Fixed Bug regarding tfrecord shuffling in object_detection

[vladpaunescu]

In current implementation in models/research/object_detection/utils/dataset_util.py at line 137 records_dataset.shuffle(config.shuffle_buffer_size) is not assigned to variable, and it should be records_dataset = records_dataset.shuffle(config.shuffle_buffer_size)

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[vladpaunescu]

I signed it!

[googlebot]

CLAs look good, thanks!

[vladpaunescu]

Can you take a look please? Shuffling is also done in such a way that it doesn't generate random permatation. That is because file dataset is being repeated instead of records inside file. This impacts smaller datasets with no sharding.

[pkulzc]

Thanks for the fix!