Fix too much value of default max_steps of 2560 epoch to 256 epoch

tutorials/image/cifar10/cifar10_train.py

@@ -48,7 +48,7 @@ FLAGS = tf.app.flags.FLAGS
 tf.app.flags.DEFINE_string('train_dir', '/tmp/cifar10_train',
                            """Directory where to write event logs """
                            """and checkpoint.""")
-tf.app.flags.DEFINE_integer('max_steps', 1000000,
+tf.app.flags.DEFINE_integer('max_steps', 100000,
                             """Number of batches to run.""")
 tf.app.flags.DEFINE_boolean('log_device_placement', False,
                             """Whether to log device placement.""")