Merge pull request aws#253 from awslabs/arpin_recsys_pip_fix

Fixed: pip install pandas in container

Author: djarpin

introduction_to_applying_machine_learning/gluon_recommender_system/recommender.py

@@ -7,8 +7,7 @@
 from mxnet.metric import MSE
 import numpy as np
 
-import pip
-pip.main(['install', 'pandas'])
+os.system('pip install pandas')
 import pandas as pd
 
 logging.basicConfig(level=logging.DEBUG)