Implement dpnp.cumprod through dpctl.tensor (#1811)

Co-authored-by: vtavana <120411540+vtavana@users.noreply.github.com>

Author: antonwolfy

dpnp/dpnp_algo/dpnp_algo_mathematical.pxi

@@ -36,7 +36,6 @@ and the rest of the library
 # NO IMPORTs here. All imports must be placed into main "dpnp_algo.pyx" file
 
 __all__ += [
-    "dpnp_cumprod",
     "dpnp_ediff1d",
     "dpnp_fabs",
     "dpnp_fmod",

dpnp/dpnp_array.py

@@ -721,7 +721,16 @@ def copy(self, order="C"):
         return dpnp.copy(self, order=order)
 
     # 'ctypes',
-    # 'cumprod',
+
+    def cumprod(self, axis=None, dtype=None, out=None):
+        """
+        Return the cumulative product of the elements along the given axis.
+
+        Refer to :obj:`dpnp.cumprod` for full documentation.
+
+        """
+
+        return dpnp.cumprod(self, axis=axis, dtype=dtype, out=out)
 
     def cumsum(self, axis=None, dtype=None, out=None):
         """

dpnp/dpnp_iface_mathematical.py

@@ -58,7 +58,6 @@
 
 from .backend.extensions.sycl_ext import _sycl_ext_impl
 from .dpnp_algo import (
-    dpnp_cumprod,
     dpnp_ediff1d,
     dpnp_fabs,
     dpnp_fmax,
@@ -806,38 +805,85 @@ def cross(a, b, axisa=-1, axisb=-1, axisc=-1, axis=None):
     return dpnp.moveaxis(cp, -1, axisc)
 
 
-def cumprod(x1, **kwargs):
+def cumprod(a, axis=None, dtype=None, out=None):
     """
     Return the cumulative product of elements along a given axis.
 
     For full documentation refer to :obj:`numpy.cumprod`.
 
-    Limitations
-    -----------
-    Parameter `x` is supported as :class:`dpnp.ndarray`.
-    Keyword argument `kwargs` is currently unsupported.
-    Otherwise the function will be executed sequentially on CPU.
-    Input array data types are limited by supported DPNP :ref:`Data types`.
+    Parameters
+    ----------
+    a : {dpnp.ndarray, usm_ndarray}
+        Input array.
+    axis : {None, int}, optional
+        Axis along which the cumulative product is computed. It defaults to
+        compute the cumulative product over the flattened array.
+        Default: ``None``.
+    dtype : {None, dtype}, optional
+        Type of the returned array and of the accumulator in which the elements
+        are multiplied. If `dtype` is not specified, it defaults to the dtype
+        of `a`, unless `a` has an integer dtype with a precision less than that
+        of the default platform integer. In that case, the default platform
+        integer is used.
+        Default: ``None``.
+    out : {None, dpnp.ndarray, usm_ndarray}, optional
+        Alternative output array in which to place the result. It must have the
+        same shape and buffer length as the expected output but the type will
+        be cast if necessary.
+        Default: ``None``.
+
+    Returns
+    -------
+    out : dpnp.ndarray
+        A new array holding the result is returned unless `out` is specified as
+        :class:`dpnp.ndarray`, in which case a reference to `out` is returned.
+        The result has the same size as `a`, and the same shape as `a` if `axis`
+        is not ``None`` or `a` is a 1-d array.
+
+    See Also
+    --------
+    :obj:`dpnp.prod` : Product array elements.
 
