78 results about "Stochastic matrix" patented technology

The invention discloses a sample categorization method based on a depth neural network. The open set category mining and extending method based on a depth neural network comprises steps of using a sample set comprising defined category samples to train a categorized model to be extended, obtaining categorization threshold value information, sending a sample set comprising undefined category samples into the categorization model to be extended, determining at least part of the undefined category samples according to the categorization threshold value information of the categorization model to be extended, artificially marking the undefined category samples, adding a number of columns of a weight transfer matrix in a categorization layer of the depth nerve network in order to increase a total number of model recognition categories, wherein the added weight columns comprise first information associated with global categorization and second information associated with connection between categories and using the undefined category samples which are artificially marked to increase the models which already finish training and updating. The open set category mining and extending method based on the depth neural network and the device thereof extend the depth neural network through modifying a depth neural network categorization layer weight transfer matrix, dynamically increases the number of the recognized categories so as to process the open set recognition problem and can be applied to a scene which is closer to a real scene.

A computer implemented method, system, and computer usable program code for classifying a data stream using high-order models. The data stream is divided into a plurality of data segments. A classifier is selected for each of the plurality of data segments. Each of a plurality of classifiers is clustered into states. A state transition matrix is computed for the states. The states of the state transition matrix specify one of the high-order models for classifying the data stream.

The invention belongs to the field of electric system forecasting, and provides a method for estimating a wind power forecasting error burst based on a hidden markov model. A wind power ultrashort term forecasted value reported to a dispatching department for a wind power plant is a deterministic point forecasting and given in a curved mode, but the problem that the forecasting accuracy is not high exists. By introducing an HMM model, modeling is performed on the wind power ultrashort term forecasting error, the error burst is processed by means of a locally weighted regression scatter plot smoothing method, the result accuracy is improved and the result conservation is lowered. The wind power forecasting error burst can be obtained, an error fluctuation state transition matrix can be obtained, and references are provided for dispatching operation.

A method segments a video. Audio frames of the video are classified with labels. Dominant labels are assigned to successive time intervals of consecutive labels. A semantic description is constructed for sliding time windows of the successive time intervals, in which the sliding time windows overlap in time, and the semantic description for each time window is a transition matrix determined from the dominant labels of the time intervals. A marker is determined from the transition matrices, in which a frequency of occurrence of the marker is between a low frequency threshold and a high frequency threshold. Then, the video is segmented at the locations of the markers.

Predicting a malfunction of a component of a unit includes providing a transition matrix of a parameter of the component, wherein the transition matrix includes for a number of discrete value states of the parameter probabilities to switch from one discrete value state to another within a certain time period; providing the conditional probability distribution for the malfunction given the discrete value states; providing a current discrete value state of the parameter; determining a conditional probability distribution of the discrete value states given the current discrete value state for a future point in time based on the current discrete value state and on the transition matrix by use of a Markov chain; and determining a probability for the malfunction for the future point in time based on the conditional probability distribution of the discrete value states for the future point in time and the conditional probability distribution for the malfunction.

The invention discloses a word segmentation processing method and device, a mobile terminal and a computer readable storage medium. The method comprises the following steps of: when a to-be-segmentedstatement is obtained, determining a target language type corresponding to the to-be-segmented statement; respectively first feature vectors corresponding individual characters, second feature vectorscorresponding to two words and third feature vectors corresponding to proper nouns in the to-be-segmented statement; determining current fourth feature vectors of the individual characters accordingto the first feature vectors, the second feature vectors and the third feature vectors; and carrying out word segmentation on the to-be-segmented statement according to a preset Chinese character label transfer matrix and the current fourth feature vectors of the individual characters. According to the method, word segmentation is carried out on to-be-segmented statements according to target language types corresponding to the to-be-segmented statements, so that the correctness of carrying out word segmentation on to-be-segmented statements in various language types is improved; and proper resources can be loaded according to requirements, so that storage spaces of mobile terminals are saved and the user experience is improved.

