CN112199980A - Overhead line robot obstacle identification method - Google Patents
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- 238000013527 convolutional neural network Methods 0.000 claims description 28
- 230000005540 biological transmission Effects 0.000 claims description 20
- 239000011159 matrix material Substances 0.000 claims description 19
- 230000006870 function Effects 0.000 claims description 17
- 238000007689 inspection Methods 0.000 claims description 11
- 210000002569 neuron Anatomy 0.000 claims description 8
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- 239000011229 interlayer Substances 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract description 3
- 230000004888 barrier function Effects 0.000 description 4
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- G06V10/443—Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersections; Connectivity analysis, e.g. of connected components by matching or filtering
- G06V10/449—Biologically inspired filters, e.g. difference of Gaussians [DoG] or Gabor filters
- G06V10/451—Biologically inspired filters, e.g. difference of Gaussians [DoG] or Gabor filters with interaction between the filter responses, e.g. cortical complex cells
- G06V10/454—Integrating the filters into a hierarchical structure, e.g. convolutional neural networks [CNN]
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- G06V20/56—Context or environment of the image exterior to a vehicle by using sensors mounted on the vehicle
- G06V20/58—Recognition of moving objects or obstacles, e.g. vehicles or pedestrians; Recognition of traffic objects, e.g. traffic signs, traffic lights or roads
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Abstract
The application discloses an overhead line robot obstacle identification method, which is characterized in that deployment is carried out on the basis of an interlayer compression formula with strict closed form guarantee, and then relearning is carried out, so that the response between an original network and a compressed network is kept consistent. The method of the present application proposes a new compression scheme based on low-order decomposition that simultaneously accelerates convolutional layers and decompresses fully connected layers with precise closure. In order to further reduce the precision loss caused by the compression scheme of the order decomposition under the high compression rate, the method of the application further provides an effective knowledge transfer scheme, and the output and the intermediate response of the original network are aligned with the compression network in an 'explicit' mode. The proposed knowledge transfer scheme format operates a non-linear transformation function within all layers and between layers and minimizes "local" and "global" reconstruction errors in a uniform manner.
Description
Technical Field
The application relates to the technical field of electrical equipment, in particular to an overhead line robot obstacle identification method.
Background
The operation condition of the high-voltage overhead transmission line directly influences the distribution condition of the power system, and plays a key role in the safe and stable operation of the power system, so that the operation condition of the high-voltage overhead transmission line needs to be regularly checked. In recent years, the development of mobile robot technology provides a new idea for the inspection of overhead power lines, and the inspection mode of high-voltage overhead power transmission lines is converted from manual inspection to special robot inspection.
The overhead line inspection robot (hereinafter referred to as an overhead line robot) is used for detecting and repairing line defects, and when the overhead line inspection robot is used in practice and crawls along a power transmission line at a certain speed, various obstacle types such as a vibration damper, a strain clamp and the like on a high-voltage wire need to be identified, and corresponding measures can be taken to cross the obstacles.
At present, when an overhead line robot performs line patrol operation, a camera mounted on the overhead line robot captures image information on a high-voltage line in real time, and then obstacle identification is performed through a convolutional neural network model. However, in the process of training the convolutional neural network model, a large amount of running memory and calculation amount of a processor are usually consumed, and the fast update of the convolutional neural network model is influenced, so that the identification efficiency of the overhead line robot on the obstacle is influenced.
Disclosure of Invention
The application provides an overhead line robot obstacle identification method, which aims to solve the problems that the existing convolutional neural network model for identifying obstacles on a high-voltage overhead transmission line consumes a large amount of processor running memory and calculated amount in the training process, and the fast update of the convolutional neural network model is influenced, so that the identification efficiency of the overhead line robot on the obstacles is influenced.
The application provides an overhead line robot obstacle identification method, which comprises the following steps:
constructing a convolutional neural network identification model;
acquiring a training set, wherein the training set is an obstacle image sample on a high-voltage overhead transmission line;
training a convolutional neural network recognition model by using a training set by adopting a low-order decomposition learning method with knowledge transfer;
the overhead line inspection robot captures line condition image information on the high-voltage overhead transmission line in real time by using a camera carried by the overhead line inspection robot and sends the line condition image information to the trained convolutional neural network identification model;
and the trained convolutional neural network recognition model is used for recognizing the obstacles on the high-voltage overhead transmission line according to the line condition image information.
Optionally, a low-order decomposition learning method with knowledge transfer is adopted, and the convolutional neural network recognition model is trained by using a training set, including,
constructing a set of low-rank filter bases with rank 1 in the spatial domain, decomposing each convolutional layer of the convolutional neural network identification model into two new convolutional layers with rectangular filters by using the low-rank filter bases, and expressing the new convolutional layers with the rectangular filters as follows:
in the formula, Ki,j,c,nIs a tensor with size of dxdxCxN;
using formulasSolving the approximate solution of the filter bases gamma and V, wherein the solved (gamma, V) is a group of low-order constraint filters, and T is represented by the formulanIs a filter bank;
using low rank decomposition, two small convolution kernels replace the large convolution kernel in the convolutional layer, two small matrix weights replace the large matrix weight in the fully-connected layer, and the corresponding acceleration ratio S in the convolutional layerrAnd compression ratio in full connection layer CrComprises the following steps:
and transferring the whole and local knowledge between the original network and the compressed network by adopting a knowledge transfer method.
