code: def test_canon_target_and_host_1():
      target = None
      host = "llvm"
      with pytest.raises(
          AssertionError,
          match=r"Target host is not empty when target is empty.",
      ):
          target, host = Target.canon_target_and_host(target, host)
  
imports: import json
  import pytest
  import tvm
  import tvm.testing
  from tvm.target import Target, arm_cpu, bifrost, cuda, intel_graphics, mali, rocm, vta
label_desc: Use image node_id 33 for calling a global function with example usage: test_canon_target_and_host_1() without return types