Probability Processing Circuits Offer 1,000x Efficiencies in Cost, Power

Lyric Semiconductor Inc., a DARPA- and venture-funded MIT spin-out, has emerged from stealth mode to launch a new technology called probability processing, which is poised to deliver a fundamental change in processing performance and power consumption. With over a decade of development at MIT and at Lyric Semiconductor, Lyric’s probability processing technology calculates in a completely new way, enabling orders-of-magnitude improvement in processor efficiency. Lyric Error Correction (LEC) for flash memory, the first commercial application of probability processing, offers a 30X reduction in die size and a 12X improvement in power consumption all at higher throughput compared to today’s digital solutions.

Lyric Semiconductor has developed an alternative to digital computing. The company is redesigning processing circuits from the ground up to natively process probabilities – from the gate circuits to the processor architecture to the programming language. As a result, many applications that today require a thousand conventional processors will soon run in just one Lyric processor, providing 1,000x efficiencies in cost, power, and size.

Lyric has invented a new kind of logic gate circuit that uses transistors as dimmer switches instead of as on/off switches. These circuits can accept inputs and calculate outputs that are between 0 and 1, directly representing probabilities - levels of certainty.

A digital processor steps through these operations serially in order to perform a function. In order to improve efficiency even further, Lyric’s processors are designed to perform many probability computations in parallel.

Lyric’s approach can accelerate search, fraud detection, spam filtering, financial modeling, genome sequence analysis, and many other important present and future applications that involve simultaneously considering many possible alternatives and deciding on the best fit – the best guess for the answer. In theory, digital processors can perform these calculations, but in practice, they do so very inefficiently. As a result, a huge amount of processing overhead is required, costing an enormous amount of space, power and money.

“After a decade of development, we have no shortage of opportunities for our probability processing technology, but we are currently focused on a modest list of both short and long-term applications that will see enormous gains in performance,” says Lyric Semiconductor CEO and co-founder Ben Vigoda. “We are starting with Lyric Error Correction but ultimately plan to develop a more general purpose probability processor that will truly change the landscape for many applications.”

Lyric Error Correction (LEC) for Flash Memory
Flash error rates have become increasingly problematic with each new generation of the technology. Today, one in every thousand bits stored in a flash memory comes out wrong when the memory is read. In the next generation, the number of errors will approach one bit wrong in every hundred. Flash companies spend billions of dollars on new foundry processes in order to increase overall flash density, but then suffer from increasing error rates. As a result, “advanced” error correctors have had to become significantly larger, more complex and more expensive. LEC is Lyric’s first commercial probability processing offering– an advanced error corrector for flash memories that is 30x smaller and has 12x lower power consumption, all at a higher bandwidth than the digital implementations currently available.

The GP5
Beyond today’s LEC technology, Lyric is developing the GP5 – a general-purpose programmable probability processing platform. The GP5 will be ideally suited to calculate probabilities for all types of applications – from web searches to genome sequencing – and could enable performance gains of 1,000x over today’s digital x86-based systems such as the processors from Intel and AMD. The GP5 will run code written in Lyric’s own probability programming language called PSBL (Probability Synthesis to Bayesian Logic), an expressive computer programming language for working with probability based computations. Lyric will leverage its probability processor and programming technologies to deliver disruptive total systems to its customers.

Lyric Semiconductor