Ensures that the XPU cache is cleared before creating tensors during the test. (#1892)

Ensures that the XPU cache is cleared before creating large tensors
during the test.

Author: chunhuanMeng

test/regressions/test_tril.py

@@ -7,6 +7,7 @@ class TestSimpleBinary(TestCase):
     def test_tril(self, dtype=torch.bool):
         max_seq_length = 131072
         with torch.device("xpu"):
+            torch.xpu.empty_cache()
             a = torch.ones(max_seq_length, max_seq_length, dtype=torch.bool)
             causal_mask = torch.tril(a)
         torch.xpu.synchronize()