11 results about "Latent Dirichlet allocation" patented technology

The application provides a political orientation network public opinion manipulator detection model training method, a detection method and a device, comprising: constructing a training data set, each sample of which contains tweets collected from a social network platform; using a latent Dirichlet distribution to model the theme of the training data set, screening out political direction data to construct a political data set; constructing an initial detection model, which includes a feature selection module and a classification module; inputting the political data set, extracting features by the feature selection module, classifying by the classification module, and outputting a predicted classification result; training the initial detection model using the political data set, constructing a loss optimization model of the predicted classification result and the true classification; evaluating and selecting the best classification algorithm in terms of classification performance as the final classification algorithm of the classification model to obtain a detection model. The training method of the application guarantees the class balance ratio of the training set, has high training efficiency, and the detection model obtained by training has high precision and high performance.

This invention belongs to the field of conversation recommendation technology, and specifically provides a conversation recommendation method based on multi-intent expression using cross-category heterogeneous hypergraphs. The method includes preprocessed data and the following steps: S1: The preprocessed data is input to a category recognition processing module, which uses a Latent Dirichlet Allocation (LDA) model to mine the latent category distribution of items and outputs category-classified items; S2: The preprocessed data and category-classified items are respectively input to a self-loop star graph module and a cross-category heterogeneous hypergraph module to construct the graph structure, outputting a self-loop star graph and a cross-category heterogeneous hypergraph. This invention combines the conversational intra-conversational structure modeling of self-loop star graphs with the semantic association expression of cross-category heterogeneous hypergraphs to construct a multi-intent modeling framework that can simultaneously capture local behavioral dependencies and global interest transfers. It dynamically identifies latent intent patterns and multi-category preference features even without long-term user history information, thereby significantly improving the accuracy, personalization, and robustness of conversation recommendations.

The present application relates to biomedical literature content retrieval technology, in particular to a biomedical literature long query content retrieval method, device and computer equipment, the method comprises the following steps: constructing a biomedical literature hierarchical tree, and selecting a storage document segment based on the relevance of a corresponding subject word of a child node to a document segment of a retrieval library document; preprocessing a long query text input by a user to obtain to-be-queried content; performing subject reasoning on the to-be-queried content based on a latent Dirichlet allocation method on the biomedical literature hierarchical tree from top to bottom and layer by layer, that is, calculating the subject relevance of the to-be-queried content to other nodes except the root node from top to bottom, if the relevance is greater than a set threshold, continue to find the next layer of nodes of the child node; if the queried child node is a leaf node, end the subject reasoning, and find N documents closest to the to-be-queried content according to the document subject relevance distribution of the document segment on the leaf node; the present application improves the retrieval accuracy of biomedical literature.

This invention discloses a cold chain logistics document analysis method based on multimodal and dynamic correlation, comprising the following steps: constructing a cold chain logistics document thesaurus and manually annotating the subject keywords of preprocessed cold chain logistics documents; constructing an analysis model, which includes a keyword extraction module, a ranking module, a temporal enhancement module, a business feature module, and a technical feature module based on a latent Dirichlet allocation word vector model; obtaining subject keywords that integrate temporal, business, and technical features based on manually annotated subject keywords; constructing a loss function and optimizing the parameters of the constructed analysis model by using a preset label minimization loss function; and constructing a dynamic correlation analysis between business and technical subjects. This method provides quantitative decision support for prioritizing technology investment, providing supply chain risk warnings, and determining business innovation directions in the cold chain logistics field, significantly improving resource allocation efficiency and policy response speed.

A device and method for reviewing literature by using Latent Dirichlet Allocation (LDA) is proposed. The device may include a pre-processing unit extracting text data for modeling, and a modeling unit automatically classifying topics as many as a set number (K) and generating a probability distribution of the topics by literature and a probability distribution for words by topic. The device may also include a clustering unit updating the number (K) of the topics, an interest analysis unit confirming trends by topic over time, and a generality analysis unit quantitatively confirming a research scope of each specific topic. The device may further include a similarity analysis unit quantitatively confirming a similarity between the topics, a network analysis unit quantitatively confirming a correlation between the topics, and a display displaying the trends by topic over time, research scope of each specific topic, similarity between the topics, and correlation between the topics.

