CN116204770A - Training method and device for detecting abnormality of bridge health monitoring data - Google Patents
Training method and device for detecting abnormality of bridge health monitoring data Download PDFInfo
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Abstract
The invention provides a training method and a training device for detecting abnormality of bridge health monitoring data, wherein the method comprises the following steps: acquiring time sequence monitoring data sample sets of multiple categories in different fields and multiple teacher networks to be trained, inputting the time sequence monitoring data sample sets into each corresponding teacher network to be trained according to the categories, and training until convergence is completed to complete the training of the teacher network; acquiring a bridge health monitoring data sample set and a student network to be trained, respectively inputting a plurality of trained teacher networks and the student network to be trained, and performing knowledge distillation training on the student network to be trained by utilizing the plurality of trained teacher networks until convergence is achieved to complete the training of the student network; and carrying out abnormal prediction on the bridge health monitoring data to be detected by using the trained student network. The method solves the problem that the existing neural network model cannot detect the abnormality of the target bridge health monitoring data because the bridge monitoring abnormal data set in the prior art has no label and the normal sample is insufficient.
Description
Technical Field
The invention belongs to the technical field of bridge monitoring, and particularly relates to a training method and device for detecting abnormality of bridge health monitoring data.
Background
At present, methods for detecting anomalies of various types of bridge monitoring data are generally divided into two main types, namely a traditional model-driven time sequence anomaly detection method, including a statistical-based method, a reconstruction-based method and a clustering-class classification-based method; the second is a data-driven time sequence anomaly detection method based on Deep learning, which mainly comprises Deep classification, deep one-class, autoencoder and other models.
The traditional time sequence anomaly detection method mostly depends on expert knowledge and a manually designed feature extractor, and can not utilize a mass sensor to monitor data mining useful information, so that the method is inferior to the time sequence anomaly detection method based on deep learning in the aspects of model expandability, anomaly judgment accuracy, stability and the like.
At present, the deep learning technology is widely applied and verified in various fields, and the application of the deep learning technology to the abnormal detection of bridge health monitoring data faces two main problems: firstly, on the data layer, training of a depth model depends on a large amount of labeled data, but the existing bridge monitoring abnormal data set with completed labeling is lacking, for bridge monitoring, abnormal data examples are very rare and only occupy a small part of normal examples, and training of a depth model for bridge abnormality detection is very difficult due to the situations; secondly, on the model level, the existing depth model is often provided with a plurality of parameters, is complex in structure and low in running speed, and cannot meet the real-time requirement of bridge abnormality detection in practical application.
Disclosure of Invention
The invention provides a training method and device for detecting bridge health monitoring data anomalies, and aims to solve the problem that an existing neural network model cannot detect target bridge health monitoring data anomalies due to the lack of marked bridge monitoring anomaly data sets in the prior art.
The invention provides a training method for detecting abnormality of bridge health monitoring data, which comprises the following steps:
acquiring time sequence monitoring data sample sets of multiple categories in different fields and multiple teacher networks to be trained, inputting the time sequence monitoring data sample sets into each corresponding teacher network to be trained according to the categories, training until convergence, and acquiring multiple trained teacher networks;
acquiring a bridge health monitoring data sample set and a student network to be trained, respectively inputting the bridge health monitoring data sample set into the trained multiple teacher networks and the student network to be trained, and performing knowledge distillation training on the student network to be trained by utilizing the trained multiple teacher networks until convergence to obtain the trained student network;
the trained student network is used for predicting the bridge health monitoring data to be detected so as to obtain a prediction result of whether the bridge health monitoring data to be detected is abnormal or not.
According to the training method for detecting the abnormality of the bridge health monitoring data provided by the invention, each teacher network comprises a first encoder and a first decoder;
correspondingly, inputting the time sequence monitoring data sample set into each corresponding teacher network to be trained according to the category to train until convergence, and specifically comprising the following steps:
dividing the time series monitoring data sample set into a first sample segment sequence according to time series;
inputting the first sequence of sample segments into the first encoder;
the first encoder extracts a first concealment state for the first sequence of sample segments;
the first decoder outputs a first reconstructed sample sequence according to the first concealment state;
bringing the first reconstructed sample sequence and the first sample fragment sequence into a first loss function, and completing training when the first loss function converges;
repeating the steps until the plurality of teacher networks to be trained complete training.
