Pytorch-nn-tools

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* Added top-k accuracy computation, TensorBoardMetricLogger
* ProgressTracker preserves len of iterable

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* ProgressTracker tracks iterations inside each epoch
* Cleaner version of checkpoint saver
* Added tests
* Drop support of python 3.5
* Added to_device and apply_recursively helpers

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Added tools for training: metric processors, checkpoint creation, progress tracking, dictionary conversion

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* added visualization functions

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* Setup tests, docs

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* First release on PyPI.