It's acceptable comma usage if you think of "open-sourced" as an adjective modifying "neural networks". A similar example of that would be "The Bill of Rights, Summarized".

Wi-Fi location works kind of like Google Street View — someone drives around and collects information on the wireless devices in the area. All of this data is subsequently collected into a database, which is then used to look up locations based on the names and strengths of nearby networks.