Fix abstract class error (#1451)

* Fix

* Instead raise error

* Value error is better

* formatting

Author: manuelgloeckler

sbi/inference/potentials/score_fn_iid.py

@@ -647,6 +647,9 @@ class JacCorrectedScoreFn(BaseGaussCorrectedScoreFunction):
     in some cases.
     """
 
+    def posterior_precision_est_fn(self, conditions: Tensor) -> Tensor:
+        raise ValueError("This method does not use the posterior precision estimation.")
+
     def marginal_denoising_posterior_precision_est_fn(
         self,
         time: Tensor,