The most frequent problem was to find the encoding of an object. The encoding is a fixed-size vector of numbers. Some projects had also restrictions about the maximal size due to limited resources of the final device. Another class of problem was to detect malicious data and attacks on existing systems. Also, many smaller issues had to be solved while working on the whole algorithm like answering the questions: is the quality of a picture good enough? where is the object on an image? how to increase the amount of data and/or its quality?