Merge pull request #24367 from alexlyulkov:al/fixed-cumsum-inplace-flag

Fixed CumSum layer inplace flag #24367

When exclusive is false:
dst[i] = dst[i-1] + src[i]
When exclusive is true:
dst[i] = dst[i-1] + src[i-1]
So CumSum layer can be inplace only when exclusive flag is false.

modules/dnn/src/layers/cumsum_layer.cpp

@@ -29,7 +29,7 @@ public:
                          std::vector<MatShape> &internals) const CV_OVERRIDE
     {
         Layer::getMemoryShapes(inputs, requiredOutputs, outputs, internals);
-        return true;
+        return exclusive_raw == 0;
     }
 
     void forward(InputArrayOfArrays inputs_arr, OutputArrayOfArrays outputs_arr, OutputArrayOfArrays internals_arr) CV_OVERRIDE

modules/dnn/test/test_onnx_importer.cpp

@@ -785,6 +785,11 @@ TEST_P(Test_ONNX_layers, Concatenation)
     testONNXModels("concat_const_blobs");
 }
 
+TEST_P(Test_ONNX_layers, CumSumExclusiveInplace)
+{
+    testONNXModels("cumsum_exclusive_inplace");
+}
+
 TEST_P(Test_ONNX_layers, Eltwise3D)
 {
 #if defined(INF_ENGINE_RELEASE) && INF_ENGINE_VER_MAJOR_LT(2021040000)