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* Redefinition of the models' API (simplified interfaces, renamed LP
methods and added get_embeddings method)
* Implementation of the new API for all models
* TorusE implementation fixed
* TransD reimplementation to avoid matmul usage (costly in
back-propagation)
* Added feature to negative samplers to generate several negative
samples from each fact. Those can be fed directly to the models.
* Added some wrappers for training to utils module.
* Progress bars now make the most of tqdm's possibilities
* Code reformatting
* Docstrings update