Merge pull request #211 from ev-br/asarray_copy_dask

BUG: dask.array: asarray(..., copy=None) copies in dask==2024.12

Author: ev-br

array_api_compat/dask/array/_aliases.py

@@ -140,7 +140,9 @@ def asarray(
         return da.array(obj, dtype=dtype)
     else:
         if not isinstance(obj, da.Array) or dtype is not None and obj.dtype != dtype:
-            obj = np.asarray(obj, dtype=dtype)
+            # copy=True to be uniform across dask < 2024.12 and >= 2024.12
+            # see https://github.com/dask/dask/pull/11524/
+            obj = np.array(obj, dtype=dtype, copy=True)
             return da.from_array(obj)
         return obj
 

dask-skips.txt

@@ -1,2 +1,5 @@
 # slow and not implemented in dask
 array_api_tests/test_linalg.py::test_matrix_power
+
+# hangs on 2024.12
+array_api_tests/test_creation_functions.py::test_eye

tests/test_common.py

@@ -204,8 +204,11 @@ def test_asarray_copy(library):
     b = asarray(a, copy=None)
     assert is_lib_func(b)
     a[0] = 0.0
-    if library == 'cupy':
+    if library in ('cupy', 'dask.array'):
         # A copy is required for libraries where the default device is not CPU
+        # dask changed behaviour of copy=None in 2024.12 to copy;
+        # this wrapper ensures the same behaviour in older versions too.
+        # https://github.com/dask/dask/pull/11524/
         assert all(b[0] == 1.0)
     else:
         assert all(b[0] == 0.0)