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This reverts commit 649e0374.

* Add a second expected_loss_weights function using an alternative expectation calculation compared to previous. Integrate this op into ssd_meta_arch and losses builder. Affects files that use losses_builder.build to handle the returning of an additional element.

PiperOrigin-RevId: 219190083

* Fix dependency issues.

PiperOrigin-RevId: 222888231

* Update CODEOWNERS 

Add @masonliuw and @yinxiaoli to /research/lstm_object_detection/

Open souring mobile video object detection framework

We've deprecated the "tower" terminology in DistributionStrategy, so the "cross_tower_ops" argument is now "cross_device_ops", matching the current name of "AllReduceCrossDeviceOps".

Switching to more robust pysoundfile for reading wav files

Explicitly mention Python 2.7 in README for research/im2txt

Freeze environment using Conda for research/im2txt

Added struct2depth model

Improved performance of deeplab inference

`num_replicas` is being replaced by `num_replicas_in_sync` and something that returns the number of steps running concurrently.

Update lite path + fix --config option

`lite` is no longer under `contrib`. 

Additionally, `--config=opt` fails, see: https://github.com/tensorflow/serving/issues/517

This tag should match EVAL_HP_NUM_NEG.

Revert "Use explicit relative import syntax for python 3 compatibility in audioset."

Update 4_Neural_Style_Transfer_with_Eager_Execution.ipynb

Fixed grammar errors and typos.

Use explicit relative import syntax for python 3 compatibility in audioset.

I've noticed sometimes the async process's pool processes do not die when ncf_main.py ends and kills the async process. This commit fixes the issue.