Analysts at Forrester Research recently recognized Palantir Technologies (PLTR 11.14%) and Alphabet (GOOGL -1.76%) (GOOG -1.95%) as market leaders in artificial intelligence (AI) and machine learning platforms, which are collections of tools that support model training and application development.However, billionaire Ken Griffin of Citadel, the most profitable hedge fund in history as measured by net gains since inception, sold Palantir's stock and bought Alphabet's stock during the third quarter, as detail ...