Add comments for unused variables in _predict unpacking

Added comments to clarify the purpose of unused variables in the tuple unpacking from self._predict, improving code readability.

Author: edeno

src/non_local_detector/models/base.py

@@ -1238,7 +1238,8 @@ def estimate_parameters(
                 causal_state_probabilities,
                 predictive_state_probabilities,
                 log_likelihood,
-                _,
+                _,  # causal_posterior
+                _,  # predictive_posterior
             ) = self._predict(
                 time=time,
                 log_likelihood_args=log_likelihood_args,