目的:利用命名实体识别(Named Entity Recognition)技术识别文本中出现的中药名词和方剂名词,并比较两种命名实体识别方法在识别中药名词和方剂名词时的表现。方法:方法一为利用现有的分词工具(如'结巴'中文分词工具等)对文本...目的:利用命名实体识别(Named Entity Recognition)技术识别文本中出现的中药名词和方剂名词,并比较两种命名实体识别方法在识别中药名词和方剂名词时的表现。方法:方法一为利用现有的分词工具(如'结巴'中文分词工具等)对文本进行分词,之后使用分词后的结果进行中药名词和方剂名词的匹配。方法二为搭建并训练用于中药名词和方剂名词识别的双向长短期记忆(Bidirectional Long Short Term Memory,BLSTM)神经网络模型。首先,采用两种可行的方法实现命名实体识别。其次,比较这两种方法的表现。结果:现有分词工具对中药名词和方剂名词的分词不准确,因此,会导致接下来的匹配阶段出现错误。而通过BLSTM神经网络模型进行命名实体识别,不但可以避免分词错误,而且在实验中表现出较强的歧义处理能力。结论:在应用命名实体识别技术于识别中药名词和方剂名词时,相比使用分词工具先分词后识别,通过训练神经网络模型对中药名词和方剂名词直接识别的方法更合适。展开更多
目的时序动作检测(temporal action detection)作为计算机视觉领域的一个热点课题,其目的是检测视频中动作发生的具体区间,并确定动作的类别。这一课题在现实生活中具有深远的实际意义。如何在长视频中快速定位且实现时序动作检测仍然...目的时序动作检测(temporal action detection)作为计算机视觉领域的一个热点课题,其目的是检测视频中动作发生的具体区间,并确定动作的类别。这一课题在现实生活中具有深远的实际意义。如何在长视频中快速定位且实现时序动作检测仍然面临挑战。为此,本文致力于定位并优化动作发生时域的候选集,提出了时域候选区域优化的时序动作检测方法TPO(temporal proposal optimization)。方法采用卷积神经网络(convolutional neural network,CNN)和双向长短期记忆网络(bidirectional long short term memory,BLSTM)来捕捉视频的局部时序关联性和全局时序信息;并引入联级时序分类优化(connectionist temporal classification,CTC)方法,评估每个时序位置的边界概率和动作概率得分;最后,融合两者的概率得分曲线,优化时域候选区域候选并排序,最终实现时序上的动作检测。结果在Activity Net v1.3数据集上进行实验验证,TPO在各评价指标,如一定时域候选数量下的平均召回率AR@100(average recall@100),曲线下的面积AUC(area under a curve)和平均均值平均精度m AP(mean average precision)上分别达到74.66、66.32、30.5,而各阈值下的均值平均精度m AP@Io U(m AP@intersection over union)在阈值为0.75和0.95时也分别达到了30.73和8.22,与SSN(structured segment network)、TCN(temporal context network)、Prop-SSAD(single shot action detector for proposal)、CTAP(complementary temporal action proposal)和BSN(boundary sensitive network)等方法相比,TPO的所有性能指标均有提高。结论本文提出的模型兼顾了视频的全局时序信息和局部时序信息,使得预测的动作候选区域边界更为准确和灵活,同时也验证了候选区域的准确性能够有效提高时序动作检测的精确度。展开更多
Since a complete DNA chain contains a large data (usually billions of nucleotides), it’s challenging to figure out the function of each sequence segment. Several powerful predictive models for the function of DNA seq...Since a complete DNA chain contains a large data (usually billions of nucleotides), it’s challenging to figure out the function of each sequence segment. Several powerful predictive models for the function of DNA sequence, including, CNN (convolutional neural network), RNN (recurrent neural network), and LSTM [1] (long short-term memory) have been proposed. However, all of them have some flaws. For example, the RNN can hardly have long-term memory. Here, we build on one of these models, DanQ, which uses CNN and LSTM together. We extend DanQ by developing an improved DanQ model and applying it to predict the function of DNA sequence more efficiently. In the most primitive DanQ model, the regulatory grammar is learned by the regulatory motifs captured by the convolution layer and the long-term dependencies between the motifs captured by the recurrent layer, so as to increase the prediction accuracy. Through the testing of some models, DanQ has greatly improved in some indicators. For the regulatory markers, DanQ achieves improvements above 50% of the area under the curve, via the measurement of the precision-recall curve.展开更多
