Approximate calculation device for sigmoid function
A technology of approximate calculation and function, applied in the field of VLSI design, it can solve the problems of high hardware resource overhead and long delay, and achieve the effect of saving area, reducing delay and wide application prospects.
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[0017] The solution of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0018] In this embodiment, the input interval (-8, 8) of the sigmoid is segmented at equal intervals, and the segment length is ln2; in different input intervals, the following formula is used to approximate the sigmoid function:
[0019]
[0020] Wherein, δ(x) represents a sigmoid function, x is an independent variable of the function, k is an integer, and 0
[0021] The schematic diagram of the hardware architecture embodiment of the present invention is as follows figure 1 As shown, the range of the input variable x is in the interval of (-8, 8), ...
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