human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent groups of papers sharing a common citing paper.

Details of the hypergraph:
Center node: "Coupled hidden Markov models for modeling interacting processes"
  Abstract: c flMIT Media Lab Perceptual Computing / Learning and Common Sense Technical Report 405 3nov96, revised 3jun97 Abstract We present methods for coupling hidden Markov models (hmms) to model systems of multiple interacting processes. The resulting models have multiple state variables that are temporally coupled via matrices of conditional probabilities. We introduce a deterministic O(T (CN ) 2 ) approximation for maximum a posterior (MAP) state estimation which enables fast classification and parameter estimation via expectation maximization. An "N-heads" dynamic programming algorithm samples from the highest probability paths through a compact state trellis, minimizing an upper bound on the cross entropy with the full (combinatoric) dynamic programming problem. The complexity is O(T (CN ) 2 ) for C chains of N states apiece observing T data points, compared with O(T N 2C ) for naive (Cartesian product), exact (state clustering), and stochastic (Monte Carlo) methods applied to the same inference problem. In several experiments examining training time, model likelihoods, classification accuracy, and robustness to initial conditions, coupled hmms compared favorably with conventional hmms and with energy-based approaches to coupled inference chains. We demonstrate and compare these algorithms on synthetic and real data, including interpretation of video.

Connected through hyperedge HE-1 (induced by source paper "Coupled hidden Markov models for complex action recognition"):
  with members:
    - "Hidden Markov decision trees"
    - "Factorial Hidden Markov Models"
    - "Probabilistic Independence Networks for Hidden Markov Probability Models"
    - "Boltzmann Chains and Hidden Markov Models"

Question: Please tell me which class the center node 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: Probabilistic_Methods