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Movie Script Summarization as Graph-based Scene Extraction

Paper · 2015 · Philip John Gorinski and Mirella Lapata

Summary

Gorinski and Lapata introduce screenplay summarization as a new task. They argue it could help script readers, who must sift through thousands of submissions, by supporting browsing and giving a fast sense of a plot. They treat a summary as an extracted chain of consecutive scenes. A good chain should be important to the story, varied rather than repetitive, and show the story moving from start to finish.

Each script is modelled as a directed bipartite graph of scenes and characters. Edge weights come from linguistic analysis, including how likely a character is to be a main one and how much they interact. Scene-to-scene progression is scored with random walks with restart. The approach adapts an egocentric-video summarization method by Lu and Grauman (2013).

The authors also built ScriptBase, a large corpus of scripts linked to plot summaries and metadata. In a question-answering study on Amazon Mechanical Turk, readers answered more story questions correctly from SceneSum summaries than from baseline summaries. This suggests the model keeps the content that matters most for understanding the narrative.

Key points

  • ScriptBase corpus: 1,276 scripts across 23 genres, spanning 1909–2013.
    • Each film has on average about 3 user summaries, 3 loglines and 3 taglines, aligned via Wikipedia and IMDB.
    • Scripts were processed with Stanford CoreNLP and annotated with semantic roles using MATE tools.
  • Experimental data: experiments used comedies and thrillers, with 30 movies for training/development and 65 for testing.
  • Model (SceneSum): the objective is a weighted sum of three terms (story progression, diversity and importance), optimized under a compression rate.
    • It was compared with MaxOv and MinOv (maximum and minimum character overlap) and a Random baseline.
  • Automatic gold standard: MaxOv achieved the best F1 and SceneSum came second. The authors attribute this to an artifact of how the gold standard was built.
  • Human evaluation: 29 native English speakers answered questions about summaries at 20% compression.
    • SceneSum scored 56.91% correct overall, versus 51.51% (MaxOv), 50.54% (MinOv) and 39.53% (Random).
    • On the plot question, SceneSum reached 73.75%.
    • On the characters question, SceneSum scored lower than MaxOv (37.75% vs 45.54%).

Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.

 Institutions

Cite

Cite as Philip John Gorinski and Mirella Lapata. 2015. Movie Script Summarization as Graph-based Scene Extraction. Proceedings of the 2015 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies.

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.3115/v1/n15-1113

@inproceedings{gorinski2015movie,
  title = {{Movie Script Summarization as Graph-based Scene Extraction}},
  author = {Philip John Gorinski and Mirella Lapata},
  booktitle = {Proceedings of the 2015 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies},
  year = {2015},
  doi = {10.3115/v1/n15-1113},
  url = {https://doi.org/10.3115/v1/n15-1113}
}

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