History of Natural Language Processing (NLP): Natural Language Processing (NLP) has its roots in the early days of computing and linguistics. The history of NLP can be divided into several significant phases: 1. **1950s - The Dawn of NLP**: - Alan Turing's paper "Computing Machinery and Intelligence" (1950) introduced the concept of a machine's ability to process language, paving the way for NLP. - Early systems like ELIZA (1960s), a simple chatbot, demonstrated basic conversational abilities but relied heavily on pattern matching and rule-based programming. 2. **1960s-1970s - Rule-Based Systems**: - Systems were heavily dependent on hand-crafted rules and syntactic parsing. - Early machine translation efforts were developed, but they often produced poor results due to limited understanding of language semantics. 3. **1980s - Statistical NLP**: - A shift towards data-driven approaches occurred with the rise of statistical methods. - Techniques like Hidden Markov Models (HMM) and probabilistic context-free grammars became prominent. - NLP tasks like part-of-speech tagging and speech recognition saw significant improvements using these methods. 4. **1990s - Corpus-Based Approaches**: - Large corpora and annotated datasets became widely available, enabling supervised learning methods. - The Brown Corpus and Penn Treebank were among the datasets that advanced syntactic parsing and language modeling. 5. **2000s - The Neural Era**: - The introduction of neural networks revolutionized NLP tasks. - Word embeddings, such as Word2Vec and GloVe, created dense, continuous vector representations of words, capturing semantic relationships. 6. **2010s - The Transformer Revolution**: - The paper "Attention Is All You Need" (2017) introduced the Transformer architecture, which addressed the limitations of recurrent neural networks (RNNs). - Models like BERT (2018) and GPT (2019) set new benchmarks in NLP, enabling contextual understanding of text. 7. **2020s - Large Language Models and Beyond**: - OpenAI's GPT-3 (2020) and GPT-4 (2023) showcased the power of large-scale language models. - Multimodal models that combine text with images, audio, and other data types are being developed. - Research focuses on reducing bias, improving energy efficiency, and enhancing multilingual capabilities. Facts about NLP: 1. **Definition**: NLP stands for Natural Language Processing, a field of artificial intelligence (AI) focused on the interaction between computers and human languages. 2. **Key Areas**: - Text analysis - Sentiment analysis - Machine translation - Speech recognition - Information retrieval - Text summarization 3. **Origins**: NLP combines linguistics, computer science, and machine learning to process and analyze human language. 4. **Early Models**: Early NLP systems used rule-based approaches, including grammar rules and handcrafted algorithms. 5. **Data Representation**: - Bag-of-Words (BoW): Represents text as word frequency counts. - TF-IDF (Term Frequency-Inverse Document Frequency): Highlights important terms in a document relative to a corpus. - Word embeddings (e.g., Word2Vec, GloVe): Encodes words into dense vector spaces. 6. **Key Algorithms**: - Hidden Markov Models (HMM): Used for speech recognition and part-of-speech tagging. - Latent Dirichlet Allocation (LDA): A topic modeling technique. - Recurrent Neural Networks (RNNs) and Long Short-Term Memory (LSTMs): For sequence prediction in text and speech. 7. **Transformer Revolution**: - Transformers introduced in the paper "Attention Is All You Need" (2017) by Vaswani et al. - Models like BERT, GPT, and T5 are based on transformers. 8. **Pretrained Models**: - BERT (Bidirectional Encoder Representations from Transformers): Focused on bidirectional context. - GPT (Generative Pretrained Transformer): Generates human-like text. - RoBERTa, XLNet, T5, and others extend transformer architectures. 9. **Applications**: - Chatbots and virtual assistants (e.g., Siri, Alexa, Google Assistant) - Sentiment analysis in social media and reviews - Machine translation (e.g., Google Translate) - Spell and grammar checkers (e.g., Grammarly) - Document summarization (e.g., for news or research articles) 10. **Challenges**: - Ambiguity in language: Words and sentences can have multiple meanings. - Context understanding: Requires capturing long-range dependencies in text. - Multilingual processing: Developing models that work across languages. 11. **Tokenization**: Splits text into smaller units (words, subwords, or characters) for processing. 12. **Named Entity Recognition (NER)**: Identifies entities like names, dates, locations, and more in text. 13. **Sentiment Analysis**: Determines the emotional tone behind a body of text. 14. **Text-to-Speech (TTS) and Speech-to-Text (STT)**: Converts spoken language to text and vice versa. 15. **Text Augmentation**: Techniques like paraphrasing and word replacement help create synthetic data for training NLP models. 16. **Explainability**: Understanding how NLP models make decisions is an ongoing research area. 17. **Multimodal NLP**: Combines text with other data types (e.g., images, audio) to enrich applications like visual question answering. 