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In this paper, we propose the first deep reinforce-ment learning framework to estimate the optimal Dynamic Treat-ment Regimes from observational medical data. This framework is more flexible and adaptive for high dimensional action and state spaces than existing reinforcement learning methods to model real life complexity in heterogeneous disease progression and treatment choices, with the goal to...
Single term based document representations, e.g. bag-of-words, have been widely accepted in the machine learning, information retrieval and text mining community. One notable limitation of such methods is that they do not consider the rich information resident in the semantic relations among terms. This paper reports our approach of concepts handling in document representation and its effect on the...
Undersampling is a popular method in dealing with class-imbalance problems, which uses only a subset of the majority class and thus is very efficient. The main deficiency is that many majority class examples are ignored. We propose two algorithms to overcome this deficiency. EasyEnsemble samples several subsets from the majority class, trains a learner using each of them, and combines the outputs...
Text chunking is an effective method to decrease the difficulty of natural language parsing. In this paper, a statistical method based on hidden Markov model (HMM) is used for Chinese text chunking. Moreover, a transformation based error-driven learning approach is adopted to improve the performance. The definition of transformation rule templates is the key problem of this machine learning approach...
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