Fix for #20361: PPL backend re-solves the problem every time get_variable_value or get_objective_value is called

Author: Matthias Koeppe

src/sage/numerical/backends/ppl_backend.pyx

@@ -573,7 +573,6 @@ cdef class PPLBackend(GenericBackend):
             sage: p.get_variable_value(1)
             3/2
         """
-        self.init_mip()
         ans = self.mip.optimal_value()
         return ans / self.obj_denominator + self.obj_constant_term
 
@@ -602,7 +601,6 @@ cdef class PPLBackend(GenericBackend):
             sage: p.get_variable_value(1)
             3/2
         """
-        self.init_mip()
         g = self.mip.optimizing_point()
         return g.coefficient(Variable(variable)) / g.divisor()