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82 results about "Enumerated type" patented technology

In computer programming, an enumerated type (also called enumeration, enum, or factor in the R programming language, and a categorical variable in statistics) is a data type consisting of a set of named values called elements, members, enumeral, or enumerators of the type. The enumerator names are usually identifiers that behave as constants in the language. An enumerated type can be seen as a degenerate tagged union of unit type.

Data query method and device based on natural language and medium

The invention relates to a data query method and device based on a natural language and a medium, and belongs to the technical field of data analysis. Receiving a natural language query input by a user; constructing task planning guide information based on the natural language query, and inputting the task planning guide information into the large language model to identify a target task type corresponding to the natural language query; when the target task type is a data query type task, determining a query target index corresponding to the natural language query from an index library; on the basis of a DSL dimension normal form corresponding to the query target index, dimension fields related to semantics of the natural language query and matched enumeration values are recognized from the multiple dimension fields and enumeration value sets; and constructing a structured intermediate representation, generating an executable code corresponding to the natural language query, and executing the executable code to obtain a corresponding structured query result from a data source. According to the method and the device, the accuracy and the interpretability are considered, and meanwhile, the SQL generation flexibility is improved.
Owner:BEIJING KNOWLEDGE ATLAS TECHNOLOGY CO LTD

Robust record-to-event conversion system

Systems and methods are disclosed comprising techniques for record-to-event conversion, such as retrieving at least one alphanumeric record associated with a monitored digital communication transmitted among two or more users, generating a time-enumerated data structure that stores an event entry set for the monitored digital communication, selectively identifying at least one discrete event for the monitored digital communication, generating one or more relevance scores for the at least one discrete event, identifying at least one valid discrete event from the at least one discrete event, generating an event attribute set for the at least one valid discrete event, updating the normalized event attribute set for a new event entry within the event entry set of the time-enumerated data structure, and transmitting the updated time-enumerated data structure within an elapsed duration after retrieving the at least one alphanumeric record.
Owner:CITIBANK N A

Standard adaptive execution method and equipment based on data standard management

The invention provides a standard adaptive execution method and equipment based on data standard management, and belongs to the technical field of data management. The method comprises the following steps: in response to a standardization request for a service system from a user, generating a corresponding mapping relation library based on a preset root library and a source system field; wherein the mapping relation library at least comprises a mapping relation, established on the basis of a preset semantic matching model, between the source system field and the standard field. And converting each source data value of the business system according to the mapping relation library, and executing real-time verification based on a preset multi-level value domain enumeration constraint before the source data values are written into the target library, so as to intercept conversion abnormal data according to a verification result and generate an abnormal snapshot. And when it is determined that the data standard attribute change event exists or the abnormal snapshots meeting the preset conditions exist, determining a corresponding update strategy type based on the change content of the data standard version change or the root cause classification result of each abnormal snapshot, so as to perform standardized execution according to a corresponding update strategy.
Owner:INSPUR YUNZHOU (SHANDONG) IND INTERNET CO LTD

Prompt word construction method and device

The invention relates to the technical field of data processing, in particular to a cue word construction method and device. In the embodiment of the invention, the electronic equipment determines the keyword contained in the to-be-processed target text and determines the target enumeration value similar to the keyword in the enumeration value corresponding to the target field of the enumeration type to construct the cue word based on the target enumeration value, so that the constructed cue word is accurate, the length of the cue word is shortened, and the user experience is improved. And the efficiency and the accuracy of the text2sql are improved.
Owner:HISENSE GRP HLDG CO LTD

Machine Learning Based Rules Compiler for Part-Of-Speech Tagging

A computer-implemented method for a machine learning based rules compiler, the method comprising receiving machine learning generated ripple down rules, the ripple down rules comprising exception rules for tags in a tag set, the exception rules comprising tag string comparisons. The method further comprises compiling the ripple down rules into optimized computer code. Compiling the rules into computer code further comprises generating an enumeration statement for an enumeration containing the tag set, translating the exception rules for each tag in the tag set into if-else statements for a respective tag, including replacing the tag string comparisons with the enumeration; and generating a switch case statement for a current tag, the switch case statement having cases corresponding the tags in the tag set and including the if-else statements for the respective tag. The optimized computer code comprises the enumeration statement and the switch case statement.
Owner:OPEN TEXT CORP

