Bump version to 1.13.4

PiperOrigin-RevId: 247220994

Bump setup.py to 1.13.3 -- Travis is green.

PiperOrigin-RevId: 247125411

Bump setup.py to 1.13.2 -- Travis is green.

PiperOrigin-RevId: 242497797

Make TransformerLM train reasonably well in trax. Adding loss and met…

…ric masking and dropout refactor in Transformer.

PiperOrigin-RevId: 239692595

TPU compatibility for data chunking

PiperOrigin-RevId: 237326592

Bump setup.py version to 1.12.0

PiperOrigin-RevId: 228952259

Bump setup.py version to 1.11.0

PiperOrigin-RevId: 221568618

Fix Problem.feature_info.

PiperOrigin-RevId: 219247790

s/runScheduledSampleFunc/_run_scheduled_sample_func to keep linter ha…

…ppy.

PiperOrigin-RevId: 212057756

v 1.8.0

PiperOrigin-RevId: 209442376