Menu
'Black box' no more: This system can spot the bias in those algorithms

'Black box' no more: This system can spot the bias in those algorithms

Why was your loan denied? A university's technique can shed some light

Between recent controversies over Facebook's Trending Topics feature and the U.S. legal system's "risk assessment" scores in dealing with criminal defendants, there's probably never been broader interest in the mysterious algorithms that are making decisions about our lives.

That mystery may not last much longer. Researchers from Carnegie Mellon University announced this week that they've developed a method to help uncover the biases that can be encoded in those decision-making tools.

Machine learning algorithms don't just drive the personal recommendations we see on Netflix or Amazon. Increasingly, they play a key role in decisions about credit, healthcare, and job opportunities, among other things.

So far, they've remained largely obscure, prompting increasingly vocal calls for what's known as algorithmic transparency, or the opening up of the rules driving that decision-making.

Some companies have begun to provide transparency reports in an attempt to shed some light on the matter. Such reports can be generated in response to a particular incident -- why an individual's loan application was rejected, for instance. They could also be used proactively by an organization to see if an artificial intelligence system is working as desired, or by a regulatory agency to see whether a decision-making system is discriminatory.

But work on the computational foundations of such reports has been limited, according to Anupam Datta, CMU associate professor of computer science and electrical and computer engineering. "Our goal was to develop measures of the degree of influence of each factor considered by a system," Datta said.

CMU's Quantitative Input Influence (QII) measures can reveal the relative weight of each factor in an algorithm's final decision, Datta said, leading to much better transparency than has been previously possible. A paper describing the work was presented this week at the IEEE Symposium on Security and Privacy.

Here's an example of a situation where an algorithm's decision-making can be obscure: hiring for a job where the ability to lift heavy weights is an important factor. That factor is positively correlated with getting hired, but it's also positively correlated with gender. The question is, which factor -- gender or weight-lifting ability -- is the company using to make its hiring decisions? The answer has substantive implications for determining if it is engaging in discrimination.

To answer the question, CMU's system keeps weight-lifting ability fixed while allowing gender to vary, thus uncovering any gender-based biases in the decision-making. QII measures also quantify the joint influence of a set of inputs on an outcome -- age and income, for instance -- and the marginal influence of each.

"To get a sense of these influence measures, consider the U.S. presidential election," said Yair Zick, a post-doctoral researcher in CMU's computer science department. "California and Texas have influence because they have many voters, whereas Pennsylvania and Ohio have power because they are often swing states. The influence aggregation measures we employ account for both kinds of power."

The researchers tested their approach against some standard machine-learning algorithms that they used to train decision-making systems on real data sets. They found that QII provided better explanations than standard associative measures for a host of scenarios, including predictive policing and income estimation.

Next, they're hoping to collaborate with industrial partners so that they can employ QII at scale on operational machine-learning systems.


Follow Us

Join the newsletter!

Error: Please check your email address.

Featured

Slideshows

Looking back at the top 15 M&A deals in NZ during 2017

Looking back at the top 15 M&A deals in NZ during 2017

In 2017, merger and acquisitions fever reached new heights in New Zealand, with a host of big name deals dominating the headlines. Reseller News recaps the most important transactions of the Kiwi channel during the past 12 months.

Looking back at the top 15 M&A deals in NZ during 2017
Kiwi channel closes 2017 with After Hours

Kiwi channel closes 2017 with After Hours

The channel in New Zealand came together to celebrate the close of 2017, as the final After Hours played out in front of a bumper Auckland crowd.

Kiwi channel closes 2017 with After Hours
Meet the top performing HP partners in NZ

Meet the top performing HP partners in NZ

HP honoured leading partners across the channel at the Partner Awards 2017 in New Zealand, recognising excellence across the entire print and personal systems portfolio.

Meet the top performing HP partners in NZ
Show Comments