pyphi.exceptions.TransitionUnreachableError

exception pyphi.exceptions.TransitionUnreachableError(before_state, after_state, message=None)

The transition has zero probability under the substrate dynamics.

Raised when a state pair violates the Realization principle of Albantakis et al. (2019): a transition is defined only when p(after state | before state) > 0.

Parameters:

• before_state (tuple[int, ...])

• after_state (tuple[int, ...])

• message (str | None)

Return type:

None