According to the training method for detecting the abnormality of the bridge health monitoring data provided by the invention, after the teacher network to be trained finishes training, the training method further comprises the step of carrying out abnormality prediction on the monitoring data in the respective fields by utilizing the teacher network, and specifically comprises the following steps:
acquiring a monitoring data segment to be detected;
inputting the monitoring data segment to be detected into the corresponding teacher network to obtain a first prediction result;
calculating a first anomaly score value based on the monitored data segment to be detected and the first prediction result;
and judging the first anomaly score value according to a preset first threshold value and outputting an anomaly prediction result corresponding to the field monitoring data.
According to the training method for detecting the abnormality of the bridge health monitoring data provided by the invention, the bridge health monitoring data sample set is respectively input into the trained multiple teacher networks and the student network to be trained, and knowledge distillation training is carried out on the student network to be trained by utilizing the trained multiple teacher networks until convergence, and the training method specifically comprises the following steps:
dividing the bridge health monitoring data sample set into a second sample fragment sequence according to time sequence;
inputting the second sample fragment sequence into the student network to be trained to obtain a second reconstructed sample sequence output by the student network;
inputting the second sample fragment sequence into the trained multiple teacher networks to obtain a third reconstructed sample sequence output by each teacher network;
and calculating distillation loss according to the second sample fragment sequence, the second reconstructed sample sequence and the third reconstructed sample sequence output by each teacher network, and guiding the student network training by adopting a counter-propagation gradient descent method.
According to the training method for bridge health monitoring data anomaly detection provided by the invention, distillation loss is calculated according to the second sample fragment sequence, the second reconstructed sample sequence and the third reconstructed sample sequence output by each teacher network, and a counter-propagation gradient descent method is adopted to guide student network training, which comprises the following steps:
calculating a first reconstructed sample error value for the student network based on the second sample fragment sequence and the second reconstructed sample sequence;
calculating a reconstructed sample error value of each teacher network based on the second sample fragment sequence and the third reconstructed sample sequence output by each teacher network, and accumulating to form a second reconstructed sample error value;
calculating a reconstructed sample error value between each teacher network and each student network based on the second reconstructed sample sequence and the third reconstructed sample sequence output by each teacher network, and accumulating to form a third reconstructed sample error value;
and adding the first reconstructed sample error value, the second reconstructed sample error value and the third reconstructed sample error value to obtain an overall error value, and iteratively optimizing the network parameters of the student network until convergence by taking the overall error value as distillation loss to obtain the student network with training completed.
According to the training method for detecting the abnormality of the bridge health monitoring data, the student network comprises a second encoder and a second decoder;
correspondingly, the second sample fragment sequence is input into the student network to be trained to obtain a second reconstructed sample sequence output by the student network, and the method specifically comprises the following steps:
inputting the second sequence of sample fragments into the second encoder;
the second encoder extracts a second concealment state for the second sequence of sample segments;
the second decoder outputs the second reconstructed sample sequence according to the second concealment state.
According to the training method for detecting the abnormality of the bridge health monitoring data provided by the invention, the trained student network is used for predicting the bridge health monitoring data to be detected so as to obtain a prediction result of whether the bridge health monitoring data to be detected is abnormal, and the training method specifically comprises the following steps:
acquiring bridge health monitoring data segments to be detected;
inputting the bridge health monitoring data segment to be detected into the student network to obtain a second prediction result;
calculating a second abnormal score value based on the bridge health monitoring data segment to be detected and the second prediction result;
and judging the second abnormal score value according to a preset second threshold value and outputting an abnormal prediction result of the bridge health monitoring data.
The invention also provides a training device for detecting the abnormality of the bridge health monitoring data, which comprises:
the teacher network training module is used for acquiring time sequence monitoring data sample sets of a plurality of categories in different fields and a plurality of teacher networks to be trained, inputting the time sequence monitoring data sample sets into each corresponding teacher network to be trained according to the categories, training until convergence, and acquiring a plurality of trained teacher networks;
the student network training module is used for acquiring a bridge health monitoring data sample set and a student network to be trained, inputting the bridge health monitoring data sample set into the trained multiple teacher networks and the student network to be trained respectively, and performing knowledge distillation training on the student network to be trained by utilizing the trained multiple teacher networks until convergence to obtain the trained student network;
the trained student network is used for predicting the bridge health monitoring data to be detected so as to obtain a prediction result of whether the bridge health monitoring data to be detected is abnormal or not.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the training method for detecting the abnormality of the bridge health monitoring data is realized by the processor when the processor executes the program.
The invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a training method for bridge health monitoring data anomaly detection as described in any one of the above.
