Patrick Jaillet, Xin Lu, Online Stochastic Matching: New Algorithms with Better Bounds, Mathematics of Operations Research, Vol. 39, No. 3 (August 2014), pp. 624-646 ...

Using the geometric pattern-matching algorithm with the gray rectangle pattern described earlier yields information about the rectangle’s edges, not about the gray-scale levels in the rectangle.

A New Algorithm “With the updated algorithm, machine learning technology assesses and interprets the signals sent by our millions of users,” said Tinder CTO Ryan Ogle in a prepared statement.