diff --git a/sampler/show_samples_lfw_conditional.py b/sampler/show_samples_lfw_conditional.py
index f0016c4..6de1eed 100644
--- a/sampler/show_samples_lfw_conditional.py
+++ b/sampler/show_samples_lfw_conditional.py
@@ -1,7 +1,9 @@
 from argparse import ArgumentParser
 
+import numpy as np
 from pylearn2.config import yaml_parse
 from pylearn2.gui.patch_viewer import PatchViewer
+from pylearn2.utils import serial
 
 from adversarial import sampler