Import wrapped Dropout subgraphs from TensorFlow

modules/dnn/src/tensorflow/tf_importer.cpp

@@ -363,7 +363,7 @@ void RemoveIdentityOps(tensorflow::GraphDef& net) {
         const tensorflow::NodeDef &layer = net.node(li);
         String type = layer.op();
 
-        if (type == "Identity") {
+        if (type == "Identity" || type == "Dropout") {
             identity_ops_idx.push_back(li);
             identity_ops[layer.name()] = layer.input(0);
         }

modules/dnn/test/test_tf_importer.cpp

@@ -138,6 +138,11 @@ TEST(Test_TensorFlow, matmul)
     runTensorFlowNet("matmul");
 }
 
+TEST(Test_TensorFlow, defun)
+{
+    runTensorFlowNet("defun_dropout");
+}
+
 TEST(Test_TensorFlow, fp16)
 {
     const float l1 = 1e-3;