code: def test_set_dtype_subregion():
      func = element_wise_subregion_match
      sch = tir.Schedule(func, debug_mask="all")
      sch.unsafe_set_dtype(sch.get_block("B"), 0, "float16")
      assert_structural_equal_ignore_global_symbol(
          element_wise_subregion_match_set_dtype, sch.mod["main"]
      )
      verify_trace_roundtrip(sch=sch, mod=func)
  
file_path: tvm/tests/python/tir-schedule/test_tir_schedule_set_dtype.py
imports: import pytest
  import tvm
  import tvm.testing
  from tvm import tir
  from tvm.script import tir
  from tvm.tir.schedule.testing import assert_structural_equal_ignore_global_symbol, verify_trace_roundtrip
label_desc: Use image node_id 8 for calling a global function with example usage: test_set_dtype_subregion() without return types