18. **Ethics in NLP**: - Bias in language models can perpetuate stereotypes. - Misuse of models for generating harmful or misleading content. - Data privacy concerns when processing sensitive text. 19. **Libraries and Frameworks**: - NLTK (Natural Language Toolkit): Early NLP library. - spaCy: Industrial-strength NLP library. - Hugging Face Transformers: Popular library for transformer models. - Gensim: Specializes in topic modeling and word embeddings. 20. **Evaluation Metrics**: - BLEU (Bilingual Evaluation Understudy): For machine translation quality. - ROUGE (Recall-Oriented Understudy for Gisting Evaluation): For summarization tasks. - Perplexity: For evaluating language models. 21. **Open Datasets**: - Wikipedia, Common Crawl, and OpenWebText: Large corpora for training. - SQuAD (Stanford Question Answering Dataset): Benchmark for Q&A systems. - IMDB, Yelp, and Amazon Reviews: Used for sentiment analysis. 22. **Advances in 2023**: - Emergence of multi-task and multimodal models. - Continuous pretraining for adapting large models to new domains. - Focus on reducing computational costs of large language models (LLMs). 23. **Zero-shot and Few-shot Learning**: - Zero-shot: Models handle tasks without task-specific training. - Few-shot: Models perform tasks after seeing only a few examples. 24. **Prompt Engineering**: Crafting prompts to get desired outputs from large language models. 25. **Transfer Learning**: Using pretrained models and fine-tuning them for specific tasks. 26. **Context Window Limitations**: Models like GPT have limits on how much text they can process in one go. 27. **Real-Time NLP**: Applied in systems like live transcription and real-time chat moderation. 28. **Sentiment Lexicons**: Dictionaries (e.g., AFINN, VADER) containing words with associated sentiment scores. 29. **Evolution from RNNs to Transformers**: Transformers replaced RNNs in most NLP tasks due to better scalability and parallelism. 30. **Future of NLP**: - Better multilingual and cross-lingual capabilities. - Integration with knowledge graphs for factual accuracy. - More energy-efficient models. 31. NLP is used extensively in customer support to create AI-powered chatbots. 32. Sequence-to-sequence models are common in machine translation tasks. 33. Text embeddings like BERT provide context-aware representations of words. 34. Word sense disambiguation is a challenge in NLP that focuses on determining the correct meaning of a word in context. 35. Part-of-speech tagging assigns grammatical categories to words in a sentence. 36. Dependency parsing analyzes grammatical structures by identifying relationships between words. 37. Stemming and lemmatization reduce words to their root or base form. 38. Large language models can hallucinate facts, presenting incorrect information as true. 39. Neural Machine Translation (NMT) surpasses traditional statistical methods in translation accuracy. 40. Pretraining on large datasets helps reduce the need for task-specific labeled data. 41. Adapters allow large pretrained models to be fine-tuned efficiently on multiple tasks. 42. Text classification is used in spam detection, topic identification, and sentiment analysis. 43. Automatic text summarization can be extractive or abstractive. 44. Open-domain question answering systems retrieve answers from a wide range of knowledge bases. 45. Semantic search improves traditional search engines by understanding query intent. 46. Knowledge graphs are integrated with NLP for tasks like entity linking. 47. Contextual embeddings outperform static embeddings by considering word usage in context. 48. Co-reference resolution identifies all expressions in a text referring to the same entity. 49. GPT-4 and similar models are examples of generative pre-trained transformers. 50. NLP is a crucial component in AI for human-computer interaction systems. 51. Ethical NLP focuses on creating fair, unbiased, and inclusive AI systems. 52. NLP can analyze emotions in text, enabling sentiment-driven applications. 53. Aspect-based sentiment analysis examines sentiment directed at specific entities or topics. 54. Many NLP tasks are now benchmarked using datasets like GLUE and SuperGLUE. 55. Few-shot and zero-shot NLP capabilities have enabled rapid development of new applications. 56. Multilingual NLP models like mBERT support multiple languages in a single framework. 57. Fine-grained sentiment analysis provides more nuanced emotional insights. 58. Cross-lingual transfer learning allows models trained in one language to generalize to others. 59. Semi-supervised and unsupervised learning are increasingly used in NLP due to data scarcity. 60. NLP is used in digital forensics to analyze text data in criminal investigations. Natural language processing (NLP) is a subfield of computer science and especially artificial intelligence. It is primarily concerned with providing computers with the ability to process data encoded in natural language and is thus closely related to information retrieval, knowledge representation and computational linguistics, a subfield of linguistics. Typically data is collected in text corpora, using either rule-based, statistical or neural-based approaches in machine learning and deep learning. Major tasks in natural language processing are speech recognition, text classification, natural-language understanding, and natural-language generation. History Further information: History of natural language processing Natural language processing has its roots in the 1950s.