Remove last references to `imports85`

+ Removed try-except on `import pandas`, pandas is no longer optional here.

fix py3 compatibility issues. 

temporarily change tf_example_decoder to not depend on BackupHandler.

Small fix on TensorBoard visualization section

Update version string to 1.4 in docker_test.sh.

Fix nasnet image classification and object detection

Fix nasnet image classification and object detection by moving the
option to turn ON or OFF batch norm training into it's own arg_scope
used only by detection

change DEFINE_list to DEFINE_string. 

Remove unused g3 dependency.

Fix the pointer for downloading the NAS Faster-RCNN model. fixes #2660

Fixes imports

PiperOrigin-RevId: 173917628

PiperOrigin-RevId: 173823563

Create __init__.py

fixes #2626 as Tuple Parameter Unpacking is removed from Python 3

Update nasnet_utils.py

Add __init__.py file in nasnet directory.

Remove google3 dependency on opensourced NASNet.

Fixes #2634

nasnet config, model and release info.

feature extractor and model builder update.