Remove linear_scheduler

dan/schedulers.py

@@ -41,7 +41,3 @@ def exponential_dropout_scheduler(dropout_rate, step, max_step):
 def exponential_scheduler(init_value, end_value, step, max_step):
     step = min(step, max_step - 1)
     return init_value - (init_value - end_value) * (1 - np.exp(-10 * step / max_step))
-
-
-def linear_scheduler(init_value, end_value, step, max_step):
-    return init_value + step * (end_value - init_value) / max_step