[1] Already in 1950, Alan Turing published an article titled "Computing Machinery and Intelligence" which proposed what is now called the Turing test as a criterion of intelligence, though at the time that was not articulated as a problem separate from artificial intelligence. The proposed test includes a task that involves the automated interpretation and generation of natural language. Symbolic NLP (1950s – early 1990s) The premise of symbolic NLP is well-summarized by John Searle's Chinese room experiment: Given a collection of rules (e.g., a Chinese phrasebook, with questions and matching answers), the computer emulates natural language understanding (or other NLP tasks) by applying those rules to the data it confronts. 1950s: The Georgetown experiment in 1954 involved fully automatic translation of more than sixty Russian sentences into English. The authors claimed that within three or five years, machine translation would be a solved problem.[2] However, real progress was much slower, and after the ALPAC report in 1966, which found that ten years of research had failed to fulfill the expectations, funding for machine translation was dramatically reduced. Little further research in machine translation was conducted in America (though some research continued elsewhere, such as Japan and Europe[3]) until the late 1980s when the first statistical machine translation systems were developed. 1960s: Some notably successful natural language processing systems developed in the 1960s were SHRDLU, a natural language system working in restricted "blocks worlds" with restricted vocabularies, and ELIZA, a simulation of a Rogerian psychotherapist, written by Joseph Weizenbaum between 1964 and 1966. Using almost no information about human thought or emotion, ELIZA sometimes provided a startlingly human-like interaction. When the "patient" exceeded the very small knowledge base, ELIZA might provide a generic response, for example, responding to "My head hurts" with "Why do you say your head hurts?". Ross Quillian's successful work on natural language was demonstrated with a vocabulary of only twenty words, because that was all that would fit in a computer memory at the time.[4] 1970s: During the 1970s, many programmers began to write "conceptual ontologies", which structured real-world information into computer-understandable data. Examples are MARGIE (Schank, 1975), SAM (Cullingford, 1978), PAM (Wilensky, 1978), TaleSpin (Meehan, 1976), QUALM (Lehnert, 1977), Politics (Carbonell, 1979), and Plot Units (Lehnert 1981). During this time, the first chatterbots were written (e.g., PARRY). 1980s: The 1980s and early 1990s mark the heyday of symbolic methods in NLP. Focus areas of the time included research on rule-based parsing (e.g., the development of HPSG as a computational operationalization of generative grammar), morphology (e.g., two-level morphology[5]), semantics (e.g., Lesk algorithm), reference (e.g., within Centering Theory[6]) and other areas of natural language understanding (e.g., in the Rhetorical Structure Theory). Other lines of research were continued, e.g., the development of chatterbots with Racter and Jabberwacky. An important development (that eventually led to the statistical turn in the 1990s) was the rising importance of quantitative evaluation in this period.[7] Statistical NLP (1990s–2010s) Up until the 1980s, most natural language processing systems were based on complex sets of hand-written rules. Starting in the late 1980s, however, there was a revolution in natural language processing with the introduction of machine learning algorithms for language processing. This was due to both the steady increase in computational power (see Moore's law) and the gradual lessening of the dominance of Chomskyan theories of linguistics (e.g. transformational grammar), whose theoretical underpinnings discouraged the sort of corpus linguistics that underlies the machine-learning approach to language processing.