code: def prior(self, value):
      # This does not check which argument has hyperprior (must be dispersion?)
      assert isinstance(
          value, VALID_PRIORS
      ), f"Prior must be one of {VALID_PRIORS}"
      if isinstance(value, Prior):
          any_hyperprior = any(
              isinstance(x, Prior) for x in value.args.values()
          )
          if not any_hyperprior:
              raise ValueError(
                  "Prior for group-specific terms must have hyperpriors"
              )
      self._prior = value
  
imports: import numpy
  import formulae.terms
  from bambi.terms.base import BaseTerm, VALID_PRIORS
  from bambi.priors.prior import Prior
label_desc: Use image node_id 13 for calling the GroupSpecificTerm obj's underlying member method code with example usage: obj.prior(value) without return types