United Arab Emirates

Word sense disambiguation (WSD) plays an important role, in increasing the performance of NLP applications such as information retrieval, question answering, and machine translation. The manual disambiguation process by humans is tedious, prone to errors, expensive, and time-consuming. Low-resource languages such as Amharic do not have WordNet which makes the WSD task challenging. Previous works try to identify and develop Amharic word sense disambiguation using different approaches but still, there are no easy and automatic WSD tools.  Recent research uses handcrafted rules or directly fetching the meaning of an ambiguous word from the synset list in WordNet, but did not learn different representations from data automatically.. 
For this study, we collect the WSD dataset and employ contextual embeddings, namely AmRoBERTa to automatically disambiguate words to their proper sense. We employ CNN, Bi-LSTM, and BERT for the classification task and attain 90\%, 88\%, and 93\%  accuracy respectively. Based on our findings, BERT has better accuracy results than others.
When we use the masking technique of the pre-trained contextual embedding to find the correct sense, it attains 70\textbackslash{}\% accuracy. However, when we use the pre-trained contextual model and glosses to disambiguate the correct sense with embedding similarity, it achieves 71\textbackslash{}\% accuracy. The main contributions of our work are the release of new datasets and exploring the use of pre-trained contextual embeddings for the Amharic word sense disambiguation model.

EMNLP 2022

Transfer Learning and Word Sense Disambiguation for Low-resource Language, the Case of Amharic

amharic word sense disambiguation.

natural language preprocessing

word sense disambiguation

transfer learning

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ACL-IJCNLP 2021

The great event is jointly organized by the Association for Computational Linguistics (ACL) and Asian Federation of Natural Language Processing (AFNLP).

workshop paper

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Gender subspace analysis, or using word vector representations to measure gender bias, is useful to study bias in machine learning models. However, direct application of gender subspace is challenging when the domain is shifted and when the size of a dataset is smaller. This study reports our qualitative and quantitative analyses of the learned gender subspace in a workplace communication dataset. We highlight how word sparsity and homonyms (i.e. words that have multiple semantic meaning) affect word embeddings, leading to degraded performance on subspace learning. We then propose word replacement and substitution to exclude non-gendered information from word embeddings in order to improve the robustness of gender subspace learned in domain-specific dataset for empirical gender bias analysis.

Boosting the Performance of Gender Subspace in Domain-Specific Gender Bias Analysis

Machine Translation (MT) is a sub-field of NLP that investigates how to use computer software to automatically translate text or speech from one language to another without human involvement. Nowadays, using deep neural networks for MT tasks has received a great deal of attention. This paper presents the first relatively large-scale Amharic-English parallel sentence dataset. Using these compiled data, we build bi-directional Amharic-English translation models by fine-tuning Facebook's multilingual pre-trained model achieving a BLEU score of 37.79 in Amharic-English translation and 32.74 in English-Amharic translation. Additionally, we explore the effects of Amharic homophone normalization on the MT task. The results show that normalization of Amharic homophone characters increases the performance of Amharic-English MT in both directions.

The Effect of Normalization for Bi-directional Amharic-English Neural Machine Translation

This paper presents an Amharic hate speech annotation using the Yandex Toloka crowdsourcing platform. The dataset is collected from 5 consecutive years 2018-2022, following some controversial events in Ethiopia that put the country in violence. We consider one-month data starting from the event date in each year. Accordingly, we annotate 5,400 tweets, nearly 1k tweets for each year. We explore the main challenges of crowdsourcing annotation for Amharic hate speech data collection using Toloka. We attain a Fleiss kappa score of 0.34 using three independent annotators that annotate the tweets where the gold label is determined using majority voting. Using the datasets, we build classification models using deep learning (LSTM and BiLSTM) and achieved a 0.49 F1-score for both models.  We will publicly release the dataset, source code, and models with a permissive license.

Challenges of Amharic Hate Speech Data Annotation Using Yandex Toloka Crowdsourcing Platform

In this work, we build a Question classification (QC) dataset from a social media platform, namely the Telegram public channel called @AskAnythingEthiopia. The platform allows asking questions that belong to various domains, like Politics, Music, Technology, Religion and so on. Questions are posted in Amharic, English, or Amharic in Latin script. Since the questions are posed in a mixed-code, we apply different strategies to pre-process the dataset. As part of the pre-processing tools, we build a Latin-to-Ethiopic-Script transliteration tool. We collect 8k Amharic and 24K Amharic but written in Latin script questions and develop deep learning-based question answering classifiers that attain an F-score of 57.79 in 20 different question categories. The datasets and pre-processing scripts are open-sourced to facilitate further research on the Amharic community-based question answering.

