There are two algorithms Mylio uses for face tagging: Suggestions and Proposals.
When you preview an image and click on a face, you will see a popup menu that contains a list the top five matching people, arranged in order of confidence. When using this manual tagging method, there is no lower limit to the confidence–we’ll show people even if the confidence is effectively zero.
When you enter a Person folder and select “All” or “Proposed”, or if you enter Batch Tagging, you will see a set of faces that we automatically Propose to be a particular person. These Proposals do have a confidence threshold–we won’t automatically Propose a person to a face unless we’re around 80% confident that it is a correct match.
Because Proposals are limited to high-confidence matches and Suggestions are not, you will often find correct Suggestions in the popup menu but not see a Proposal for the face in Batch Tagging or in the Person folder view–Mylio was just not confident to automatically Propose a person to the face in these cases
Mylio updates Proposals automatically, beginning two to three minutes after the application is started. One exception is that while in Batch Tagging mode, Proposal updates are suspended in order to avoid the user interface from changing out from under the user as faces are tagged. Often, if you exit and reenter Batch Tagging after a few seconds, the batches will have been updated. In the Person folder view, Proposals are updated immediately after tagging a face, and you will see any new Proposals slide into the view.
The Proposal Threshold setting is not something we encourage users to change. However, if you choose to do so, currently a Mylio restart is required before the change takes effect (this will be fixed in a future release). Lower Proposal Threshold values equate to higher confidence required for automatic face Proposals.