DistMat': iou},
+        inputs={'Anchor': anchor_box,
+                'GtBox': gt_box,
+                'DistMat': iou},
         outputs={
             'LocationIndex': loc_index,
             'ScoreIndex': score_index,
-            'TargetLabel': target_label
+            'TargetLabel': target_label,
+            'TargetBBox': target_bbox,
         },
         attrs={
             'rpn_batch_size_per_im': rpn_batch_size_per_im,
@@ -173,16 +170,16 @@ def rpn_target_assign(loc,
             'fg_fraction': fg_fraction
         })
 
-    # 4. Reshape and gather the target entry
-    scores = nn.reshape(x=scores, shape=(-1, 2))
-    loc = nn.reshape(x=loc, shape=(-1, 4))
-    target_label = nn.reshape(x=target_label, shape=(-1, 1))
-    target_bbox = nn.reshape(x=target_bbox, shape=(-1, 4))
+    loc_index.stop_gradient = True
+    score_index.stop_gradient = True
+    target_label.stop_gradient = True
+    target_bbox.stop_gradient = True
 
+    scores = nn.reshape(x=scores, shape=(-1, 1))
+    loc = nn.reshape(x=loc, shape=(-1, 4))
     predicted_scores = nn.gather(scores, score_index)
     predicted_location = nn.gather(loc, loc_index)
-    target_label = nn.gather(target_label, score_index)
-    target_bbox = nn.gather(target_bbox, loc_index)
+
     return predicted_scores, predicted_location, target_label, target_bbox
 
 

python/paddle/fluid/tests/test_detection.py

@@ -281,7 +281,7 @@ class TestRpnTargetAssign(unittest.TestCase):
             gt_box = layers.data(
                 name='gt_box', shape=[4], lod_level=1, dtype='float32')
 
-            predicted_scores, predicted_location, target_label, target_bbox = layers.rpn_target_assign(
+            pred_scores, pred_loc, tgt_lbl, tgt_bbox = layers.rpn_target_assign(
                 loc=loc,
                 scores=scores,
                 anchor_box=anchor_box,
@@ -292,15 +292,13 @@ class TestRpnTargetAssign(unittest.TestCase):
                 rpn_positive_overlap=0.7,
                 rpn_negative_overlap=0.3)
 
-            self.assertIsNotNone(predicted_scores)
-            self.assertIsNotNone(predicted_location)
-            self.assertIsNotNone(target_label)
-            self.assertIsNotNone(target_bbox)
-            assert predicted_scores.shape[1] == 2
-            assert predicted_location.shape[1] == 4
-            assert predicted_location.shape[1] == target_bbox.shape[1]
-
-        print(str(program))
+            self.assertIsNotNone(pred_scores)
+            self.assertIsNotNone(pred_loc)
+            self.assertIsNotNone(tgt_lbl)
+            self.assertIsNotNone(tgt_bbox)
+            assert pred_scores.shape[1] == 1
+            assert pred_loc.shape[1] == 4
+            assert pred_loc.shape[1] == tgt_bbox.shape[1]
 
 
 class TestGenerateProposals(unittest.TestCase):

python/paddle/fluid/tests/unittests/test_generate_proposal_labels.py

@@ -177,8 +177,8 @@ def _box_to_delta(ex_boxes, gt_boxes, weights):
 
     dx = (gt_ctr_x - ex_ctr_x) / ex_w / weights[0]
     dy = (gt_ctr_y - ex_ctr_y) / ex_h / weights[1]
-    dw = (np.log(gt_w / ex_w)) / ex_w / weights[2]
-    dh = (np.log(gt_h / ex_h)) / ex_h / weights[3]
+    dw = (np.log(gt_w / ex_w)) / weights[2]
+    dh = (np.log(gt_h / ex_h)) / weights[3]
 
     targets = np.vstack([dx, dy, dw, dh]).transpose()
     return targets

python/paddle/fluid/tests/unittests/test_roi_pool_op.py

@@ -61,7 +61,7 @@ class TestROIPoolOp(OpTest):
 
