Neural network device

A neural network device comprising:

• a plurality of cores each executing computation and processing of a partial component in a neural network;
• and
• a plurality of routers transmitting data output from each of the plurality of cores to one of the plurality of cores such that computation and processing are executed according to a structure of the neural network, wherein
• each of the plurality of cores outputs at least one of a forward data propagated through the neural network in a forward direction and a backward data propagated through the neural network in a backward direction,
• each of the plurality of routers is included in one of a plurality of partial regions,
• each of the plurality of partial regions is a forward region or a backward region,
• a router included in the forward region transmits the forward data to another router in a same partial region as the router included in the forward region, and
• a router included in the backward region transmits the backward data to another router in the same partial region as the router included in the backward region,
• each of the plurality of routers includes an outer-region transmission circuitry and an outer-region reception circuitry connected to another router included in another partial region,
• the outer-region transmission circuitry transmits the forward data and the backward data to a connected other router, and
• the outer-region reception circuitry receives the forward data and the backward data from the connected other router,
• each of the plurality of routers further includes an inner-region transmission circuitry and an inner-region reception circuitry connected to another router included in the same partial region as each of the plurality of routers,
• an inner-region transmission circuitry included in the router included in the forward region transmits the forward data to a connected other router, and
• an inner-region reception circuitry included in the router included in the forward region receives the forward data from the connected other router.