code: def test_func_tuple_type():
      nodes = [
          {"type_key": ""},
          {
              "type_key": "relay.FuncType",
              "attrs": {
                  "arg_types": "2",
                  "ret_type": "3",
                  "span": "0",
                  "type_constraints": "6",
                  "type_params": "5",
              },
          },
          {"type_key": "Array"},
          {
              "type_key": "relay.TupleType",
              "attrs": {"fields": "4", "span": "0"},
          },
          {"type_key": "Array"},
          {"type_key": "Array"},
          {"type_key": "Array"},
      ]
      data = {
          "root": 1,
          "nodes": nodes,
          "attrs": {"tvm_version": "0.6.0"},
          "b64ndarrays": [],
      }
      tvar = tvm.ir.load_json(json.dumps(data))
      assert isinstance(tvar, tvm.ir.FuncType)
  
file_path: tvm/tests/python/relay/test_json_compact.py
imports: import tvm
  from tvm import relay
  from tvm import te
  import json
label_desc: Use image node_id 4 for calling a global function with example usage: test_func_tuple_type() without return types