These identifiers can take various forms, including alphanumeric codes, numerical sequences, or even custom-designed metadata tags. In the case of "fc2ppv3121790," it seems to follow a specific format that might be used by a particular platform or service.
– Emphasizes the flexibility of the PPV term, suggesting it can be swapped for other predictive metrics (e.g., NPV, F1). The authors also note potential extensions to hierarchical and online clustering. fc2ppv3121790