Fix learning rate of ctc example (#10790)

The training of ctc will not converge in 100 epochs with learning rate 0.001, So change it to 0.01.

example/ctc/hyperparams.py

@@ -29,7 +29,7 @@ def __init__(self):
         self._eval_epoch_size = 3000
         self._batch_size = 128
         self._num_epoch = 100
-        self._learning_rate = 0.001
+        self._learning_rate = 0.01
         self._momentum = 0.9
         self._num_label = 4
         # Network hyper parameters