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Implementation of different variants of Parseval metric
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README.md

GR-PARSEVAL - different variants of Parseval constituency parser evaluation metric

Quickstart

Step 1. If you don't have Lisp installed, do that. We recommend SBCL or Clozure CL.

Step 2. Get quicklisp and set it up. It's simple, follow the instructions.

Step 3. Download the source code to ~/quicklisp/local-projects/gr-parseval/

Step 4. Start your Lisp. After it loads, in the prompt type: (ql:quickload :gr-parseval)

Step 5. If everything loaded fine and without any errors, you can experiment now. Here's how it may look:

CL-USER> (parseval:parseval '(NP (NNS "foo") (CC "and") (NN "bar"))
                            '(NP (NP (NN "foo")) (CC "and") (NN "bar")))
(3/5 3/4 2/3)
(3 4 5)

This means that you have precision of 3/5, recall of 3/4 and F1 of 2/3. There are 4 nodes in the test tree (comes first), 5 nodes in the gold tree, and 3 nodes have matched.

Step 6. You need to supply trees in the format that Lisp will understand. Basically, it means that word-level nodes should be quoted, and some special characters should be escaped.

If you have some existing corpus you'd like to experiment with, you'll need to read and adapt the trees from it. If the corpus is in Penn Treebank format, you can do it with the utilities from cl-nlp. Here's a more elaborate description - see section "Available data and tools to process it".

Contributors

License

Copyright (c) 2014 Grammarly Inc.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

Except as contained in this notice, the name(s) of the above copyright holders shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization.

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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