sigmoid01_inv.m

回声状态神经网络(ESN)是一种性能优异的递归神经网络

function x = sigmoid01_inv(s)
% inverse to sigmoid01 (see sigmoid01.m for more documentation)
% Its formula is atanh((x - 0.5) * 2);

% Created April 30, 2006, D. Popovici
% Copyright: Fraunhofer IAIS 2006 / Patent pending

% inverse to sigmoid01
x = atanh((s - 0.5) * 2);