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X-GENRE classifier - multilingual text genre classifier

Text classification model based on xlm-roberta-base and fine-tuned on a combination of three genre datasets: Slovene GINCO dataset (Kuzman et al., 2022), the English CORE dataset (Egbert et al., 2015) and the English FTD dataset (Sharoff, 2018). The model can be used for automatic genre identification, applied to any text in a language, supported by the xlm-roberta-base.

The details on the model development, the datasets and the model's in-dataset, cross-dataset and multilingual performance are provided in the paper Automatic Genre Identification for Robust Enrichment of Massive Text Collections: Investigation of Classification Methods in the Era of Large Language Models (Kuzman et al., 2023).

If you use the model, please cite the paper:

@article{kuzman2023automatic,
  title={Automatic Genre Identification for Robust Enrichment of Massive Text Collections: Investigation of Classification Methods in the Era of Large Language Models},
  author={Kuzman, Taja and Mozeti{\v{c}}, Igor and Ljube{\v{s}}i{\'c}, Nikola},
  journal={Machine Learning and Knowledge Extraction},
  volume={5},
  number={3},
  pages={1149--1175},
  year={2023},
  publisher={MDPI}
}

AGILE - Automatic Genre Identification Benchmark

We set up a benchmark for evaluating robustness of automatic genre identification models to test their usability for the automatic enrichment of large text collections with genre information. You are welcome to request the test dataset and submit your entry at the benchmark's GitHub repository.

In an out-of-dataset scenario (evaluating a model on a manually-annotated English dataset on which it was not trained), the model outperforms all other technologies:

micro F1 macro F1 accuracy
XLM-RoBERTa, fine-tuned on the X-GENRE dataset - X-GENRE classifier (Kuzman et al. 2023) 0.68 0.69 0.68
GPT-4 (7/7/2023) (Kuzman et al. 2023) 0.65 0.55 0.65
GPT-3.5-turbo (Kuzman et al. 2023) 0.63 0.53 0.63
SVM (Kuzman et al. 2023) 0.49 0.51 0.49
Logistic Regression (Kuzman et al. 2023) 0.49 0.47 0.49
FastText (Kuzman et al. 2023) 0.45 0.41 0.45
Naive Bayes (Kuzman et al. 2023) 0.36 0.29 0.36
mt0 0.32 0.23 0.27
Zero-Shot classification with MoritzLaurer/mDeBERTa-v3-base-mnli-xnli @ HuggingFace 0.2 0.15 0.2
Dummy Classifier (stratified) (Kuzman et al. 2023) 0.14 0.1 0.14

Intended use and limitations

Usage

An example of preparing data for genre identification and post-processing of the results can be found here where we applied X-GENRE classifier to the English part of MaCoCu parallel corpora.

For reliable results, genre classifier should be applied to documents of sufficient length (the rule of thumbs is at least 75 words). It is advised that the predictions, predicted with confidence lower than 0.9, are not used. Furthermore, the label "Other" can be used as another indicator of low confidence of the predictions, as it often indicates that the text does not have enough features of any genre, and these predictions can be discarded as well.

After proposed post-processing (removal of low-confidence predictions, labels "Other" and in this specific case also label "Forum"), the performance on the MaCoCu data based on manual inspection reached macro and micro F1 of 0.92.

Use examples

from simpletransformers.classification import ClassificationModel
model_args= {
            "num_train_epochs": 15,
            "learning_rate": 1e-5,
            "max_seq_length": 512,
            "silent": True
            }
model = ClassificationModel(
    "xlmroberta", "classla/xlm-roberta-base-multilingual-text-genre-classifier", use_cuda=True,
    args=model_args
    
)
predictions, logit_output = model.predict(["How to create a good text classification model? First step is to prepare good data. Make sure not to skip the exploratory data analysis. Pre-process the text if necessary for the task. The next step is to perform hyperparameter search to find the optimum hyperparameters. After fine-tuning the model, you should look into the predictions and analyze the model's performance. You might want to perform the post-processing of data as well and keep only reliable predictions.", 
                                        "On our site, you can find a great genre identification model which you can use for thousands of different tasks. With our model, you can fastly and reliably obtain high-quality genre predictions and explore which genres exist in your corpora. Available for free!"]
                                        )
predictions
# Output: array([3, 8])

[model.config.id2label[i] for i in predictions]
# Output: ['Instruction', 'Promotion']

Use example for prediction on a dataset, using batch processing, is available via Google Collab.

