More and more stock trading strategies are constructed using deep reinforcement learning (DRL) algorithms, but DRL methods originally widely used in the gaming community are not directly adaptable to financial data with low signal-to-noise ratios and unevenness, and thus suffer from performance shortcomings. In this paper, to capture the hidden information, we propose a DRL based stock trading system using cascaded LSTM, which first uses LSTM to extract the time-series features from stock daily data, and then the features extracted are fed to the agent for training, while the strategy functions in reinforcement learning also use another LSTM for training. Experiments in DJI in the US market and SSE50 in the Chinese stock market show that our model outperforms previous baseline models in terms of cumulative returns and Sharp ratio, and this advantage is more significant in the Chinese stock market, a merging market. It indicates that our proposed method is a promising way to build a automated stock trading system.
translated by 谷歌翻译
With the improvement of arithmetic power and algorithm accuracy of personal devices, biological features are increasingly widely used in personal identification, and palm vein recognition has rich extractable features and has been widely studied in recent years. However, traditional recognition methods are poorly robust and susceptible to environmental influences such as reflections and noise. In this paper, a convolutional neural network based on VGG-16 transfer learning fused attention mechanism is used as the feature extraction network on the infrared palm vein dataset. The palm vein classification task is first trained using palmprint classification methods, followed by matching using a similarity function, in which we propose the multi-task loss function to improve the accuracy of the matching task. In order to verify the robustness of the model, some experiments were carried out on datasets from different sources. Then, we used K-means clustering to determine the adaptive matching threshold and finally achieved an accuracy rate of 98.89% on prediction set. At the same time, the matching is with high efficiency which takes an average of 0.13 seconds per palm vein pair, and that means our method can be adopted in practice.
translated by 谷歌翻译
在这个时代,智能和低功率视网膜假体的需求高度要求,在这个时代,可穿戴和可植入的设备用于众多医疗保健应用。在本文中,我们提出了一个节能动态场景处理框架(Spikesee),该框架结合了尖峰代表编码技术和生物启发的尖峰复发性神经网络(SRNN)模型,以实现智能处理和极端的低功耗计算。尖峰表示编码技术可以用稀疏的尖峰火车来解释动态场景,从而减少数据量。采用受人视网膜特殊结构和尖峰加工方法的启发的SRNN模型,以预测神经节细胞对动态场景的响应。实验结果表明,所提出的SRNN模型的Pearson相关系数达到0.93,这表现优于视网膜假体的最先进的处理框架。得益于尖峰表示和SRNN处理,该模型可以以无倍数的方式提取视觉特征。与基于卷积的复发神经网络(CRNN)处理框架相比,该框架可实现12倍的功率。我们提出的Spikesee可以通过较低的能源消耗来更准确地预测神经节细胞的响应,从而减轻了视网膜假体的精度和功率问题,并为可穿戴或可植入的假体提供了潜在的解决方案。
translated by 谷歌翻译
在本文中,我们介绍了2022年多模式情感分析挑战(MUSE)的解决方案,其中包括Muse-Humor,Muse-Rection和Muse Surns Sub-Challenges。 2022年穆斯穆斯(Muse 2022)着重于幽默检测,情绪反应和多模式的情感压力,利用不同的方式和数据集。在我们的工作中,提取了不同种类的多模式特征,包括声学,视觉,文本和生物学特征。这些功能由Temma和Gru融合到自发机制框架中。在本文中,1)提取了一些新的音频功能,面部表达功能和段落级文本嵌入以进行准确的改进。 2)我们通过挖掘和融合多模式特征来显着提高多模式情感预测的准确性和可靠性。 3)在模型培训中应用有效的数据增强策略,以减轻样本不平衡问题并防止模型形成学习有偏见的主题字符。对于博物馆的子挑战,我们的模型获得了0.8932的AUC分数。对于Muse Rection子挑战,我们在测试集上的Pearson相关系数为0.3879,它的表现优于所有其他参与者。对于Muse Surst Sub-Challenge,我们的方法在测试数据集上的唤醒和价值都优于基线,达到了0.5151的最终综合结果。
translated by 谷歌翻译