On one hand, for the problem that the existing neural network model cannot perform abnormal detection on target bridge health monitoring data due to the fact that no label exists on a data layer and a positive sample is insufficient, the invention introduces the idea of transfer learning, trains a plurality of teacher networks on the basis of acquiring a disclosed time sequence monitoring data sample set in other fields, acquires abundant abnormal modes, and transfers learned knowledge to an abnormal detection task of the target bridge health monitoring data; on the other hand, for a time sequence monitoring data set, the model level has the problem of operation real-time, the invention adopts the idea of knowledge distillation, and trains a target student network for bridge health monitoring data anomaly detection through a plurality of teacher networks, wherein the teacher network has a complex structure and more parameters, but can better learn a complex time sequence anomaly change mode, and the student network has a simple structure, fewer parameters and high operation speed, and can fully learn the time sequence anomaly feature mining capability of the teacher network so as to meet the real-time requirement of performance and operation speed in actual deployment. Therefore, the method and the system can fully mine the abnormal mode and the time sequence abnormal change mode in the mass monitoring data, accurately judge the occurrence of abnormal conditions, have instantaneity and can be well applied to daily maintenance management of bridges.
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In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a training method for detecting anomalies in bridge health monitoring data according to the present invention;
fig. 2 is a schematic diagram of training a teacher network in the training method for detecting abnormality of bridge health monitoring data according to the present invention;
FIG. 3 is a schematic diagram of knowledge distillation training of a student network to be trained by using a plurality of trained teacher networks in the training method for detecting abnormality of bridge health monitoring data provided by the invention;
fig. 4a is a schematic diagram of a network structure of a teacher network encoder and decoder in a training method for detecting anomalies in bridge health monitoring data according to the present invention;
fig. 4b is a schematic diagram of a network structure of a student network encoder and decoder in a training method for detecting anomalies in bridge health monitoring data according to the present invention;
fig. 5 is a schematic structural diagram of a training device for detecting abnormality of bridge health monitoring data according to the present invention;
fig. 6 is a schematic structural diagram of an electronic device provided by the present invention.
Reference numerals:
21: a teacher network training module; 22: and the student network training module.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Knowledge distillation (Knowledge distillation, KD), which can transfer knowledge of one or more networks to another homogeneous or heterogeneous network, is widely used in transfer learning and model compression. Knowledge distillation requires training one or more teacher networks first and then training student networks using the output of these teacher networks and the true labels of the data. Knowledge distillation can be used to transform the network from a large teacher network to a small student network, implementing compression of the model and preserving performance close to that of the large network; knowledge of multiple teacher networks may also be transferred to one student network so that the performance of a single network approaches the results of an emsemble.
The core idea of the transfer learning is to maximally utilize the knowledge of the marked domain to assist the knowledge acquisition and learning of the target domain. And (5) finding out the similarity between the source field and the target field and reasonably utilizing the similarity. Such similarity is very common, e.g. the body construction of different people is similar; the riding patterns of bicycles and motorcycles are similar; chess and Chinese chess are similar; the playing modes of shuttlecocks and tennis balls are similar. This similarity can also be understood as invariant. With this similarity, the next step is how to measure and exploit this similarity. The goal of the metrology work is two-fold: firstly, the similarity of two fields is well measured, and not only is the similarity of two fields qualitatively taught to us, but also the similarity degree is given more quantitatively. Secondly, the measurement is taken as a criterion, and the similarity between the two fields is increased by a learning means to be adopted, so that the transfer learning is completed.
Referring to fig. 1, a training method for detecting anomalies in bridge health monitoring data provided in this embodiment includes:
step S1: acquiring time sequence monitoring data sample sets of multiple categories in different fields and multiple teacher networks to be trained, inputting the time sequence monitoring data sample sets into each corresponding teacher network to be trained according to the categories, training until convergence, and acquiring multiple trained teacher networks;
in this step, obtainOther different fields and categories of published time series monitoring data sample sets
Training corresponding Teacher networks Teacher on these data sets 1 ,…,Teacher K As shown in fig. 2. After training is completed, each teacher network is saved for subsequent training of student networks.
Step S2: the method comprises the steps of obtaining a bridge health monitoring data sample set and a student network to be trained, respectively inputting the bridge health monitoring data sample set into a plurality of trained teacher networks and the student network to be trained, and performing knowledge distillation training on the student network to be trained by utilizing the plurality of trained teacher networks until convergence to obtain the trained student network;
in this step, a knowledge distillation method is adopted on a target data set, i.e. a bridge health monitoring data sample set, and a Student network Student is trained by using K teacher networks after training, as shown in fig. 3.
