Vanda-Haskell

Vanda-Haskell is a toolkit that contains various proof-of-concept implementations of algorithms from natural language processing.

Install Vanda-Haskell using cabal

• you need to have ghc and cabal installed
• change to the project’s root directory
• (optionally) create a sandbox via cabal sandbox init
• install via cabal install --enable-documentation

The installation provides the command line tool vanda and a Haskell library.

Usage of the command line tool

• You can run the tool via cabal exec -- vanda from the project’s root directory. Alternatively you can locate the binary via cabal exec which vanda and run it directly or add the containing directory to your PATH.

• Algorithms are called via git-style subcommands, e.g., cabal exec -- vanda brackets mdyck '[(,{' ']),}' '{([])[()]}'.

• Each subcommand has its own help subcommand that provides further information, e.g., cabal exec -- vanda brackets help.

• Running vanda without arguments shows you the following list of available top-level subcommands:

  vanda [COMMAND] ...
    Vanda
  
  Commands:
    brackets   algorithms for Dyck and multiple Dyck languages
    cbsm       Count-Based State Merging
    lcfrs      algorithms for probabilistic LCFRS
    pmcfg      algorithms for weighted parallel multiple context-free grammars
    ngrams     algorithms for n-gram models
    pdta       grammatical inference of probabilistic deterministic tree
               automata (experimental!)
    xrsngrams  algorithms for combining n-gram models and translation models
    pcfg       algorithms for extracting and training PCFGs
  
  Every mode provides a sub-mode help, which displays only help concerning this
  mode. Every help mode has an optional argument which defines the help format.
  

Install and Usage with stack

• You need to have stack installed.

• Change to the project’s root directory and

• install via stack build --copy-bins.

• You can run the tool via stack exec -- vanda from any directory. Alternatively you can locate the binary via stack exec which vanda and run it directly or add the containing directory to your PATH.

The Vanda Haskell library

Currently, the library just exposes nearly every module there is in the project. This includes the modules that implement the functionality of the command line tool. The API is not fixed, yet.

The modules are documented using haddock syntax. While installation cabal collects the haddock documentation and API information to create easy-to-read HTML pages if the --enable- documentation flag is used or documentation: True is set in cabal’s configuration file. The location of the documentation is output during the installation.