What is AI Training Data?

AI training data is the information used to train a machine learning model. In the data science community, AI training data is also referred to as the training set, training dataset, learning set, and ground truth data. AI training datasets include both the input data, and corresponding expected output. Machine learning models use the training dataset to learn how to recognize patterns and apply technologies such as neural networks, so that the models can make accurate predictions when later presented with new data in real world applications.

It’s crucial to use clean, high-quality data to train your machine learning models. If your training dataset includes errors or irrelevant data, then that will negatively impact the performance of your model. Lionbridge provides high-quality, custom AI training data in 300 languages, for a wide range of machine learning applications including chatbots, sentiment analysis, and text categorization. We leverage our Smart Crowd™️ of 500,000 certified contributors to quickly provide you with high-volume custom datasets, without sacrificing on the quality.

Why Choose Lionbridge’s AI Training Data Services?

Lionbridge offers AI training data in 300 languages. With over 20 years of experience as an excellent provider of AI training data, we provide high-quality custom datasets to the world’s leading technology companies.

  • 500,000+ Contributors
  • 300+ Languages
  • 20+ Years of experience


Lionbridge has access to 500,000 qualified contributors around the globe, so we can provide large, custom AI training datasets with a quick turnaround time.


Lionbridge’s quality assurance system includes a rigorous review process to ensure that we provide accurate, high-quality training datasets for your machine learning projects.


With 20 years of experience in providing professional crowdsourcing services, Lionbridge can quickly assign the most qualified workers to build your custom AI training datasets.

Lionbridge’s AI Training Data Services

Data Collection

Collecting large volumes of high-quality data can be the hardest part of a machine learning project. Lionbridge will help you source text, image, audio, and video data to train your machine learning models.

Data Annotation

Large-scale human annotation services are the key to successful machine learning. Lionbridge provides a range of text, image, audio, and video data annotation to help build the ground truth for your model.

Data Validation

No matter the volume of your dataset, Lionbridge’s network of 500,000 contributors will ensure that each of your data points are correct and useful.

How Does Lionbridge’s AI Training Data Services Work?

how to crowdsource data

1. Project set-up

Our team will work with you to develop a custom solution based on your project objectives and timeline.

how to crowdsource data
how to crowdsource data

2. Production

Our crowd of multilingual experts get to work creating, annotating or validating your data.

how to crowdsource data
how to crowdsource data

3. Delivery

Our project management team checks, packages and formats the data before being sent to you for final approval.

how to crowdsource data

Success Stories


We sourced a qualified group of English language experts ages 18-45, and created 10 chatbot utterances each for 29 user intents. The utterances encompassed both formal and casual language.


Lionbridge’s contributors annotated 17 visible body parts in 1,000 photos of people playing various sports, to help an early-stage venture fund train their computer vision model to analyze video frames. The image annotation was done by plotting about 15 anatomical key points per photo.


We collected, labeled, and categorized informal social media posts into 29 different categories: automotive, fine art, travel, etc. This allowed Basis Technology Corp., an AI software company, to build high-quality natural language processing systems. 


AI Training Data Pricing

How much does AI training data cost?
Most AI companies opt to outsource the time-intensive and manual task of creating AI training datasets. Lionbridge provides an affordable outsourcing solution for your AI training data needs.

Contact us to get a free estimate for your project.

  • Account Manager
  • Project Management
  • 24/7 Support
  • API
  • NDA
  • Volume pricing
  • Custom reporting
  • Enterprise-grade SLAs
  • Custom invoicing
  • Consulting services
Get in touch with our team today

Multilingual AI Training Data Services

Lionbridge provides custom AI training datasets in 300 languages. Some of our most popular languages include:

  • Chinese AI training data
  • Dutch AI training data
  • French AI training data
  • German AI training data
  • Italian AI training data
  • Japanese AI training data
  • Portuguese AI training data
  • Spanish AI training data

Learn More about AI Training Data

Thorough training is essential to the development of any artificial intelligence (AI) model. But what does training involve, exactly? Let’s use a working example to demystify the training process.
Training data is absolutely essential to the development of any machine learning model. A clear understanding of how it works will drastically improve your chances of success. Let’s dive into the world of training and figure out why it’s so important.
To improve the decision-making ability of AI models, data scientists must feed large volumes of training data, so those models can use it to figure out patterns. But raw data, such as in the form of an audio recording or text messages, is useless for training machine learning models.