code: def test_tensorize_vnni():
      tensorize_16x4_test()
  
imports: import pytest
  import tvm
  import tvm.testing
  from tvm import te, tir
  from tvm.script import tir
  from tvm.tir.schedule.testing import assert_structural_equal_ignore_global_symbol, verify_trace_roundtrip
  from tvm.tir.tensor_intrin.arm_cpu import DP4A_INTRIN, ARM_DOT_4x4_i8_NEON_INTRIN, ARM_DOT_4x4_i8_SDOT_INTRIN
  from tvm.tir.tensor_intrin.rocm import AMDGPU_SDOT4_INTRIN
  from tvm.tir.tensor_intrin.x86 import VNNI_DOT_16x4_INTRIN, AVX512_DOT_16x4_INTRIN
  from tvm.tir.tensor_intrin.hexagon import VRMPY_u8u8i32_INTRIN, VDMPY_i16i16i32_INTRIN
label_desc: Use image node_id 25 for calling a global function with example usage: test_tensorize_vnni() without return types