Activation function hybrid calculation method and system based on CORDIC

Abstract

The invention discloses an activation function hybrid calculation method and system based on CORDIC, and belongs to the technical field of function calculation. The method comprises: a core control module processing a to-be-evaluated x according to a calculation type t to obtain an input value a and inputting the input value a into a hyperbolic rotation mode CORDIC module; performing operation according to the input value a to obtain xn and yn, adding the xn and yn through an adder to obtain an input value b, inputting the input value b into a linear vector mode CORDIC module for division operation to obtain z'n, and processing and outputting the z'n according to the calculation type t. The system comprises a core control module, a hyperbolic rotation mode CORDIC module and a linear vectormode CORDIC module, wherein the hyperbolic rotation mode CORDIC module and the linear vector mode CORDIC module are respectively connected with the core control module. The method aims to overcome the defects that in the prior art, the sigmoid function and the tanh function are low in calculation precision and the calculation range is not easy to expand, the calculation precision of the sigmoid function and the tanh function can be improved, and the data range can be expanded.

Description

technical field [0001] The present invention relates to the technical field of function calculation, and more specifically, to a CORDIC-based activation function hybrid calculation method and system. Background technique [0002] CORDIC (CoordinateRotationDigitalComputer), that is, coordinate rotation digital computer, can be widely used in the calculation of basic functions, including exponential functions, division and other operations. It was first proposed by J.D.Volder in 1959. Later, J.Walter proposed a unified CORDIC algorithm in 1971; in 2004, Tso-BingJuang et al. proposed an improved parallel CORDIC algorithm, which greatly improved the iteration speed of the CORDIC algorithm and achieved high accuracy. . Its advantage is that it only balances important hardware indicators such as calculation accuracy, area and speed through shifting and addition and subtraction operations, so it is widely used in digital signal processing and other fields. The CORDIC algorithm h...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of the prior art that the calculation results of the sigmoid function and the tanh function have low accuracy and the calculation range is not easy to expand, and provide a CORDIC-based activation function hybrid calculation method and system, which can improve the sigmoid function and the tanh function. Calculation accuracy, and can expand the data range and reduce computing resource overhead

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