Cascading approach to detecting and interpreting user activity

An electronic device comprising:

• one or more sensors;
• a non-transitory computer-readable storage medium;
• and
• one or more processors coupled to the non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium comprises program instructions that, when executed on the one or more processors, cause the electronic device to perform operations comprising:
• performing a first process to produce an output, the first process comprising:
• detecting events based on a first set of sensor data;
• identifying a subset of the events as human-relevant events corresponding to one or more predetermined classes depicted in the first set of sensor data;
• and
• collecting information regarding the human-relevant events based on the first set of sensor data;
• and
• based on the output of the first process, performing a second process to interpret a user activity, the second process comprising obtaining a second set of sensor data and interpreting the user activity using the second set of sensor data.

A non-transitory computer-readable storage medium storing program instructions executable via one or more processors to perform operations comprising:

• performing a first process to produce an output, the first process comprising:
• detecting events based on a first set of sensor data;
• identifying a subset of the events as human-relevant events corresponding to one or more predetermined classes depicted in the first set of sensor data;
• and
• collecting information regarding the human-relevant events based on the first set of sensor data;
• and
• based on the output of the first process, performing a second process to interpret a user activity, the second process comprising obtaining a second set of sensor data and interpreting the user activity using the second set of sensor data.