Why We Need to Audit Algorithms

Originally Posted on Harvard Business Review
by  James Guszcza, Iyad Rahwan, Will Bible, Manuel Cebrian, and Vic Katyal
NOVEMBER 28, 2018

Algorithmic decision-making and artificial intelligence (AI) hold enormous potential and are likely to be economic blockbusters, but we worry that the hype has led many people to overlook the serious problems of introducing algorithms into business and society. Indeed, we see many succumbing to what Microsoft’s Kate Crawford calls “data fundamentalism” — the notion that massive datasets are repositories that yield reliable and objective truths, if only we can extract them using machine learning tools. A more nuanced view is needed. It is by now abundantly clear that, left unchecked, AI algorithms embedded in digital and social technologies can encode societal biasesaccelerate the spread of rumors and disinformation, amplify echo chambers of public opinion, hijack our attention, and even impair our mental wellbeing.

Ensuring that societal values are reflected in algorithms and AI technologies will require no less creativity, hard work, and innovation than developing the AI technologies themselves. We have a proposal for a good place to start: auditing. Companies have long been required to issue audited financial statements for the benefit of financial markets and other stakeholders. That’s because — like algorithms — companies’ internal operations appear as “black boxes” to those on the outside. This gives managers an informational advantage over the investing public which could be abused by unethical actors. Requiring managers to report periodically on their operations provides a check on that advantage. To bolster the trustworthiness of these reports, independent auditors are hired to provide reasonable assurance that the reports coming from the “black box” are free of material misstatement. Should we not subject societally impactful “black box” algorithms to comparable scrutiny?

Indeed, some forward thinking regulators are beginning to explore this possibility. For example, the EU’s General Data Protection Regulation (GDPR) requires that organizations be able to explain their algorithmic decisions. The city of New York recently assembled a task force to study possible biases in algorithmic decision systems. It is reasonable to anticipate that emerging regulations might be met with market pull for services involving algorithmic accountability.

So what might an algorithm auditing discipline look like? First, it should adopt a holistic perspective. Computer science and machine learning methods will be necessary, but likely not sufficient foundations for an algorithm auditing discipline. Strategic thinking, contextually informed professional judgment, communication, and the scientific method are also required.

As a result, algorithm auditing must be interdisciplinary in order for it to succeed. It should integrate professional skepticism with social science methodology and concepts from such fields as psychology, behavioral economics, human-centered design, and ethics. A social scientist asks not only, “How do I optimally model and use the patterns in this data?” but further asks, “Is this sample of data suitably representative of the underlying reality?” An ethicist might go further to ask a question such as: “Is the distribution based on today’s reality the appropriate one to use?” Suppose for example that today’s distribution of successful upper-level employees in an organization is disproportionately male. Naively training a hiring algorithm on data representing this population might exacerbate, rather than ameliorate, the problem.

An auditor should ask other questions, too: Is the algorithm suitably transparent to end-users? Is it likely to be used in a socially acceptable way? Might it produce undesirable psychological effects or inadvertently exploit natural human frailties? Is the algorithm being used for a deceptive purpose? Is there evidence of internal bias or incompetence in its design?  Is it adequately reporting how it arrives at its recommendations and indicating its level of confidence?

Even if thoughtfully performed, algorithm auditing will still raise difficult questions that only society — through their elected representatives and regulators — can answer. For instance, take the example of ProPublica’s investigation into an algorithm used to decide whether a person charged with a crime should be released from jail prior to their trial. The ProPublica journalists found that the blacks who did not go on to reoffend were assigned medium or high risk scores more often than whites who did not go on to reoffend. Intuitively, the different false positive rates suggest a clear-cut case of algorithmic racial bias. But it turned out that the algorithm actually did satisfy another important conception of “fairness”: a high score means approximately the same probability of reoffending, regardless of race.  Subsequent academic research established that it is generally impossible to simultaneously satisfy both fairness criteria.  As this episode illustrates, journalists and activists play a vital role in informing academics, citizens, and policymakers as they investigate and evaluate such tradeoffs. But algorithm auditing should be kept distinct from these (essential) activities.

Indeed, the auditor’s task should be the more routine one of ensuring that AI systems conform to the conventions deliberated and established at the societal and governmental level. For this reason, algorithm auditing should ultimately become the purview of a learned (data science) profession with proper credentialing, standards of practice, disciplinary procedures, ties to academia, continuing education, and training in ethics, regulation, and professionalism. Economically independent bodies could be formed to deliberate and issue standards of design, reporting and conduct. Such a scientifically grounded and ethically informed approach to algorithm auditing is an important part of the broader challenge of establishing reliable systems of AI governance, auditing, risk management, and control.

As AI moves from research environments to real-world decision environments, it goes from being a computer science challenge to becoming a business and societal challenge as well. Decades ago, adopting systems of governance and auditing helped ensure that businesses broadly reflected societal values. Let’s try replicate this success for AI.

Posted by Zak Kennedy