ELECTRONIC DEVICE INCLUDING ACCELERATOR FOR PROCESSING FUNCTION AND METHOD OF CONTROLLING THE ELECTRONIC DEVICE

An electronic device includes: a neural processing unit (NPU) configured to process an activation function; and an accelerator in the NPU, wherein the accelerator includes: a function processing block including at least one sub-operation block, and a final output block connected to the function processing block, wherein the at least one sub-operation block includes: a first sub-operation block configured to calculate an approximation output value for the activation function by processing the activation function based on a first point number and a first bit resolution, and a second sub-operation block configured to calculate a detailed output value for the activation function by processing the activation function based on a second point number and a second bit resolution, and wherein the final output block is configured to calculate a final output value corresponding to the activation function based on the approximation output value and the detailed output value.