In social networks,user attention affects the user’s decision-making,resulting in a performance alteration of the recommendation systems.Existing systems make recommendations mainly according to users’preferences wi...In social networks,user attention affects the user’s decision-making,resulting in a performance alteration of the recommendation systems.Existing systems make recommendations mainly according to users’preferences with a particular focus on items.However,the significance of users’attention and the difference in the influence of different users and items are often ignored.Thus,this paper proposes an attention-based multi-layer friend recommendation model to mitigate information overload in social networks.We first constructed the basic user and item matrix via convolutional neural networks(CNN).Then,we obtained user preferences by using the relationships between users and items,which were later inputted into our model to learn the preferences between friends.The error performance of the proposed method was compared with the traditional solutions based on collaborative filtering.A comprehensive performance evaluation was also conducted using large-scale real-world datasets collected from three popular location-based social networks.The experimental results revealed that our proposal outperforms the traditional methods in terms of recommendation performance.展开更多
随着空间目标的数量逐渐增多、空中目标动态性日趋提升,对目标的观测定位问题变得愈发重要.由于需同时观测的目标多且目标动态性强,而星座观测资源有限,为了更高效地调用星座观测资源,需要动态调整多目标协同观测方案,使各目标均具有较...随着空间目标的数量逐渐增多、空中目标动态性日趋提升,对目标的观测定位问题变得愈发重要.由于需同时观测的目标多且目标动态性强,而星座观测资源有限,为了更高效地调用星座观测资源,需要动态调整多目标协同观测方案,使各目标均具有较好的定位精度,因此需解决星座协同观测多目标的任务规划问题.建立星座姿态轨道模型、目标飞行模型、目标协同探测及定位模型,提出基于几何精度衰减因子(geometric dilution of precision, GDOP)的目标观测定位误差预估模型及目标观测优先级模型,建立基于强化学习的协同观测任务规划框架,采用多头自注意力机制建立策略网络,以及近端策略优化算法开展任务规划算法训练.仿真验证论文提出的方法相比传统启发式方法提升了多目标观测精度和有效跟踪时间,相比遗传算法具有更快的计算速度.展开更多
现有的协同过滤推荐算法使用表示学习方法和匹配函数学习的方法来匹配用户喜欢的物品,但这不能充分表达用户对不同物品的真实偏好,且这些模型并不能有效捕获用户和物品交互时嵌入维度之间的相关性。为此,该文提出基于通道注意力的神经...现有的协同过滤推荐算法使用表示学习方法和匹配函数学习的方法来匹配用户喜欢的物品,但这不能充分表达用户对不同物品的真实偏好,且这些模型并不能有效捕获用户和物品交互时嵌入维度之间的相关性。为此,该文提出基于通道注意力的神经协同过滤模型NCFCA(Neural Collaborative Filtering based on Channel Attention)。首先,在网络中通过注意力机制对不同的物品分配不同的权重,来影响用户对物品的偏好程度;其次,模型利用卷积神经网络来提升用户和物品的关联性,并在卷积神经网络中加入通道注意力机制来挖掘丰富的语义信息;最后,利用广义矩阵分解方法来缓解因用户物品交互产生的数据稀疏问题并且将三个不同的模块(A-MLP、E-CNN、GMF)融合在一起。在MovieLens 1M和Lastfm数据集上的大量实验表明,NCFCA模型的准确率有不同程度的提高,表现出较为优越的推荐性能。展开更多
文摘In social networks,user attention affects the user’s decision-making,resulting in a performance alteration of the recommendation systems.Existing systems make recommendations mainly according to users’preferences with a particular focus on items.However,the significance of users’attention and the difference in the influence of different users and items are often ignored.Thus,this paper proposes an attention-based multi-layer friend recommendation model to mitigate information overload in social networks.We first constructed the basic user and item matrix via convolutional neural networks(CNN).Then,we obtained user preferences by using the relationships between users and items,which were later inputted into our model to learn the preferences between friends.The error performance of the proposed method was compared with the traditional solutions based on collaborative filtering.A comprehensive performance evaluation was also conducted using large-scale real-world datasets collected from three popular location-based social networks.The experimental results revealed that our proposal outperforms the traditional methods in terms of recommendation performance.
文摘随着空间目标的数量逐渐增多、空中目标动态性日趋提升,对目标的观测定位问题变得愈发重要.由于需同时观测的目标多且目标动态性强,而星座观测资源有限,为了更高效地调用星座观测资源,需要动态调整多目标协同观测方案,使各目标均具有较好的定位精度,因此需解决星座协同观测多目标的任务规划问题.建立星座姿态轨道模型、目标飞行模型、目标协同探测及定位模型,提出基于几何精度衰减因子(geometric dilution of precision, GDOP)的目标观测定位误差预估模型及目标观测优先级模型,建立基于强化学习的协同观测任务规划框架,采用多头自注意力机制建立策略网络,以及近端策略优化算法开展任务规划算法训练.仿真验证论文提出的方法相比传统启发式方法提升了多目标观测精度和有效跟踪时间,相比遗传算法具有更快的计算速度.
文摘现有的协同过滤推荐算法使用表示学习方法和匹配函数学习的方法来匹配用户喜欢的物品,但这不能充分表达用户对不同物品的真实偏好,且这些模型并不能有效捕获用户和物品交互时嵌入维度之间的相关性。为此,该文提出基于通道注意力的神经协同过滤模型NCFCA(Neural Collaborative Filtering based on Channel Attention)。首先,在网络中通过注意力机制对不同的物品分配不同的权重,来影响用户对物品的偏好程度;其次,模型利用卷积神经网络来提升用户和物品的关联性,并在卷积神经网络中加入通道注意力机制来挖掘丰富的语义信息;最后,利用广义矩阵分解方法来缓解因用户物品交互产生的数据稀疏问题并且将三个不同的模块(A-MLP、E-CNN、GMF)融合在一起。在MovieLens 1M和Lastfm数据集上的大量实验表明,NCFCA模型的准确率有不同程度的提高,表现出较为优越的推荐性能。
