arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.01876physics.comp-ph
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自由能景观的Sobolev采样

Sobolev Sampling of Free Energy Landscapes

Pablo F. Zubieta Rico, Juan J. de Pablo

摘要:

这里介绍了一个家庭的快速采样方法的分子模拟系统具有崎岖的自由能景观。该方法代表了一种策略的推广,该策略包括随着模拟的进行而调整作为一个或多个集体变量的函数的自由能模型。随着系统从访问不同状态的频率和对应于这些状态的广义力估计通过相空间演变,逐渐建立这样的模型。这些方法的一个共同特征是,基础函数模型及其梯度很容易用相同的参数表示,从而比其他可用的采样技术更快、更有效地从模拟数据拟合模型。它们还消除了同时训练分离的神经网络的需要,同时保留了生成平滑和连续的功能估计的优点,该功能估计使得能够在支持网格之外偏置。实现的方法是相对简单的,更重要的是,他们被发现提供增益的几个数量级的计算效率超过现有的方法。

英文摘要:

A family of fast sampling methods is introduced here for molecular simulations of systems having rugged free energy landscapes. The methods represent a generalization of a strategy consisting of adjusting a model for the free energy as a function of one- or more collective variables as a simulation proceeds. Such a model is gradually built as a system evolves through phase space from both the frequency of visits to distinct states and generalized force estimates corresponding to such states. A common feature of the methods is that the underlying functional models and their gradients are easily expressed in terms of the same parameters, thereby providing faster and more effective fitting of the model from simulation data than other available sampling techniques. They also eliminate the need to train simultaneously separate neural networks, while retaining the advantage of generating smooth and continuous functional estimates that enable biasing outside the support grid. Implementation of the methods is relatively simple and, more importantly, they are found to provide gains of up to several orders of magnitude in computational efficiency over existing approaches.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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