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What Is Named Entity Recognition (NER): Benefits, Use Cases, Algorithms

| 01 Jul 2022

What Is Named Entity Recognition (NER): Benefits, Use Cases, Algorithms

Named Entity Recognition Definition

Named Entity Recognition (NER) is a field of computer science and natural language processing that deals with the identification and classification of named entities in text. The goal of NER is to automatically extract information from unstructured text, such as names of people, organizations, locations, and so on. In this article, we will discuss what named entity recognition is, why it is important, and how it can be used in a variety of applications.

A major part of the data preprocessing process is the named entity recognition (NER). Textual information is identified and categorized according to predefined categories. Basically, an entity is something that is consistently mentioned or referred to in the text.

NER is used for information extraction that searches  and segmentizes named entities in text. Named entities are defined as proper nouns that refer to specific individuals, places, organizations, or things. NER is a challenging task because named entities can vary in length and can appear in different forms. For example, the named entity “New Orleans” can appear as “New Orleans,” etc.

Table Of Content

  1. Named Entity Recognition Definition
  2. How NER Works?
  3. Common Named Entity Recognition Tasks
  4. Benefits Of Using Named Entity Recognition
  5. How To Use NER In Business?
  6. Use Cases of Named Entity Recognition (NER)
  7. Named Entity Recognition Algorithms

NER systems are used in a variety of applications, such as question answering, information retrieval, and machine translation. NER can also be used to improve the accuracy of other NLP tasks, such as part-of-speech tagging and parsing.

At its core, NLP is just a two-step process, and the two steps are:

  1. Detecting the entities from the text
  2. Classifying them into different categories

Some of the categories that are the most important architecture in NER such that:

  1. Person
  2. Organization
  3. Place/ location

Other common tasks include classifying of the following:

  1. Date/time
  2. Expression
  3. Numeral measurement (money, percent, weight, etc)
  4. E-mail address

How NER Works?

A named entity is a real-world object such as a person, place, or organization, that can be denoted with a proper name. NER is used in a variety of applications, including information extraction, question answering, and machine translation.

An important part of NER is the recognition of common syntactic patterns. NER systems also use natural language processing techniques, such as word embedding and machine learning, to improve the accuracy of the recognition process.

Where Is Named Entity Recognition Used For?

In a paper or any document, NER detects the boundaries of sentences by analyzing capitalization rules. The NER can find and take out the required information from the document by identifying the sentence boundaries.

It is necessary to segmentize entities into predefined buckets before tagging words or phrases such as locations, people, events, times, and organizations. In raw texts, the model can be trained with predefined categories to identify people, places, and organizations.

Some common named entities include people, places, organizations, and things.

What Are Some Common Named Entity Recognition Tasks?

Named entity recognition is a challenging task that has traditionally required large amounts of hand-annotated training data. However, recent advances in machine learning have made it possible to train effective models using relatively little data. Since NER is a sub-task of information extraction that seeks to identify and classify things like people, places, organizations, products, etc, its goal is to automatically identify and classify these named entities in text, in order to make the content easier to understand for machine learning. Some common tasks that use named entity recognition include information extraction, question answering, and text summarization.

What Are The Benefits Of Using Named Entity Recognition?

Named entity recognition (NER) is a process of identifying and classifying named entities in textual content. This can be beneficial for a variety of tasks, such as information extraction, question answering, and text summarization. NER can also help you to better understand the structure of your text data and to find relationships between entities. In addition, NER can be used to improve the accuracy of other NLP tasks, such as part-of-speech tagging and dependency parsing.

How To Use NER In Business?

NLP is being used in almost every industry by enabling machines to understand and process human languages. NER can be used for a variety of tasks, such as identifying customer names in customer service transcripts or determining the location of a user in a social media post. It can also be used to generate leads for sales and marketing teams, by identifying potential customers in a piece of text. NER is a valuable tool for any business that needs to make sense of large amounts of text data.

How Sentiment Analysis Tool Can Help Businesses?

Use Cases of Named Entity Recognition (NER)

  1. In publishing: A publishing house, a media organization or a research institution, managing the online content generated by news outlets and publishing houses correctly is very important if they are going to maximize their use of each article. Automatic Named Entity Recognition analyzes entire articles to identify the prominent people, organizations, and places mentioned. In order to enable smooth content discovery, knowing the relevant tags for each article is necessary to automatically categorize the articles according to defined hierarchies.
  2. For customer care: It is common for companies to receive feedback from their customers about their product/service they give. Businesses can also use NER to classify customer complaints. By categorizing customer complaints by team, department, product, or company branch location, it identifies relevant entities. A complaint is sent automatically to the appropriate department. Companies can thus NER for an automated system that routes customers’ support requests to the right departments.

Named Entity Recognition Algorithms In NLP

There are a number of different algorithms that can be used for Named Entity Recognition. There are different algorithms that can be used for this.

Two of the most common ones are:

  1. Maximum Entropy Markov Model (MEMM), and
  2. Common Random Fields (CRF).

MEMM Algorithm

MEMM algorithm is based on a probabilistic model that takes into account the previous words in a sentence in order to predict the next word. The MEMM algorithm is trained on a corpus of text that has been annotated with named entities. This annotated data is used to build a model that can then be used to predict named entities in new text.

This algorithm is trained on a corpus of text that has been annotated with named entities. This annotated data is used to build a model that can then be used to predict named entities in new text.
One of the advantages of the MEMM algorithm is that it can be easily adapted to different languages and domains.

One of the advantages is that it can be easily adapted to different languages and domains. Additionally, this algorithm is relatively fast and can be run on large corpora of text. It simply scans through a text document and looks for strings of capitalized words. These strings are then classified as named entities.

Condition Random Fields

Condition random fields are also a popular technique for addressing the task of named entity recognition. CRFs are a type of latent semantic indexing model that can be used to automatically extract information from text.

CRFs can be understood both as an extension of the logistic regression classifier to arbitrary graphical structures, or as a discriminative analog of generative models of structured data, such as hidden Markov models.

For tag extraction, one of the best algorithm is TFIDF(unsupervised), Naive Bayes/SVM(supervised).

In conclusion: By 2025, the NLP market is expected to be worth over US $50 billion. NLP has a wide range of use cases – from chatbots to customer service to content processing by enabling machines to understand and process human languages. NER is obviously going to play a big role in the propagation of NLP.

Reference: https://homepages.inf.ed.ac.uk/csutton/publications/crftut-fnt.pdf

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