v1.7.3: Alpha support for Hebrew, new CLI commands and bug fixes

✨ Major features and improvements

• NEW: Alpha tokenization for Hebrew.
• NEW: Experimental train and package commands to train a model and convert it to a Python package.
• Enable experimental support for L1-regularized regression loss in dependency parser and named entity recognizer. Should improve fine-tuning of existing models.
• Fix high memory usage in download command.

🔴 Bug fixes

• Fix issue #903, #912: Base forms are now correctly protected from lemmatization.
• Fix issue #909, #925: Use mlink to create symlinks in Python 2 on Windows.
• Fix issue #910: Update config when adding label to pre-trained model.
• Fix issue #911: Delete old training scripts.
• Fix issue #918: Use --no-cache-dir when downloading models via pip.
• Fixed infinite recursion in spacy.info.
• Fix initialisation of languages when no model is available.

📖 Documentation and examples

• Troubleshooting guide for most common issues and usage problems.
• Documentation for new package and train commands.
• Documentation for spaCy's JSON format for training data.
• Fix various typos and inconsistencies.

👥 Contributors

Thanks to @raphael0202, @pavlin99th, @iddoberger and @solresol for the pull requests!