Use linspace() function from dpctl.tensor.

dpnp/dpnp_algo/dpnp_algo.pyx

@@ -48,6 +48,8 @@ cimport dpnp.dpnp_utils as utils
 cimport numpy
 import numpy
 
+import operator
+
 
 __all__ = [
     "dpnp_astype",

dpnp/dpnp_algo/dpnp_algo_arraycreation.pyx

@@ -189,31 +189,81 @@ cpdef utils.dpnp_descriptor dpnp_identity(n, result_dtype):
     return result
 
 
-# TODO this function should work through dpnp_arange_c
-cpdef tuple dpnp_linspace(start, stop, num, endpoint, retstep, dtype, axis):
-    cdef shape_type_c obj_shape = utils._object_to_tuple(num)
-    cdef utils.dpnp_descriptor result = utils_py.create_output_descriptor_py(obj_shape, dtype, None)
+def dpnp_linspace(start, stop, num, dtype=None, device=None, usm_type=None, sycl_queue=None, endpoint=True, retstep=False, axis=0):
+    usm_type_alloc, sycl_queue_alloc = utils_py.get_usm_allocations([start, stop])
 
-    if endpoint:
-        steps_count = num - 1
-    else:
-        steps_count = num
+    # Get sycl_queue.
+    if sycl_queue is None and device is None:
+        sycl_queue = sycl_queue_alloc
+    sycl_queue_normalized = dpnp.get_normalized_queue_device(sycl_queue=sycl_queue, device=device)
 
-    # if there are steps, then fill values
-    if steps_count > 0:
-        step = (dpnp.float64(stop) - start) / steps_count
-        for i in range(1, result.size):
-            result.get_pyobj()[i] = start + step * i
+    # Get temporary usm_type for getting dtype.
+    if usm_type is None:
+        _usm_type = "device" if usm_type_alloc is None else usm_type_alloc
     else:
-        step = dpnp.nan
+        _usm_type = usm_type
+
+    # Get dtype.
+    if not hasattr(start, "dtype") and not dpnp.isscalar(start):
+        start = dpnp.asarray(start, usm_type=_usm_type, sycl_queue=sycl_queue_normalized)
+    if not hasattr(stop, "dtype") and not dpnp.isscalar(stop):
+        stop = dpnp.asarray(stop, usm_type=_usm_type, sycl_queue=sycl_queue_normalized)
+    dt = numpy.result_type(start, stop, float(num))
+    dt = utils_py.map_dtype_to_device(dt, sycl_queue_normalized.sycl_device)
+    if dtype is None:
+        dtype = dt
+
+    if dpnp.isscalar(start) and dpnp.isscalar(stop):
+        # Call linspace() function for scalars.
+        res = dpnp_container.linspace(start,
+                                      stop,
+                                      num,
+                                      dtype=dt,
+                                      usm_type=_usm_type,
+                                      sycl_queue=sycl_queue_normalized,
+                                      endpoint=endpoint)
+    else:
+        num = operator.index(num)
+        if num < 0:
+            raise ValueError("Number of points must be non-negative")
+
+        # Get final usm_type and copy arrays if needed with current dtype, usm_type and sycl_queue.
+        # Do not need to copy usm_ndarray by usm_type if it is not explicitly stated.
+        if usm_type is None:
+            usm_type = _usm_type
+            if not hasattr(start, "usm_type"):
+                _start = dpnp.asarray(start, dtype=dt, usm_type=usm_type, sycl_queue=sycl_queue_normalized)
+            else:
+                _start = dpnp.asarray(start, dtype=dt, sycl_queue=sycl_queue_normalized)
+            if not hasattr(stop, "usm_type"):
+                _stop = dpnp.asarray(stop, dtype=dt, usm_type=usm_type, sycl_queue=sycl_queue_normalized)
+            else:
+                _stop = dpnp.asarray(stop, dtype=dt, sycl_queue=sycl_queue_normalized)
+        else:
+            _start = dpnp.asarray(start, dtype=dt, usm_type=usm_type, sycl_queue=sycl_queue_normalized)
+            _stop = dpnp.asarray(stop, dtype=dt, usm_type=usm_type, sycl_queue=sycl_queue_normalized)
 