     Examples
     --------
     >>> import dpnp as np
     >>> a = np.array([1, 2, 3])
-    >>> result = np.cumprod(a)
-    >>> [x for x in result]
-    [1, 2, 6]
-    >>> b = np.array([[1, 2, 3], [4, 5, 6]])
-    >>> result = np.cumprod(b)
-    >>> [x for x in result]
-    [1, 2, 6, 24, 120, 720]
+    >>> np.cumprod(a) # intermediate results 1, 1*2
+    ...               # total product 1*2*3 = 6
+    array([1, 2, 6])
+    >>> a = np.array([[1, 2, 3], [4, 5, 6]])
+    >>> np.cumprod(a, dtype=np.float32) # specify type of output
+    array([  1.,   2.,   6.,  24., 120., 720.], dtype=float32)
+
+    The cumulative product for each column (i.e., over the rows) of `a`:
+
+    >>> np.cumprod(a, axis=0)
+    array([[ 1,  2,  3],
+           [ 4, 10, 18]])
+
+    The cumulative product for each row (i.e. over the columns) of `a`:
+
+    >>> np.cumprod(a, axis=1)
+    array([[  1,   2,   6],
+           [  4,  20, 120]])
 
     """
 
-    x1_desc = dpnp.get_dpnp_descriptor(x1, copy_when_nondefault_queue=False)
-    if x1_desc and not kwargs:
-        return dpnp_cumprod(x1_desc).get_pyobj()
+    dpnp.check_supported_arrays_type(a)
+    if a.ndim > 1 and axis is None:
+        usm_a = dpnp.ravel(a).get_array()
+    else:
+        usm_a = dpnp.get_usm_ndarray(a)
 
-    return call_origin(numpy.cumprod, x1, **kwargs)
+    return dpnp_wrap_reduction_call(
+        a,
+        out,
+        dpt.cumulative_prod,
+        _get_reduction_res_dt,
+        usm_a,
+        axis=axis,
+        dtype=dtype,
+    )
 
 
 def cumsum(a, axis=None, dtype=None, out=None):

dpnp/dpnp_iface_nanfunctions.py

@@ -265,8 +265,8 @@ def nancumprod(x1, **kwargs):
 
     See Also
     --------
-    :obj:`dpnp.cumprod` : Return the cumulative product of elements
-                          along a given axis.
+    :obj:`dpnp.cumprod` : Cumulative product across array propagating NaNs.
+    :obj:`dpnp.isnan` : Show which elements are NaN.
 
     Examples
     --------

tests/test_mathematical.py

@@ -161,6 +161,75 @@ def test_not_implemented_kwargs(self, kwargs):
             dpnp.clip(a, 1, 5, **kwargs)
 
 
+class TestCumProd:
+    @pytest.mark.parametrize(
+        "arr, axis",
+        [
+            pytest.param([1, 2, 10, 11, 6, 5, 4], -1),
+            pytest.param([[1, 2, 3, 4], [5, 6, 7, 9], [10, 3, 4, 5]], 0),
+            pytest.param([[1, 2, 3, 4], [5, 6, 7, 9], [10, 3, 4, 5]], -1),
+        ],
+    )
+    @pytest.mark.parametrize("dtype", get_all_dtypes())
+    def test_axis(self, arr, axis, dtype):
+        a = numpy.array(arr, dtype=dtype)
+        ia = dpnp.array(a)
+
+        result = dpnp.cumprod(ia, axis=axis)
+        expected = numpy.cumprod(a, axis=axis)
+        assert_array_equal(expected, result)
+
+    @pytest.mark.parametrize("dtype", get_all_dtypes())
+    def test_ndarray_method(self, dtype):
+        a = numpy.arange(1, 10).astype(dtype=dtype)
+        ia = dpnp.array(a)
+
+        result = ia.cumprod()
+        expected = a.cumprod()
+        assert_array_equal(expected, result)
+
+    @pytest.mark.parametrize("sh", [(10,), (2, 5)])
+    @pytest.mark.parametrize(
+        "xp_in, xp_out, check",
+        [
+            pytest.param(dpt, dpt, False),
+            pytest.param(dpt, dpnp, True),
+            pytest.param(dpnp, dpt, False),
+        ],
+    )
+    def test_usm_ndarray(self, sh, xp_in, xp_out, check):
+        a = numpy.arange(-12, -2).reshape(sh)
+        ia = xp_in.asarray(a)
+
+        result = dpnp.cumprod(ia)
+        expected = numpy.cumprod(a)
+        assert_array_equal(expected, result)
+
+        out = numpy.empty((10,))
+        iout = xp_out.asarray(out)
+
+        result = dpnp.cumprod(ia, out=iout)
+        expected = numpy.cumprod(a, out=out)
+        assert_array_equal(expected, result)
+        assert (result is iout) is check
+
+    @pytest.mark.usefixtures("suppress_complex_warning")
+    @pytest.mark.parametrize("arr_dt", get_all_dtypes(no_none=True))
+    @pytest.mark.parametrize("out_dt", get_all_dtypes(no_none=True))
+    @pytest.mark.parametrize("dtype", get_all_dtypes())
+    def test_out_dtype(self, arr_dt, out_dt, dtype):
+        a = numpy.arange(5, 10).astype(dtype=arr_dt)
+        out = numpy.zeros_like(a, dtype=out_dt)
+
+        ia = dpnp.array(a)
+        iout = dpnp.array(out)
+
+        result = ia.cumprod(out=iout, dtype=dtype)
+        expected = a.cumprod(out=out, dtype=dtype)
+        assert_array_equal(expected, result)
+        assert result is iout
+
+
 class TestCumSum:
     @pytest.mark.parametrize(
         "arr, axis",