The application discloses a social media public participation degree prediction method, medium and computer equipment, wherein the method comprises the following steps: selecting a social media platform, obtaining a green travel related original data set on the social media platform, and obtaining high-quality samples after cleaning and screening; text preprocessing is performed on the high-quality samples to obtain effective samples, and a latent Dirichlet allocation model is selected for training and prediction, and the clustering effect of the latent Dirichlet allocation model is highly dependent on the selection of the number of themes; the number of themes is determined by comprehensively considering the perplexity and consistency evaluation indexes; text themes are extracted according to the theme recognition result of the latent Dirichlet allocation model, a prediction variable set is constructed by fusing multi-modal features, a social media public participation degree prediction model is established, and a participation degree prediction result and key driving factors are output. The application discloses the mechanism of the social media in spreading green travel, and provides a scientific and direct basis for customizing and optimizing a spreading strategy.

The application discloses a manufacturing industry digital quality management core element extraction method and electronic equipment, and belongs to the technical field of data processing. The method comprises the following steps: obtaining raw material purchasing data and usage data from a database according to a first text; obtaining a first text sequence based on the purchasing data and the usage data; extracting a named entity in the first text sequence by using a first large language model to obtain a first named entity sequence; processing the first text sequence by using an implicit Dirichlet distribution to obtain a first element list; performing vectorization on the first named entity sequence to obtain a first vector set corresponding to the first named entity sequence; obtaining a second vector set corresponding to the first named entity sequence according to the correlation degree between words in the first element list and a quality management theme; and determining the correlation degree between elements in the first element list based on the first vector set and the second vector set. The application can automatically discover complex correlations between elements.

A method for evaluating a driving risk level in a tunnel based on vehicle bus data and a system therefor are provided. The method uses the Controller Area Network (CAN) bus data collected in a vehicle driving process, designs and extracts a driving risk characteristic feature index reflecting the driving behavior of a driver through a sliding time window method, writes a feature codebook to symbolize an extracted sequence feature, and then randomly samples all of the samples, and based on the sampled symbolic data, using a Latent Dirichlet Allocation (LDA) theme model to evaluate the driving risk level. The training method of the model is to acquire the optimal number of risk levels by evaluating the perplexity and the coherence scores, and to analyze the driving risk of the driving data in all of the samples.

The invention discloses a manufacturing industry digital intelligent quality management core element extraction method and electronic equipment, and belongs to the technical field of data processing. The method comprises the following steps: retrieving from a database according to a first text to obtain purchase data and use data of raw materials; obtaining a first text sequence based on the purchase data and the use data; using a first large language model to extract named entities in the first text sequence to obtain a first named entity sequence; processing the first text sequence by using implicit Dirichlet distribution to obtain a first element list; vectorizing the first named entity sequence to obtain a first vector set corresponding to the first named entity sequence; obtaining a second vector set corresponding to the first named entity sequence according to the association degree of words in the first element list and the quality management theme; and determining the correlation degree between the elements in the first element list based on the first vector set and the second vector set. According to the method, complex association between elements can be automatically found.

The invention discloses an automobile public opinion analysis method, and relates to the technical field of public opinion analysis, and the method comprises the steps: obtaining automobile public opinion data; inputting the automobile public opinion data into a trained sentiment classification model to obtain a sentiment classification result of the automobile public opinion information; mining themes in the automobile public opinion data by using a potential Dirichlet allocation model to obtain theme keywords; constructing a co-occurrence matrix based on the subject keywords, generating a text network graph and analyzing the text network graph to obtain a text network analysis result; and obtaining a public opinion analysis result based on the sentiment classification result, the theme keyword and the text network analysis result. According to the scheme, the internal relation between each theme and the keyword is captured, the automobile manufacturer is helped to grasp the opinions of the public on the brand in real time, and a targeted strategy is formulated.

The invention relates to a multi-field marketing topic robot detection method based on feature fusion, and belongs to the technical field of social network data analysis and machine learning model detection. Constructing weighted metadata feature representation, vectorizing metadata such as a user introduction, a concerned number and a concerned number through an embedded layer, and introducing an attention mechanism to calculate an attribute weight through multi-layer perceptron nonlinear transformation to obtain weighted metadata features; performing domain division on the text topics based on a potential Dirichlet allocation model, constructing a multi-domain relation network diagram by taking likes, collection, forwarding and comments of users in different domain topics as edges, and fusing weighted metadata features into the diagram; extracting multi-domain social relation features in the domain relation network by using fine granularity of a graph neural network; a long-short-term memory network model based on multiple fields is constructed, user multi-time slice behavior features are extracted to form a time sequence feature matrix, and the marketing topic robot is effectively detected and recognized in combination with social relation features.