From 4f3de3ee0a6d5ba5b5206f2ecda84d943fa4e2d4 Mon Sep 17 00:00:00 2001
From: Tim O'Donnell <timodonnell@gmail.com>
Date: Mon, 16 Sep 2019 14:58:07 -0400
Subject: [PATCH] fix

---
 mhcflurry/class1_neural_network.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mhcflurry/class1_neural_network.py b/mhcflurry/class1_neural_network.py
index 22d1637c..dd367a33 100644
--- a/mhcflurry/class1_neural_network.py
+++ b/mhcflurry/class1_neural_network.py
@@ -796,7 +796,7 @@ class Class1NeuralNetwork(object):
                 self.hyperparameters["random_negative_method"])
 
         random_negative_allele_encoding = None
-        if random_negative_alleles:
+        if random_negative_alleles is not None:
             random_negative_allele_encoding = AlleleEncoding(
                 random_negative_alleles, borrow_from=allele_encoding)
 
-- 
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