The present invention discloses an electronic text comparison method. Said method includes the following steps: (a), converting first electronic text segment and second electronic text segment into first matrix and second matrix respectively according to identical conversion rule, the described first matrix is identical to second matrix in size; (b), successively comparing elements of identical positions of first matrix and second matrix, and according to the compared result using defined comparison function to calculated similar coefficient; and (c), according to similar coefficient judging that the described first electronic text and second electronic text are similar or not, if the described similar coefficient is greater than specific threshold value, it expresses that first electronic data segment and second electronic data segment are similar. Besides, said invention also discloses a correspondent electronic text comparison system and a system for resisting garbage mail.

The invention discloses a visualization representing method for time series data. On the basis that time series feature representations of an SAX-based method are adopted as the visualization basis of time series data, the signifying character representations are converted into a Markov transfer matrix, then, a complex network is used for building time series graphic representations, and time series data visualization representations are obtained. The SAX-based discretization method is adopted for time series Markov matrix conversion for the first time, a corresponding Markov transfer matrix obtained after time series discretization is adopted, and time series statistical characteristics can be better extracted; compared with quantile discretization, SAX discretization can better extract time series statistical characteristics, under certain conditions, the complex network visualization result is frequently better than the quantile discretization result on a benchmark data set, the approximation accuracy is closer to that of original data distribution, and the visualization effect is better.

The invention discloses a measurement method for time-varying non-stationary network flow and belongs to the technical field of networks. A singular value decomposes historical flow to obtain an orthogonal basis matrix to replace a sparse base. A mode that a novel network tomography model is constructed through a gauss stochastic matrix is adopted to describe the flow from a source router to an objective router and a relation between a route choice and a link circuit load. The highly ill-conditioned problem of end-to-end flow reconfiguration can be converted to a convex optimization problem which can be solved by compressed sensing, and the application of a compressed sensing reconfiguration algorithm can accurately reconstruct the end-to-end flow. According to the measurement method for the time-varying non-stationary network flow, the end-to-end flow is reconstructed to conduct network operation such as network planning, route planning, novel routing protocol performance evaluation and network fault analysis.

The invention discloses an automatic tagging method and apparatus, a computer device and a storage medium. The method comprises the steps of performing word segmentation preprocessing on a to-be-tagged text to obtain a preprocessed text; inputting the preprocessed text to a TF-IDF algorithm model to obtain a keyword set of the to-be-tagged text; according to the keyword set of the to-be-tagged text, obtaining an initialized transfer matrix, performing multi-time iterative multiplication operation on the initialized transfer matrix and initial keyword probability distribution until convergenceto obtain final keyword probability distribution; and obtaining a corresponding row of a maximum probability value in the final keyword probability distribution, obtaining a keyword corresponding to the corresponding row of the maximum probability value, and setting the keyword as a tag of the to-be-tagged text. According to the method, an article is tagged by automatic learning, so that manual tagging is avoided, the tagging efficiency is improved, and the manpower cost is reduced.

The invention analyzes the security transmission rate of the SWIPT system in a full-dimensional antenna network by using theoretical tools such as a stochastic matrix and nonlinear optimization. An optimal 3D beam forming vector is acquired by maximizing the traversal transmission rate, and a system security transmission rate under the collected energy constraint is deduced. An optimal solution tomaximize the system security rate is obtained by combining a Lagrangian relaxation optimization algorithm with optimized transmitting power and power split ratio.

The invention provides a social network node influence sorting method and a system, which relate to the technical field of digital information processing. The method includes: collecting user personalhome page information, user posting information and user-to-user information, pretreating the personal home page information, user posting information and user-to-user information to form a trainingset and a test set; Then, according to the training set, establishing the transfer matrix model of the post, and performing simulation calculation of the transfer matrix model to obtain the optimal training parameters; Finally, according to the test set and the optimal training parameters, establishing a test transfer matrix for post forwarding, and calculating the test transfer matrix to obtain the ranking result of the influence of the social network nodes. The invention can discover the attention possibility of the hidden node so as to carry out influence ranking analysis on the data network whose dynamic information is incomplete and seriously missing. In the absence of social network data, it can more accurately analyze the impact of social network nodes.