-    # if result is not empty, then fiil first and last elements
-    if num > 0:
-        result.get_pyobj()[0] = start
-        if endpoint and result.size > 1:
-            result.get_pyobj()[result.size - 1] = stop
+        # FIXME: issue #1304. Mathematical operations with scalar don't follow data type.
+        _num = dpnp.asarray((num - 1) if endpoint else num, dtype=dt, usm_type=usm_type, sycl_queue=sycl_queue_normalized)
+
+        step = (_stop - _start) / _num
+
+        res = dpnp_container.arange(0,
+                                    stop=num,
+                                    step=1,
+                                    dtype=dt,
+                                    usm_type=usm_type,
+                                    sycl_queue=sycl_queue_normalized)
+
+        res = res.reshape((-1,) + (1,) * step.ndim)
+        res = res * step + _start
+
+        if endpoint and num > 1:
+            res[-1] = dpnp_container.full(step.shape, _stop)
 
-    return (result.get_pyobj(), step)
+    if numpy.issubdtype(dtype, dpnp.integer):
+        dpnp.floor(res, out=res)
+    return res.astype(dtype)
 
 
 cpdef utils.dpnp_descriptor dpnp_logspace(start, stop, num, endpoint, base, dtype, axis):

dpnp/dpnp_container.py

@@ -47,6 +47,7 @@
     "empty",
     "eye",
     "full",
+    "linspace",
     "ones"
     "tril",
     "triu",
@@ -126,6 +127,33 @@ def empty(shape,
     return dpnp_array(array_obj.shape, buffer=array_obj, order=order)
 
 
+def eye(N,
+        M=None,
+        /,
+        *,
+        k=0,
+        dtype=None,
+        order="C",
+        device=None,
+        usm_type="device",
+        sycl_queue=None):
+    """Validate input parameters before passing them into `dpctl.tensor` module"""
+    dpu.validate_usm_type(usm_type, allow_none=False)
+    sycl_queue_normalized = dpnp.get_normalized_queue_device(sycl_queue=sycl_queue, device=device)
+    if order is None:
+        order = 'C'
+
+    """Creates `dpnp_array` with ones on the `k`th diagonal."""
+    array_obj = dpt.eye(N,
+                        M,
+                        k=k,
+                        dtype=dtype,
+                        order=order,
+                        usm_type=usm_type,
+                        sycl_queue=sycl_queue_normalized)
+    return dpnp_array(array_obj.shape, buffer=array_obj, order=order)
+
+
 def full(shape,
          fill_value,
          *,
@@ -153,31 +181,29 @@ def full(shape,
     return dpnp_array(array_obj.shape, buffer=array_obj, order=order)
 
 
-def eye(N,
-        M=None,
-        /,
-        *,
-        k=0,
-        dtype=None,
-        order="C",
-        device=None,
-        usm_type="device",
-        sycl_queue=None):
+def linspace(start,
+             stop,
+             /,
+             num,
+             *,
+             dtype=None,
+             device=None,
+             usm_type="device",
+             sycl_queue=None,
+             endpoint=True):
     """Validate input parameters before passing them into `dpctl.tensor` module"""
     dpu.validate_usm_type(usm_type, allow_none=False)
     sycl_queue_normalized = dpnp.get_normalized_queue_device(sycl_queue=sycl_queue, device=device)
-    if order is None:
-        order = 'C'
 
-    """Creates `dpnp_array` with ones on the `k`th diagonal."""
-    array_obj = dpt.eye(N,
-                        M,
-                        k=k,
-                        dtype=dtype,
-                        order=order,
-                        usm_type=usm_type,
-                        sycl_queue=sycl_queue_normalized)
-    return dpnp_array(array_obj.shape, buffer=array_obj, order=order)
+    """Creates `dpnp_array` with evenly spaced numbers of specified interval."""
+    array_obj = dpt.linspace(start,
+                             stop,
+                             num,
+                             dtype=dtype,
+                             usm_type=usm_type,
+                             sycl_queue=sycl_queue_normalized,
+                             endpoint=endpoint)
+    return dpnp_array(array_obj.shape, buffer=array_obj)
 
 
 def meshgrid(*xi, indexing="xy"):

dpnp/dpnp_iface_arraycreation.py

@@ -50,6 +50,7 @@
 
 import dpnp.dpnp_container as dpnp_container
 import dpctl.tensor as dpt
+import dpctl
 
