difference between REST implement and orica function

[Y2KdeLaplace]

I want to use ORICA to do real-time decoding, but I found there were some differences between the flt_orica function and orica funtion.

I can figure out that the orica function doesn't calculate the variance like flt_orica, but I don't know why they have different nonlinear functions for super- vs. sub-gaussian.

orica

f(state.kurtsign,:) = -2 * tanh(y(state.kurtsign,:)); % Supergaussian
f(~state.kurtsign,:) = 2 * tanh(y(~state.kurtsign,:)); % Subgaussian

flt_orica

f(state.kurtsign,:) = -2 * tanh(y(state.kurtsign,:)); % Supergaussian
f(~state.kurtsign,:) = tanh(y(~state.kurtsign,:)) - y(~state.kurtsign,:); % Subgaussian

Actually, I am just a normal user of REST and don't know too many details of ORICA. I want to know that is it matter to use orica function now? Because it seems like that orica function is an old version code. Or I just need to modify orica function according to flt_orica function on my own?