A system, a machine-readable storage medium storing instructions, and a computer-implemented method are described herein are directed to a Candidate Engine. The Candidate Engine generates a key(s) based on respective shared attributes between first profile data of a first member account and second profile data of a second member account in a social network service, The Candidate Engine assembles, according to encoded rules of a prediction model, feature vector data for each key. The encoded rules comprises at least one pre-defined feature predictive of an affinity between the first member account and the second member account. The Candidate Engine processes, according to the prediction model, the feature vector data for each key. The Candidate Engine receives predictive output from the prediction model.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A computer system, comprising: a processor; a memory device holding an instruction set executable on the processor to cause the computer system to perform operations comprising: generating at least one key based on respective shared attributes between first profile data of a first member account and second profile data of a second member account in a social network service; assembling, according to encoded rules of a prediction model, feature vector data for each key , wherein the encoded rules comprise at least one pre-defined feature predictive of an affinity between the first member account and the second member account; processing, according to the prediction model, the feature vector data for each key; and receiving predictive output from the prediction model, the predictive output indicative of the affinity between the first member account the second member account. 2. The computer system of claim 1, wherein generating at least one key based on respective shared attributes between first profile data of a first member account and a second profile data in a social network service comprises: generating a key comprising a shared hierarchical data attribute and a shared hierarchical geographic attribute. 3. The computer system of claim 2, wherein the encoded rules of the prediction model comprises a respective pre-defined feature based on each type of generated key and a respective learned coefficient for each type of generated key, wherein the learned coefficient represents a degree of importance of the generated key in determining the affinity between the first member account the second member. 4. The computer system of claim 2, wherein generating a key comprising a shared data hierarchy attribute and a shared geographical hierarchy attribute comprises: identifying a shared geographical descriptor, in a pre-defined geographic hierarchy, present in both the first profile data and the second profile data; and inserting the shared geographical descriptor in the key. 5. The computer system of claim 4, wherein the pre-defined geographic hierarchy comprises a first level for a country descriptor, a second level for a region descriptor and a third level for a city descriptor. 6. The computer system of claim 4, wherein generating a key comprising a shared data hierarchy attribute and a shared geographical hierarchy attribute comprises: identifying a shared school descriptor, in a pre-defined school hierarchy, present in both the first profile data and the second profile data; and inserting the shared geographical descriptor in the key. 7. The computer system of claim 6, wherein the pre-defined school hierarchy comprises a first level for a school name descriptor, a second level for a time of attendance descriptor, a third level for a field of study descriptor and a fourth level for a degree obtained descriptor. 8. The computer system of claim 4, wherein generating a key comprising a shared data hierarchy attribute and a shared geographical hierarchy attribute comprises: identifying a shared industry descriptor, in a pre-defined industry hierarchy, present in both the first profile data and the second profile data; and inserting the shared industry descriptor in the key. 9. The computer system of claim 8, wherein the pre-defined industry hierarchy comprises a first level for industry descriptor, a second level for a company name descriptor, a third level for a job functional role descriptor and a fourth level for a job title descriptor. 10. A non-transitory computer-readable medium storing executable instructions thereon, which, when executed by a processor, cause the processor to perform operations including: generating at least one key based on respective shared attributes between first profile data of a first member account and second profile data of a second member account in a social network service; assembling, according to encoded rules of a prediction model, feature vector data for each key , wherein the encoded rules comprise at least one pre-defined feature predictive of an affinity between the first member account and the second member account; processing, according to the prediction model, the feature vector data for each key; and receiving predictive output from the prediction model, the predictive output indicative of the affinity between the first member account the second member account. 11. The non-transitory computer-readable medium of claim 10, wherein generating at least one key based on respective shared attributes between first profile data of a first member account and a second profile data in a social network service comprises: generating a key comprising a shared hierarchical data attribute and a shared hierarchical geographic attribute. 12. The non-transitory computer-readable medium of claim 11, wherein the encoded rules of the prediction model comprises a respective pre-defined feature based on each type of generated key and a respective learned coefficient for each type of generated key, wherein the learned coefficient represents a degree of importance of the generated key in determining the affinity between the first member account the second member. 13. The non-transitory computer-readable medium of claim 11, wherein generating a key comprising a shared data hierarchy attribute and a shared geographical hierarchy attribute comprises: identifying a shared geographical descriptor, in a pre-defined geographic hierarchy, present in both the first profile data and the second profile data; and inserting the shared geographical descriptor in the key. 14. The non-transitory computer-readable medium of claim 13, wherein the pre-defined geographic hierarchy comprises a first level for a country descriptor, a second level for a region descriptor and a third level for a city descriptor. 15. The non-transitory computer-readable medium of claim 13, wherein generating a key comprising a shared data hierarchy attribute and a shared geographical hierarchy attribute comprises: identifying a shared school descriptor, in a pre-defined school hierarchy, present in both the first profile data and the second profile data; and inserting the shared geographical descriptor in the key. 16. The non-transitory computer-readable medium of claim 15, wherein the pre-defined school hierarchy comprises a first level for a school name descriptor, a second level for a time of attendance descriptor, a third level for a field of study descriptor and a fourth level for a degree obtained descriptor. 17. The non-transitory computer-readable medium of claim 13, wherein generating a key comprising a shared data hierarchy attribute and a shared geographical hierarchy attribute comprises: identifying a shared industry descriptor, in a pre-defined industry hierarchy, present in both the first profile data and the second profile data; and inserting the shared industry descriptor in the key. 18. The non-transitory computer-readable medium of claim 17, wherein the pre-defined industry hierarchy comprises a first level for industry descriptor, a second level for a company name descriptor, a third level for a job functional role descriptor and a fourth level for a. job title descriptor. 19. A computer-implemented method, comprising: generating, via at least one hardware processor, at least one key based on respective shared attributes between first profile data of a first member account and second profile data of a second member account in a social network service; assembling, according to encoded rules of a prediction model, feature vector data for each key , wherein the encoded rules comprise at least one pre-defined feature predictive of an affinity between the first member account and the second member account; processing, according to the prediction model, the feature vector data for each key; and receiving predictive output from the prediction model, the predictive output indicative of the affinity between the first member account the second member account. 20. The computer-implemented method of claim 19, wherein generating at least one key based on respective shared attributes between first profile data of a first member account and a second profile data in a social network service comprises: generating a key comprising a shared hierarchical data attribute and a shared. hierarchical geographic attribute.