Basics of Natural Language Processing
We don’t even notice all the ways Natural Language Processing is present in our daily lives. If you think about it, Natural Language Processing is present in:
- Voice recognition in our smartphones
- Translation of the pages in foreign languages
- Customer Support Chatbots in eCommerce stores
- Spam filters in our email inboxes
- Report generation in our analytics tools
NLP is one of the integral elements of the business processes because it automates the interpretation of business intelligence and streamlines the operation.
In this introduction to Natural Language Processing, we will explain, what it is all about, how it works and its role in the modern world.
Natural Language Processing (aka NLP) is a field of computer science, Artificial Intelligence focused on the ability of the machines to comprehend language and interpret messages.
We can define NLP as a set of algorithms designed to explore, recognize, and utilize text-based information and identify insights for the benefit of the business operation.
As such, natural language processing and generation algorithms form a backbone for the majority of automated processes.
NLP gives the computer the skills to:
- understand informally written queries;
- extract the meaning out of it;
- generate the responses of its own;
- perform requested tasks.
The global task of NLP is streamlining the interaction between human operators and machines via more flexible conversational interfaces.
The NLP brings several value-added benefits to the table:
- Insights into the content of the text (what is this text about?)
- Exploration of the context of the message (Why, when, where, how it is about?)
- Identification of the opportunities (facts, intents, sentiments) behind the message or “reading between the lines.”
To continue our NLP introduction we should say about the roots of NLP technology, which go back into the times of the Cold War. The first practical application of Natural Language Processing was the translation of the messages from Russian to English to understand what the commies were at. The results were lackluster, but it was a step in the right direction. It took decades before the computers became powerful enough to handle NLP operations. You may check out current business applications of NLP in our article.
For a while, the major issue with NLP applications was flexibility. Long story short: early NLP software was stiff and not very practical. There was always something sore sticking out and breaking the game because language is complex and there is much going behind the words that were beyond the algorithm’s reach. Because of that, the algorithms required a lot of oversight and close attention to the details.
However, with the emergence of big data and machine learning algorithms, the task of fine-tuning and training Natural Language Processing models became less of an undertaking and more of a routine job.
In essence, Natural Language Processing is all about providing tools to enable the machine’s comprehension of language on a deeper level than straightforward commands.
This means the NLP models deal with a variety of different aspects of language, including:
- Semantics – relations between words, sentences, paragraphs, and so on
- Morphology – structure, and content of word forms
- Phonology – a sound organization of words
- Syntax – structural governance of the texts
- Pragmatics – the way context contributes to meaning
The whole procedure involves the following steps:
- The text is segmented into meaningful bits (topics, sentences, paragraphs, etc.)
- Bag of words – counts words and their occurrences throughout the text.
- After that, the words in the sentences are split apart. This process is called tokenization;
- Then Parts of speech are tagged through the body of text
- Term Frequency-Inverse Document Frequency (TF-IDF) – determines the importance of certain words in a corpus.
- This process is continued with Named Entity Recognition which finds specific words that are names (people’s or company’s names, job titles, locations, product names, events, number figures, and others) or are related to them.
- Next goes Stop Words Removal – this process removes the everyday language stuff like pronouns and prepositions. This process can be referred to as cleaning the text from irrelevant or noisy material. Stop words may also include anything deemed inconsequential for the particular use case.
- The next step is Stemming – the process of separating the affixes from the words and extracting the root of the word. This includes prefixes (as in “biochemistry) and suffixes (as in “laughable”).
- Then goes Lemmatization – the process of reducing the words to their base form and finding the variations of the word to form a distinct group. This includes the transformation of the words from one part of speech (as in the noun “walk” to the verb “walking”) to another or transformation from one time to another (from the present “write” to past “wrote”).
- After that, the algorithm figures out how the words relate to each other. This process is called Dependency Parsing.
- Topic modeling is applied to discover hidden structures or patterns in the text. The process involves text clustering into meaningful bits. The method also includes text chunking, which identifies the constituent parts of the sentence and the relations between the elements
That’s how an algorithm is capable of comprehending the text.
Because of the sheer volume of the information to be processed – NLP involves a combination of supervised and unsupervised machine learning algorithms. At first, the process involves clustering – exploring the texts and their content, then the procedure involves classification – sorting out the specific elements.
The models are trained on datasets (known as corpora) that include a lot of different examples of language use related to the use case requirements. The analysis of the text creates something of a map with the general layout, which, in turn, serves as a matrix through which the input text is understood.
For example, the translation algorithm is trained on a corpus of text and its counterpart in another language. Then the whole thing is augmented on each side with the accompanying vocabulary layout, which includes synonyms, semantics, and other supplementary material.