[8] 1990s: Many of the notable early successes in statistical methods in NLP occurred in the field of machine translation, due especially to work at IBM Research, such as IBM alignment models. These systems were able to take advantage of existing multilingual textual corpora that had been produced by the Parliament of Canada and the European Union as a result of laws calling for the translation of all governmental proceedings into all official languages of the corresponding systems of government. However, most other systems depended on corpora specifically developed for the tasks implemented by these systems, which was (and often continues to be) a major limitation in the success of these systems. As a result, a great deal of research has gone into methods of more effectively learning from limited amounts of data. 2000s: With the growth of the web, increasing amounts of raw (unannotated) language data have become available since the mid-1990s. Research has thus increasingly focused on unsupervised and semi-supervised learning algorithms. Such algorithms can learn from data that has not been hand-annotated with the desired answers or using a combination of annotated and non-annotated data. Generally, this task is much more difficult than supervised learning, and typically produces less accurate results for a given amount of input data. However, there is an enormous amount of non-annotated data available (including, among other things, the entire content of the World Wide Web), which can often make up for the inferior results if the algorithm used has a low enough time complexity to be practical. Neural NLP (present) In 2003, word n-gram model, at the time the best statistical algorithm, was outperformed by a multi-layer perceptron (with a single hidden layer and context length of several words trained on up to 14 million of words with a CPU cluster in language modelling) by Yoshua Bengio with co-authors.[9] In 2010, Tomáš Mikolov (then a PhD student at Brno University of Technology) with co-authors applied a simple recurrent neural network with a single hidden layer to language modelling,[10] and in the following years he went on to develop Word2vec. In the 2010s, representation learning and deep neural network-style (featuring many hidden layers) machine learning methods became widespread in natural language processing. That popularity was due partly to a flurry of results showing that such techniques[11][12] can achieve state-of-the-art results in many natural language tasks, e.g., in language modeling[13] and parsing.[14][15] This is increasingly important in medicine and healthcare, where NLP helps analyze notes and text in electronic health records that would otherwise be inaccessible for study when seeking to improve care[16] or protect patient privacy.[17] Approaches: Symbolic, statistical, neural networks Symbolic approach, i.e., the hand-coding of a set of rules for manipulating symbols, coupled with a dictionary lookup, was historically the first approach used both by AI in general and by NLP in particular:[18][19] such as by writing grammars or devising heuristic rules for stemming. Machine learning approaches, which include both statistical and neural networks, on the other hand, have many advantages over the symbolic approach: both statistical and neural networks methods can focus more on the most common cases extracted from a corpus of texts, whereas the rule-based approach needs to provide rules for both rare cases and common ones equally. language models, produced by either statistical or neural networks methods, are more robust to both unfamiliar (e.g. containing words or structures that have not been seen before) and erroneous input (e.g. with misspelled words or words accidentally omitted) in comparison to the rule-based systems, which are also more costly to produce. the larger such a (probabilistic) language model is, the more accurate it becomes, in contrast to rule-based systems that can gain accuracy only by increasing the amount and complexity of the rules leading to intractability problems. Although rule-based systems for manipulating symbols were still in use in 2020, they have become mostly obsolete with the advance of LLMs in 2023. Before that they were commonly used: when the amount of training data is insufficient to successfully apply machine learning methods, e.g., for the machine translation of low-resource languages such as provided by the Apertium system, for preprocessing in NLP pipelines, e.g., tokenization, or for postprocessing and transforming the output of NLP pipelines, e.g., for knowledge extraction from syntactic parses. Statistical approach In the late 1980s and mid-1990s, the statistical approach ended a period of AI winter, which was caused by the inefficiencies of the rule-based approaches.[20][21] The earliest decision trees, producing systems of hard if–then rules, were still very similar to the old rule-based approaches. Only the introduction of hidden Markov models, applied to part-of-speech tagging, announced the end of the old rule-based approach. Neural networks Further information: Artificial neural network A major drawback of statistical methods is that they require elaborate feature engineering. Since 2015,[22] the statistical approach has been replaced by the neural networks approach, using semantic networks[23] and word embeddings to capture semantic properties of words. Intermediate tasks (e.g., part-of-speech tagging and dependency parsing) are not needed anymore. Neural machine translation, based on then-newly invented sequence-to-sequence transformations, made obsolete the intermediate steps, such as word alignment, previously necessary for statistical machine translation. Common NLP tasks The following is a list of some of the most commonly researched tasks in natural language processing. Some of these tasks have direct real-world applications, while