Reorganize imports; start moving data to instance.training_data

miplearn/problems/tests/test_stab.py

@@ -4,10 +4,11 @@
 
 import networkx as nx
 import numpy as np
-from miplearn import LearningSolver
-from miplearn.problems.stab import MaxWeightStableSetInstance
 from scipy.stats import uniform, randint
 
+from miplearn.problems.stab import MaxWeightStableSetInstance
+from miplearn.solvers.learning import LearningSolver
+
 
 def test_stab():
     graph = nx.cycle_graph(5)