Visitor Stitching does not impact the Predict modeling results.
Predict Machine Learning models train on visitor profiles, not visits. The actual and predicted values that display in the Model Training Details Confusion Matrix refer to the number of of visitors.
When preparing for training, data is filtered by
visitor_id. The model only trains on this (newest) stitched
visitor_id and ignores the older (pre-stitched) ID and thus is not a problem for accounts and profiles with visitor stitching enabled.