 
 __all__ = [
@@ -879,7 +880,18 @@ def identity(n, dtype=None, *, like=None):
     return call_origin(numpy.identity, n, dtype=dtype, like=like)
 
 
-def linspace(start, stop, num=50, endpoint=True, retstep=False, dtype=None, axis=0):
+def linspace(start,
+             stop,
+             /,
+             num,
+             *,
+             dtype=None,
+             device=None,
+             usm_type=None,
+             sycl_queue=None,
+             endpoint=True,
+             retstep=False,
+             axis=0):
     """
     Return evenly spaced numbers over a specified interval.
 
@@ -888,6 +900,8 @@ def linspace(start, stop, num=50, endpoint=True, retstep=False, dtype=None, axis
     Limitations
     -----------
     Parameter ``axis`` is supported only with default value ``0``.
+    Parameter ``retstep`` is supported only with default value ``False``.
+    Otherwise the function will be executed sequentially on CPU.
 
     See Also
     --------
@@ -913,16 +927,19 @@ def linspace(start, stop, num=50, endpoint=True, retstep=False, dtype=None, axis
 
     """
 
-    if not use_origin_backend():
-        if axis != 0:
-            checker_throw_value_error("linspace", "axis", axis, 0)
-
-        res = dpnp_linspace(start, stop, num, endpoint, retstep, dtype, axis)
-
-        if retstep:
-            return res
-        else:
-            return res[0]
+    if retstep is not False:
+        pass
+    elif axis != 0:
+        pass
+    else:
+        return dpnp_linspace(start,
+                             stop,
+                             num,
+                             dtype=dtype,
+                             device=device,
+                             usm_type=usm_type,
+                             sycl_queue=sycl_queue,
+                             endpoint=endpoint)
 
     return call_origin(numpy.linspace, start, stop, num, endpoint, retstep, dtype, axis)
 

tests/skipped_tests.tbl

@@ -418,12 +418,10 @@ tests/third_party/cupy/creation_tests/test_ranges.py::TestMgrid::test_mgrid3
 tests/third_party/cupy/creation_tests/test_ranges.py::TestOgrid::test_ogrid3
 tests/third_party/cupy/creation_tests/test_ranges.py::TestOgrid::test_ogrid4
 tests/third_party/cupy/creation_tests/test_ranges.py::TestOgrid::test_ogrid5
-tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_array_start_stop
 tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_array_start_stop_axis1
-tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_float_underflow
-tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_mixed_start_stop
-tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_mixed_start_stop2
-tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_start_stop_list
+tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_one_num_no_endopoint_with_retstep
+tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_with_retstep
+tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_zero_num_no_endopoint_with_retstep
 tests/third_party/cupy/indexing_tests/test_generate.py::TestAxisConcatenator::test_AxisConcatenator_init1
 tests/third_party/cupy/indexing_tests/test_generate.py::TestAxisConcatenator::test_len
 tests/third_party/cupy/indexing_tests/test_generate.py::TestC_::test_c_1

tests/skipped_tests_gpu.tbl

@@ -594,19 +594,13 @@ tests/third_party/cupy/creation_tests/test_ranges.py::TestMgrid::test_mgrid5
 tests/third_party/cupy/creation_tests/test_ranges.py::TestOgrid::test_ogrid3
 tests/third_party/cupy/creation_tests/test_ranges.py::TestOgrid::test_ogrid4
 tests/third_party/cupy/creation_tests/test_ranges.py::TestOgrid::test_ogrid5
-
-tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_array_start_stop
-tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_array_start_stop_axis1
 tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_arange_negative_size
 tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_arange_no_dtype_int
-
-tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_float_underflow
-tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_mixed_start_stop
-tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_mixed_start_stop2
-tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_start_stop_list
-
+tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_array_start_stop_axis1
+tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_one_num_no_endopoint_with_retstep
+tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_with_retstep
+tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_linspace_zero_num_no_endopoint_with_retstep
 tests/third_party/cupy/creation_tests/test_ranges.py::TestRanges::test_logspace_zero_num
-
 tests/third_party/cupy/fft_tests/test_fft.py::TestFft2_param_1_{axes=None, norm=None, s=(1, None), shape=(3, 4)}::test_fft2
 tests/third_party/cupy/fft_tests/test_fft.py::TestFft2_param_7_{axes=(), norm=None, s=None, shape=(3, 4)}::test_fft2
 tests/third_party/cupy/fft_tests/test_fft.py::TestFft2_param_7_{axes=(), norm=None, s=None, shape=(3, 4)}::test_ifft2

