Update removed torch.symeig in parametrizations.py (#2472)

* Update removed torch.symeig from parametrizations.py
torch.symeig was removed pytorch/pytorch#70988
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Co-authored-by: Mario Lezcano Casado <[email protected]>

Author: kit1980

intermediate_source/parametrizations.py

@@ -255,7 +255,7 @@ def forward(self, X):
 parametrize.register_parametrization(layer_spd, "weight", MatrixExponential())
 X = layer_spd.weight
 print(torch.dist(X, X.T))                        # X is symmetric
-print((torch.symeig(X).eigenvalues > 0.).all())  # X is positive definite
+print((torch.linalg.eigvalsh(X) > 0.).all())  # X is positive definite
 
 ###############################################################################
 # Initializing parametrizations