         for i in range(self.rois_num):
             roi = self.rois[i]
-            roi_batch_id = roi[0]
+            roi_batch_id = int(roi[0])
             roi_start_w = int(cpt.round(roi[1] * self.spatial_scale))
             roi_start_h = int(cpt.round(roi[2] * self.spatial_scale))
             roi_end_w = int(cpt.round(roi[3] * self.spatial_scale))
@@ -125,7 +125,7 @@ class TestROIPoolOp(OpTest):
                 roi = [bno, x1, y1, x2, y2]
                 rois.append(roi)
         self.rois_num = len(rois)
-        self.rois = np.array(rois).astype("int64")
+        self.rois = np.array(rois).astype("float32")
 
     def setUp(self):
         self.op_type = "roi_pool"

python/paddle/fluid/tests/unittests/test_rpn_target_assign_op.py

@@ -18,12 +18,17 @@ import unittest
 import numpy as np
 import paddle.fluid.core as core
 from op_test import OpTest
+from test_anchor_generator_op import anchor_generator_in_python
+from test_generate_proposal_labels import _generate_groundtruth
+from test_generate_proposal_labels import _bbox_overlaps, _box_to_delta
 
 
-def rpn_target_assign(iou, rpn_batch_size_per_im, rpn_positive_overlap,
-                      rpn_negative_overlap, fg_fraction):
-    iou = np.transpose(iou)
+def rpn_target_assign(gt_anchor_iou, rpn_batch_size_per_im,
+                      rpn_positive_overlap, rpn_negative_overlap, fg_fraction):
+    iou = np.transpose(gt_anchor_iou)
     anchor_to_gt_max = iou.max(axis=1)
+    anchor_to_gt_argmax = iou.argmax(axis=1)
+
     gt_to_anchor_argmax = iou.argmax(axis=0)
     gt_to_anchor_max = iou[gt_to_anchor_argmax, np.arange(iou.shape[1])]
     anchors_with_max_overlap = np.where(iou == gt_to_anchor_max)[0]
@@ -42,59 +47,113 @@ def rpn_target_assign(iou, rpn_batch_size_per_im, rpn_positive_overlap,
 
     num_bg = rpn_batch_size_per_im - np.sum(tgt_lbl == 1)
     bg_inds = np.where(anchor_to_gt_max < rpn_negative_overlap)[0]
+    tgt_lbl[bg_inds] = 0
     if len(bg_inds) > num_bg:
         enable_inds = bg_inds[np.random.randint(len(bg_inds), size=num_bg)]
         tgt_lbl[enable_inds] = 0
     bg_inds = np.where(tgt_lbl == 0)[0]
+    tgt_lbl[bg_inds] = 0
 
     loc_index = fg_inds
     score_index = np.hstack((fg_inds, bg_inds))
     tgt_lbl = np.expand_dims(tgt_lbl, axis=1)
-    return loc_index, score_index, tgt_lbl
+
+    gt_inds = anchor_to_gt_argmax[fg_inds]
+
+    return loc_index, score_index, tgt_lbl, gt_inds
+
+
+def get_anchor(n, c, h, w):
+    input_feat = np.random.random((n, c, h, w)).astype('float32')
+    anchors, _ = anchor_generator_in_python(
+        input_feat=input_feat,
+        anchor_sizes=[32., 64.],
+        aspect_ratios=[0.5, 1.0],
+        variances=[1.0, 1.0, 1.0, 1.0],
+        stride=[16.0, 16.0],
+        offset=0.5)
+    return anchors
+
+
+def rpn_blob(anchor, gt_boxes, iou, lod, rpn_batch_size_per_im,
+             rpn_positive_overlap, rpn_negative_overlap, fg_fraction):
+
+    loc_indexes = []
+    score_indexes = []
+    tmp_tgt_labels = []
+    tgt_bboxes = []
+    anchor_num = anchor.shape[0]
+
+    batch_size = len(lod) - 1
+    for i in range(batch_size):
+        b, e = lod[i], lod[i + 1]
+        iou_slice = iou[b:e, :]
+        bboxes_slice = gt_boxes[b:e, :]
+
+        loc_idx, score_idx, tgt_lbl, gt_inds = rpn_target_assign(
+            iou_slice, rpn_batch_size_per_im, rpn_positive_overlap,
+            rpn_negative_overlap, fg_fraction)
+
+        fg_bboxes = bboxes_slice[gt_inds]
+        fg_anchors = anchor[loc_idx]
+        box_deltas = _box_to_delta(fg_anchors, fg_bboxes, [1., 1., 1., 1.])
+
+        if i == 0:
+            loc_indexes = loc_idx
+            score_indexes = score_idx
+            tmp_tgt_labels = tgt_lbl
+            tgt_bboxes = box_deltas
+        else:
+            loc_indexes = np.concatenate(
+                [loc_indexes, loc_idx + i * anchor_num])
+            score_indexes = np.concatenate(
+                [score_indexes, score_idx + i * anchor_num])
+            tmp_tgt_labels = np.concatenate([tmp_tgt_labels, tgt_lbl])
+            tgt_bboxes = np.vstack([tgt_bboxes, box_deltas])
+
+    tgt_labels = tmp_tgt_labels[score_indexes]
+    return loc_indexes, score_indexes, tgt_bboxes, tgt_labels
 
