fix tests

Author: zou3519

test/test_ops.py

@@ -1117,11 +1117,9 @@ def test_vjpvmap(self, device, dtype, op):
         xfail('_masked.softmin', ''),
         xfail('amax', ''),
         xfail('amin', ''),
-        xfail('atan2', ''),
         xfail('block_diag', ''),
         xfail('cdist', ''),
         xfail('cholesky', ''),
-        xfail('cholesky_inverse', ''),
         xfail('dist', ''),
         xfail('eig', ''),
         xfail('fft.fft', ''),