tests/test_sycl_queue.py

@@ -417,7 +417,7 @@ def test_meshgrid(device_x, device_y):
         ),
         pytest.param("cosh", [-5.0, -3.5, 0.0, 3.5, 5.0]),
         pytest.param("count_nonzero", [3, 0, 2, -1.2]),
-        pytest.param("cumprod", [[1.0, 2.0, 3.0], [4.0, 5.0, 6.0]]),
+        pytest.param("cumprod", [[1, 2, 3], [4, 5, 6]]),
         pytest.param("cumsum", [[1, 2, 3], [4, 5, 6]]),
         pytest.param("diff", [1.0, 2.0, 4.0, 7.0, 0.0]),
         pytest.param("ediff1d", [1.0, 2.0, 4.0, 7.0, 0.0]),

tests/test_usm_type.py

@@ -522,6 +522,7 @@ def test_norm(usm_type, ord, axis):
         ),
         pytest.param("cosh", [-5.0, -3.5, 0.0, 3.5, 5.0]),
         pytest.param("count_nonzero", [0, 1, 7, 0]),
+        pytest.param("cumprod", [[1, 2, 3], [4, 5, 6]]),
         pytest.param("cumsum", [[1, 2, 3], [4, 5, 6]]),
         pytest.param("diff", [1.0, 2.0, 4.0, 7.0, 0.0]),
         pytest.param("exp", [1.0, 2.0, 4.0, 7.0]),

tests/third_party/cupy/math_tests/test_sumprod.py

@@ -483,13 +483,11 @@ def _cumprod(self, xp, a, *args, **kwargs):
         return res
 
     @testing.for_all_dtypes()
-    # TODO: remove type_check once proper cumprod is implemented
-    @testing.numpy_cupy_allclose(type_check=(not is_win_platform()))
+    @testing.numpy_cupy_allclose()
     def test_cumprod_1dim(self, xp, dtype):
         a = testing.shaped_arange((5,), xp, dtype)
         return self._cumprod(xp, a)
 
-    @pytest.mark.usefixtures("allow_fall_back_on_numpy")
     @testing.for_all_dtypes()
     @testing.numpy_cupy_allclose()
     def test_cumprod_out(self, xp, dtype):
@@ -498,7 +496,6 @@ def test_cumprod_out(self, xp, dtype):
         self._cumprod(xp, a, out=out)
         return out
 
