Temporal reasoning

A device, comprising:

• a memory;
• and
• one or more processors configured to:
• apply a sliding window along a user activity timeline, wherein the sliding window represents a temporal range associated with an activity;
• detect a time interval within the sliding window indicative of the activity by identifying a pattern corresponding to the activity within contextual information associated with the user activity timeline;
• receive user activity information from a plurality of data sources associated with the time interval;
• calculate a confidence score for the activity based at least in part on the received user activity information, the confidence score indicating a likelihood of an occurrence of the activity within the time interval;
• and
• update a graph-based data structure with a node representing the activity based on the confidence score exceeding a confidence threshold.

A non-transitory machine-readable medium comprising code that, when executed by a processor, causes the processor to perform operations comprising:

• receiving contextual information from a plurality of data sources on an electronic device;
• identifying a predetermined pattern that is indicative of a particular activity in the contextual information within a time interval;
• determining a confidence score for the particular activity based at least in part on one or more confidence values of a corresponding activity signal associated with the time interval, the confidence score indicating a likelihood of an occurrence of the particular activity within the time interval;
• determining whether the confidence score of the particular activity exceeds a confidence threshold;
• updating a graph-based data structure by adding a representation of the particular activity as a node to the graph-based data structure based on the confidence score of the particular activity exceeding the confidence threshold, the graph-based data structure comprising one or more interconnections between different nodes associated with different activities;
• and
• providing, for display on the electronic device, a user activity interface that provides access to an indexed collection of events organized by activity type by querying the graph-based data structure.