معادل فارسی عبارت "seed’s gradient" در جمله زیر؟

Question

Focused crawler, originally presented by de Bra et al. [22] and then studied by several others [23], [24], are intended to fetch results appropriate to a pre-specified area of concern by the Web’s hyperlink construction. A focused crawler begins with a seed’s gradient of relevant URLs. URL keywords and page content relevance are naturally explored in evaluation link rate.

evaluation link rate به چه معناست؟