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.

Some further links fixes

The `center` tag would cause the image not to be rendered, but the raw text to be inserted. Simply removing the center tag fixes this.

Second row had an extra set of dashes, making the markdown invalid and falling back to raw text instead of the intended table.