Stateful protocol fuzzy test method and system based on response information

The invention relates to a stateful protocol fuzzy test method and system based on response information. The method comprises the following steps: S1, a preprocessing stage; S2, a fuzzy test stage; s3, a state selection stage; and S4, a seed scheduling stage. The system comprises a test preparation module, a fuzzy test module, a state selection module and a seed scheduling module. According to the method, the source code of the protocol entity program to be tested is statically analyzed to capture distribution and use of enumeration type variables in the source code. According to the method, the response result information of the tested program is analyzed, the response header field is extracted, on the basis that the response code represents the state, the state is further subdivided, the states represented by a plurality of same state codes in the same seed are effectively distinguished, and the detection accuracy is improved. And the seed value and the variation position are adjusted by using the response header field information reaching the target state and the coverage rate information, so that the code coverage rate of the stateful protocol fuzz test is remarkably improved, more vulnerabilities are found, and the fuzz test efficiency is greatly improved.
Owner:HANGZHOU DIANZI UNIV

Adaptive masking method and system, and device and medium

The present invention relates to the technical field of data security, and in particular to an adaptive masking method and system, and a device and a medium. The method comprises: firstly, acquiring a keyword of a current file to be masked of a sender user; then, on the basis of the keyword, performing addition, deletion and modification on a current sensitive word library to obtain a new sensitive word library; and finally, generating a regular expression on the basis of the new sensitive word library, determining the positions of sensitive words on the basis of the regular expression, so as to obtain the sensitive words, and performing masking to obtain a masked file. Therefore, masking of a plurality of types of data is realized, and data types before and after masking remain unchanged, thereby ensuring the readability of a masked file while guaranteeing the security of masked data, and further increasing the masking speed; on the basis of different roles of receiver and sender users, the masking intensity is adaptively selected, thereby preventing important information from being leaked to untrusted persons, and overcoming the defect of an existing masking algorithm failing to resist collusion attacks and brute-force enumeration attacks; and multiple threads are used to concurrently process sensitive word retrieval and sensitive-word masking operations, thereby greatly increasing the masking speed.
Owner:CHENGDU AIRCRAFT INDUSTRY GROUP

Retrieval enhancement mode linking method and device based on multi-round iteration

The invention provides a retrieval enhancement mode linking method and device based on multi-round iteration, relates to the technical field of natural languages, and can accurately select a first candidate table and a first table element related to input content by combining the input content, key information of the input content, description information of tables in a database, description information of fields and enumeration values. And the accuracy of the first candidate table and the first table element is improved. The first candidate table and the first table element are further screened by utilizing the large language model, so that the semantic comprehension capability of the large language model can be fully utilized, and the accuracy of the second candidate table and the second table element is further improved. Through a table relation directed graph of a database, a retrieval enhancement generation technology is utilized in a multi-round iteration mode, the complex incidence relation between tables is fully considered, the range of a mode link result is gradually expanded, it is ensured that the finally obtained mode link result can completely cover input content, and the recall rate and the accuracy rate of mode link are increased.
Owner:LONGSHINE TECH

Enumeration conversion method and device, electronic equipment and storage medium

The invention provides an enumeration conversion method and device, electronic equipment and a storage medium, and the method comprises the steps: creating a preset enumeration converter when an object relation mapping frame is initialized, and covering an enumeration type converter built in the object relation mapping frame through the preset enumeration converter; in response to the data query instruction, sending a structured query statement to the target database through the object relation mapping framework; receiving a target result set returned by the target database, and when the enumeration type field exists in the target result set, calling a preset enumeration converter to perform value conversion on the enumeration type field; and if it is determined that the enumeration type field cannot be converted to obtain the target enumeration value, returning the preset enumeration value. Compared with the prior art, the fault-tolerant logic of the enumeration converter is preset, and the preset enumeration value is returned when conversion fails, so that the system is prevented from crashing due to an unknown value, and the program stability is improved; by returning the preset value, system failure caused by incompatibility of enumeration values can be avoided.
Owner:JINAN INSPUR DATA TECH CO LTD

