add per iter loss print
add per iter loss print

Signed-off-by: YAO Matrix <c5950a30946ab5a702dcefaf016d9d8e1e4358e5@intel.com>

yao-matrix/py-R-FCN-MKL,yao-matrix/py-R-FCN-MKL,yao-matrix/py-R-FCN-MKL,yao-matrix/py-R-FCN-MKL,yao-matrix/py-R-FCN-MKL