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In several Natural Language Processing (NLP) applications like news categorization, sentiment analysis, and subject labelling, text classification is a crucial and relevant task. The goal is to tag or label textual components like sentences, questions, paragraphs, and documents. In this era of massive information dissemination, manually processing and categorizing huge amounts of text data takes a relevant amount of time and effort. Text classification stands as a cornerstone within the realm of NLP, particularly when viewed through computer science and engineering. The past decade has seen deep learning revolutionize text classification, propelling advancements in text retrieval, categorization, information extraction, and summarization. The efficacy of text classification models relies heavily on their ability to capture intricate textual relationships and non-linear correlations, necessitating a comprehensive examination of the entire text classification pipeline.

This work integrates traditional and contemporary text mining methodologies, fostering a holistic understanding of text classification. In the NLP domain, numerous text representation techniques and model architectures have emerged, with Large Language Models (LLMs) and Generative pre-trained Transformers (GPTs) at the forefront. These models are adept at transforming extensive textual data into meaningful vector representations encapsulating semantic information. Text classification is multidisciplinary in nature, encompassing data mining, linguistics, and information retrieval.

This monograph provides an in-depth exploration of the text classification pipeline, with a particular emphasis on evaluating the impact of each component on the overall performance of text classification models. The pipeline includes state-of-the-art datasets, text preprocessing techniques, text representation methods, classification models, evaluation metrics, and future trends. Each section examines these stages, presenting technical innovations and recent findings. The work assesses various classification strategies, offering comparative analyses, examples and case studies. These contributions extend beyond a typical survey, providing a detailed and insightful exploration of the field.