Add new PINN sample: pigu_hybrid_pinn

Author: inaniloquentee

samples/pigu_hybrid_pinn/graph_net.json

@@ -0,0 +1,7 @@
+{
+    "framework": "torch",
+    "num_devices_required": 1,
+    "num_nodes_required": 1,
+    "dynamic": true,
+    "model_name": "pigu_hybrid_pinn"
+}