def _set_expressions(self, expressions):
        Symbolic_core._set_expressions(self, expressions)
        Symbolic_core._set_variables(self, self.cacheable)
        # Substitute z with x to obtain kdiag.
        for x, z in zip(self.variables['X'], self.variables['Z']):
            expressions['kdiag'] = expressions['kdiag'].subs(z, x)
        Symbolic_core._set_expressions(self, expressions)
Validates that the given email address is not used by another user.
dataset/ETHPy150Open SheffieldML/GPy/GPy/kern/src/symbolic.py/Symbolic._set_expressions--crossover with--dataset/ETHPy150Open scieloorg/scielo-manager/scielomanager/journalmanager/forms.py/UserForm.clean_email