Propagate input array's device in asarray

Author: betatim

array_api_strict/_creation_functions.py

@@ -67,6 +67,8 @@ def asarray(
     if dtype is not None:
         _np_dtype = dtype._np_dtype
     _check_device(device)
+    if isinstance(obj, Array) and device is None:
+        device = obj.device
 
     if np.__version__[0] < '2':
         if copy is False:
@@ -158,6 +160,8 @@ def empty_like(
 
     _check_valid_dtype(dtype)
     _check_device(device)
+    if device is None:
+        device = x.device
 
     if dtype is not None:
         dtype = dtype._np_dtype
@@ -260,6 +264,8 @@ def full_like(
 
     _check_valid_dtype(dtype)
     _check_device(device)
+    if device is None:
+        device = x.device
 
     if dtype is not None:
         dtype = dtype._np_dtype

array_api_strict/tests/test_creation_functions.py

@@ -23,7 +23,7 @@
     zeros_like,
 )
 from .._dtypes import float32, float64
-from .._array_object import Array, CPU_DEVICE
+from .._array_object import Array, CPU_DEVICE, Device
 from .._flags import set_array_api_strict_flags
 
 def test_asarray_errors():
@@ -97,6 +97,17 @@ def test_asarray_copy():
     a[0] = 0
     assert all(b[0] == 0)
 
+
+def test_asarray_device_inference():
+    assert asarray([1, 2, 3]).device == CPU_DEVICE
+
+    x = asarray([1, 2, 3])
+    assert asarray(x).device == CPU_DEVICE
+
+    device1 = Device("device1")
+    x = asarray([1, 2, 3], device=device1)
+    assert asarray(x).device == device1
+
 def test_arange_errors():
     arange(1, device=CPU_DEVICE)  # Doesn't error
     assert_raises(ValueError, lambda: arange(1, device="cpu"))