 
 class TestRpnTargetAssignOp(OpTest):
     def setUp(self):
-        iou = np.random.random((10, 8)).astype("float32")
-        self.op_type = "rpn_target_assign"
-        self.inputs = {'DistMat': iou}
-        self.attrs = {
-            'rpn_batch_size_per_im': 256,
-            'rpn_positive_overlap': 0.95,
-            'rpn_negative_overlap': 0.3,
-            'fg_fraction': 0.25,
-            'fix_seed': True
-        }
-        loc_index, score_index, tgt_lbl = rpn_target_assign(iou, 256, 0.95, 0.3,
-                                                            0.25)
-        self.outputs = {
-            'LocationIndex': loc_index,
-            'ScoreIndex': score_index,
-            'TargetLabel': tgt_lbl,
-        }
+        n, c, h, w = 2, 4, 14, 14
+        anchor = get_anchor(n, c, h, w)
+        gt_num = 10
+        anchor = anchor.reshape(-1, 4)
+        anchor_num = anchor.shape[0]
 
-    def test_check_output(self):
-        self.check_output()
+        im_shapes = [[64, 64], [64, 64]]
+        gt_box, lod = _generate_groundtruth(im_shapes, 3, 4)
+        bbox = np.vstack([v['boxes'] for v in gt_box])
 
+        iou = _bbox_overlaps(bbox, anchor)
+
+        anchor = anchor.astype('float32')
+        bbox = bbox.astype('float32')
+        iou = iou.astype('float32')
+
+        loc_index, score_index, tgt_bbox, tgt_lbl = rpn_blob(
+            anchor, bbox, iou, [0, 4, 8], 25600, 0.95, 0.03, 0.25)
 
-class TestRpnTargetAssignOp2(OpTest):
-    def setUp(self):
-        iou = np.random.random((10, 20)).astype("float32")
         self.op_type = "rpn_target_assign"
-        self.inputs = {'DistMat': iou}
+        self.inputs = {
+            'Anchor': anchor,
+            'GtBox': (bbox, [[4, 4]]),
+            'DistMat': (iou, [[4, 4]]),
+        }
         self.attrs = {
-            'rpn_batch_size_per_im': 128,
-            'rpn_positive_overlap': 0.5,
-            'rpn_negative_overlap': 0.5,
-            'fg_fraction': 0.5,
+            'rpn_batch_size_per_im': 25600,
+            'rpn_positive_overlap': 0.95,
+            'rpn_negative_overlap': 0.03,
+            'fg_fraction': 0.25,
             'fix_seed': True
         }
-        loc_index, score_index, tgt_lbl = rpn_target_assign(iou, 128, 0.5, 0.5,
-                                                            0.5)
         self.outputs = {
-            'LocationIndex': loc_index,
-            'ScoreIndex': score_index,
-            'TargetLabel': tgt_lbl,
+            'LocationIndex': loc_index.astype('int32'),
+            'ScoreIndex': score_index.astype('int32'),
+            'TargetBBox': tgt_bbox.astype('float32'),
+            'TargetLabel': tgt_lbl.astype('int64'),
         }
 
     def test_check_output(self):