GitLab

Make ptb_word_lm compatible with the latest TensorFlow source while maintaining backwards compatibility with TF 1.0

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.

Fix Mac build: avoid duplicating TF symbols

Fix links to download Parsey models

Add license headers, fix some macOS issues

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

SyntaxNet does not compile with gcc version 5.4.0 20160609 (Ubuntu
5.4.0-6ubuntu1~16.04.4). This leads to the error in #1194.

Including cmath and using the std namespace for isnan solves this
problem.