  This article reviews the Once Learning mechanism that was proposed 23 years
ago and the subsequent successes of One-shot Learning in image classification
and You Only Look Once-YOLO in objective detection. Analyzing the current
development of AI, the proposal is that AI should be clearly divided into the
following categories: Artificial Human Intelligence (AHI), Artificial Machine
Intelligence (AMI), and Artificial Biological Intelligence (ABI), which will
also be the main directions of theory and application development for AI. As a
watershed for the branches of AI, some classification standards and methods are
discussed: 1) AI R&D should be human-oriented, machine-oriented, and
biological-oriented; 2) The information input is processed by Dimensionality-up
or dimensionality-reduction; and 3) One/Few or large samples are used for
knowledge learning.
