def clear_cache(self):
self._cache.clear()<EOL>
Clear values cached based on the neural networks in this predictor.

Users should call this after mutating any of the following:
    - class1_pan_allele_models
    - allele_to_allele_specific_models
    - allele_to_fixed_length_sequence

Methods that mutate these instance variables will call this method on
their own if needed.