Alternative scorer for the CoNLL-2011/2012 shared tasks on coreference resolution.

# Scorch¹

This is an alternative implementation of the coreference scorer for the CoNLL-2011/2012 shared tasks on coreference resolution.

It aims to be more straightforward than the reference implementation, while maintaining as much compatibility with it as possible.

The implementations of the various scores are as close as possible from the formulas used by Pradhan et al. (2014), with the edge cases for BLANC taken from Recasens and Hovy (2011).

1. Scorer for coreference chains.

## Usage

scorch gold.json sys.json out.txt


## Install

From the cheeseshop

python3 -m pip install --user scorch


Or directly from git

python3 -m pip install --user git+https://github.com/LoicGrobol/scorch.git


## Formats

### Single document

The input files should be JSON files with a "type" key at top-level

• If "type" is "graph", then top-level should have at top-level
• A "mentions" key containing a list of all mention identifiers
• A "links" key containing a list of pairs of corefering mention identifiers
• If "type" is "clusters", then top-level should have a "clusters" key containing a mapping from clusters ids to cluster contents (as lists of mention identifiers).

Of course the system and gold files should use the same set of mention identifiers for the mentions they have in common.

For convenience, the conll.py converts CoNLL-2012 files to this format.

### Multiple documents

If the inputs are directories, files with the same base name (excluding extension) as those present in the sys directory are expected to be present in the gold directory, with exactly one gold file for each sys file. In that case, the output scores will be the micro-average of the individual files scores, ie their arithmetic means weighted by the relative numbers of

• Gold mentions for Recall
• System mentions for Precision
• The sum of the previous two for F₁

This is different from the reference interpretation where

• MUC weighting ignores mentions in singleton entities
• This should not make any difference for the CoNLL-2012 dataset, since singleton entities are not annotated.
• For datasets with singletons, the shortcomings of MUC are well known, so this score shouldn't matter much
• BLANC is calculated by micro-averaging coreference and non-coreference separately, using the number of links as weights instead of the number of mentions.
• This is roughly equivalent to weighting coreference scores per document by their number of non-singleton clusters and non-coreference scores by the square of their number of mentions. This give disproportionate importance to large documents, which is not desirable in heterogenous corpora

The CoNLL average score is the arithmetic mean of the global MUC, B³ and CEAFₑ F₁ scores.

## Sources

Unless otherwise specified (see below), the following licence (the so-called “MIT License”) applies to all the files in this repository. See also LICENSE.md.

Copyright 2018 Loïc Grobol <loic.grobol@gmail.com>

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