The invention discloses a network representation method based on a depth network structure and node attribute, which comprehensively considers the influence of the network structure and node attributeinformation on the node, and learns the node characteristic representation through a neural network. The method Includes steps: an adjacency matrix and attribute relation matrix between nodes is constructed; the probability transfer matrix and attribute probability transfer matrix of the structure between nodes are obtained; according to the structural probability transfer matrix and the attribute probability transfer matrix, the multi-order probability relation matrix is obtained by using the personalized random walk model; the global information matrix is obtained by combining the multi-order probability relation matrix with the attenuation function; the global information matrix is inputted into the automatic encoder, and the low-dimensional feature representation of the network node is obtained by training the automatic encoder. The invention solves the problem of data sparsity, encodes the global information of nodes in the network into a low-dimensional, dense vector space by constructing a depth neural network, and ensures the accurate representation of nodes in the network.

The invention provides a milling three-dimensional stability forecasting method of a six-freedom-degree series robot and relates to the technical field of robot machining application. By means of themethod, the machining posture of the six-freedom-degree series robot is determined firstly, and the angle value of each joint of the robot is obtained; then the structural rigidity of the robot in three directions is obtained, and the milling cutting rigidity value of the robot is calculated and obtained; a homogeneous transformation matrix among all kinematics coordinate systems is obtained; theinherent frequency of various orders and corresponding modal shapes of the robot are obtained through analysis; the main rigidity direction of the robot is obtained, and the transfer matrix from cutting force to the main rigidity direction of the robot is determined; and finally, the machining direction is determined, and robot milling three-dimensional stability is used for judging and forecasting stability. By means of the milling three-dimensional stability forecasting method of the six-freedom-degree series robot, the machining feeding direction can be selected in advance, modal coupling fluttering in the milling process is avoided, and the quality of the machined surface is improved.

The present invention relates to an estimation method and apparatus for a direct position of a data domain of a mobile communication signal source. The method comprises the steps of collecting, by each observation station, original observation data; performing bottom layer data fusion on collected original observation data, and generating a direct positioning model comprising position information; building, based on a stochastic matrix asymptotic distribution theory, a cost function comprising a noise subspace and a signal subspace; and resolving the cost function, and outputting a final target position. By combining the original observation data of each observation station, thorough bottom layer fusion is performed on the received data, so as to reduce position information loss and improve the positioning precision. A brand-new cost function comprising both the signal subspace and the noise subspace is built based on the stochastic matrix asymptotic distribution theory, so that the signal source identification capability of the direct position determination is stronger in poor wireless communication environments such as low signal to noise ratio and fewer samples. Simulation experiments prove that the positioning precision is higher, and the performance is more stable.

The invention belongs to the technical field of mobile communications, and discloses a Markov mobility model suitable for a mobile Ad Hoc network in obstacle environment. The invention is characterized in that the construction process of the mobility model comprises the following steps: giving out the concept of the obstruction property and transparency of the obstacle, and analyzing two situations that the obstacle obstructs the node movement but does not influence communications, and obstructs the node movement and interrupts signal transmission; expressing the node movement condition by using a discrete-time Markov chain, and obtaining node location information by utilizing state identifications; and finally, giving out two state-transition matrix setting methods. Under different state-transition matrixes, the node has different movement characteristics. The invention can simulate the node movement conditions in a true environment, and is suitable for various obstacle environments.The state-transition matrixes are utilized to describe the node movement conditions, and the movement conditions with different characteristics are obtained by adjusting the parameters in the state-transition matrix.

