def METHOD_NAME(cls):
    return xr.Dataset(dict(a=(('y', 'x'), [[0.1, 0.2, 0.4, 0.1], [0.5, 0.1, 0.2, 0.3]]),
                           b=(('y', 'x'), [[0.4, 0.3, 0.2, 0.4], [0.1, 0.2, 0.5, 0.1]],
                              dict(valid_pixel_expression='a >= 0.2')),
                           c=((), 1.0),
                           d=((), 1.0, dict(expression='a * b'))),
                      coords=dict(x=(('x',), [1, 2, 3, 4]), y=(('y',), [1, 2])),
                      attrs=dict(title='test_compute_dataset')).chunk(dict(x=2, y=2))