Remove 'Tensor' object include from GlobalAvgPool_Op and move setBackend...

Remove 'Tensor' object include from GlobalAvgPool_Op and move setBackend member function from header to source file

include/aidge/operator/GlobalAveragePooling.hpp

@@ -17,8 +17,6 @@
 #include <vector>
 
 #include "aidge/backend/OperatorImpl.hpp"
-#include "aidge/data/Data.hpp"
-#include "aidge/data/Tensor.hpp"
 #include "aidge/graph/Node.hpp"
 #include "aidge/operator/OperatorTensor.hpp"
 #include "aidge/utils/Registrar.hpp"
@@ -43,9 +41,9 @@ public:
 
   GlobalAveragePooling_Op(const GlobalAveragePooling_Op &op)
       : OperatorTensor(op) {
-        if (op.mImpl){
-            SET_IMPL_MACRO(GlobalAveragePooling_Op, *this, op.mOutputs[0]->getImpl()->backend());
-        }else{
+        if (op.mImpl) {
+            SET_IMPL_MACRO(GlobalAveragePooling_Op, *this, op.backend());
+        } else {
             mImpl = nullptr;
         }
   }
@@ -56,10 +54,7 @@ public:
 
   void computeOutputDims() override final;
 
-  void setBackend(const std::string &name, DeviceIdx_t device = 0) override {
-    SET_IMPL_MACRO(GlobalAveragePooling_Op, *this, name);
-    mOutputs[0]->setBackend(name, device);
-  }
+  void setBackend(const std::string &name, DeviceIdx_t device = 0) override final;
 
   static const std::vector<std::string> getInputsName() {
     return {"data_input"};

src/operator/GlobalAveragePooling.cpp

@@ -40,3 +40,8 @@ void Aidge::GlobalAveragePooling_Op::computeOutputDims() {
     mOutputs[0]->resize(out_dims);
   }
 }
+
+void Aidge::GlobalAveragePooling_Op::setBackend(const std::string &name, DeviceIdx_t device) {
+    SET_IMPL_MACRO(GlobalAveragePooling_Op, *this, name);
+    mOutputs[0]->setBackend(name, device);
+}
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