X-GENRE categories

List of labels:

labels_list=['Other', 'Information/Explanation', 'News', 'Instruction', 'Opinion/Argumentation', 'Forum', 'Prose/Lyrical', 'Legal', 'Promotion'],

labels_map={'Other': 0, 'Information/Explanation': 1, 'News': 2, 'Instruction': 3, 'Opinion/Argumentation': 4, 'Forum': 5, 'Prose/Lyrical': 6, 'Legal': 7, 'Promotion': 8}

Description of labels:

Label Description Examples
Information/Explanation An objective text that describes or presents an event, a person, a thing, a concept etc. Its main purpose is to inform the reader about something. Common features: objective/factual, explanation/definition of a concept (x is …), enumeration. research article, encyclopedia article, informational blog, product specification, course materials, general information, job description, manual, horoscope, travel guide, glossaries, historical article, biographical story/history.
Instruction An objective text which instructs the readers on how to do something. Common features: multiple steps/actions, chronological order, 1st person plural or 2nd person, modality (must, have to, need to, can, etc.), adverbial clauses of manner (in a way that), of condition (if), of time (after …). how-to texts, recipes, technical support
Legal An objective formal text that contains legal terms and is clearly structured. The name of the text type is often included in the headline (contract, rules, amendment, general terms and conditions, etc.). Common features: objective/factual, legal terms, 3rd person. small print, software license, proclamation, terms and conditions, contracts, law, copyright notices, university regulation
News An objective or subjective text which reports on an event recent at the time of writing or coming in the near future. Common features: adverbs/adverbial clauses of time and/or place (dates, places), many proper nouns, direct or reported speech, past tense. news report, sports report, travel blog, reportage, police report, announcement
Opinion/Argumentation A subjective text in which the authors convey their opinion or narrate their experience. It includes promotion of an ideology and other non-commercial causes. This genre includes a subjective narration of a personal experience as well. Common features: adjectives/adverbs that convey opinion, words that convey (un)certainty (certainly, surely), 1st person, exclamation marks. review, blog (personal blog, travel blog), editorial, advice, letter to editor, persuasive article or essay, formal speech, pamphlet, political propaganda, columns, political manifesto
Promotion A subjective text intended to sell or promote an event, product, or service. It addresses the readers, often trying to convince them to participate in something or buy something. Common features: contains adjectives/adverbs that promote something (high-quality, perfect, amazing), comparative and superlative forms of adjectives and adverbs (the best, the greatest, the cheapest), addressing the reader (usage of 2nd person), exclamation marks. advertisement, promotion of a product (e-shops), promotion of an accommodation, promotion of company's services, invitation to an event
Forum A text in which people discuss a certain topic in form of comments. Common features: multiple authors, informal language, subjective (the writers express their opinions), written in 1st person. discussion forum, reader/viewer responses, QA forum
Prose/Lyrical A literary text that consists of paragraphs or verses. A literary text is deemed to have no other practical purpose than to give pleasure to the reader. Often the author pays attention to the aesthetic appearance of the text. It can be considered as art. lyrics, poem, prayer, joke, novel, short story
Other A text that which does not fall under any of other genre categories.

Performance

Comparison with other models at in-dataset and cross-dataset experiments

The X-GENRE model was compared with xlm-roberta-base classifiers, fine-tuned on each of genre datasets separately, using the X-GENRE schema (see experiments in https://github.com/TajaKuzman/Genre-Datasets-Comparison).

At the in-dataset experiments (trained and tested on splits of the same dataset), it outperforms all datasets, except the FTD dataset which has a smaller number of X-GENRE labels.

Trained on Micro F1 Macro F1
FTD 0.843 0.851
X-GENRE 0.797 0.794
CORE 0.778 0.627
GINCO 0.754 0.75

When applied on test splits of each of the datasets, the classifier performs well:

Trained on Tested on Micro F1 Macro F1
X-GENRE CORE 0.837 0.859
X-GENRE FTD 0.804 0.809
X-GENRE X-GENRE 0.797 0.794
X-GENRE X-GENRE-dev 0.784 0.784
X-GENRE GINCO 0.749 0.758

The classifier was compared with other classifiers on 2 additional genre datasets (to which the X-GENRE schema was mapped):

  • EN-GINCO: a sample of the English enTenTen20 corpus
  • FinCORE: Finnish CORE corpus
Trained on Tested on Micro F1 Macro F1
X-GENRE EN-GINCO 0.688 0.691
X-GENRE FinCORE 0.674 0.581
GINCO EN-GINCO 0.632 0.502
FTD EN-GINCO 0.574 0.475
CORE EN-GINCO 0.485 0.422

At cross-dataset and cross-lingual experiments, it was shown that the X-GENRE classifier, trained on all three datasets, outperforms classifiers that were trained on just one of the datasets.

Fine-tuning hyperparameters

Fine-tuning was performed with simpletransformers. Beforehand, a brief hyperparameter optimization was performed and the presumed optimal hyperparameters are:

model_args= {
            "num_train_epochs": 15,
            "learning_rate": 1e-5,
            "max_seq_length": 512,
            }        
      

Citation

If you use the model, please cite the paper which describes creation of the X-GENRE dataset and the genre classifier:

@article{kuzman2023automatic,
  title={Automatic Genre Identification for Robust Enrichment of Massive Text Collections: Investigation of Classification Methods in the Era of Large Language Models},
  author={Kuzman, Taja and Mozeti{\v{c}}, Igor and Ljube{\v{s}}i{\'c}, Nikola},
  journal={Machine Learning and Knowledge Extraction},
  volume={5},
  number={3},
  pages={1149--1175},
  year={2023},
  publisher={MDPI}
}
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