面部表达是传达人类情绪状态和意图的重要因素。尽管在面部表达识别任务(FER)任务中已经取得了显着进步,但由于表达模式的巨大变化和不可避免的数据不确定性而引起的挑战仍然存在。在本文中,我们提出了中级表示增强(MRE)和嵌入图形抑制(GUS)的图表,以解决这些问题。一方面,引入MRE是为了避免表达表示学习以有限数量的高度歧视模式主导。另一方面,引入GUS以抑制表示空间中的特征歧义。所提出的方法不仅具有更强的概括能力来处理表达模式的不同变化,而且具有更强的稳健性来捕获表达表示。对AFF-WILD2的实验评估已验证了该方法的有效性。
translated by 谷歌翻译
对图形的对抗攻击对图形机器学习(GML)模型的鲁棒性构成了重大威胁。当然,攻击者和捍卫者之间存在一场易于升级的军备竞赛。但是,在相同和现实的条件下,双方背后的策略往往不相当。为了弥合这一差距,我们展示了Graph稳健性基准(GRB),其目的是为GML模型的对抗鲁棒性提供可扩展,统一,模块化和可重复的评估。 GRB将攻击和防御过程标准化1)开发可扩展和多样化的数据集,2)模块化攻击和防御实现,以及统一精细方案中的评估协议。通过利用GRB管道,最终用户可以专注于具有自动数据处理和实验评估的强大GML模型的开发。为了支持对图形对抗性学习的开放和可重复研究,GRB还遍布不同方案的公共排行榜。作为起点,我们对基准基线技术进行了广泛的实验。 GRB是开放的,欢迎社区的贡献。数据集,代码,排行榜可在https://cogdl.ai/grb/home获得。
translated by 谷歌翻译
图形神经网络(GNNS)在各种现实世界应用中取得了有希望的性能。然而,最近的研究表明,GNN易受对抗性发作的影响。在本文中,我们研究了关于图表 - 图 - 图注射攻击(GIA)的最近引入的现实攻击情景。在GIA场景中,对手无法修改输入图的现有链路结构和节点属性,而是通过将逆势节点注入到它中来执行攻击。我们对GIA环境下GNN的拓扑脆弱性分析,基于该拓扑结构,我们提出了用于有效注射攻击的拓扑缺陷图注射攻击(TDGIA)。 TDGIA首先介绍了拓扑有缺陷的边缘选择策略,可以选择与注入的原始节点连接。然后,它设计平滑功能优化目标,以生成注入节点的功能。大规模数据集的广泛实验表明,TDGIA可以一致而明显优于攻击数十个防御GNN模型中的各种攻击基线。值得注意的是,来自TDGIA的目标GNNS上的性能下降比KDD-CUP 2020上的数百个提交所带来的最佳攻击解决方案所带来的损坏多于两倍。
translated by 谷歌翻译
常规域中的文本到图像生成长期以来一直是一个开放问题,这需要强大的生成模型和跨模型理解。我们提出CogView,一个带VQ-VAE牌器的40亿参数变压器来推进此问题。我们还展示了各种下游任务的FineTuning策略,例如,风格学习,超分辨率,文本图像排名和时装设计,以及稳定预制雷岭的方法,例如,消除南损失。Cogview在模糊的MS Coco DataSet上实现最先进的FID,优于以前的基于GAN的模型和最近类似的工作Dall-e。
translated by 谷歌翻译
大型预训练的语言模型已经表现出了产生现实文本的强大功能。但是,控制生成结果仍然具有挑战性。以前的方法,例如提示远远不足,这限制了语言模型的使用。为了解决这一挑战,我们提出了一种创新的方法,逆提示,更好地控制文本生成。逆提示的核心思想是使用生成的文本来在波束搜索期间反转提示,这增强了提示和生成文本之间的相关性,并提供了更好的可控性。经验上,我们预先培训了大规模的汉语模型,在开放式诗歌生成和开放式长形问题的任务上使用人力评估进行系统研究。我们的研究结果表明,我们的提出方法显着优于基线,而我们的发电质量与某些任务中的某些任务接近人类性能。叙述者可以在https://pretrain.aminer.cn/apps/poetry.html上尝试我们的诗歌生成演示,而我们的QA演示可以在https://pretrain.aminer.cn/app/qa找到。对于研究人员来说,代码是在https://github.com/thudm/inverseprompting中提供的。
translated by 谷歌翻译
Graph Neural Networks (GNNs) have shown satisfying performance on various graph learning tasks. To achieve better fitting capability, most GNNs are with a large number of parameters, which makes these GNNs computationally expensive. Therefore, it is difficult to deploy them onto edge devices with scarce computational resources, e.g., mobile phones and wearable smart devices. Knowledge Distillation (KD) is a common solution to compress GNNs, where a light-weighted model (i.e., the student model) is encouraged to mimic the behavior of a computationally expensive GNN (i.e., the teacher GNN model). Nevertheless, most existing GNN-based KD methods lack fairness consideration. As a consequence, the student model usually inherits and even exaggerates the bias from the teacher GNN. To handle such a problem, we take initial steps towards fair knowledge distillation for GNNs. Specifically, we first formulate a novel problem of fair knowledge distillation for GNN-based teacher-student frameworks. Then we propose a principled framework named RELIANT to mitigate the bias exhibited by the student model. Notably, the design of RELIANT is decoupled from any specific teacher and student model structures, and thus can be easily adapted to various GNN-based KD frameworks. We perform extensive experiments on multiple real-world datasets, which corroborates that RELIANT achieves less biased GNN knowledge distillation while maintaining high prediction utility.
translated by 谷歌翻译