code: def test_ref_read():
      v = relay.Var("v")
      assign = relay.Let(
          v, relay.RefCreate(relay.Tuple([])), relay.RefRead(v)
      )
      read_val = run_as_python(assign)
      assert_adt_len(read_val, 0)
  
imports: import numpy
  import tvm
  from tvm import te
  from tvm import relay
  from tvm.relay.testing import run_as_python
  from tvm.relay.prelude import Prelude
  from tvm.runtime.container import ADT
  from tvm.relay.backend.interpreter import RefValue, ConstructorValue
label_desc: Use image node_id 13 for calling a global function with example usage: test_ref_read() without return types