Tensorboardx

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* Remove a dependency issue. (631)

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* Support logging to comet.ml simutaneously.

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* Support for type hints.
* Dropped Python 2 support.
* Bug fixes, see the commit log in Github.

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* Global SummaryWriter that mimics python's default logger class, concurrent write is supported.
* 200x speed up for add_audio. Please install the soundfile package for this feature.
* Supports jax tensors.
* The add_graph function is delegated to the one in torch.utils.tensorboard.
* Bug fixes, see the commit log in Github.

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* Now you can tag Hparams trials with custom name instead of the default epoch time
* Fixed a bug that add_hparams are rendered incorrectly with non-string values
* Supports logging to Amazon S3 or Google Cloud Storage
* Bug fixes and error message for add_embedding function
* Draw openvino format with add_openvino_graph

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* Use new JIT backend for pytorch. This works better with pytorch 1.2 and 1.3
* Supports hparams plugin
* add_embedding now supports numpy array input