Add types to internal solvers

miplearn/instance.py

@@ -164,12 +164,3 @@ class Instance(ABC):
         data = json.dumps(self.__dict__, indent=2).encode("utf-8")
         with gzip.GzipFile(filename, "w") as f:
             f.write(data)
-
-
-class PyomoInstance(Instance, ABC):
-    @abstractmethod
-    def to_model(self) -> pe.ConcreteModel:
-        """
-        Returns the concrete Pyomo model corresponding to this instance.
-        """
-        pass