Upd compile_gradient function

src/recipes/GraphViewHelper.cpp

@@ -12,11 +12,12 @@
 #include <memory>
 #include <set>
 
+#include "aidge/data/Tensor.hpp"
 #include "aidge/graph/Node.hpp"
 #include "aidge/graph/GraphView.hpp"
 #include "aidge/operator/OperatorTensor.hpp"
 #include "aidge/utils/ErrorHandling.hpp"
-#include "aidge/recipies/GraphViewHelper.hpp"
+#include "aidge/recipes/GraphViewHelper.hpp"
 
 
 std::set<std::shared_ptr<Aidge::Tensor>> Aidge::producers(std::shared_ptr<Aidge::GraphView> graphview) {
@@ -47,12 +48,10 @@ std::set<std::shared_ptr<Aidge::Tensor>> Aidge::parameters(std::shared_ptr<Aidge
 void Aidge::compile_gradient(std::shared_ptr<Aidge::GraphView> gv) {
     for (const auto& node : gv->getNodes()) {
         // TODO: check that each node is an OperatorTensor
-        AIDGE_ASSERT(node->getOperator()->operatorType() == OperatorType::Tensor, "Cannot instanciate gradient of an Operator that doesn't use Tensor.");
-        const std::shared_ptr<OperatorTensor> op = std::static_pointer_cast<OperatorTensor>(node -> getOperator());
+        AIDGE_ASSERT(node->getOperator()->operatorType() == OperatorType::Tensor, "Cannot instanciate gradient of an Operator ({}) that doesn't use Tensor.", node->getOperator()->type());
+        const std::shared_ptr<OperatorTensor> op = std::dynamic_pointer_cast<OperatorTensor>(node -> getOperator());
         for (std::size_t o = 0; o < node -> nbOutputs(); ++o) {
-           const auto& t = op->getOutput(o);
-           t -> grad() -> setDataType(t -> dataType());
-           t -> grad() -> setBackend(t -> getImpl() -> backend());
+            op->getOutput(o)->initGradient();
         }
     }
 }
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