Make dpctl tensor device hashable, added equality comparison

dpctl/tensor/_device.py

@@ -124,6 +124,18 @@ def wait(self):
         """
         self.sycl_queue_.wait()
 
+    def __eq__(self, other):
+        """Equality comparison based on underlying ``sycl_queue``."""
+        if isinstance(other, Device):
+            return self.sycl_queue.__eq__(other.sycl_queue)
+        elif isinstance(other, dpctl.SyclQueue):
+            return self.sycl_queue.__eq__(other)
+        return False
+
+    def __hash__(self):
+        """Compute object's hash value."""
+        return self.sycl_queue.__hash__()
+
 
 def normalize_queue_device(sycl_queue=None, device=None):
     """

dpctl/tests/test_usm_ndarray_ctor.py

@@ -1575,3 +1575,19 @@ def test_asarray_uint64():
     Xnp = np.ndarray(1, dtype=np.uint64)
     X = dpt.asarray(Xnp)
     assert X.dtype == Xnp.dtype
+
+
+def test_Device():
+    try:
+        dev = dpctl.select_default_device()
+        d1 = dpt.Device.create_device(dev)
+        d2 = dpt.Device.create_device(dev)
+    except (dpctl.SyclQueueCreationError, dpctl.SyclDeviceCreationError):
+        pytest.skip(
+            "Could not create default device, or a queue that targets it"
+        )
+    assert d1 == d2
+    dict = {d1: 1}
+    assert dict[d2] == 1
+    assert d1 == d2.sycl_queue
+    assert not d1 == Ellipsis