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What Is Human-In-The-Loop for Machine Learning

Mothi Venkatesh
June 21, 2018

Computers are incredibly fast, accurate and stupid; humans are incredibly slow, inaccurate and brilliant; together they are powerful beyond imagination hence the concept human-in-the-Loop.Given that there have been huge advances in the development and accuracy of machine-driven systems, they still tend to fall short of the desired accuracy rates. This is the philosophy behind the concept of Human-in-the-Loop for Machine Learning.

Human-in-the-Loop (HITL)

This concept leverages both human and machine intelligence to create machine learning models. In this approach, humans are directly involved in training, tuning and testing data for a particular ML algorithm.The intention being, to use a trained crowd or general human population to correct inaccuracies in machine predictions thereby increasing accuracy, which results in higher quality of results.Research suggests that a variant of Pareto's 80:20 rule is consistent with most accurate machine learning systems to date, with 80% AI-driven, 19% human input and 1% randomness.

pareto principle applied for Human-in-the-loop machine learning


Wondering what was the weird formula you just read? What the formula essentially delivers is that HITL is the combination of Supervised Machine Learning (SML) and Active Learning (AL).Supervised ML, curated (labeled) data sets used by ML experts to train algorithms by adjusting parameters, in order to make accurate predictions for incoming data.In Active Learning, the data is taken, trained, tuned, tested and more data is fed back into the algorithm to make it smarter, more confident, and more accurate. This approach–especially feeding data back into a classifier is called active learning.

Here's how Human-in-the-loop ML works

A combination of AI and Human Intelligence gives rise to an extremely high level of accuracy and intelligence (Super Intelligence). This combination is powerful beyond imagination.

When does HITL come into play?

  1. When the cost of errors is too much. An ML algorithm can have absolutely no margin for error. Any room for error leads to dire situations.
  2. When there are Class Imbalances. There are many situations where the thing you are looking for is quite rare, machines cannot answer this question with a high level of confidence. Humans can help resolve matters and, in doing so, retrain the ML model.
  3. When there's little data available at present. For example, classification of social media posts, for a new business in its early stages, by machines might not be a viable option due to the scarcity of data. Humans will make much better judgments in the early stages, but, over time, machines can learn and can take over the task.

Potential of HITL in Machine Learning applications

That's exactly why we built Playment!

The One-stop data labelling solution built with the human-in-the-loop machine learning. We support a wide range of annotation types like bounding boxes, cuboids, polygons, polylines, landmarks and semantic segmentation. We provide a fully managed, hassle free solution to all your training data needs. Since inception, we successfully offloaded over 36 million annotation tasks with our 300k+ user base.For more information on Playment, kindly visit Playment website.