others more commonly serve as subtasks that are used to aid in solving larger tasks. Though natural language processing tasks are closely intertwined, they can be subdivided into categories for convenience. A coarse division is given below. Text and speech processing Optical character recognition (OCR) Given an image representing printed text, determine the corresponding text. Speech recognition Given a sound clip of a person or people speaking, determine the textual representation of the speech. This is the opposite of text to speech and is one of the extremely difficult problems colloquially termed "AI-complete" (see above). In natural speech there are hardly any pauses between successive words, and thus speech segmentation is a necessary subtask of speech recognition (see below). In most spoken languages, the sounds representing successive letters blend into each other in a process termed coarticulation, so the conversion of the analog signal to discrete characters can be a very difficult process. Also, given that words in the same language are spoken by people with different accents, the speech recognition software must be able to recognize the wide variety of input as being identical to each other in terms of its textual equivalent. Speech segmentation Given a sound clip of a person or people speaking, separate it into words. A subtask of speech recognition and typically grouped with it. Text-to-speech Given a text, transform those units and produce a spoken representation. Text-to-speech can be used to aid the visually impaired.[24] Word segmentation (Tokenization) Tokenization is a process used in text analysis that divides text into individual words or word fragments. This technique results in two key components: a word index and tokenized text. The word index is a list that maps unique words to specific numerical identifiers, and the tokenized text replaces each word with its corresponding numerical token. These numerical tokens are then used in various deep learning methods.[25] For a language like English, this is fairly trivial, since words are usually separated by spaces. However, some written languages like Chinese, Japanese and Thai do not mark word boundaries in such a fashion, and in those languages text segmentation is a significant task requiring knowledge of the vocabulary and morphology of words in the language. Sometimes this process is also used in cases like bag of words (BOW) creation in data mining.[citation needed] Morphological analysis Lemmatization The task of removing inflectional endings only and to return the base dictionary form of a word which is also known as a lemma. Lemmatization is another technique for reducing words to their normalized form. But in this case, the transformation actually uses a dictionary to map words to their actual form.[26] Morphological segmentation Separate words into individual morphemes and identify the class of the morphemes. The difficulty of this task depends greatly on the complexity of the morphology (i.e., the structure of words) of the language being considered. English has fairly simple morphology, especially inflectional morphology, and thus it is often possible to ignore this task entirely and simply model all possible forms of a word (e.g., "open, opens, opened, opening") as separate words. In languages such as Turkish or Meitei, a highly agglutinated Indian language, however, such an approach is not possible, as each dictionary entry has thousands of possible word forms.[27] Part-of-speech tagging Given a sentence, determine the part of speech (POS) for each word. Many words, especially common ones, can serve as multiple parts of speech. For example, "book" can be a noun ("the book on the table") or verb ("to book a flight"); "set" can be a noun, verb or adjective; and "out" can be any of at least five different parts of speech. Stemming The process of reducing inflected (or sometimes derived) words to a base form (e.g., "close" will be the root for "closed", "closing", "close", "closer" etc.). Stemming yields similar results as lemmatization, but does so on grounds of rules, not a dictionary. Syntactic analysis Part of a series on Formal languages Key concepts Formal system Alphabet Syntax Semantics (logic) Semantics (programming languages) Formal grammar Formation rule Well-formed formula Automata theory Regular expression Production Ground expression Atomic formula Applications vte Grammar induction[28] Generate a formal grammar that describes a language's syntax. Sentence breaking (also known as "sentence boundary disambiguation") Given a chunk of text, find the sentence boundaries. Sentence boundaries are often marked by periods or other punctuation marks, but these same characters can serve other purposes (e.g., marking abbreviations). Parsing Determine the parse tree (grammatical analysis) of a given sentence. The grammar for natural languages is ambiguous and typical sentences have multiple possible analyses: perhaps surprisingly, for a typical sentence there may be thousands of potential parses (most of which will seem completely nonsensical to a human). There are two primary