http://www.meetup.com/SF-Bayarea-Machine-Learning/ – A group to discuss all things Machine Learning! Some topics: learning theory, computer vision, natural language processing, data mining, computer audition, etc.
http://www.meetup.com/Silicon-Valley-Machine-Learning/ – Silicon Valley Machine Learning
http://www.meetup.com/Artificial-Intelligence-and-Character-Animation-SF/ – Artificial Intelligence and Character Animation SF
http://www.meetup.com/Exotic-Deep-Learning/ – Exotic Deep Learning
http://www.meetup.com/SF-Artificial-Intelligence-in-health/ – SF Artificial Intelligence in health
http://www.meetup.com/Bay-Area-Building-Intelligent-Applications-Meetup/ – Bay Area Building Intelligent Applications Meetup, data science and machine learning.
http://www.meetup.com/SV-Deep-Learning/ – SV Deep Learning, deep learning, artificial neural networks, AI and emerging research in this field.
http://www.meetup.com/OpenAI-San-Francisco/ – Enthusiastic OpenAI San Francisco meetup.
http://www.meetup.com/San-Francisco-The-Machine-Learning-Conference – San Francisco The Machine Learning Conference.
http://www.meetup.com/Machine-Learning-for-Humans-with-BigML/ – Machine Learning for Humans with BigML.
http://www.meetup.com/sfrobotics/ – San Francisco Robotics and AI Meetup
http://www.meetup.com/superintelligencemeetup/ – San Francisco Artificial Intelligence Meetup
http://www.meetup.com/TensorFlow-San-Francisco/ – TensorFlow San Francisco
http://www.meetup.com/NeuroTechSF/ – NeuroTechSF
http://www.meetup.com/deep-learning-sf/ – Deep Learning Study Group (San Francisco)
http://www.meetup.com/sf-text/ – San Francisco Text Meetup, NLP
http://www.meetup.com/SF-MonkeyLearn-Machine-Learning-NLP-group/ – SF MonkeyLearn – Machine Learning & NLP group