fix test-einsum-v2 unittest in cuda 11.7 (#44772)

python/paddle/fluid/tests/unittests/test_einsum_v2.py

@@ -17,6 +17,7 @@ import contextlib
 import unittest
 import paddle
 from paddle.fluid import core
+from paddle.fluid.dygraph.amp.auto_cast import _is_gpu_bfloat16_supported
 
 import os
 
@@ -529,16 +530,15 @@ class TestBF16(unittest.TestCase):
     """
 
     def test_shape(self):
-        cuda_major = paddle.version.cuda().split('.')[0].strip()
-        if paddle.is_compiled_with_cuda() and int(cuda_major) >= 11:
-            """ MatmulKernel support bfloat16 only if cuda_major > 11.0.
+        if paddle.is_compiled_with_cuda() and _is_gpu_bfloat16_supported():
+            """ MatmulKernel support bfloat16 only if cuda_major >= 11.0 and Compute Capability >= 8.0
             """
             A = paddle.to_tensor(np.array([1.0, 2.0])).astype(paddle.bfloat16)
             A = A.cuda()
             B = paddle.to_tensor(np.array([2.0, 3.0])).astype(paddle.bfloat16)
             B = B.cuda()
             C = paddle.einsum('i,i->', A, B)
-            self.assertEqual(C.item(), 8.0)
+            self.assertEqual(C.astype(paddle.float32).item(), 8.0)
 
 
 class TestComplex(unittest.TestCase):