From 5fd13981d44dd8f33f961e1ff3759ba436993357 Mon Sep 17 00:00:00 2001
From: "Alinson S. Xavier" <git@axavier.org>
Date: Sun, 11 Apr 2021 17:39:55 -0500
Subject: [PATCH] Append sample

---
 miplearn/solvers/learning.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/miplearn/solvers/learning.py b/miplearn/solvers/learning.py
index 9dc36da..57daf61 100644
--- a/miplearn/solvers/learning.py
+++ b/miplearn/solvers/learning.py
@@ -139,8 +139,9 @@ class LearningSolver:
         # Initialize training sample
         # -------------------------------------------------------
         training_sample = TrainingSample()
-        instance.training_data += [training_sample]
         sample = Sample()
+        instance.training_data.append(training_sample)
+        instance.samples.append(sample)
 
         # Initialize stats
         # -------------------------------------------------------