According to the training method for detecting the abnormality of the bridge health monitoring data, the plurality of teacher networks are trained by acquiring the time sequence monitoring data sample sets of the plurality of categories in different fields, and the training of the teacher networks is completed; and respectively inputting the bridge health monitoring data sample set into a plurality of trained teacher networks and a plurality of student networks to be trained by acquiring the bridge health monitoring data sample set and the student networks to be trained, and carrying out knowledge distillation training on the student networks to be trained by utilizing the plurality of trained teacher networks until convergence to obtain the trained student networks. And performing anomaly detection on the bridge health monitoring data to be detected by using the trained student network, namely inputting the bridge health monitoring data to be detected into the student network, performing anomaly prediction on the student network, and outputting 0 (no anomaly on the representative monitoring data) or 1 (anomaly on the representative monitoring data). On one hand, for the problem that the existing neural network model cannot detect the abnormality of the target bridge health monitoring data due to the fact that no label exists on the data layer and the positive sample is insufficient, the idea of migration learning is introduced, a plurality of teacher networks are trained on the basis of acquiring a disclosed time sequence monitoring data sample set in other fields, rich abnormality modes are obtained, and learned knowledge is migrated to a target bridge health monitoring data abnormality detection task; on the other hand, for a time sequence monitoring data set, the model level has the problem of operation real-time, the invention adopts the idea of knowledge distillation, and trains a target student network for bridge health monitoring data anomaly detection through a plurality of teacher networks, wherein the teacher network has a complex structure and more parameters, but can better learn a complex time sequence anomaly change mode, and the student network has a simple structure, fewer parameters and high operation speed, can fully learn the time sequence anomaly feature mining capability of the teacher network, and meets the real-time requirements of performance and operation speed in actual deployment. Therefore, the neural network model obtained by training can fully mine abnormal modes and time sequence abnormal change modes in mass monitoring data, accurately judge abnormal conditions, has instantaneity and can be well applied to daily maintenance management of bridges.
In this embodiment, obtaining a set of published time series monitoring data samples of different categories in different fields includes: the number of teacher networks K in this embodiment is set to 3, and the SMD data set, the PSM data set, and the SWaT data set are server operation monitoring data sets. These datasets were divided in time series into sequences of segments of dimension 24 x 3, where dimension 24 represents the length of the input monitoring time series being 24 and dimension 3 represents the monitoring of 3 indices per instant. For encoders of teacher and student networks, the input dimension is 24×3, the output dimension is 24×64, for decoders, the input dimension is 24×64, the output dimension is 24×3, and the hidden layer dimension of the depth network is set to 64.
Teacher of each Teacher's network K Comprising a first Encoder Encoder K And a first Decoder K ；
Correspondingly, inputting the time sequence monitoring data sample set into each corresponding teacher network to be trained according to the category to train until convergence, and specifically comprising the following steps:
sample set of time series monitoring data
Dividing into a first sample segment sequence X in time series t ；
Sequence of first sample segments X t Input to a first Encoder Encoder K ；
First Encoder Encoder K Extracting a first sample fragment sequence X t Is the first hidden state Z of (1) t ；
First Decoder K Outputting a first reconstructed sample sequence according to a first concealment state
First reconstructing the sample sequence
With the first sample fragment sequence->
Bringing a first loss function, and completing training when the first loss function converges;
repeating the steps until a plurality of Teacher networks Teacher to be trained 1 ，...，Teacher K And (5) training is completed.
In this embodiment, after training is completed by the teacher network to be trained, the method further includes performing anomaly prediction on the monitoring data in the respective fields by using the teacher network, and specifically includes:
acquiring a monitoring data segment X to be detected k ；
The monitoring data segment X to be detected k Inputting corresponding Teacher network Teacher K To obtain a first prediction result Teacher K (X k )；
Based on the monitored data segment X to be detected k And a first predictor Teacher K (X k ) Calculate the firstAnomaly score value
According to a preset first threshold sigma, the first anomaly score value
And judging and outputting an abnormal prediction result of the corresponding field monitoring data.