Data processing method and related equipment

PendingCN121052246ASemantic analysisHard codingWord identification
The invention provides a data processing method and related equipment. The data processing equipment firstly obtains a first security word in a to-be-processed code text and a non-hard-coded code text set; and the data processing device filters the to-be-processed code text based on the first security word. And the data processing equipment identifies non-security words in the filtered code text to be processed. According to the method, the removal of the security text can be assisted in a mode of simplifying the code text through the security word, that is, the to-be-processed code text is simplified from the perspective of the security text, sensitive information in the code text is not changed, and missed judgment can be reduced. And the enumeration difficulty caused by non-security word recognition by using the keywords of the non-security words in the prior art can be reduced.
Owner:HUAWEI TECH CO LTD

Robust record-to-event conversion system

Systems and methods are disclosed comprising techniques for record-to-event conversion, such as retrieving at least one alphanumeric record associated with a monitored digital communication transmitted among two or more users, generating a time-enumerated data structure that stores an event entry set for the monitored digital communication, selectively identifying at least one discrete event for the monitored digital communication, generating one or more relevance scores for the at least one discrete event, identifying at least one valid discrete event from the at least one discrete event, generating an event attribute set for the at least one valid discrete event, updating the normalized event attribute set for a new event entry within the event entry set of the time-enumerated data structure, and transmitting the updated time-enumerated data structure within an elapsed duration after retrieving the at least one alphanumeric record.
Owner:CITIBANK N A

Processing strategy loading execution system and method based on Spring framework

The invention discloses a processing strategy loading execution system and method based on a Spring framework, and relates to the technical field of software development, and the system comprises a component enumeration class, a strategy interface, a strategy template class, a basic factory class, the Spring framework and a component factory class. According to the method, the dependency injection mechanism of the Spring framework is combined with the policy mode formed by the policy interface, the basic factory class, the policy template class, the component enumeration class and the component factory class, so that independent management of different policies is realized, the coupling degree is reduced, codes do not need to be changed when the policies are newly added, and the expansibility is improved; an abstract template of the strategy is provided through the strategy template class, so that the code maintainability is improved; by introducing a cache mechanism into the basic factory class, the strategy instance is prevented from being searched repeatedly, and the system operation efficiency is improved.
Owner:ELLIPSPACE (BEIJING) TECH CO LTD

A method and system for analyzing and calculating compression parameters of an LZ77 compression algorithm

The application provides a compression parameter analysis calculation method and system of an LZ77 compression algorithm, comprising judging whether an LZ77 code of compressed data stream adopts a flag bit method or an escape code method; for the flag bit method, using obtained flag bit B, bit number D of distance code and bit number L of length code to decompress data stream S to obtain compressed data stream Q, and determining that the bit number of distance code is L; for the escape code method, analyzing distance code with distance K and extension code; in response to K>L, generating special compressible data with distance 1-4 to inject an LZ77 compressor to obtain compressed data, and calculating distance escape code and extension code with distance 1-4. The method calculates LZ77 compression parameters according to enumeration, so as to realize data decompression, solve the problem of decompression of a black box compressor, and has great innovation and practical significance in the application of data analysis.
Owner:XIAMEN MEIYA PICO INFORMATION CO LTD

Dynamic maximal clique enumeration device and method based on FPGA with HBM

Disclosed in the present invention are a dynamic maximal clique enumeration device and method based on an FPGA with an HBM, the method including: the HBM stores a dynamic edge flow, a complete graph adjacency matrix, and candidate cliques; a matrix computing unit updates the complete graph adjacency matrix based on the dynamic edge flow, transmits the updated complete graph adjacency matrix to the HBM for storage, and determines header nodes, of which the corresponding candidate clique needs to be updated; a sequence computing unit constructs, according to the updated complete graph adjacency matrix and each header node to be updated, the sorted data set for reconstructing candidate cliques by data block sequencing; and an update computing unit executes, in parallel, an update task of the candidate clique corresponding to each header node to be updated based on the sorted data set, transmits the updated candidate cliques to the HBM for storage, and transmits the updated candidate cliques to the PC host to extract maximal cliques by means of a filtering operation. The present invention supports the computation of pipelined-type incremental maximal clique, thereby improving the overall computing efficiency of the task.
Owner:ZHEJIANG LAB

An efficient learning-based index construction method and system for accelerating queries in read-only scenarios

