human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge groups papers that share a common citing paper.

Details of the hypergraph:
Center hyperedge (induced by source paper "Worst-case Quadratic Loss Bounds for Prediction Using Linear Functions and Gradient Descent"):
  Abstract: In this paper we study the performance of gradient descent when applied to the problem of on-line linear prediction in arbitrary inner product spaces. We prove worst-case bounds on the sum of the squared prediction errors under various assumptions concerning the amount of a priori information about the sequence to predict. The algorithms we use are variants and extensions of on-line gradient descent. Whereas our algorithms always predict using linear functions as hypotheses, none of our results requires the data to be linearly related. In fact, the bounds proved on the total prediction loss are typically expressed as a function of the total loss of the best fixed linear predictor with bounded norm. All the upper bounds are tight to within constants. Matching lower bounds are provided in some cases. Finally, we apply our results to the problem of on-line prediction for classes of smooth functions.

Includes members:
  Member "How to Use Expert Advice (Extended Abstract)":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "Update rules for parameter estimation in Bayesian networks")
  Member "ON-LINE LEARNING OF LINEAR FUNCTIONS":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "Improved Bounds about On-line Learning of Smooth Functions of a Single Variable")
  Member "Improved Bounds about On-line Learning of Smooth Functions of a Single Variable":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "ON-LINE LEARNING OF LINEAR FUNCTIONS")

Question: Please tell me which class the citing paper (i.e., the source paper of the center hyperedge) belongs to. The 7 classes are: Neural_Networks, Reinforcement_Learning, Probabilistic_Methods, Theory, Genetic_Algorithms, Case_Based, Rule_Learning. Directly output the class name.

gpt: Theory