Implemented learning experiment for segmentation

Signed-off-by: Luiz Carlos Cavalcanti <cavalcanti.luiz@gmail.com>
replaced training images

Signed-off-by: Luiz Carlos Cavalcanti <cavalcanti.luiz@gmail.com>
Added validation dataset

Signed-off-by: Luiz Carlos Cavalcanti <cavalcanti.luiz@gmail.com>