Why prediction array may be empty?

[ProjectINT]

I am a very new in this technology and theory, i trying debug small ocr package which based on libsvm.js. And I face the problem, when I create instance with tested correct model, i receive empty prediction []. If interesting code there but it not working yet, few days ego I fork it from mrz-scanner package. How work method predicate and when expected empty prediction? And additional question, is some one can help? And how to learn more about libsvm.js, may be someone can advice sites or documentation, what I need to know for using this technology for OCR use cases?

[ProjectINT]

Problem was in uncompatible version of ml-kernel dependency module. Libsvm.js work fine