What's the definition of Diabetes Pedigree Function?

[Kaede93]

There is a feature in Diabetes.csv named Diabetes Pedigree Function (pedi), and I searched its introduction as below

A particularly interesting attribute used in the study was the Diabetes Pedigree Function, pedi. It provided some data on diabetes mellitus history in relatives and the genetic relationship of those relatives to the patient. This measure of genetic influence gave us an idea of the hereditary risk one might have with the onset of diabetes mellitus. Based on observations in the proceeding section, it is unclear how well this function predicts the onset of diabetes.

Can anybody tell me that the definition of this pedi feature? I mean, the mathematical definition

[Bidyutmaji]

A function that scores the likelihood of diabetes based on family history.

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