Data are divided into training, development and evolution data sets:
1) ``dev`` data set -- ``20`` persons with both hand images;
2) ``eval`` data set -- ``20`` persons with both hand images;
3) ``world`` data set -- the rest of ``13`` persons with both hand images + ``4`` persons with only ``right`` hand and the ``1`` person with only ``left`` hand images.
Data are divided as follows (the number means original persons ``ID`` (as in