Added folding example

unit_tests/recipies/Test_ConvToMatMul.cpp

@@ -63,4 +63,14 @@ TEST_CASE("[ConvToMatMul] conv") {
     auto g1OutOp = std::static_pointer_cast<OperatorTensor>((*g1->outputNodes().cbegin())->getOperator());
     auto g2OutOp = std::static_pointer_cast<OperatorTensor>((*g1->outputNodes().cbegin())->getOperator());
     REQUIRE(*(g1OutOp->getOutput(0)) == *(g2OutOp->getOutput(0)));
+
+    // Simplify the graph: freeze parameters to allow reshaping of the Producers
+    for (auto node : g2->getNodes()) {
+        if (node->type() == Producer_Op::Type && node->name() != "dataProvider") {
+            std::static_pointer_cast<Producer_Op>(node->getOperator())->getAttr<bool>("Constant") = true;
+        }
+    }
+
+    constantFolding(g2);
+    g2->save("convToMatMul_after_folding");
 }