code: def test_dtypes():
      assert chainerx.dtype is numpy.dtype
      assert chainerx.bool_ is numpy.bool_
      assert chainerx.int8 is numpy.int8
      assert chainerx.int16 is numpy.int16
      assert chainerx.int32 is numpy.int32
      assert chainerx.int64 is numpy.int64
      assert chainerx.uint8 is numpy.uint8
      assert chainerx.float16 is numpy.float16
      assert chainerx.float32 is numpy.float32
      assert chainerx.float64 is numpy.float64
  
label_desc: Use image node_id 2 for calling a global function with example usage: test_dtypes() without return types