Fix prior box generation in case of squared proposals.

Fix batch norm in training phase.

modules/dnn/src/caffe/caffe_importer.cpp

@@ -335,6 +335,28 @@ public:
                 }
                 continue;
             }
+            else if (type == "BatchNorm")
+            {
+                if (!layerParams.get<bool>("use_global_stats", true))
+                {
+                    CV_Assert(layer.bottom_size() == 1, layer.top_size() == 1);
+
+                    LayerParams mvnParams;
+                    mvnParams.set("eps", layerParams.get<float>("eps", 1e-5));
+                    std::string mvnName = name + "/mvn";
+
+                    int repetitions = layerCounter[mvnName]++;
+                    if (repetitions)
+                        mvnName += String("_") + toString(repetitions);
+
+                    int mvnId = dstNet.addLayer(mvnName, "MVN", mvnParams);
+                    addInput(layer.bottom(0), mvnId, 0, dstNet);
+                    addOutput(layer, mvnId, 0);
+                    net.mutable_layer(li)->set_bottom(0, layer.top(0));
+                    layerParams.blobs[0].setTo(0);  // mean
+                    layerParams.blobs[1].setTo(1);  // std
+                }
+            }
 
             int id = dstNet.addLayer(name, type, layerParams);
 

modules/dnn/src/layers/batch_norm_layer.cpp

@@ -36,6 +36,7 @@ public:
 
         hasWeights = params.get<bool>("has_weight", false);
         hasBias = params.get<bool>("has_bias", false);
+        useGlobalStats = params.get<bool>("use_global_stats", true);
         if(params.get<bool>("scale_bias", false))
             hasWeights = hasBias = true;
         epsilon = params.get<float>("eps", 1E-5);
@@ -46,7 +47,7 @@ public:
                   blobs[0].type() == CV_32F && blobs[1].type() == CV_32F);
 
         float varMeanScale = 1.f;
-        if (!hasWeights && !hasBias && blobs.size() > 2) {
+        if (!hasWeights && !hasBias && blobs.size() > 2 && useGlobalStats) {
             CV_Assert(blobs.size() == 3, blobs[2].type() == CV_32F);
             varMeanScale = blobs[2].at<float>(0);
             if (varMeanScale != 0)
@@ -100,6 +101,8 @@ public:
                          std::vector<MatShape> &outputs,
                          std::vector<MatShape> &internals) const
     {
+        if (!useGlobalStats && inputs[0][0] != 1)
+            CV_Error(Error::StsNotImplemented, "Batch normalization in training mode with batch size > 1");
         Layer::getMemoryShapes(inputs, requiredOutputs, outputs, internals);
         return true;
     }
@@ -304,6 +307,9 @@ public:
         }
         return flops;
     }
+
+private:
+    bool useGlobalStats;
 };
 
 Ptr<BatchNormLayer> BatchNormLayer::create(const LayerParams& params)

modules/dnn/src/layers/prior_box_layer.cpp

@@ -109,15 +109,11 @@ public:
         for (int i = 0; i < aspectRatioParameter.size(); ++i)
         {
             float aspectRatio = aspectRatioParameter.get<float>(i);
-            bool alreadyExists = false;
+            bool alreadyExists = fabs(aspectRatio - 1.f) < 1e-6f;
 
-            for (size_t j = 0; j < _aspectRatios.size(); ++j)
+            for (size_t j = 0; j < _aspectRatios.size() && !alreadyExists; ++j)
             {
-                if (fabs(aspectRatio - _aspectRatios[j]) < 1e-6)
-                {
-                    alreadyExists = true;
-                    break;
-                }
+                alreadyExists = fabs(aspectRatio - _aspectRatios[j]) < 1e-6;
             }
             if (!alreadyExists)
             {
@@ -215,7 +211,7 @@ public:
         }
         else
         {
-            CV_Assert(!_aspectRatios.empty(), _minSize > 0);
+            CV_Assert(_minSize > 0);
             _boxWidths.resize(1 + (_maxSize > 0 ? 1 : 0) + _aspectRatios.size());
             _boxHeights.resize(_boxWidths.size());
             _boxWidths[0] = _boxHeights[0] = _minSize;
@@ -492,10 +488,12 @@ public:
         ieLayer->params["min_size"] = format("%f", _minSize);
         ieLayer->params["max_size"] = _maxSize > 0 ? format("%f", _maxSize) : "";
 
-        CV_Assert(!_aspectRatios.empty());
-        ieLayer->params["aspect_ratio"] = format("%f", _aspectRatios[0]);
-        for (int i = 1; i < _aspectRatios.size(); ++i)
-            ieLayer->params["aspect_ratio"] += format(",%f", _aspectRatios[i]);
+        if (!_aspectRatios.empty())
+        {
+            ieLayer->params["aspect_ratio"] = format("%f", _aspectRatios[0]);
+            for (int i = 1; i < _aspectRatios.size(); ++i)
+                ieLayer->params["aspect_ratio"] += format(",%f", _aspectRatios[i]);
+        }
 
         ieLayer->params["flip"] = _flip ? "1" : "0";
         ieLayer->params["clip"] = _clip ? "1" : "0";

modules/dnn/test/test_layers.cpp

@@ -252,6 +252,11 @@ TEST(Layer_Test_BatchNorm, Accuracy)
     testLayerUsingCaffeModels("layer_batch_norm", DNN_TARGET_CPU, true);
 }
 
+TEST(Layer_Test_BatchNorm, local_stats)
+{
+    testLayerUsingCaffeModels("layer_batch_norm_local_stats", DNN_TARGET_CPU, true, false);
+}
+
 TEST(Layer_Test_ReLU, Accuracy)
 {
     testLayerUsingCaffeModels("layer_relu");
@@ -831,4 +836,33 @@ TEST(Layer_Test_Average_pooling_kernel_area, Accuracy)
     normAssert(out, blobFromImage(target));
 }
 
+// Test PriorBoxLayer in case of no aspect ratios (just squared proposals).
+TEST(Layer_PriorBox, squares)
+{
+    LayerParams lp;
+    lp.name = "testPriorBox";
+    lp.type = "PriorBox";
+    lp.set("min_size", 32);
+    lp.set("flip", true);
+    lp.set("clip", true);
+    float variance[] = {0.1f, 0.1f, 0.2f, 0.2f};
+    float aspectRatios[] = {1.0f};  // That should be ignored.
+    lp.set("variance", DictValue::arrayReal<float*>(&variance[0], 4));
+    lp.set("aspect_ratio", DictValue::arrayReal<float*>(&aspectRatios[0], 1));
+
+    Net net;
+    int id = net.addLayerToPrev(lp.name, lp.type, lp);
+    net.connect(0, 0, id, 1);  // The second input is an input image. Shapes are used for boxes normalization.
+    Mat inp(1, 2, CV_32F);
+    randu(inp, -1, 1);
+    net.setInput(blobFromImage(inp));
+    Mat out = net.forward();
+
+    Mat target = (Mat_<float>(4, 4) << -7.75f, -15.5f, 8.25f, 16.5f,
+                                       -7.25f, -15.5f, 8.75f, 16.5f,
+                                       0.1f, 0.1f, 0.2f, 0.2f,
+                                       0.1f, 0.1f, 0.2f, 0.2f);
+    normAssert(out.reshape(1, 4), target);
+}
+
 }} // namespace