remove sandbox code

Author: komaksym

questions/151_stepLR/solution.py

@@ -32,8 +32,4 @@ def get_lr(self, epoch):
         # to the initial learning rate.
         current_lr = self.initial_lr * (self.gamma ** num_decays)
 
-        return current_lr
-
-
-scheduler = StepLRScheduler(initial_lr=0.1, step_size=5, gamma=0.5)
-print(scheduler.get_lr(epoch=9))
+        return current_lr