15 Common AI Problem Types

One of the problems business leaders face in communicating with their technical counterparts is trying to describe their AI problem. To simplify some of the communication, here are some common AI problem types.

Try to map AI opportunities at hand to these common problem types. Note that the problem types often overlap—but that’s ok. The key is to identify problem types that most closely match the task at hand when communicating with your AI and data science experts.

Common AI Problem Types

1. Classification

A classification problem is about assigning one or more categories to a document, product, person, or image—essentially anything. Examples include:

Big data strategy
Example of support ticket classification

2. Regression

A regression problem is about estimating numerical values given some input. For example, trying to predict the number of months before a machine needs service given the conditions of the current machine, or predicting how specific drug dosage affects blood pressure. 


Predicting a person’s weight given their height—a regression problem. Source: stat.psu.edu

3. Recommendation

A recommendation problem is about providing personalized content or products to a group of people. Examples include:

  • Product recommendation
  • Recommendations on who to follow
  • Recommendations on jobs to apply for
  • Recommendations on articles to read


Recommendations of topics to follow on Twitter. Source: twitter.com

4. Search Relevance

A search relevance problem is about improving the rankings of search results shown to users. Often search relevance improvement starts with the analysis of search logs to diagnose problems using hard data. Search improvement may or may not require heavy use of machine learning.

5. Information Extraction (IE)

An information extraction problem is about extracting specific information from large volumes of text data. One of the goals of information extraction is to fill templates using data extracted from raw text. Examples include:

  • Extracting patient symptoms from large volumes of clinical notes
  • Extracting pertinent information from large volumes of legal case files
  • Pre-populating a candidate application form / database by extracting pertinent information from resumes

6. Text Summarization

Text summarization is about creating an accurate synopsis of a longer document or a set of documents. 


An example of review summarization

7. Clustering

Clustering is about grouping people, content, documents, topics and etc based on some logical structure—for example, grouping customers by their purchase behavior. 

More generally, clustering divides data points into a number of fixed (or dynamic) groups such that the data points in one group are more similar to each other than data points in other groups. 

9. Virtual AI Assistant

Virtual AI Assistant is used for having short conversations with humans to complete simple tasks. Examples include:

  • Providing answers to common customer questions without human involvement
  • Using text messages to check bank balances or to get a refund

Alexa and Siri are examples of virtual AI assistants.

10. Sentiment Analysis

Sentiment Analysis is about discovering emotions in text data such as user reviews, social media comments, and surveys. For example, automatically detecting customer sentiment in social media channels after a new product release. Sentiment analysis can even be applied to images for understanding emotions from facial expressions.

11. Object Detection

Object detection problem is about discovering specific objects such as humans, buildings, or cars in digital images and videos.


Example of object detection—automatically detecting people, traffic lights, personal accessories, and vehicles given an image. Source: infotech.report

12. Document Segmentation Problem

Document segmentation is about trying to subdivide documents into meaningful parts. For example, segmenting unstructured clinical texts to extract their past medical history and family history. 


Example segmentation of a clinical record

13. Keyword Extraction

Keyword extraction is about identifying terms that best describe the subject of a document—for example, extracting keywords from large volumes of legal documents to understand the themes of discussion.

While there are many keyword extraction tools readily available (including open-source tools), you’d need to ensure that these work on your data. Often, keyword extraction tools are best customized or custom-developed.

14. Speech Recognition

Speech recognition, also known as speech-to-text (STT) or automatic speech recognition (ASR), is about having a computer program understand and transform spoken language into a written format (or text).

Speech recognition is often used to complete downstream tasks. For example, speech recognition is used behind the scenes to surface relevant search results when you use Google voice search. Specifically, your speech is translated into a human-readable format, and that generated text is used to surface relevant search results.

Many vendors offer speech recognition solutions, and therefore, speech recognition systems rarely need to be developed from scratch. Of course, these systems will benefit from customization for the target data.

15. Machine Translation

Machine translation is the automatic software translation of text from one language to another. For example, translating English sentences into German with reasonable accuracy. Machine translation programs rarely need to be developed from scratch but may benefit from customization.

Machine translation is used for many purposes, including:

  • Localizing website text for a particular country
  • Customer support conversations across countries
  • Understanding documents written in a different language

Summary of AI Problem Types

In this short guide, we discussed 15 common AI problems types—that often overlap. For example, you can apply a classification approach for sentiment analysis. However, the key is to identify the problem type that best fits the task at hand. It doesn’t have to be 100% accurate—it’s just semantics. You can continually refine these definitions with the help of your AI experts.

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