Specifically, because the bridge health monitoring data set does not have any labeling information, an unsupervised training mode is needed. The present embodiment designs a depth anomaly detection network based on a self encoder (Autoencoder). A self-encoder network for reconstructing normal instances is first trained, and then the trained network is used in combination with a set first threshold value to detect whether an abnormality exists in a certain monitored data segment. As shown in fig. 2, a set of data samples is monitored for a time series
On top of that, divided into a first sample segment sequence X in time sequence t Teacher's network for Teacher K Encoder Encoder K Receiving a first sample fragment sequence X t As input, the intermediate first hidden state Z is derived by equation (1) t Then Decoder K To put the first hidden state Z t As input, the first reconstructed sample sequence is output by equation (2)>
Z t ＝Encoder K (X t )； (1)
Equation (3) characterizes the first loss function
Loss value of (i.e. first sample fragment sequence X) t And the first reconstructed sample sequence->
Is the norm L2 distance of (2):
based on a first loss function
And (3) carrying out iterative optimization updating on the network parameters of the teacher network by adopting an ADAM algorithm so as to complete training.
Teacher network Teacher after training K The method is used for predicting the abnormality of the monitoring data in the corresponding field, and comprises the following steps:
the monitoring data segment X to be detected k Teacher network Teacher for inputting corresponding field K To obtain a Teacher network Teacher K The output first prediction result Teacher K (X k ) Calculating a first anomaly score value of the monitored data segment X to be detected through a formula (4)
Judging the first abnormal score value through a formula (5) to obtain an abnormal prediction result y1 of the corresponding field monitoring data, and adopting a binary classification method to judge the first abnormal score value
Classification predictionI.e. judge if
Then it indicates that the corresponding domain monitoring data is abnormal (y1=0), otherwise it indicates that the corresponding domain monitoring data is abnormal (y1=1), where σ is a first threshold value defined by user.
In this embodiment, the input bridge health data sample set is also divided into segment sequences with dimensions of 24×3 according to time sequence, wherein dimension 24 represents the length of the input monitoring time sequence being 24, and dimension 3 represents 3 indexes monitored at each moment, namely, ambient temperature, girder displacement and component fatigue. Referring to fig. 3, a bridge health monitoring data sample set is respectively input into a plurality of trained teacher networks and a student network to be trained, and knowledge distillation training is performed on the student network to be trained by using the plurality of trained teacher networks until convergence, which specifically includes:
sample set of bridge health monitoring data
Time-series division into a second sequence of sample fragments X b ；
Sequence of second sample fragments X S Inputting the Student network Student to be trained to obtain a second reconstructed sample sequence output by the Student network Student
Sequence of second sample fragments X S Inputting trained multiple Teacher networks Teacher 1 ，...，Teacher K Obtaining each Teacher network Teacher K Output third reconstructed sample sequence
According to the second sample fragment sequence X S A second reconstructed sample sequence
And a third reconstructed sample sequence per teacher network output +.>
The distillation loss is calculated, and a counter-propagation gradient descent method is adopted to guide the student to train on the network.
In this embodiment, according to the second sample fragment sequence X S A second reconstructed sample sequence
And a third reconstructed sample sequence per teacher network output +.>
Calculating distillation loss, and guiding student network training by adopting a counter-propagation gradient descent method, wherein the method specifically comprises the following steps of:
based on the second sample fragment sequence X S And a second reconstructed sample sequence
Calculating a first reconstructed sample error value +.>
See formula (6):
based on the second sample fragment sequence X S And a third reconstructed sample sequence output by each teacher network
Calculating the reconstructed sample error value of each teacher network, and accumulating to form a second reconstructed sample error value +.>
See formula (7):
based on the second reconstructed sample sequence
And a third reconstructed sample sequence per teacher network output +.>
Calculating the error value of the reconstructed sample between each teacher network and each student network, and accumulating to form a third reconstructed sample error value +.>
See formula (8):
error value of first reconstructed sample
Second reconstructed sample error value +.>
And a third reconstructed sample error value +.>
Adding to obtain an overall error value->
See formula (9):
the total error value is reduced by adopting a counter-propagation gradient descent method through a formula (10)
And carrying out iterative optimization on the network parameters of the student network as distillation loss until convergence to obtain the training-completed student network.
Wherein θ is a network parameter of the student network.
Specifically, the backward propagation gradient descent method adopts an ADAM algorithm to update and optimize the network parameters of the Student network Student.
