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DeepProbLog is a neural-symbolic framework that integrates probabilistic logic programming and neural  networks.It is realized by providing an interface between the probabilistic logic and the neural networks. Inference in probabilistic neural symbolic methods is  hard, since it combines logical theorem proving with probabilistic inference and neural network evaluation. In this work, we make the inference more efficient by extending an approximate inference algorithm from the field of statistical-relational AI. Instead of considering all possible proofs for a certain query, the system searches for the best proof.However, training a DeepProbLog model using approximate inference introduces additional challenges, as the best proof is unknown at the start of training which can lead to convergence towards a local optimum. To be able to apply DeepProbLog on larger tasks, we propose: 1) a method for approximate inference using an A*-like search, called DPLA* 2) an exploration strategy for proving in a neural-symbolic setting, and 3) a parametric heuristic to guide the proof search. We empirically evaluate the performance and scalability of the new approach, and also compare the resulting approach to other neural-symbolic systems.The experiments show that DPLA* achieves a speed up of up to 2-3 orders of magnitude in some cases.

Approximate Inference for Neural Probabilistic Logic Programming