-    @pytest.mark.usefixtures("allow_fall_back_on_numpy")
     @testing.for_all_dtypes()
     @testing.numpy_cupy_allclose()
     def test_cumprod_out_noncontiguous(self, xp, dtype):
@@ -507,24 +504,18 @@ def test_cumprod_out_noncontiguous(self, xp, dtype):
         self._cumprod(xp, a, out=out)
         return out
 
-    # TODO: remove skip once proper cumprod is implemented
-    @pytest.mark.skipif(
-        is_win_platform(), reason="numpy has another default integral dtype"
-    )
     @testing.for_all_dtypes()
     @testing.numpy_cupy_allclose(rtol=1e-6)
     def test_cumprod_2dim_without_axis(self, xp, dtype):
         a = testing.shaped_arange((4, 5), xp, dtype)
         return self._cumprod(xp, a)
 
-    @pytest.mark.usefixtures("allow_fall_back_on_numpy")
     @testing.for_all_dtypes()
     @testing.numpy_cupy_allclose()
     def test_cumprod_2dim_with_axis(self, xp, dtype):
         a = testing.shaped_arange((4, 5), xp, dtype)
         return self._cumprod(xp, a, axis=1)
 
-    @pytest.mark.skip("ndarray.cumprod() is not implemented yet")
     @testing.for_all_dtypes()
     @testing.numpy_cupy_allclose()
     def test_ndarray_cumprod_2dim_with_axis(self, xp, dtype):
@@ -535,53 +526,44 @@ def test_ndarray_cumprod_2dim_with_axis(self, xp, dtype):
     @testing.slow
     def test_cumprod_huge_array(self):
         size = 2**32
-        # Free huge memory for slow test
-        cupy.get_default_memory_pool().free_all_blocks()
-        a = cupy.ones(size, "b")
+        a = cupy.ones(size, dtype="b")
         result = cupy.cumprod(a, dtype="b")
         del a
         assert (result == 1).all()
         # Free huge memory for slow test
         del result
-        cupy.get_default_memory_pool().free_all_blocks()
 
-    @pytest.mark.usefixtures("allow_fall_back_on_numpy")
     @testing.for_all_dtypes()
     def test_invalid_axis_lower1(self, dtype):
         for xp in (numpy, cupy):
             a = testing.shaped_arange((4, 5), xp, dtype)
             with pytest.raises(numpy.AxisError):
                 xp.cumprod(a, axis=-a.ndim - 1)
 
-    @pytest.mark.usefixtures("allow_fall_back_on_numpy")
     @testing.for_all_dtypes()
     def test_invalid_axis_lower2(self, dtype):
         for xp in (numpy, cupy):
             a = testing.shaped_arange((4, 5), xp, dtype)
             with pytest.raises(numpy.AxisError):
                 xp.cumprod(a, axis=-a.ndim - 1)
 
-    @pytest.mark.usefixtures("allow_fall_back_on_numpy")
     @testing.for_all_dtypes()
     def test_invalid_axis_upper1(self, dtype):
         for xp in (numpy, cupy):
             a = testing.shaped_arange((4, 5), xp, dtype)
             with pytest.raises(numpy.AxisError):
                 return xp.cumprod(a, axis=a.ndim)
 
-    @pytest.mark.usefixtures("allow_fall_back_on_numpy")
     @testing.for_all_dtypes()
     def test_invalid_axis_upper2(self, dtype):
         a = testing.shaped_arange((4, 5), cupy, dtype)
         with pytest.raises(numpy.AxisError):
             return cupy.cumprod(a, axis=a.ndim)
 
-    @pytest.mark.skip("no exception is raised by numpy")
     def test_cumprod_arraylike(self):
         with pytest.raises(TypeError):
             return cupy.cumprod((1, 2, 3))
 
-    @pytest.mark.skip("no exception is raised by numpy")
     @testing.for_float_dtypes()
     def test_cumprod_numpy_array(self, dtype):
         a_numpy = numpy.arange(1, 6, dtype=dtype)