Added support for IndexSpace in both sources and targets for DenseDesignMatrix
Added Penn Treebank dataset
Added projection operation to MatrixMul
Added ProjectionLayer to MLP
Updated IndexSpace for DenseDesignMatri when using topological views and also updated documentation
Fixed some docstring issues
Added Penn Treebank to the docstring whitelist
Fix typo
Moved most things to the sandbox and added a script
Fixed typo
Minor change to test model
Added docstrings to sandbox
Fixed docstring formatting
Removed the language model training script, just left the YAML file
Removed accidental paste
Added perplexity monitoring to NLP sandbox, clarified Penn Treebank arguments
Removed unnecessary __init__ method of NLP sandbox MatrixMul class
Extended projection operator tests
Fix docstring issues
Add results to language model YAML file