Explainable Artificial Intelligence
An Explainable AI (XAI) or Transparent AI is an artificial intelligence (AI) whose actions can be easily understood by humans. It contrasts with the concept of the "black box" in machine learning, meaning the "interpretability" of the workings of complex algorithms, where even their designers cannot explain why the AI arrived at a specific decision. XAI can be used to implement a social right to explanation. Transparency rarely comes for free; there are often tradeoffs between how "smart" an AI is and how transparent it is, and these tradeoffs are expected to grow larger as AI systems increase in internal complexity. The technical challenge of explaining AI decisions is sometimes known as the interpretability problem.
AI systems optimize behavior to satisfy a mathematically-specified goal system chosen by the system designers, such as the command, "maximize accuracy of assessing how positive film reviews are in the test dataset". The AI may learn useful general rules from the testset, such as "reviews containing the word 'horrible'" are likely to be negative". However, it may also learn inappropriate rules, such as "reviews containing 'Daniel Day-Lewis' are usually positive"; such rules may be undesirable if they are deemed likely to fail to generalize outside the test set, or if people consider the rule to be "cheating" or "unfair". A human can audit rules in an XAI to get an idea how likely the system is to generalize to future real-world data outside the test-set.
AI systems sometimes learn undesirable tricks that do an optimal job of satisfying explicit pre-programmed goals on the training data, but that do not reflect the complicated implicit desires of the human system designers. For example, a 2017 system tasked with image recognition learned to "cheat" by looking for a copyright tag that happened to be associated with horse pictures, rather than learning how to tell if a horse was actually pictured. In another 2017 system, a supervised learning AI tasked with grasping items in a virtual world learned to cheat by placing its manipulator between the object and the viewer in a way such that it falsely appeared to be grasping the object.
One transparency project, the DARPA XAI program, aims to produce "glass box" models that are explainable to a "human-in-the-loop", without greatly sacrificing AI performance. Human users should be able to understand the AI's cognition (both in real-time and after the fact), and should be able to determine when to trust the AI and when the AI should be distrusted.. Other applications of XAI are knowledge extraction from black-box models and model comparisons.
History and methods
Mycin, a research prototype that could explain which of its hand-coded rules contributed to a diagnosis in a specific case, was developed in the early 1970s. By the 1990s researchers also began studying whether it is possible to meaningfully extract the non-hand-coded rules being generated by opaque trained neural networks. Researchers in clinical expert systems creating neural network-powered decision support for clinicians have sought to develop dynamic explanations that allow these technologies to be more trusted and trustworthy in practice.
The "deep learning" methods powering cutting-edge AI in the 2010s are naturally opaque, as are other complicated neural networks; genetic algorithms likewise are naturally opaque. In contrast, decision trees and Bayesian networks are more transparent to inspection.
Layerwise relevance propagation (LRP), first described in 2015, is a technique for determining which features in a particular input vector contribute most strongly to a neural network's output.
In the 2010s public concerns about racial and other bias in the use of AI for criminal sentencing decisions and findings of creditworthiness may have led to increased demand for transparent artificial intelligence.
In 2018 an interdisciplinary conference called FAT* (Fairness, Accountability, and Transparency) was established to study transparency and explainability in the context of socio-technical systems, many of which include artificial intelligence.
XAI has been researched in many sectors, including:
- Neural Network Tank imaging
- Antenna design (evolved antenna)
- Algorithmic trading (high-frequency trading)
- Medical diagnoses
- Autonomous vehicles
As regulators, official bodies and general users come to depend on AI-based dynamic systems, clearer accountability will be required for decision making processes to ensure trust and transparency. Evidence of this requirement gaining more momentum can be seen with the launch of the first global conference exclusively dedicated to this emerging discipline, the International Joint Conference on Artificial Intelligence: Workshop on Explainable Artificial Intelligence (XAI).
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