[0.23.2] test_active_contour_model.py fails on mips64el

[olebole]

Description:

When building the Debian package for 0.23.2, I observe a number of test failures in skimage/segmentation/tests/test_active_contour_model.py, namely test_periodic_reference, test_fixed_reference, test_free_reference, test_RGB (all for all tested dtypes). The failure is

_______________________ test_periodic_reference[float32] _______________________

dtype = <class 'numpy.float32'>

    @pytest.mark.parametrize('dtype', [np.float16, np.float32, np.float64])
    def test_periodic_reference(dtype):
        img = data.astronaut()
        img = rgb2gray(img)
        s = np.linspace(0, 2 * np.pi, 400)
        r = 100 + 100 * np.sin(s)
        c = 220 + 100 * np.cos(s)
        init = np.array([r, c]).T
        img_smooth = gaussian(img, sigma=3, preserve_range=False).astype(dtype, copy=False)
        snake = active_contour(
            img_smooth, init, alpha=0.015, beta=10, w_line=0, w_edge=1, gamma=0.001
        )
        assert snake.dtype == _supported_float_type(dtype)
        refr = [98, 99, 100, 101, 102, 103, 104, 105, 106, 108]
        refc = [299, 298, 298, 298, 298, 297, 297, 296, 296, 295]
>       assert_equal(np.array(snake[:10, 0], dtype=np.int32), refr)

skimage/segmentation/tests/test_active_contour_model.py:27: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

args = (<built-in function eq>, array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0], dtype=int32), [98, 99, 100, 101, 102, 103, ...])
kwds = {'err_msg': '', 'header': 'Arrays are not equal', 'strict': False, 'verbose': True}

    @wraps(func)
    def inner(*args, **kwds):
        with self._recreate_cm():
>           return func(*args, **kwds)
E           AssertionError: 
E           Arrays are not equal
E           
E           Mismatched elements: 10 / 10 (100%)
E           Max absolute difference: 108
E           Max relative difference: 1.
E            x: array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0], dtype=int32)
E            y: array([ 98,  99, 100, 101, 102, 103, 104, 105, 106, 108])

/usr/lib/python3.11/contextlib.py:81: AssertionError

On other platforms, these tests pass. I also did not observe it on 0.23.1.

Way to reproduce:

Mips64el is 64-bit little endian.
Full build log (inclusive tests) here.

Version information:

* Python 3.11.9 and 3.12.3
* numpy 1.26.4
* skimage 0.23.2