types of parsing: dependency parsing and constituency parsing. Dependency parsing focuses on the relationships between words in a sentence (marking things like primary objects and predicates), whereas constituency parsing focuses on building out the parse tree using a probabilistic context-free grammar (PCFG) (see also stochastic grammar). Lexical semantics (of individual words in context) Lexical semantics What is the computational meaning of individual words in context? Distributional semantics How can we learn semantic representations from data? Named entity recognition (NER) Given a stream of text, determine which items in the text map to proper names, such as people or places, and what the type of each such name is (e.g. person, location, organization). Although capitalization can aid in recognizing named entities in languages such as English, this information cannot aid in determining the type of named entity, and in any case, is often inaccurate or insufficient. For example, the first letter of a sentence is also capitalized, and named entities often span several words, only some of which are capitalized. Furthermore, many other languages in non-Western scripts (e.g. Chinese or Arabic) do not have any capitalization at all, and even languages with capitalization may not consistently use it to distinguish names. For example, German capitalizes all nouns, regardless of whether they are names, and French and Spanish do not capitalize names that serve as adjectives. Another name for this task is token classification.[29] Sentiment analysis (see also Multimodal sentiment analysis) Sentiment analysis is a computational method used to identify and classify the emotional intent behind text. This technique involves analyzing text to determine whether the expressed sentiment is positive, negative, or neutral. Models for sentiment classification typically utilize inputs such as word n-grams, Term Frequency-Inverse Document Frequency (TF-IDF) features, hand-generated features, or employ deep learning models designed to recognize both long-term and short-term dependencies in text sequences. The applications of sentiment analysis are diverse, extending to tasks such as categorizing customer reviews on various online platforms.[25] Terminology extraction The goal of terminology extraction is to automatically extract relevant terms from a given corpus. Word-sense disambiguation (WSD) Many words have more than one meaning; we have to select the meaning which makes the most sense in context. For this problem, we are typically given a list of words and associated word senses, e.g. from a dictionary or an online resource such as WordNet. Entity linking Many words—typically proper names—refer to named entities; here we have to select the entity (a famous individual, a location, a company, etc.) which is referred to in context. Relational semantics (semantics of individual sentences) Relationship extraction Given a chunk of text, identify the relationships among named entities (e.g. who is married to whom). Semantic parsing Given a piece of text (typically a sentence), produce a formal representation of its semantics, either as a graph (e.g., in AMR parsing) or in accordance with a logical formalism (e.g., in DRT parsing). This challenge typically includes aspects of several more elementary NLP tasks from semantics (e.g., semantic role labelling, word-sense disambiguation) and can be extended to include full-fledged discourse analysis (e.g., discourse analysis, coreference; see Natural language understanding below). Semantic role labelling (see also implicit semantic role labelling below) Given a single sentence, identify and disambiguate semantic predicates (e.g., verbal frames), then identify and classify the frame elements (semantic roles). Discourse (semantics beyond individual sentences) Coreference resolution Given a sentence or larger chunk of text, determine which words ("mentions") refer to the same objects ("entities"). Anaphora resolution is a specific example of this task, and is specifically concerned with matching up pronouns with the nouns or names to which they refer. The more general task of coreference resolution also includes identifying so-called "bridging relationships" involving referring expressions. For example, in a sentence such as "He entered John's house through the front door", "the front door" is a referring expression and the bridging relationship to be identified is the fact that the door being referred to is the front door of John's house (rather than of some other structure that might also be referred to). Discourse analysis This rubric includes several related tasks. One task is discourse parsing, i.e., identifying the discourse structure of a connected text, i.e. the nature of the discourse relationships between sentences (e.g. elaboration, explanation, contrast). Another possible task is recognizing and classifying the speech acts in a chunk of text (e.g. yes–no question, content question, statement, assertion, etc.). Implicit semantic role labelling Given a single sentence, identify and disambiguate semantic predicates (e.g., verbal frames) and their explicit semantic roles in the current sentence (see Semantic role labelling above). Then, identify semantic roles that are not explicitly realized in the current sentence, classify them into arguments that are explicitly realized elsewhere in the text and those that are not specified, and resolve the former against the local text. A closely related task is zero anaphora resolution, i.e., the extension of coreference resolution to pro-drop languages. Recognizing textual entailment Given two text fragments, determine if one being true entails the other, entails the other's negation, or allows the other to be either true or false.