code: def test_op():
      nodes = [
          {"type_key": ""},
          {"type_key": "relay.Op", "global_key": "nn.conv2d"},
      ]
      data = {
          "root": 1,
          "nodes": nodes,
          "attrs": {"tvm_version": "0.6.0"},
          "b64ndarrays": [],
      }
      op = tvm.ir.load_json(json.dumps(data))
      assert op == relay.op.get("nn.conv2d")
  
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 6 for calling a global function with example usage: test_op() without return types