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curl is pre-installed on the mac and the tensorflow docker image. wget
is not. This change allows this script to run on a stock mac, or in the
tensorflow docker image

- Removed replica_id which was removed from SyncReplicaOptimizer in V1.
- Removed call for get_clean_up_op which was removed from optimizer in V1.

`tf.mul` -> `tf.multiply`

Update inception model based on tf API changes: replace tf.op_scope with tf.name_scope and tf.variable_op_scope with tf.variable_scope; fix the order of arguments for tf.concat; replace tf.mul with tf.multiply.

* Variables defined in ExponentialMovingAverage need not to be shared.

* Address comments.

_bytes_feature excepted class bytes, but in python3 in class str,so use tf.compat.as_bytes for compatibility !