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Many approaches have been proposed recently to identify the author of a given document. Thereby, one fact is often silently assumed: i.e., that the given document is indeed written by only author. For a realistic author identification system it is therefore crucial to at first determine whether a document is single- or multiauthored.
\n\nTo this end, previous PAN editions aimed to analyze multi-authored documents. As it has been shown that it is a hard problem to reliably identify individual authors and their contribution within a single document (Author Diarization, 2016; Style Breach Detection, 2017), last year's task substantially relaxed the problem by asking only for binary decision (single- or multi-authored). Considering the promising results achieved by the submitted approaches (see the overview paper for details), we continue last year's task and additionally ask participants to predict the number of involved authors.
\n\nGiven a document, participants thus should apply intrinsic style analyses to hierarchically answer the following questions:
\n\nAll documents are provided in English and may contain zero up to arbitrarily many style changes, resulting from arbitrarily many authors.
\n\nThe training set: contains 50% of the whole dataset and includes solutions. Use this set to feed/train your models.
\n\nLike last year, the whole data set is based on user posts from various sites of the StackExchange network, covering different topics and containing approximately 300 to 2000 tokens per document.
\n\nFor each problem instance X, two files are provided:
\n\nproblem-X.txt
contains the actual textproblem-X.truth
contains the ground truth, i.e., the correct solution in JSON format:{ \"authors\": number_of_authors, \"structure\": [author_segment_1, ..., author_segment_3], \"switches\": [ character_pos_switch_segment_1, ..., character_pos_switch_segment_n, ] }
\n\nAn example for a multi-author document could look as follows:
\n\n{ \"authors\": 4, \"structure\": [\"A1\", \"A2\", \"A4\", \"A2\", \"A4\", \"A2\", \"A3\", \"A2\", \"A4\"], \"switches\": [805, 1552, 2827, 3584, 4340, 5489, 7564, 8714] }
\n\nwhereas a single-author document would have exactly the following form:
\n\n{ \"authors\": 1, \"structure\": [\"A1\"], \"switches\": [] }
\n\nNote that authors within the structure correspond only to the respective document, i.e., they are not the same over the whole dataset. For example, author A1 in document 1 is most likely not the same author as A1 in document 2 (it could be, but as there are hundreds of authors the chances are very small that this is the case). Further, please consider that the structure and the switches are provided only as additional resources for the development of your algorithms, i.e., they are not expected to be predicted.
\n\nTo tackle the problem, you can develop novel approaches, extend existing algorithms from last year's task or adapt approaches from related problems such as intrinsic plagiarism detection or text segmentation. You are also free to additionally evaluate your approaches on last year's training/validation/test dataset (for the number of authors use the corresponding meta data).
", "languages": [ { "id": "eng", "title": { "en": "English" } } ], "publication_date": "2019-01-17", "publisher": "Zenodo", "references": [ { "reference": "Eva Zangerle, Michael Tschuggnall, G\u00fcnther Specht, Martin Potthast, and Benno Stein. Overview of the Style Change Detection Task at PAN 2019. In Linda Cappellato, Nicola Ferro, David E. Losada, and Henning M\u00fcller, editors, CLEF 2019 Labs and Workshops, Notebook Papers, September 2019. CEUR-WS.org." } ], "resource_type": { "id": "dataset", "title": { "de": "Datensatz", "en": "Dataset" } }, "subjects": [ { "subject": "authorship analysis" }, { "subject": "style" }, { "subject": "detection" }, { "subject": "change" } ], "title": "PAN19 Authorship Analysis: Style Change Detection" }, "parent": { "access": { "owned_by": { "user": 79446 }, "settings": { "accept_conditions_text": "Please request access to the data with a short statement on how you want to use it. Thanks!
\n\nWe would like to point out that you can register on pan.webis.de to be part of the PAN community.
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