Above are papers related to the following paper: [Paper_ID] Paper #621555. 	[Title] Selection of Distance Metrics and Feature Subsets for k-Nearest Neighbor Classifiers [Abstract]  Please summarise all the given information.

Above are papers related to the following paper: [Paper_ID] Paper #1130243. 	[Title] Static Data Association with a Terrain-Based Prior Density [Abstract]  Please summarise all the given information.

Paper #621555 has the title `Selection of Distance Metrics and Feature Subsets for k-Nearest Neighbor Classifiers  
` and the abstract `nan`.
Question: Which category should Paper #621555 be classified as ?
You can select one from ['Neural_Networks', 'Case_Based', 'Theory', 'Reinforcement_Learning', 'Probabilistic_Methods', 'Rule_Learning', 'Genetic_Algorithms'].


Paper #621555 has the title `Selection of Distance Metrics and Feature Subsets for k-Nearest Neighbor Classifiers  
` and the abstract `nan`.
Question: Which category should Paper #621555 be classified as ?
You can select one from ['Neural_Networks', 'Case_Based', 'Theory', 'Reinforcement_Learning', 'Probabilistic_Methods', 'Rule_Learning', 'Genetic_Algorithms'].

This paper should be classified into: Neural_Networks