code: def test_image_dtype(dtype):
      a = np.zeros((3, 3), dtype=dtype)
      assert gaussian(a).dtype == _supported_float_type(a.dtype)
  
file_path: scikit-image/skimage/filters/tests/test_gaussian.py
imports: import numpy
  import pytest
  from numpy.testing import assert_array_equal
  from skimage._shared.utils import _supported_float_type
  from skimage.filters import difference_of_gaussians, gaussian
label_desc: Use image node_id 4 for calling a global function with example usage: test_image_dtype(dtype) without return types