Systems and techniques for colocation and context determination

A system comprising:

• a computing system including one or more processors;
• and
• a computer-readable medium having stored therein instructions that, when executed by the one or more processors of the computing system, cause the computing system to perform operations comprising:
• receiving first sensor data from one or more sensors of a first computing device;
• receiving second sensor data from one or more sensors of a second computing device;
• determining, based on the first and second sensor data, that the first and second computing devices are colocated with one another;
• identifying, based on the first sensor data, a context associated with the first computing device;
• identifying, based at least in part on the context associated with the first computing device, a context associated with the second computing device, and
• responsive to identifying the context associated with the second computing device, updating one or more expected sensor measurement values associated with the identified context for use in a subsequent context identification, wherein the one or more expected sensor measurement values are updated based on the second sensor data,
• wherein the context associated with the first computing device, the context associated with the second computing device, and the subsequent context relate to one or more activities.