Offline Handwritten Amharic Character Recognition Using Few-shot Learning

TL;DR

This paper applies few-shot learning to offline handwritten Amharic character recognition, introducing a novel data augmentation method and demonstrating its effectiveness with native language datasets.

Contribution

It is the first to implement few-shot learning for Amharic characters and proposes a new training episode augmentation technique based on alphabet structure.

Findings

Proposed method outperforms baseline prototypical networks.

Introduced a novel data augmentation approach leveraging Amharic alphabet structure.

First application of few-shot learning to Amharic handwritten characters.

Abstract

Few-shot learning is an important, but challenging problem of machine learning aimed at learning from only fewer labeled training examples. It has become an active area of research due to deep learning requiring huge amounts of labeled dataset, which is not feasible in the real world. Learning from a few examples is also an important attempt towards learning like humans. Few-shot learning has proven a very good promise in different areas of machine learning applications, particularly in image classification. As it is a recent technique, most researchers focus on understanding and solving the issues related to its concept by focusing only on common image datasets like Mini-ImageNet and Omniglot. Few-shot learning also opens an opportunity to address low resource languages like Amharic. In this study, offline handwritten Amharic character recognition using few-shot learning is addressed. Particularly, prototypical networks, the popular and simpler type of few-shot learning, is implemented as a baseline. Using the opportunities explored in the nature of Amharic alphabet having row-wise and column-wise similarities, a novel way of augmenting the training episodes is proposed. The experimental results show that the proposed method outperformed the baseline method. This study has implemented few-shot learning for Amharic characters for the first time. More importantly, the findings of the study open new ways of examining the influence of training episodes in few-shot learning, which is one of the important issues that needs exploration. The datasets used for this study are collected from native Amharic language writers using an Android App developed as a part of this study.