Incomputational neuroscience,SUPS (forSynapticUpdatesPerSecond) or formerly CUPS (ConnectionsUpdatesPerSecond) is a measure of a neuronal network performance, useful in fields ofneuroscience,cognitive science,artificial intelligence, andcomputer science.

For a processor or computer designed to simulate a neural network SUPS is measured as the product of simulated neurons${\displaystyle N}$ and average connectivity${\displaystyle c}$(synapses) per neuron per second:

${\displaystyle SUPS=c\times N}$

Depending on the type of simulation it is usually equal to the total number of synapses simulated.

In an "asynchronous" dynamic simulation if a neuron spikes at${\displaystyle \upsilon }$ Hz, the average rate of synaptic updates provoked by the activity of that neuron is${\displaystyle \upsilon cN}$. In a synchronous simulation with step${\displaystyle \mathrm{\Delta }t}$ the number of synaptic updates per second would be${\displaystyle \frac{cN}{\mathrm{\Delta }t}}$. As${\displaystyle \mathrm{\Delta }t}$ has to be chosen much smaller than the average interval between two successive afferent spikes, which implies, giving an average of synaptic updates equal to${\displaystyle \upsilon c{N}^2}$. Therefore, spike-driven synaptic dynamics leads to a linear scaling of computational complexityO(N) per neuron, compared with the O(N²) in the "synchronous" case.^[1]

Developed in the 1980s Adaptive Solutions' CNAPS-1064 Digital Parallel Processor chip is a fullneural network (NNW). It was designed as acoprocessor to a host and has 64 sub-processors arranged in a1D array and operating in aSIMD mode. Each sub-processor can emulate one or more neurons and multiple chips can be grouped together. At 25 MHz it is capable of 1.28 GMAC.^[2]

After the presentation of the RN-100 (12 MHz) single neuron chip at Seattle 1991Ricoh developed the multi-neuron chip RN-200. It had 16 neurons and 16 synapses per neuron. The chip has on-chip learning ability using a proprietary backdrop algorithm. It came in a 257-pinPGA encapsulation and drew 3.0 W at a maximum. It was capable of 3 GCPS (1 GCPS at 32 MHz).^[3]

In 1991–97,Siemens developed the MA-16 chip, SYNAPSE-1 and SYNAPSE-3 Neurocomputer. The MA-16 was a fast matrix-matrix multiplier that can be combined to formsystolic arrays. It could process 4 patterns of 16 elements each (16-bit), with 16 neuron values (16-bit) at a rate of 800 MMAC or 400 MCPS at 50 MHz. The SYNAPSE3-PCPCI card contained 2 MA-16 with a peak performance of 2560 MOPS (1.28 GMAC); 7160 MOPS (3.58 GMAC) when using three boards.^[4]

In 2013, theK computer was used to simulate a neural network of 1.73 billion neurons with a total of 10.4 trillion synapses (1% of the human brain). The simulation ran for 40 minutes to simulate 1 s of brain activity at a normal activity level (4.4 on average). The simulation required 1 Petabyte of storage.^[5]

• FLOP
• SPECint
• SPECfp
• Multiply–accumulate operation
• Orders of magnitude (computing)
• SyNAPSE

• Benchmarks (computing)
• Units of frequency
• Artificial intelligence
• Computational neuroscience
• Neurotechnology

• Articles with short description
• Short description matches Wikidata