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Merged
merged 6 commits into from
Aug 5, 2025
Merged

Always return a real dtype from dpnp.linalg.cond #2547

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101365d
Always return a real dtype from dpnp.linalg.cond
antonwolfy Jul 31, 2025
e97a5d8
Update tests
antonwolfy Jul 31, 2025
a6f695a
Add PR to the changelog
antonwolfy Jul 31, 2025
1dd0469
Merge branch 'master' into correct-linalg-cond-dtype
antonwolfy Aug 4, 2025
58c7de5
Use generate_random_numpy_array in test_strided per review comment
antonwolfy Aug 4, 2025
f69b9d5
Pass seed value explicitly in test_strided
antonwolfy Aug 4, 2025
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -50,6 +50,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
* Avoided negating unsigned integers in ceil division used in `dpnp.resize` implementation [#2508](https://github.com/IntelPython/dpnp/pull/2508)
* Fixed `dpnp.unique` with 1d input array and `axis=0`, `equal_nan=True` keywords passed where the produced result doesn't collapse the NaNs [#2530](https://github.com/IntelPython/dpnp/pull/2530)
* Resolved issue when `dpnp.ndarray` constructor is called with `dpnp.ndarray.data` as `buffer` keyword [#2533](https://github.com/IntelPython/dpnp/pull/2533)
* Fixed `dpnp.linalg.cond` to always return a real dtype [#2547](https://github.com/IntelPython/dpnp/pull/2547)

### Security

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4 changes: 3 additions & 1 deletion dpnp/linalg/dpnp_utils_linalg.py
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Expand Up @@ -1976,13 +1976,15 @@ def dpnp_cond(x, p=None):
else:
r = s[..., 0] / s[..., -1]
else:
result_t = _common_type(x)
# The result array will contain nans in the entries
# where inversion failed
invx = dpnp.linalg.inv(x)
r = dpnp.linalg.norm(x, p, axis=(-2, -1)) * dpnp.linalg.norm(
invx, p, axis=(-2, -1)
)

# condition number is always real
result_t = _real_type(_common_type(x), device=x.sycl_queue)
r = r.astype(result_t, copy=False)

# Convert nans to infs unless the original array had nan entries
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36 changes: 17 additions & 19 deletions dpnp/tests/test_linalg.py
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Expand Up @@ -278,15 +278,15 @@ def test_cholesky_errors(self):


class TestCond:
_norms = [None, -dpnp.inf, -2, -1, 1, 2, dpnp.inf, "fro"]

def setup_method(self):
numpy.random.seed(70)

@pytest.mark.parametrize(
"shape", [(0, 4, 4), (4, 0, 3, 3)], ids=["(0, 5, 3)", "(4, 0, 2, 3)"]
)
@pytest.mark.parametrize(
"p", [None, -dpnp.inf, -2, -1, 1, 2, dpnp.inf, "fro"]
"shape", [(0, 4, 4), (4, 0, 3, 3)], ids=["(0, 4, 4)", "(4, 0, 3, 3)"]
)
@pytest.mark.parametrize("p", _norms)
def test_empty(self, shape, p):
a = numpy.empty(shape)
ia = dpnp.array(a)
Expand All @@ -295,26 +295,27 @@ def test_empty(self, shape, p):
expected = numpy.linalg.cond(a, p=p)
assert_dtype_allclose(result, expected)

# TODO: uncomment once numpy 2.3.3 release is published
# @testing.with_requires("numpy>=2.3.3")
@pytest.mark.parametrize(
"dtype", get_all_dtypes(no_none=True, no_bool=True)
)
@pytest.mark.parametrize(
"shape", [(4, 4), (2, 4, 3, 3)], ids=["(4, 4)", "(2, 4, 3, 3)"]
)
@pytest.mark.parametrize(
"p", [None, -dpnp.inf, -2, -1, 1, 2, dpnp.inf, "fro"]
)
@pytest.mark.parametrize("p", _norms)
def test_basic(self, dtype, shape, p):
a = generate_random_numpy_array(shape, dtype)
ia = dpnp.array(a)

result = dpnp.linalg.cond(ia, p=p)
expected = numpy.linalg.cond(a, p=p)
# TODO: remove when numpy#29333 is released
if numpy_version() < "2.3.3":
expected = expected.real
assert_dtype_allclose(result, expected, factor=16)

@pytest.mark.parametrize(
"p", [None, -dpnp.inf, -2, -1, 1, 2, dpnp.inf, "fro"]
)
@pytest.mark.parametrize("p", _norms)
def test_bool(self, p):
a = numpy.array([[True, True], [True, False]])
ia = dpnp.array(a)
Expand All @@ -323,9 +324,7 @@ def test_bool(self, p):
expected = numpy.linalg.cond(a, p=p)
assert_dtype_allclose(result, expected)

@pytest.mark.parametrize(
"p", [None, -dpnp.inf, -2, -1, 1, 2, dpnp.inf, "fro"]
)
@pytest.mark.parametrize("p", _norms)
def test_nan_to_inf(self, p):
a = numpy.zeros((2, 2))
ia = dpnp.array(a)
Expand All @@ -343,9 +342,7 @@ def test_nan_to_inf(self, p):
else:
assert_raises(dpnp.linalg.LinAlgError, dpnp.linalg.cond, ia, p=p)

@pytest.mark.parametrize(
"p", [None, -dpnp.inf, -2, -1, 1, 2, dpnp.inf, "fro"]
)
@pytest.mark.parametrize("p", _norms)
@pytest.mark.parametrize(
"stride",
[(-2, -3, 2, -2), (-2, 4, -4, -4), (2, 3, 4, 4), (-1, 3, 3, -3)],
Expand All @@ -367,11 +364,12 @@ def test_strided(self, p, stride):
expected = numpy.linalg.cond(a, p=p)
assert_dtype_allclose(result, expected, factor=24)

def test_error(self):
@pytest.mark.parametrize("xp", [dpnp, numpy])
def test_error(self, xp):
# cond is not defined on empty arrays
ia = dpnp.empty((2, 0))
a = xp.empty((2, 0))
with pytest.raises(ValueError):
dpnp.linalg.cond(ia, p=1)
xp.linalg.cond(a, p=1)


class TestDet:
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