In this embodiment, the Student network Student includes a second Encoder and a second Decoder;
correspondingly, the second sample fragment sequence X S Inputting the Student network Student to be trained to obtain a second reconstructed sample sequence output by the Student network Student
The method specifically comprises the following steps:
sequence of second sample fragments X s Inputting a second Encoder;
the second Encoder extracts a second sequence of sample fragments X S Is the second hidden state Z of (2) b ；
The second Decoder decodes the first signal according to the second hidden state Z b Outputting a second reconstructed sample sequence
In this embodiment, the trained student network is configured to predict bridge health monitoring data to be detected, so as to obtain a prediction result of whether the bridge health monitoring data to be detected is abnormal, and specifically includes:
obtaining bridge health monitoring data segment X to be detected q ；
Bridge health monitoring data segment X to be detected q Inputting Student network Student to obtain second prediction result Student (X q )；
Bridge health monitoring data segment X based on to-be-detected q And a second predictor Student (X q ) Calculating a second outlier score
See formula (11);
a second abnormality score value according to a preset second threshold value beta
And judging and outputting an abnormal prediction result y2 of the bridge health monitoring data, wherein the abnormal prediction result y2 is shown in a formula (12).
For the second outlier value by equation (12)
Judging and obtaining an abnormal prediction result y2 of the bridge health monitoring data segment, and inheriting a binary classification method of the teacher network to carry out second abnormal score value +.>
Making a classification prediction, i.e. determining if +.>
And if the bridge health monitoring data segment is abnormal (y2=0), otherwise, the bridge health monitoring data segment is abnormal (y2=1), wherein beta is a self-defined second threshold value. />
In this embodiment, as shown in FIG. 4a, the Teacher network Teacher K Both encoder and decoder of (a) employ a transducer structure in which the position encoding employs an existing relative position encoding method, a multi-headed attention machineThe number of heads is set to 5, add&Norms represent residual and normalized operations, and feed forward networks employ fully connected neural networks with two hidden layers. Compared with a teacher network, the Student network Student structure is simpler, so that the real-time requirement of abnormality detection on bridge monitoring data is guaranteed by using the trained Student network, and the Student network only comprises a feed-forward full-connection neural network with two layers, as shown in fig. 4 b. The input coding layers of the teacher network and the student network are all single-layer fully-connected neural networks.
Example two
Referring to fig. 5, this embodiment provides a training device for detecting abnormality of bridge health monitoring data, including:
the teacher network training module 21 is configured to obtain a plurality of time series monitoring data sample sets of categories in different fields and a plurality of teacher networks to be trained, input the time series monitoring data sample sets into each corresponding teacher network to be trained according to the categories, train until convergence, and obtain a plurality of trained teacher networks;
further, the teacher network training module 21 includes: the first acquisition unit is used for acquiring time sequence monitoring data sample sets of a plurality of categories in different fields; the second acquisition unit is used for acquiring a plurality of teacher networks to be trained; the first training unit is used for inputting the time sequence monitoring data sample set into each corresponding teacher network to be trained according to the category to train until convergence, and obtaining a plurality of trained teacher networks.
The student network training module 22 is configured to obtain a bridge health monitoring data sample set and a student network to be trained, respectively input the bridge health monitoring data sample set into a plurality of trained teacher networks and the student network to be trained, and perform knowledge distillation training on the student network to be trained by using the plurality of trained teacher networks until convergence to obtain the trained student network;
further, the student network training module 22 includes: the third acquisition unit is used for acquiring a bridge health monitoring data sample set; a fourth acquisition unit for acquiring a student network to be trained; and the second training unit is used for respectively inputting the bridge health monitoring data sample set into a plurality of trained teacher networks and a student network to be trained, and carrying out knowledge distillation training on the student network to be trained by utilizing the plurality of trained teacher networks until convergence to obtain the trained student network.
The trained student network is used for predicting the bridge health monitoring data to be detected so as to obtain a prediction result of whether the bridge health monitoring data to be detected is abnormal or not.
Further, the device also comprises a monitoring data detection module, which is used for acquiring bridge health monitoring data to be detected, inputting the bridge health monitoring data to be detected into a trained student network, and obtaining a prediction result of whether the bridge health monitoring data to be detected is abnormal.
The implementation process of the functions and actions of each module in the above device is specifically detailed in the implementation process of the corresponding steps in the above method, so relevant parts only need to be referred to in the description of the method embodiments, and are not repeated here. The system embodiments described above are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the objectives of the inventive arrangements.