[30] Topic segmentation and recognition Given a chunk of text, separate it into segments each of which is devoted to a topic, and identify the topic of the segment. Argument mining The goal of argument mining is the automatic extraction and identification of argumentative structures from natural language text with the aid of computer programs.[31] Such argumentative structures include the premise, conclusions, the argument scheme and the relationship between the main and subsidiary argument, or the main and counter-argument within discourse.[32][33] Higher-level NLP applications Automatic summarization (text summarization) Produce a readable summary of a chunk of text. Often used to provide summaries of the text of a known type, such as research papers, articles in the financial section of a newspaper. Grammatical error correction Grammatical error detection and correction involves a great band-width of problems on all levels of linguistic analysis (phonology/orthography, morphology, syntax, semantics, pragmatics). Grammatical error correction is impactful since it affects hundreds of millions of people that use or acquire English as a second language. It has thus been subject to a number of shared tasks since 2011.[34][35][36] As far as orthography, morphology, syntax and certain aspects of semantics are concerned, and due to the development of powerful neural language models such as GPT-2, this can now (2019) be considered a largely solved problem and is being marketed in various commercial applications. Logic translation Translate a text from a natural language into formal logic. Machine translation (MT) Automatically translate text from one human language to another. This is one of the most difficult problems, and is a member of a class of problems colloquially termed "AI-complete", i.e. requiring all of the different types of knowledge that humans possess (grammar, semantics, facts about the real world, etc.) to solve properly. Natural-language understanding (NLU) Convert chunks of text into more formal representations such as first-order logic structures that are easier for computer programs to manipulate. Natural language understanding involves the identification of the intended semantic from the multiple possible semantics which can be derived from a natural language expression which usually takes the form of organized notations of natural language concepts. Introduction and creation of language metamodel and ontology are efficient however empirical solutions. An explicit formalization of natural language semantics without confusions with implicit assumptions such as closed-world assumption (CWA) vs. open-world assumption, or subjective Yes/No vs. objective True/False is expected for the construction of a basis of semantics formalization.[37] Natural-language generation (NLG): Convert information from computer databases or semantic intents into readable human language. Book generation Not an NLP task proper but an extension of natural language generation and other NLP tasks is the creation of full-fledged books. The first machine-generated book was created by a rule-based system in 1984 (Racter, The policeman's beard is half-constructed).[38] The first published work by a neural network was published in 2018, 1 the Road, marketed as a novel, contains sixty million words. Both these systems are basically elaborate but non-sensical (semantics-free) language models. The first machine-generated science book was published in 2019 (Beta Writer, Lithium-Ion Batteries, Springer, Cham).[39] Unlike Racter and 1 the Road, this is grounded on factual knowledge and based on text summarization. Document AI A Document AI platform sits on top of the NLP technology enabling users with no prior experience of artificial intelligence, machine learning or NLP to quickly train a computer to extract the specific data they need from different document types. NLP-powered Document AI enables non-technical teams to quickly access information hidden in documents, for example, lawyers, business analysts and accountants.[40] Dialogue management Computer systems intended to converse with a human. Question answering Given a human-language question, determine its answer. Typical questions have a specific right answer (such as "What is the capital of Canada?"), but sometimes open-ended questions are also considered (such as "What is the meaning of life?"). Text-to-image generation Given a description of an image, generate an image that matches the description.