The application discloses a high-efficiency learning index construction method and system for accelerating query in a read-only scenario. The method first assumes that a distributed simplified model construction strategy processes a data set, divides data keys into groups of k, takes the first key of each group as a representative key, trains by using a PLA algorithm, and calculates an upper limit of a segment number; then a two-dimensional dynamic programming array is defined; the PLA algorithm is used to fit from the first representative key, and if successful, initialization cost information and space size are obtained, and if failed, a distributed remapping model strategy is used; then from the initial segment number to the upper limit, the outer layer enumerates the segment number, the inner layer enumerates the segment point, the minimum space cost is calculated and updated, and the result is saved; finally, the model information is taken from the rear to the front according to the calculated segment number, and the optimal segmentation strategy is obtained by integration. The application effectively constrains the error of the read-only learning index, reduces the query time of the index, and has the advantages of small index space occupation, low index height and small prediction error.
Owner:NANJING UNIV

Data processing method, device, electronic device and storage medium

The embodiment of the present invention discloses a data processing method, device, electronic device and storage medium. The method includes: obtaining raw data of an enumerated data type; determining first identification data according to the raw data; the raw data is uniquely associated with the first identification data; if it is determined that the number of raw data and the number of bits of the first identification data meet the preset constraint condition, the raw data is converted into second identification data according to the preset conversion rule; the raw data is uniquely associated with the second identification data, and the number of raw data matches the number of bits of the second identification data. By executing the technical solution provided by the embodiment of the present invention, it is possible to save the computing and storage space of the computer and improve the computing efficiency and retrieval efficiency.
Owner:RUN TECH CO LTD BEIJING

Large language model driven ODS layer full-process data resource evaluation modeling system, method and device, storage medium and program product

The invention relates to the technical field of database information management, discloses a big language model driven ODS layer full-process data resource evaluation modeling system, method and device, a storage medium and a program product, and is used for solving the technical problems of low modeling efficiency and poor effect in the prior art. Comprising a data input module used for capturing a table structure and table metadata of a newly-added business table corresponding to a target iteration version in real time; the modeling evaluation module is used for calling a large language model to fuse historical evaluation records and resource classification rules, evaluating data resources contained in the newly-added service table and outputting a resource classification result and a modeling evaluation conclusion; the data modeling module is used for calling a large language model to generate field description for each field contained in the newly added business table when modeling needs to be executed, and analyzing business source codes related to enumeration fields to generate field description of the enumeration fields when the fields are enumeration fields; and based on the table structure, the table metadata and the field description, generating a data resource model on the ODS layer.
Owner:SHANGHAI QIYU INFORMATION TECH CO LTD

Stateful protocol fuzz testing method and system based on uncovered edge

The invention relates to a stateful protocol fuzzy test method based on an uncovered edge. The method comprises the following steps: S1, program preprocessing; s2, performing fuzzy testing on the seeds; s3, state selection; and S4, seed scheduling. The system comprises a test preparation module, a fuzzy test module, a state selection module and a seed scheduling module. According to the method, the source code of the protocol entity program to be tested is statically analyzed to capture distribution and use of enumeration type variables in the source code. According to the method, potential benefits of a seed in different fuzzy states are evaluated by analyzing code block information which is not explored by a fuzzifier on a program control flow chart, and state information triggered by the seed is analyzed, so that the fuzzifier selects a state and a seed which are easier to cover a new program branch; and the overall vulnerability detection efficiency of the fuzzy test system is maximized.
Owner:HANGZHOU DIANZI UNIV

Code automatic generation method, device, equipment, medium and program product

The present disclosure provides a code automatic generation method, which can be applied to the field of artificial intelligence or other technical fields. The method comprises: in response to a request of a target user for initiating code generation, obtaining configuration parameters input by the target user; loading a pre-configured strategy component template, and generating an enumeration class and a strategy interface according to the configuration parameters and the strategy component template; generating at least one strategy implementation class by using the strategy component template based on enumeration values of the enumeration class, wherein the strategy implementation class is used to implement the strategy interface; and integrating the enumeration class, the strategy interface and the strategy implementation class to form a strategy mode code set. The present disclosure also provides a code automatic generation device, equipment, storage medium and program product.
Owner:CHINA CONSTRUCTION BANK +1

Method, system and equipment for generating error view of application program and medium

