address here the most crucial comments in groups (R1, R2, R3 and R4 denote concerns raised by the corresponding

We warmly thank the four reviewers for their work and constructive feed-backs. In the revised paper, we will of course do our best to address all reviewers' comments using the additional This will be clarified in introduction and Isolet interpretation. The reasons of that choice will be incorporated in the section concerning the NE family. We see Ex. 1: Random labels digits Some of the many supervised indicators of the literature will be added. Other issues (R1, R3, R4) The suggested references will be incorporated.