[41] Text-to-scene generation Given a description of a scene, generate a 3D model of the scene.[42][43] Text-to-video Given a description of a video, generate a video that matches the description.[44][45] General tendencies and (possible) future directions Based on long-standing trends in the field, it is possible to extrapolate future directions of NLP. As of 2020, three trends among the topics of the long-standing series of CoNLL Shared Tasks can be observed:[46] Interest on increasingly abstract, "cognitive" aspects of natural language (1999–2001: shallow parsing, 2002–03: named entity recognition, 2006–09/2017–18: dependency syntax, 2004–05/2008–09 semantic role labelling, 2011–12 coreference, 2015–16: discourse parsing, 2019: semantic parsing). Increasing interest in multilinguality, and, potentially, multimodality (English since 1999; Spanish, Dutch since 2002; German since 2003; Bulgarian, Danish, Japanese, Portuguese, Slovenian, Swedish, Turkish since 2006; Basque, Catalan, Chinese, Greek, Hungarian, Italian, Turkish since 2007; Czech since 2009; Arabic since 2012; 2017: 40+ languages; 2018: 60+/100+ languages) Elimination of symbolic representations (rule-based over supervised towards weakly supervised methods, representation learning and end-to-end systems) Cognition Most higher-level NLP applications involve aspects that emulate intelligent behaviour and apparent comprehension of natural language. More broadly speaking, the technical operationalization of increasingly advanced aspects of cognitive behaviour represents one of the developmental trajectories of NLP (see trends among CoNLL shared tasks above). Cognition refers to "the mental action or process of acquiring knowledge and understanding through thought, experience, and the senses."[47] Cognitive science is the interdisciplinary, scientific study of the mind and its processes.[48] Cognitive linguistics is an interdisciplinary branch of linguistics, combining knowledge and research from both psychology and linguistics.[49] Especially during the age of symbolic NLP, the area of computational linguistics maintained strong ties with cognitive studies. As an example, George Lakoff offers a methodology to build natural language processing (NLP) algorithms through the perspective of cognitive science, along with the findings of cognitive linguistics,[50] with two defining aspects: Apply the theory of conceptual metaphor, explained by Lakoff as "the understanding of one idea, in terms of another" which provides an idea of the intent of the author.[51] For example, consider the English word big. When used in a comparison ("That is a big tree"), the author's intent is to imply that the tree is physically large relative to other trees or the authors experience. When used metaphorically ("Tomorrow is a big day"), the author's intent to imply importance. The intent behind other usages, like in "She is a big person", will remain somewhat ambiguous to a person and a cognitive NLP algorithm alike without additional information. Assign relative measures of meaning to a word, phrase, sentence or piece of text based on the information presented before and after the piece of text being analyzed, e.g., by means of a probabilistic context-free grammar (PCFG). The mathematical equation for such algorithms is presented in US Patent 9269353:[52] R M M ( t o k e n N ) = P M M ( t o k e n N ) × 1 2 d ( ∑ i = − d d ( ( P M M ( t o k e n N ) × P F ( t o k e n N − i , t o k e n N , t o k e n N + i ) ) i ) {\displaystyle {RMM(token_{N})}={PMM(token_{N})}\times {\frac {1}{2d}}\left(\sum _{i=-d}^{d}{((PMM(token_{N})}\times {PF(token_{N-i},token_{N},token_{N+i}))_{i}}\right)} Where RMM is the relative measure of meaning token is any block of text, sentence, phrase or word N is the number of tokens being analyzed PMM is the probable measure of meaning based on a corpora d is the non zero location of the token along the sequence of N tokens PF is the probability function specific to a language Ties with cognitive linguistics are part of the historical heritage of NLP, but they have been less frequently addressed since the statistical turn during the 1990s. Nevertheless, approaches to develop cognitive models towards technically operationalizable frameworks have been pursued in the context of various frameworks, e.g., of cognitive grammar,[53] functional grammar,[54] construction grammar,[55] computational psycholinguistics and cognitive neuroscience (e.g., ACT-R), however, with limited uptake in mainstream NLP (as measured by presence on major conferences[56] of the ACL). More recently, ideas of cognitive NLP have been revived as an approach to achieve explainability, e.g., under the notion of "cognitive AI".[57] Likewise, ideas of cognitive NLP are inherent to neural models multimodal NLP (although rarely made explicit)[58] and developments in artificial intelligence, specifically tools and technologies using large language model approaches[59] and new directions in artificial general intelligence based on the free energy principle[60] by British neuroscientist and theoretician at University College London Karl J. Friston.