The invention relates to the technical field of computer software, in particular to a method for generating an error view of an application program, electronic equipment and a storage medium. The method comprises the steps that an enumeration class is created, the enumeration class comprises a plurality of enumeration values, and an enumeration error type corresponding to each enumeration value is defined; defining an empty state view class, wherein configuration parameters of enumeration error types are packaged in the empty state view class; calling and executing a binding function to receive an error parameter, judging whether an enumeration value consistent with the error parameter exists or not, if so, judging that a current error type corresponding to the error parameter belongs to an enumeration error type, loading a corresponding configuration parameter from an empty state view class according to the current error type, and obtaining an empty state view root layout; a null-state view is generated based on the null-state view root layout and added to an interface for display to a user. The development efficiency can be effectively improved, and the development cost can be effectively reduced.
Owner:SHENZHEN GREEN CONNECTION TECH CO LTD

Metadata knowledge collection method, data processing method, device and equipment

The invention discloses a metadata knowledge collection method, a data processing method, devices and equipment. The method comprises the following steps: inputting a historical structured query language (SQL) statement in a first input box of a first interface; in response to an input operation on the first input box, a historical SQL statement is received and analyzed, key information used for representing metadata knowledge is obtained, the key information can comprise a field and value information of the field, and the value information of the field is a data value of the field. According to the method and the device, the historical SQL statements can be touched in many scenes, so that the historical SQL statements are easy to obtain. Therefore, the metadata knowledge, namely the fields and the value information of the fields, is obtained by analyzing the historical SQL statements. Metadata knowledge can contain enumeration values and semantics thereof, subsequent operations such as data processing (such as data query) can be carried out in combination with the metadata knowledge, user underlying business data does not need to be contacted, the security is relatively high, the calculated amount is relatively small, and the accuracy of data query is improved.
Owner:HUAWEI CLOUD COMPUTING TECHNOLOGIES CO LTD

Systems and methods for automated code generation for calculation based on associated formal specifications

Enterprise software relies on numerous types and instances of mathematical and logical calculations for proper functioning, which are formally specified in spreadsheets, known as Calculation Specification (CS) sheets, that provide illustrations of the inputs and outputs of the calculation, and are expressed in inputs and formulae applied on them to get values for outputs. The values for such inputs are retrieved by executing ad hoc queries on respective application's database. Present disclosure provides systems / methods to synthesize code using CS sheets by formulating a Programming By Example (PBE) problem for each input involved in the calculation. A query synthesis technique is then implemented that uses natural language processing and enumerative program synthesis techniques to infer queries corresponding to the PBE problem. These queries are filtered based on whether their output is consistent with expected output in PBE. Finally, the synthesized queries and calculation formulae are translated into a desired target programming language.
Owner:TATA CONSULTANCY SERVICES LTD

Data analysis method and device, electronic equipment and storage medium

The application provides a data analysis method and device, electronic equipment and storage medium; the method comprises the following steps: for each obtained string, calling a preset first enumeration class to analyze all instructions in the string; calling a preset second enumeration class to analyze all data codes in the string; performing syntax analysis on the string to determine the execution logic between each instruction and each data code; determining the data source pointed to by the data code according to the field in the data code, and determining the data structure of the data source; and enabling each instruction to call the data code according to the execution logic, loading data according to the data structure pointed to by the data code, and obtaining target data. Therefore, the target data can be loaded across data sources and data types.
Owner:BOE TECHNOLOGY GROUP CO LTD

A Temporal Constraint-Based Big Data Association Rule Mining Method

The present invention relates to the technical field of big data mining, and discloses a method for mining big data association rules with time series constraints, including: S1: Processing the data stream to be mined by using a time sliding window to form a database; S2: Scanning the database, calculating the value of each element in the database, deleting the elements with a value less than a predetermined value, and sorting the remaining elements according to the value size; S3: Scanning the database again, adjusting the order of the elements in the database, and the order of the elements after adjustment is the sorting order of the elements based on the value size; S4: Constructing an initial element value list, and constructing a K-set value list in an iterative manner; S5: Constructing a set enumeration tree, pruning the set enumeration tree by using a value strategy method, and the finally enumerated set of element sequences is the association rule of the database.
Owner:HUNAN FENGHUI YINJIA SCI & TECH CO LTD

