Reorganize imports; start moving data to instance.training_data

miplearn/problems/tests/test_tsp.py

@@ -2,13 +2,14 @@
 #  Copyright (C) 2020, UChicago Argonne, LLC. All rights reserved.
 #  Released under the modified BSD license. See COPYING.md for more details.
 
-from miplearn import LearningSolver
-from miplearn.problems.tsp import TravelingSalesmanGenerator, TravelingSalesmanInstance
 import numpy as np
 from numpy.linalg import norm
 from scipy.spatial.distance import pdist, squareform
 from scipy.stats import uniform, randint
 
+from miplearn.problems.tsp import TravelingSalesmanGenerator, TravelingSalesmanInstance
+from miplearn.solvers.learning import LearningSolver
+
 
 def test_generator():
     instances = TravelingSalesmanGenerator(