[Retracted] Recommending Crowdfunding Project: A Graph Kernel-Based Link Prediction Method for Extremely Sparse Implicit Feedback

Table 3

Investor and project features.

Category	Feature	Type	Kernel
Investor	Location	Categorical	Linear
	Categories of backed/created projects	Categorical	Linear
Project	Project category	Categorical	Linear
	Project location	Categorical	Linear
	Project title	Textual	Linear
	Blurb in project description	Textual	Linear
	Reward terms	Textual	Linear
	Success or failure of fundraising campaign	Numerical	RBF
	Ongoing (funded percentage) or finished campaign	Numerical	RBF