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The data_async_generation.py process would print to stderr, but the main process would redirect it's stderr to a pipe. The main process never read from the pipe, so when the pipe was full, data_async_generation.py would stall on a write to stderr. This change makes data_async_generation.py not write to stdout/stderr.

The output of an embeddding layer is already flattened, so the Flatten layers acted as no-ops.

* Fix crash when Python interpreter not on PATH.

* Fix lint error.

* add indirection file

* remove unused imports

* fix import

* intermediate commit

* ncf now working

* reorder pipeline

* allow batched decode for file backed dataset

* fix bug

* more tweaks

* parallize false negative generation

* shared pool hack

* workers ignore sigint

* intermediate commit

* simplify buffer backed dataset creation to fixed length record approach only. (more cleanup needed)

* more tweaks

* simplify pipeline

* fix misplaced cleanup() calls. (validation works\!)

* more tweaks

* sixify memoryview usage

* more sixification

* fix bug

* add future imports

* break up training input pipeline

* more pipeline tuning

* first pass at moving negative generation to async

* refactor async pipeline to use files instead of ipc

* refactor async pipeline

* move expansion and concatenation from reduce worker to generation workers

* abandon complete async due to interactions with the tensorflow threadpool

* cleanup

* remove per...

Removed the conditional over distributed strategies when computing metrics.
Metrics are now computed even when distributed strategies are used.

* fix batch_size in transformer_main.py

fix batch_size in transformer_main.py which causes ResourceExhaustedError: OOM during training Transformer models using models/official/transformer

* small format change

change format from one line to multiple ones in order to pass lint tests

* remove trailing space and add comment

float32 should be fine for mnist loss and accuracy metrics and float64
is not available on TPUs.

* Add more arguments

* Add eager mode

* Add notes for eager mode

* Address the comments

* Fix argument typos

* Add warning for eager and multi-gpu

* Fix typo

* Fix notes

* Fix pylint

* Add callbacks

* Add readme

* update readme

* fix some comments

* Address all comments

* Update docstrings

* Add method docstrings

* Update callbacks

* Add comments on global_step initialization

* Some updates

* Address comments

* Add shorter timeout for GCP util.

* Add comment for change reason and unit for timeout.

* Use six and feature detection in string conversion

Leverage [__six.ensure_text()__](https://github.com/benjaminp/six/blob/master/six.py#L890) to deliver Unicode text in both Python 2 and Python 3.

Follow Python porting best practice [use feature detection instead of version detection](https://docs.python.org/3/howto/pyporting.html#use-feature-detection-instead-of-version-detection) in ___unicode_to_native()__.

* Revert the use of six.ensure_text()

Thanks for catching that!  I jumped the gun.  It is I who have brought shame...

* Rename of files in README.md

The name of the files to run specified in the README.md file were not updated.

* Missed one file name change

* begin branch

* finish download script

* rename download to dataset

* intermediate commit

* intermediate commit

* misc tweaks

* intermediate commit

* intermediate commit

* intermediate commit

* delint and update census test.

* add movie tests

* delint

* fix py2 issue

* address PR comments

* intermediate commit

* intermediate commit

* intermediate commit

* finish wide deep transition to vanilla movielens

* delint

* intermediate commit

* intermediate commit

* intermediate commit

* intermediate commit

* fix import

* add default ncf csv construction

* change default on download_if_missing

* shard and vectorize example serialization

* fix import

* update ncf data unittests

* delint

* delint

* more delinting

* fix wide-deep movielens serialization

* address PR comments

* add file_io tests

* investigate wide-deep test failure

* remove hard coded path and properly use flags.

* address file_io test PR comments

* missed a hash_bucked_size

* remove unused imports and lint

* fix schedule.py

* address PR comments

* Add checklist for official models. Remove file access from flag validator (causing issues with BUILD)

* spelling

* address PR comments

* Add DistributionStrategy to transformer model

* add num_gpu flag

* Calculate per device batch size for transformer

* remove reference to flags_core

* Add synthetic data option to transformer

* fix typo

* add import back in

* Use hierarchical copy

* address PR comments

* lint

* fix spaces

* group train op together to fix single GPU error

* Fix translate bug (sorted_keys is a dict, not a list)

* Change params to a default dict (translate.py was throwing errors because params didn't have the TPU parameters.)

* Address PR comments. Removed multi gpu flag + more

* fix lint

* fix more lints

* add todo for Synthetic dataset

* Update docs

* fix comment

* align comment

* Improve the BenchmarkFileLogger performance.

Open and preserve the file handler of the metric log file during
init, which reduce the overhead of open/close the file for each
log_metric call.

* Address review comment.

* add .take() to dataset pipeline

* delint

* address PR comments

* add tests for matmul embedding and schedule manager, as well as some minor cleanup

* delint

* address PR comments

This will prevent the unit test to read the local config of the GCP API, which does not necessary to exist for the test environment.