Overall, Natural Language Processing consists of two basic divisions:
- Natural Language Understanding
- Natural Language Generation
Natural Language Understanding is the analytical branch of Natural Language Processing. It is all about analyzing the contents of the text and understanding its insights.
Comprehension is the key element of NLP. The thing is – language is an ambiguous and multi-pronged beast. The meaning of the message depends on the context it is expressed in and other factors that address the purpose of the message.
To take these factors into the equation make the algorithm capable of getting the true meaning of the message – different techniques are used to deconstruct and analyze the text.
That’s what Natural Language Understanding (AKA Natural Language Interpretation) deals with. It lays the foundation for further proceedings.
NLU is a subdivision of data mining (you can read about it right here) that deals with textual content. As such, it is used prominently in the majority of data science operations. It is everywhere – from the spam filters to the grammar checks.
Natural Language Understanding involves
- processing the text (i.e., structuring a piece of unstructured data)
- analyzing its content to extract insights of relevance (for example, names mentioned in the article or figures related to market growth)
- subsequently preparing it for some utilization (for example, to generate custom responses).
NLU is applied in the text classification.
Natural Language Generation is the operational branch of NLP. In strict terms, NLG can be described as:
- creation of the custom messages
- with the information that is relevant to the query (telling the time when asked “what time is it?”)
- in a form appropriate to the context of the query (answer to the question, summarization of the text, and so on).
Natural Language Generation is built on the foundation of Natural Language Understanding. In broad terms, the effectiveness of the generative model depends on the quality and precision of the applied analysis. This means – it is not a good idea to use NLP Model trained on Shakespeare’s sonnets to generate medical bills.
The generative procedure involves the following steps:
- An algorithm determines what information must be generated into text.
- This includes determining the solid and fluid elements, i.e., parts of the text that must be included unchanged (relevant terms, names, figures, etc.) and pieces of the book that can be transformed depending on the context).
- Then the message is organized into the appropriate structure. The structure can be casual (plain narrative sentence), or it can be formalized (for example, as a list)
- In the case of voice synthesis – uses a prosody model, which determines breaks, duration, and pitch. Then, using a speech database (recordings from a voice actor), the engine puts together all the recorded phonemes to form one coherent string of speech.
Two basic challenges occur during the development of NLP models. Both of them are directly related to the preeminent features of the natural language. These are:
- Natural Language is irregular and ambiguous. There are many different words with numerous alternative uses.
- Natural Language structures are mutable and therefore complicated. Various phrase types can be formed out of the same bag of words.
This creates a problem for NLP as it is unable to comprehend the real meaning of the text. Misinterpretations pile up, and this manifests itself in incorrect, unusable results.
The solution for these challenges lies in more in-depth and more thorough corpus analysis.
- The parsing mechanism must be able to explore various syntactic arrangements for phrases and be able to backtrack and rearrange them whenever necessary
- Grammars must contain large libraries of relevant expressions to improve the precision of the checking. This way, the anomalies are easier to detect.
- Grammatical rules must be tuned to detect inconsistencies in the structure and word use.
Natural language processing helps computers communicate with humans in their language and scales other language-related tasks. For example, NLP makes it possible for computers to read the text, hear the speech, interpret it, measure sentiment, and determine which parts are essential.
Today’s machines can analyze more language-based data than humans, without fatigue and in a consistent, unbiased way. Considering the staggering amount of unstructured data that’s generated every day, from medical records to social media, automation will be critical to analyze text and speech data efficiently thoroughly.
Human language is astoundingly complex and diverse. We express ourselves in infinite ways, both verbally and in writing. Not only are there hundreds of languages and dialects, but within each style is a unique set of grammar and syntax rules, terms, and slang. When we write, we often misspell or abbreviate words, or omit punctuation. When we speak, we have regional accents, and we mumble, stutter, and borrow terms from other languages.
While supervised and unsupervised learning, and specifically deep learning, are now widely used for modeling human language, there’s also a need for syntactic and semantic understanding and domain expertise that are not necessarily present in these machine learning approaches. NLP is important because it helps to resolve ambiguity in language and adds useful numeric structure to the data for many downstream applications, such as speech recognition or text analytics.
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The main currency of the modern world is information. The most valuable elements of information are insights and understanding of the context they are in. Semantics is the key to understanding the meaning and extracting valuable insight out of available data. This is what the majority of human activity is about – in one way or another.
However, there is way too much data to comprehend and far too many tasks to accomplish to get the big picture manually. That’s why computers are integral parts of any business operation.
The critical element in interpreting data and the meaning behind it is the natural language processing algorithms.
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