双向长短时记忆(bidirectional lorg short term memory,BLSTM)是一种特殊的递归神经网络(recurrent neural network,RNN),能够有效地对语音的长时上下文进行建模。该文提出一种基于深度BLSTM的语音驱动面部动画合成方法,利用说话人的...双向长短时记忆(bidirectional lorg short term memory,BLSTM)是一种特殊的递归神经网络(recurrent neural network,RNN),能够有效地对语音的长时上下文进行建模。该文提出一种基于深度BLSTM的语音驱动面部动画合成方法,利用说话人的音视频双模态信息训练BLSTM-RNN神经网络,采用主动外观模型(active appearance model,AAM)对人脸图像进行建模,将AAM模型参数作为网络输出,研究网络结构和不同语音特征输入对动画合成效果的影响。基于LIPS2008标准评测库的实验结果表明:具有BLSTM层的网络效果明显优于前向网络的,基于BLSTM-前向-BLSTM 256节点(BFB256)的三层模型结构的效果最佳,FBank、基频和能量组合可以进一步提升动画合成效果。展开更多
文摘目的:利用命名实体识别(Named Entity Recognition)技术识别文本中出现的中药名词和方剂名词,并比较两种命名实体识别方法在识别中药名词和方剂名词时的表现。方法:方法一为利用现有的分词工具(如'结巴'中文分词工具等)对文本进行分词,之后使用分词后的结果进行中药名词和方剂名词的匹配。方法二为搭建并训练用于中药名词和方剂名词识别的双向长短期记忆(Bidirectional Long Short Term Memory,BLSTM)神经网络模型。首先,采用两种可行的方法实现命名实体识别。其次,比较这两种方法的表现。结果:现有分词工具对中药名词和方剂名词的分词不准确,因此,会导致接下来的匹配阶段出现错误。而通过BLSTM神经网络模型进行命名实体识别,不但可以避免分词错误,而且在实验中表现出较强的歧义处理能力。结论:在应用命名实体识别技术于识别中药名词和方剂名词时,相比使用分词工具先分词后识别,通过训练神经网络模型对中药名词和方剂名词直接识别的方法更合适。
文摘目的时序动作检测(temporal action detection)作为计算机视觉领域的一个热点课题,其目的是检测视频中动作发生的具体区间,并确定动作的类别。这一课题在现实生活中具有深远的实际意义。如何在长视频中快速定位且实现时序动作检测仍然面临挑战。为此,本文致力于定位并优化动作发生时域的候选集,提出了时域候选区域优化的时序动作检测方法TPO(temporal proposal optimization)。方法采用卷积神经网络(convolutional neural network,CNN)和双向长短期记忆网络(bidirectional long short term memory,BLSTM)来捕捉视频的局部时序关联性和全局时序信息;并引入联级时序分类优化(connectionist temporal classification,CTC)方法,评估每个时序位置的边界概率和动作概率得分;最后,融合两者的概率得分曲线,优化时域候选区域候选并排序,最终实现时序上的动作检测。结果在Activity Net v1.3数据集上进行实验验证,TPO在各评价指标,如一定时域候选数量下的平均召回率AR@100(average recall@100),曲线下的面积AUC(area under a curve)和平均均值平均精度m AP(mean average precision)上分别达到74.66、66.32、30.5,而各阈值下的均值平均精度m AP@Io U(m AP@intersection over union)在阈值为0.75和0.95时也分别达到了30.73和8.22,与SSN(structured segment network)、TCN(temporal context network)、Prop-SSAD(single shot action detector for proposal)、CTAP(complementary temporal action proposal)和BSN(boundary sensitive network)等方法相比,TPO的所有性能指标均有提高。结论本文提出的模型兼顾了视频的全局时序信息和局部时序信息,使得预测的动作候选区域边界更为准确和灵活,同时也验证了候选区域的准确性能够有效提高时序动作检测的精确度。
文摘Since a complete DNA chain contains a large data (usually billions of nucleotides), it’s challenging to figure out the function of each sequence segment. Several powerful predictive models for the function of DNA sequence, including, CNN (convolutional neural network), RNN (recurrent neural network), and LSTM [1] (long short-term memory) have been proposed. However, all of them have some flaws. For example, the RNN can hardly have long-term memory. Here, we build on one of these models, DanQ, which uses CNN and LSTM together. We extend DanQ by developing an improved DanQ model and applying it to predict the function of DNA sequence more efficiently. In the most primitive DanQ model, the regulatory grammar is learned by the regulatory motifs captured by the convolution layer and the long-term dependencies between the motifs captured by the recurrent layer, so as to increase the prediction accuracy. Through the testing of some models, DanQ has greatly improved in some indicators. For the regulatory markers, DanQ achieves improvements above 50% of the area under the curve, via the measurement of the precision-recall curve.
文摘双向长短时记忆(bidirectional lorg short term memory,BLSTM)是一种特殊的递归神经网络(recurrent neural network,RNN),能够有效地对语音的长时上下文进行建模。该文提出一种基于深度BLSTM的语音驱动面部动画合成方法,利用说话人的音视频双模态信息训练BLSTM-RNN神经网络,采用主动外观模型(active appearance model,AAM)对人脸图像进行建模,将AAM模型参数作为网络输出,研究网络结构和不同语音特征输入对动画合成效果的影响。基于LIPS2008标准评测库的实验结果表明:具有BLSTM层的网络效果明显优于前向网络的,基于BLSTM-前向-BLSTM 256节点(BFB256)的三层模型结构的效果最佳,FBank、基频和能量组合可以进一步提升动画合成效果。
