DeepStochLog initial release

This is the DeepStochLog release from the AAAI22 publication called "DeepStochLog: Neural Stochastic Logic Programming".

We've also added several of the datasets used in this paper in this release:

• The datasets used for the brackets and anbncn tasks can be found in the attached binary brackets-anbncn-datasets-deepstochlog.
• wap.zip includes the Word Algebra Problem originating from https://github.com/uclnlp/d4/tree/master/data/wap
• hwf.zip includes the full Handwritten Mathematical Expressions dataset from https://arxiv.org/abs/2006.06649
• The addition dataset can be created from the default MNIST dataset using the addition_data.py script