>>> x = cp.arange(6, dtype='f').reshape(2, 3)
>>> y = cp.arange(3, dtype='f')
>>> kernel = cp.ElementwiseKernel(
... 'float32 x, float32 y', 'float32 z',
... '''if (x - 2 > y) {
... z = x * y;
... } else {
... z = x + y;
... }''', 'my_kernel')
>>> kernel(x, y)
array([[ 0., 2., 4.],
[ 0., 4., 10.]], dtype=float32)
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