Example III
As shown in fig. 6, the present embodiment provides an electronic apparatus including: processor 310, communication interface (Communications Interface) 320, memory 330 and communication bus 340, wherein processor 310, communication interface 320, memory 330 accomplish communication with each other through communication bus 340. Processor 310 may invoke logic instructions in memory 330, processor 310 executing a training method for bridge health monitoring data anomaly detection, the method comprising:
acquiring time sequence monitoring data sample sets of multiple categories in different fields and multiple teacher networks to be trained, inputting the time sequence monitoring data sample sets into each corresponding teacher network to be trained according to the categories, training until convergence, and acquiring multiple trained teacher networks;
the method comprises the steps of obtaining a bridge health monitoring data sample set and a student network to be trained, respectively inputting the bridge health monitoring data sample set into a plurality of trained teacher networks and the student network to be trained, and performing knowledge distillation training on the student network to be trained by utilizing the plurality of trained teacher networks until convergence to obtain the trained student network;
the trained student network is used for predicting the bridge health monitoring data to be detected so as to obtain a prediction result of whether the bridge health monitoring data to be detected is abnormal or not.
Further, the logic instructions in the memory 330 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions to cause a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, where the computer program product includes a computer program, where the computer program can be stored on a non-transitory computer readable storage medium, where the computer program, when executed by a processor, can perform the training method for detecting anomalies in bridge health monitoring data according to the above method embodiment, and the method includes:
acquiring time sequence monitoring data sample sets of multiple categories in different fields and multiple teacher networks to be trained, inputting the time sequence monitoring data sample sets into each corresponding teacher network to be trained according to the categories, training until convergence, and acquiring multiple trained teacher networks;
the method comprises the steps of obtaining a bridge health monitoring data sample set and a student network to be trained, respectively inputting the bridge health monitoring data sample set into a plurality of trained teacher networks and the student network to be trained, and performing knowledge distillation training on the student network to be trained by utilizing the plurality of trained teacher networks until convergence to obtain the trained student network;
the trained student network is used for predicting the bridge health monitoring data to be detected so as to obtain a prediction result of whether the bridge health monitoring data to be detected is abnormal or not.
Example IV
The present embodiment provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a training method for bridge health monitoring data anomaly detection as described in the above method embodiment, the method comprising:
acquiring time sequence monitoring data sample sets of multiple categories in different fields and multiple teacher networks to be trained, inputting the time sequence monitoring data sample sets into each corresponding teacher network to be trained according to the categories, training until convergence, and acquiring multiple trained teacher networks;
the method comprises the steps of obtaining a bridge health monitoring data sample set and a student network to be trained, respectively inputting the bridge health monitoring data sample set into a plurality of trained teacher networks and the student network to be trained, and performing knowledge distillation training on the student network to be trained by utilizing the plurality of trained teacher networks until convergence to obtain the trained student network;
the trained student network is used for predicting the bridge health monitoring data to be detected so as to obtain a prediction result of whether the bridge health monitoring data to be detected is abnormal or not.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The training method for detecting the abnormality of the bridge health monitoring data is characterized by comprising the following steps of:
acquiring time sequence monitoring data sample sets of multiple categories in different fields and multiple teacher networks to be trained, inputting the time sequence monitoring data sample sets into each corresponding teacher network to be trained according to the categories, training until convergence, and acquiring multiple trained teacher networks;
acquiring a bridge health monitoring data sample set and a student network to be trained, respectively inputting the bridge health monitoring data sample set into the trained multiple teacher networks and the student network to be trained, and performing knowledge distillation training on the student network to be trained by utilizing the trained multiple teacher networks until convergence to obtain the trained student network;
the trained student network is used for predicting the bridge health monitoring data to be detected so as to obtain a prediction result of whether the bridge health monitoring data to be detected is abnormal or not.
2. The training method for bridge health monitoring data anomaly detection of claim 1, wherein each of the teacher networks includes a first encoder and a first decoder;
correspondingly, inputting the time sequence monitoring data sample set into each corresponding teacher network to be trained according to the category to train until convergence, and specifically comprising the following steps:
dividing the time series monitoring data sample set into a first sample segment sequence according to time series;
inputting the first sequence of sample segments into the first encoder;
the first encoder extracts a first concealment state for the first sequence of sample segments;
the first decoder outputs a first reconstructed sample sequence according to the first concealment state;
bringing the first reconstructed sample sequence and the first sample fragment sequence into a first loss function, and completing training when the first loss function converges;
repeating the steps until the plurality of teacher networks to be trained complete training.
