A method for producing a 3–4-pyridazinol compound represented by the following general formula :comprising reacting a compound represented by the following general formula :with a compound represented by the following general formula :MO\u2014R2\u2003\u2003. Each sub-layer comprises a different composition than the adjacent sub-layer and comprises a polarization that is opposite a polarization of the adjacent sub-layer. The face image is classified with respect to the attribute based on the features of the image, and the attribute and a confidence value are assigned to the face image based on the classifying.