clean up old code

Author: chunhuajiang

tensorflowTUT/tf5_example2/full_code.py

@@ -23,8 +23,6 @@
 loss = tf.reduce_mean(tf.square(y-y_data))
 optimizer = tf.train.GradientDescentOptimizer(0.5)
 train = optimizer.minimize(loss)
-
-init = tf.initialize_all_variables()
 ### create tensorflow structure end ###
 
 sess = tf.Session()