3. The training method for detecting anomalies of bridge health monitoring data according to claim 2, further comprising, after the training of the teacher network to be trained is completed, utilizing the teacher network to perform anomaly prediction on monitoring data of respective fields, specifically comprising:
acquiring a monitoring data segment to be detected;
inputting the monitoring data segment to be detected into the corresponding teacher network to obtain a first prediction result;
calculating a first anomaly score value based on the monitored data segment to be detected and the first prediction result;
and judging the first anomaly score value according to a preset first threshold value and outputting an anomaly prediction result corresponding to the field monitoring data.
4. The training method for bridge health monitoring data anomaly detection according to claim 1, wherein the bridge health monitoring data sample set is respectively input into the trained plurality of teacher networks and the student network to be trained, and knowledge distillation training is performed on the student network to be trained by using the trained plurality of teacher networks until convergence, specifically comprising:
dividing the bridge health monitoring data sample set into a second sample fragment sequence according to time sequence;
inputting the second sample fragment sequence into the student network to be trained to obtain a second reconstructed sample sequence output by the student network;
inputting the second sample fragment sequence into the trained multiple teacher networks to obtain a third reconstructed sample sequence output by each teacher network;
and calculating distillation loss according to the second sample fragment sequence, the second reconstructed sample sequence and the third reconstructed sample sequence output by each teacher network, and guiding the student network training by adopting a counter-propagation gradient descent method.
5. The training method for bridge health monitoring data anomaly detection according to claim 4, wherein the distillation loss is calculated according to the second sample fragment sequence, the second reconstructed sample sequence and the third reconstructed sample sequence output by each teacher network, and the student network training is guided by adopting a counter-propagation gradient descent method, and the method specifically comprises the following steps:
calculating a first reconstructed sample error value for the student network based on the second sample fragment sequence and the second reconstructed sample sequence;
calculating a reconstructed sample error value of each teacher network based on the second sample fragment sequence and the third reconstructed sample sequence output by each teacher network, and accumulating to form a second reconstructed sample error value;
calculating a reconstructed sample error value between each teacher network and each student network based on the second reconstructed sample sequence and the third reconstructed sample sequence output by each teacher network, and accumulating to form a third reconstructed sample error value;
and adding the first reconstructed sample error value, the second reconstructed sample error value and the third reconstructed sample error value to obtain an overall error value, and iteratively optimizing the network parameters of the student network until convergence by taking the overall error value as distillation loss to obtain the student network with training completed.
6. The training method for bridge health monitoring data anomaly detection of claim 4, wherein the student network comprises a second encoder and a second decoder;
correspondingly, the second sample fragment sequence is input into the student network to be trained to obtain a second reconstructed sample sequence output by the student network, and the method specifically comprises the following steps:
inputting the second sequence of sample fragments into the second encoder;
the second encoder extracts a second concealment state for the second sequence of sample segments;
the second decoder outputs the second reconstructed sample sequence according to the second concealment state.
7. The training method for detecting anomalies of bridge health monitoring data according to claim 4, wherein the trained student network is configured to predict bridge health monitoring data to be detected to obtain a prediction result of whether the bridge health monitoring data to be detected is anomalies, and specifically comprises:
acquiring bridge health monitoring data segments to be detected;
inputting the bridge health monitoring data segment to be detected into the student network to obtain a second prediction result;
calculating a second abnormal score value based on the bridge health monitoring data segment to be detected and the second prediction result;
and judging the second abnormal score value according to a preset second threshold value and outputting an abnormal prediction result of the bridge health monitoring data.
8. A trainer for bridge health monitoring data anomaly detection, characterized by comprising:
the teacher network training module is used for acquiring time sequence monitoring data sample sets of a plurality of categories in different fields and a plurality of teacher networks to be trained, inputting the time sequence monitoring data sample sets into each corresponding teacher network to be trained according to the categories, training until convergence, and acquiring a plurality of trained teacher networks;
the student network training module is used for acquiring a bridge health monitoring data sample set and a student network to be trained, inputting the bridge health monitoring data sample set into the trained multiple teacher networks and the student network to be trained respectively, and performing knowledge distillation training on the student network to be trained by utilizing the trained multiple teacher networks until convergence to obtain the trained student network;
the trained student network is used for predicting the bridge health monitoring data to be detected so as to obtain a prediction result of whether the bridge health monitoring data to be detected is abnormal or not.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the training method for bridge health monitoring data anomaly detection of any one of claims 1-7 when the program is executed by the processor.
10. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the training method for bridge health monitoring data anomaly detection of any one of claims 1-7.
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