[fix] MetaOperator.setBackend no longer set backend of graph if an implementation is available.

src/operator/MetaOperator.cpp

@@ -87,12 +87,26 @@ void Aidge::MetaOperator_Op::setBackend(const std::string &name, Aidge::DeviceId
     if (Registrar<MetaOperator_Op>::exists({name, type()})) {
         // A custom implementation exists for this meta operator
         mImpl = Registrar<MetaOperator_Op>::create({name, type()})(*this);
+
+        // Set backend for in/out tensor of the MetaOp
+        for(auto i: mGraph->inputNodes()){
+            auto op_i = std::static_pointer_cast<OperatorTensor>(i->getOperator());
+            for(std::size_t in_idx=0; in_idx < op_i->nbInputs(); ++in_idx){
+                op_i->getInput(in_idx)->setBackend(name, device);
+            }
+        }
+        for(auto o: mGraph->outputNodes()){
+            auto op_o = std::static_pointer_cast<OperatorTensor>(o->getOperator());
+            for(std::size_t out_idx=0; out_idx < op_o->nbOutputs(); ++out_idx){
+                op_o->getOutput(out_idx)->setBackend(name, device);
+            }
+        }
+    }else{
+        // Input/output tensors backend are also updated here.
+        mGraph->setBackend(name, device);
     }
 
-    // The micro-graph should always be set to the right backend, since it
-    // shares input/output tensors.
-    // Input/output tensors backend are updated here.
-    mGraph->setBackend(name, device);
+
 }
 
 std::set<std::string> Aidge::MetaOperator_Op::getAvailableBackends() const {