The invention relates to a multi-image encryption method based on a hyperchaotic Chen system. The method aims at the problems that in an existing chaotic image encryption algorithm, system security isnot high, a plaintext attack cannot be resisted, encryption images are mutually independent, and efficiency is low. A hyperchaotic system generates a chaotic stochastic matrix related to plaintext images according to the plaintext images. Plaintext irrelevant deep diffusion is carried out on the plaintext images. One of the images is selected, plaintext related scrambling operation and plaintextirrelevant rapid bit diffusion are carried out on the image, and a first ciphertext is generated. Adaptive relation bit operation is carried out on the rest images, the rest ciphertexts are generated,and multi-image related image encryption is finished. An experiment simulation result shows that the algorithm has relatively high efficiency and relatively high plaintext attack resistance. The plaintext image corresponding to a ciphertext cannot be obtained through utilization of only one ciphertext, so security is relatively high. The algorithm has a good application scene.

The invention relates to the field of image tracking, in particular to an image tracking and positioning method and a system based on machine vision. The gray-scale image of the previous frame and thegray-scale image of the current frame taken by the panoramic camera are subjected to frame-to-frame difference to obtain a frame-to-frame difference image; morphologically etching is performed on theframe difference image with the first kernel to obtain the etched image and morphologically dilating is performed on the etched image with the second kernel to obtain the frame difference image; allthe outer contours in the detected frame difference image take the maximum contour as the detected moving object; the coordinate transfer matrix is used to transform the outer rectangular center to obtain the moving position of the camera; a zoom transfer matrix is used to transform the center of the outer rectangle, and the zoom coefficient is obtained; the first step is repeated by replacing thegray image of the previous frame with the gray image of the current frame. The method and the system of the invention can realize low computational complexity and high processing efficiency of the image tracking algorithm, and also improve the expandability of the product.

The invention discloses a random walk-based personnel intimacy calculation system and method. The system comprises a semantic network engine module and an intimacy calculation recommendation engine module, wherein the semantic network engine module is connected with the intimacy calculation recommendation engine module; the semantic network engine module comprises a data extraction module and a relation weight automatic identifier module; the data extraction module is connected with the relation weight automatic identifier module; the intimacy calculation recommendation engine module comprises a random walk training module added with a damping coefficient, and a Markov matrix convergence performance assessment module; and the random walk training module added with the damping coefficient is connected with the Markov matrix convergence performance assessment module. According to the system and the method, by improving a random walk algorithm, the method is higher in executive efficiency and more resources are saved; and by using a finally converged transfer matrix as intimacy measurement, a relationship among people is more accurate.

The invention discloses an ancestor polymorphism prediction method based on a big data artificial intelligence algorithm, which comprises the following steps of: A, constructing a training set according to population genome data; B, performing gene orientation on the group samples of the training set, and performing 1 and -1 encoding on the two haplotypes after orientation, and performing window division on the genome at the same time; c, selecting an optimal classifier through a voting strategy to form a window observation sequence, and taking the result of the classifier as the next step ofinput; d, constructing a transfer matrix and an emission matrix of the window, and establishing a hidden Markov model; and E, predicting probability distribution of a hidden state through the hidden Markov model, solving an optimal ancestor source result label, and outputting the optimal ancestor source result label as a final result. Through the method, the defect that an existing population polymorphism method has an important effect on genetic population research and positioning of some population-associated disease genome fragments can be overcome, and meanwhile the polymorphism of the chromosome genome fragments can be finely predicted.

The invention discloses a micro-service reliability prediction method. The method comprises the steps of obtaining first distributed log data in each micro-service, obtaining a fault type sequence andN faults in a prediction stage according to the first distributed log data, processing the fault type sequence by utilizing a one-step transition probability of a Markov chain to obtain a fault typetransition matrix, obtaining the fault type transition probability matrix according to the fault type transition matrix, and obtaining absolute probability vectors of N faults in the prediction stageaccording to the fault type transition probability matrix of each micro-service. According to the invention, the distributed log data of the micro-service system is used as the input, the fault of each micro-service is classified, and the type transition probability matrix of each micro-service is obtained, so that the reliability of each micro-service is obtained, and the reliability of the combined micro-service is predicted and analyzed by using the reliability of each micro-service.