tests/test_arraycreation.py

@@ -513,6 +513,51 @@ def test_dpctl_tensor_input(func, args):
         assert_array_equal(X, Y)
 
 
+@pytest.mark.parametrize("start",
+                         [0, -5, 10, -2.5, 9.7],
+                         ids=['0', '-5', '10', '-2.5', '9.7'])
+@pytest.mark.parametrize("stop",
+                         [0, 10, -2, 20.5, 1000],
+                         ids=['0', '10', '-2', '20.5', '1000'])
+@pytest.mark.parametrize("num",
+                         [5, numpy.array(10), dpnp.array(17), dpt.asarray(100)],
+                         ids=['5', 'numpy.array(10)', 'dpnp.array(17)', 'dpt.asarray(100)'])
+@pytest.mark.parametrize("dtype", get_all_dtypes(no_bool=True, no_float16=False))
+def test_linspace(start, stop, num, dtype):
+    func = lambda xp: xp.linspace(start, stop, num, dtype=dtype)
+
+    if numpy.issubdtype(dtype, dpnp.integer):
+        assert_allclose(func(numpy), func(dpnp), rtol=1)
+    else:
+        assert_allclose(func(numpy), func(dpnp), atol=numpy.finfo(dtype).eps)
+
+
+@pytest.mark.parametrize("start_dtype",
+                         [numpy.float64, numpy.float32, numpy.int64, numpy.int32],
+                         ids=['float64', 'float32', 'int64', 'int32'])
+@pytest.mark.parametrize("stop_dtype",
+                         [numpy.float64, numpy.float32, numpy.int64, numpy.int32],
+                         ids=['float64', 'float32', 'int64', 'int32'])
+def test_linspace_dtype(start_dtype, stop_dtype):
+    start = numpy.array([1, 2, 3], dtype=start_dtype)
+    stop = numpy.array([11, 7, -2], dtype=stop_dtype)
+    dpnp.linspace(start, stop, 10)
+
+
+@pytest.mark.parametrize("start",
+                         [dpnp.array(1), dpnp.array([2.6]), numpy.array([[-6.7, 3]]), [1, -4], (3, 5)])
+@pytest.mark.parametrize("stop",
+                         [dpnp.array([-4]), dpnp.array([[2.6], [- 4]]), numpy.array(2), [[-4.6]], (3,)])
+def test_linspace_arrays(start, stop):
+    func = lambda xp: xp.linspace(start, stop, 10)
+    assert func(numpy).shape == func(dpnp).shape
+
+
+def test_linspace_complex():
+    func = lambda xp: xp.linspace(0, 3 + 2j, num=1000)
+    assert_allclose(func(numpy), func(dpnp))
+
+
 @pytest.mark.parametrize("arrays",
                          [[], [[1]], [[1, 2, 3], [4, 5, 6]], [[1, 2], [3, 4], [5, 6]]],
                          ids=['[]', '[[1]]', '[[1, 2, 3], [4, 5, 6]]', '[[1, 2], [3, 4], [5, 6]]'])

tests/test_special.py

@@ -7,7 +7,7 @@ def test_erf():
     a = numpy.linspace(2.0, 3.0, num=10)
     ia = dpnp.linspace(2.0, 3.0, num=10)
 
-    numpy.testing.assert_array_equal(a, ia)
+    numpy.testing.assert_allclose(a, ia)
 
     expected = numpy.empty_like(a)
     for idx, val in enumerate(a):