Question Answering Classification for Amharic Social Media Community Based Questions

In this ongoing work, we investigate a potential bias to associate terms related to ``female'' genitalia to reproduction, and terms related to ``male'' genitalia to sexual pleasure. While some of our suspicions are confirmed (stronger association of "female" genitalia to reproduction than to sexual pleasure), others are not (for example, our current data does not suggest a stronger association of reproduction to ``female'' genitalia than to ``male'' genitalia). We plan to continue this line of work by including more languages to get a better overview of the situation in languages other than English. Furthermore, we intend to critically assess cosine similarity as a proxy for association, as well as looking into (statistical) significance of the differences in cosine similarity that we found, and the effects of the skewed frequency distributions of the terms related to ``female'' and ``male'' genitals, and reproduction and sexual pleasure.

On Genitalia, Reproduction and Pleasure: Biases in the Representation of Sexes

Research writing can be technical and diffi- cult to understand. Manual assignments of re- search areas and related faculties can be time- consuming and error-prone. Therefore, the first goal of this project is to build an unsu- pervised model to classify an unseen project proposal. We explored unsupervised learning methods such as K-means and topic models as well as a combination of Latent Dirichlet Annotation (LDA), Bidirectional Encoder Rep- resentations from Transformers (BERT) and K-means to cluster project proposals into dif- ferent categories. The second goal is to recom- mend papers for particular project proposals based on other similar publications. We can as- sume that the authors of the closest papers can be suitable supervisors for the research project. We investigated different features that can be used as numerical vector representation of doc- uments and apply cosine similarity method to find matching pairs of paper and proposal. We found out that TF-IDF gives the most accurate results.

An Unsupervised Learning Approach for Categorising Research Proposals and Recommending Papers

The aim of this paper is present and regroup 70 research works that have been done for detecting Adverse Drug Events from social media. For each work, we focus on its description, its aim, its approach, the used models, the used datasets, its novelty and its limitation. We also add in the appendix part a table summarising all the studied works.

Detecting Adverse Drug Events from social media: A brief literature review

The gender bias present in the data on which language models are pre-trained gets reflected in the systems that use these models. The model's intrinsic gender bias shows an outdated and unequal view of women in our culture and encourages discrimination. Therefore, in order to establish more equitable systems and increase fairness, it is crucial to identify and mitigate the bias existing in these models. While there is a significant amount of work in this area in English, there is a dearth of research being done in other gendered and low resources languages, particularly the Indian languages. English is a non-gendered language, where it has genderless nouns. The methodologies for bias detection in English cannot be directly deployed in other gendered languages, where the syntax and semantics vary. In our paper, we measure gender bias associated with occupations in Hindi language models. Our major contributions in this paper are the construction of a novel corpus to evaluate occupational gender bias in Hindi and quantify this existing bias in these systems using a well-defined metric.

Evaluating Gender Bias in Pre-trained Indic Language Models

Despite recent advances in vision-and-language tasks, most progress is still focused on resource-rich languages such as English. Furthermore, widespread vision-and-language datasets directly adopt images representative of American or European cultures resulting in bias. Hence we introduce ParsVQA-Caps, the first benchmark in Persian for Visual Question Answering and Image Captioning tasks. We utilise two ways to collect datasets for each task, human-based and template-based for VQA and human-based and web-based for image captioning.

ParsVQA-Caps: A Benchmark for Visual Question Answering and Image Captioning in Persian

Social media platforms allow users to freely share their sentiments and opinions about is- sues and events or anything they feel like; however, they also make it easier to spread hate and abusive content. This paper introduces the HERDPhobia dataset, a manually annotated Twitter hate speech dataset against Fulani herders in Nigeria. The paper describes the data collection method, the annotation process, and the baseline experiment. We present a benchmark experiment using pre-trained languages models to classify the tweets as either hate speech or not hate speech, and the results were promising. We will release the dataset for further research in this direction.

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Boosting the Performance of Gender Subspace in Domain-Specific Gender Bias Analysis

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