Forgot to instantiate the rng.

[jgh9094]

https://github.com/EpistasisLab/tpot2/blob/8ebc82cb3b4d6fadfa5228a7de3134a9edc59acb/tpot2/search_spaces/nodes/estimator_node_gradual.py#L55C1-L56C1

We are forgetting to add 'rng = np.random.default_rng(rng)' to instantiate a new or old rng.

[perib]

this is technically not needed since it is handled by the gradual_hyperparameter_update function where the rng is used. but we could just have an extra check for clarity?

[jgh9094]

That's a good point, we don't need to instantiate the rng in the mutation function since we don't do anything with it!