The current specification covers various new algorithms, methods, and systems for, e.g., image recognition (e.g., for action, gesture, emotion, expression, biometrics, fingerprint, facial, OCR (text recognition), background, relationship, position, pattern, and object), machine learning, training schemes, feature space, clustering, classification, similarity measures, optimization, search engine, ranking, question-answering system, soft (fuzzy or unsharp) boundaries/impreciseness/fuzziness in language, clustering, and recognition, Natural Language Processing (NLP), Computing with Words (CWW), parsing, machine translation, sound and speech recognition, video search and analysis (e.g. tracking), image annotation, geometrical abstraction, image correction, semantic web, context analysis, data reliability (e.g., using Z-number (e.g., “About 45 minutes; Very sure”)), rules engine, control system, autonomous vehicle, system diagnosis, medical diagnosis, biomedicine, large number of images analytics, event prediction, financial forecasting, economics, risk assessment, e-mail management, database management, indexing and join operation, memory management, data compression, and crowd-sourcing (using experts or humans).