Fix sequence padding documentation

[joshzwiebel]

The default parameter for padding is pre. The docs reflect the change

Summary

Related Issues

PR Overview

• [ n] This PR requires new unit tests [y/n] (make sure tests are included)
• [ n] This PR requires to update the documentation [y/n] (make sure the docs are up-to-date)
• [y ] This PR is backwards compatible [y/n]
• [n ] This PR changes the current API [y/n] (all API changes need to be approved by fchollet)

[Dref360]

You need to remove dist: trusty in travis.yml

[joshzwiebel]

You need to remove dist: trusty in travis.yml

I can do that. What does that line do?

[Dref360]

It forces the ubuntu version to be trusty, but we want the latest.
I mad ea PR myself, but I cannot merge it myself, so if you could do it that would be awesome!

[joshzwiebel]

Sure. I will do that today. I am trying to be more involved in open source, other than the good first issues page here is there anywhere else that specifically needs work?

[Dref360]

At the last Keras board meeting, it was voted to deprecate Keras-preprocessing
in favor of a new keras module that would be more composable. (see keras-team/governance#10)

So contributing to this new API would be best. (here: https://github.com/tensorflow/tensorflow/tree/master/tensorflow/python/keras/layers/preprocessing)

The issue right now is that Keras is still tightly integrated with TF, but it should be split in the future! (see tensorflow/community#202)

This will make contributing easier because the CI will be faster.

[joshzwiebel]

Thanks for your response! A standalone Keras repo would be great because I definitely feel more comfortable contributing to Keras than most of TensorFlow and it is easy to get lost or have difficulty navigating such a large repository. I will migrate future contributions to the TensorFlow repo