Optimizing computer code using serialized data structures

Example embodiments facilitate efficient comparison operations of tree structures, resulting in comparison metrics (e.g., similarity or distance metrics or scores) used enhance software systems, such as search algorithms, code optimization software, enterprise database applications, and so on. Trees to be compared are converted into sets, i.e., serialized using a novel enumeration method. Metric functions can then be efficiently applied to the sets to facilitate the comparison operations. In an illustrative embodiment, subtrees of larger trees can be compared individually, pairwise, where the comparison results of the subtree comparisons can be selectively weighted and summed to yield an aggregated comparison metric that is tailored for a specific application or comparison priority.
Owner:ORACLE INT CORP

Space- and time-efficient enumerations

Systems, computer instructions and computer-implemented methods are disclosed for implementing space- and time-efficient enumerations. An instance of an enumeration class may be created with a constant, plurality of enumerations. A plurality of objects corresponding to the respective enumerations may be stored in memory along with a lookup table indexed by respective ordinal values of the plurality of enumerations, the lookup table including respective references to the stored objects of the instantiated enumeration class. A reference to an enumeration may be stored in a memory location by storing an ordinal value of the enumeration. A determination may then be made to convert a stored ordinal value to a reference to an object, and responsive to the determination, the ordinal value may be loaded and used as an index into the lookup table to obtain the reference to the object corresponding to the enumeration.
Owner:ORACLE INT CORP

Method for improving readability of register model modeling code, storage medium

The present invention discloses a method and a storage medium for improving the readability of register model modeling code. A method for improving the readability of register model modeling code includes the following steps: creating a UVM register model, deriving from the field base class of the UVM register model to generate a subclass; expanding or adding a series of interface methods in the subclass to support method calls of enumerated type values; creating an enumerated type variable corresponding to the register field of the preset UVM register model; using the subclass to replace the field base class to reconstruct the example register; and using the interface method of the subclass to perform read and write access to the register field. The present invention can improve the coding method for the readability of register fields, avoid repeatedly referring to the design documents, save time for design and verification developers, and improve their work efficiency.
Owner:YUNHE ZHIWANG (SHANGHAI) TECHNOLOGY CO LTD

Automated least privilege assignment

Described are techniques for automated least privilege role definition. The techniques include enumerating access patterns including a subject, a verb, an object location, and an object type of respective Application Programming Interface (API) calls in source code associated with a binary program. For a first function call in the source code, the technique is configured to generate a first object type based on an API definition associated with the function call, a first verb based on an API-to-verb matching database, a first subject based on a program-to-subject mapping database and the binary program, and a first object location based on the API definition associated with the function call. The technique further includes generating a Role Based Access Control (RBAC) role definition based on the enumerated access patterns.
Owner:INTERNATIONAL BUSINESS MACHINE CORPORATION

Standardization method, device and computer equipment for nuclear power business data

The application relates to a nuclear power service data standardization method, device and computer equipment. The method comprises the following steps: determining data elements used by different service domains; sequentially performing deduplication and merging processing on the data elements of different service domains to obtain target data elements; constructing a data dictionary according to the target data elements, and configuring identification type attributes, representation type attributes and description type attributes of the target data elements in the data dictionary; for the target data elements with value domains that can be enumerated in the representation type attributes, summarizing the values of the target data elements to obtain a summary result, and generating a code set according to the summary result; and standardizing the nuclear power service data to be standardized according to the data dictionary and / or the code set. The method can effectively improve the standardization processing efficiency of data.
Owner:CHINA NUCLEAR POWER ENGINEERING COMPANY LTD +2

Longitudinal federated learning-oriented data value evaluation method and device

The invention discloses a longitudinal federated learning-oriented data value evaluation method and apparatus, belongs to the technical field of data processing, and solves the technical problems of difficult data value quantification, high privacy disclosure risk and possible return of false results by a third-party server in longitudinal federated learning. According to the method, an intersection cardinal number calculation task list is constructed by enumerating eigenvalue combinations of all parties; deriving a random number of subtasks for the task and assigning randomization parameters; synchronously distributing task information to a data provider; when executing the subtask, generating an encrypted pseudo sample and an adversarial sample and sending to a third party; performing complete unless non-negative and consistency triple verification on a returned result; and aggregating subtask results passing verification to calculate a data value. The method is mainly used for safely and efficiently quantifying the contribution value of each data party in the longitudinal federated learning on the premise of protecting the privacy of the original data, and promoting the marketization circulation of data elements.
Owner:BEIHANG UNIV