Switch default deep non-linearity to sigmoid
Switch default deep non-linearity to sigmoid

skaasj/reweighted-ws,lenovor/reweighted-ws,yanweifu/reweighted-ws,codeaudit/reweighted-ws,codeaudit/reweighted-ws,lenovor/reweighted-ws,yanweifu/reweighted-ws,jbornschein/y2k,jbornschein/y2k,skaasj/reweighted-ws,jbornschein/reweighted-ws,jbornschein/reweighted-ws