Fix Fold creation function missing template

src/operator/Fold.cpp

@@ -95,4 +95,6 @@ std::shared_ptr<Aidge::Node> Aidge::Fold(const std::array<Aidge::DimSize_t, DIM>
     // FIXME: properly handle default w&b initialization in every cases
     AIDGE_ASSERT(DIM<=MaxDim, "Too many kernel dimensions required by Fold, not supported", Fold_Op<DIM>::Type);
     return std::make_shared<Node>(std::make_shared<Fold_Op<static_cast<DimIdx_t>(DIM)>>(outputDims, kernelDims, strideDims, dilationDims), name);
-}
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+}
+
+template std::shared_ptr<Aidge::Node> Aidge::Fold<2>(const std::array<Aidge::DimSize_t, 2>&, const std::array<Aidge::DimSize_t, 2>&, const std::string&, const std::array<Aidge::DimSize_t, 2>&, const std::array<Aidge::DimSize_t, 2>&);
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