Modularize LearningSolver into components; implement branch-priority

miplearn/component.py

@@ -0,0 +1,23 @@
+# MIPLearn, an extensible framework for Learning-Enhanced Mixed-Integer Optimization
+# Copyright (C) 2019-2020 Argonne National Laboratory. All rights reserved.
+# Written by Alinson S. Xavier <axavier@anl.gov>
+
+from abc import ABC, abstractmethod
+
+
+class Component(ABC):
+    @abstractmethod
+    def fit(self, solver):
+        pass
+    
+    @abstractmethod
+    def before_solve(self, solver, instance, model):
+        pass
+    
+    @abstractmethod
+    def after_solve(self, solver, instance, model):
+        pass
+    
+    @abstractmethod
+    def merge(self, other):
+        pass