dpctl.tensor.Device.__eq__ and .__hash__ special methods added.

Array API's Device object must support __eq__ special method.
Addition of __hash__ also allows to use Device object instances
as keys in dictionaries.

Author: oleksandr-pavlyk

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):
     """