The global and local knowledge is transferred between the original network and the compressed network, optionally using a knowledge transfer method, including,
establishing a local loss function by using the Euclidean distance between the ith layer lead block of the neural network and the output of the base block; suppressing the vanishing gradients by using a local loss function;
learning parameters of a compression network from a fixed original network to form asymmetric connections of the original network and the compression network with different depths, wherein for the decomposed low-rank network, a loss function is as follows:
in the formula (I), the compound is shown in the specification,the output of the i layer neuron guide block and the output of the base block are respectively, and the size is mi;
Combining the global knowledge with the local knowledge, the compression network is trained by minimizing the global loss function, as shown in the following formula:
where H represents the cross-entropy loss in the knowledge transfer, L represents the guide and base blocks, and λiIs a set of penalty parameters for balancing the global penalty and each local penalty;
training based on the formula (6) and the formula (8) to obtain a neuron network, and in a network full-connection layer, performing matrix multiplication operation on an input matrixAnd weight matrixMultiplying to obtain an output matrix
Z=WX (9)。
Optionally, the process of acquiring the obstacle image sample is: an obstacle recognition positioning camera on the overhead line robot acquires an obstacle image sample.
Optionally, the obstacle of the high-voltage overhead transmission line comprises a damper, a strain clamp, an insulator and a suspension clamp.
The method aims to jointly compress the convolution layer and the complete connection layer so as to accelerate online reasoning and reduce memory consumption at the same time. The method of the application is firstly deployed based on an interlayer compression formula with strict closed form guarantee, and then relearning is carried out, so that the response between the original network and the compression network is kept consistent. The method of the present application proposes a new compression scheme based on low-order decomposition that simultaneously accelerates convolutional layers and decompresses fully connected layers with precise closure. In order to further reduce the precision loss caused by the compression scheme of the order decomposition under the high compression rate, the method of the application further provides an effective knowledge transfer scheme, and the output and the intermediate response of the original network are aligned with the compression network in an 'explicit' mode. The proposed knowledge transfer scheme format operates a non-linear transformation function within all layers and between layers and minimizes "local" and "global" reconstruction errors in a uniform manner.
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In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of an overhead line robot obstacle identification method according to the present application.
Detailed Description
The application provides an overhead line robot obstacle identification method, which is used for identifying obstacles on a high-voltage overhead transmission line by an overhead line robot. Fig. 1 is a flowchart of an overhead line robot obstacle identification method according to the present application, where the overhead line robot obstacle identification method includes:
and S100, constructing a convolutional neural network identification model.
And S200, acquiring a training set, wherein the training set is an obstacle image sample on the high-voltage overhead transmission line.
In this application, the process of obtaining the obstacle image sample is: an obstacle recognition positioning camera on the overhead line robot acquires an obstacle image sample. The obstacle of the high-voltage overhead transmission line comprises an anti-vibration hammer, a strain clamp, an insulator and a suspension clamp.
And step S300, training the convolutional neural network recognition model by using a training set by adopting a low-order decomposition learning method with knowledge transfer.
In the application, a low-order decomposition learning method with knowledge transfer is adopted, and a convolutional neural network recognition model is trained by using a training set, comprising,
step S310, constructing the neural network convolution layer with the filter, which specifically includes the following steps.
Step S311, constructing a set of low-rank filter bases with rank 1 in the spatial domain, and decomposing each convolutional layer of the convolutional neural network identification model into two new convolutional layers with rectangular filters by using the low-rank filter bases, where the new convolutional layers with rectangular filters are represented as:
in the formula, Ki,j,c,nIs a tensor of size d × d × C × N.
A convolutional neural network can be seen as a forward multi-layer network structure that maps an input image to a particular output vector. The cells in a convolutional neural network are organized into a series of stereo tensors with two spatial dimensions and a third "map" or "channel" squared latitude.
Step S312, for the formulaA set of low rank filter bases in the spatial domain is constructed using a low order decomposition learning method, with each convolutional layer decomposed into two new convolutional layers with rectangular filters. The convolution with the filter is expressed as:
in the formula, TnIs a filter bank.
Step S313, using the formulaSolving the approximate solution of the filter bases gamma and V, wherein the solved (gamma, V) is a group of low-order constraint filters, and T is represented by the formulanIs a filter bank;
step S320, using low rank decomposition, using two small convolution kernels for convolution layerReplacing the large matrix weight with two small matrix weights in the fully connected layer, the corresponding acceleration ratio S in the convolutional layerrAnd compression ratio in full connection layer CrComprises the following steps:
compared with the original convolution and matrix multiplication in the classical neuron network, the method only needs addition operation in the convolution layer and parameters in the complete connection layer.
And step S330, transferring the whole and local knowledge between the original network and the compressed network by adopting a knowledge transfer method.
In order to ensure the training effect of the neural network, the compressed network trimmed by the original network is usually trained together with the original network, and when the weight of a certain network in the training process is smaller (smaller than a set threshold), the network is set to be 0; shielding the network set to 0, and continuing training after updating; and after training for several rounds, continuously pruning to finally obtain the compressed network. Directly applying low rank decomposition to multiple layer neuron networks results in approximation errors for each layer, further accumulating and propagating.
The application constructs a local loss function using a knowledge transfer method to correct the output of the compressed network and the original network, and the function considers the local asymmetric reconstruction error and the global reconstruction error simultaneously so as to reduce the overall error of the final output layer. Within this framework, local reconstruction errors and global accumulation errors between the compressed network and the original network are incorporated into a comprehensive objective function to explicitly demonstrate knowledge. The method regards an original network as a resource field and regards a compressed network as a target field. To produce better representation knowledge, the method combines the incentivized global accumulated errors with local reconstructed errors to share the shared spatial components of the representation.
In the application, a knowledge transfer method is adopted to transfer whole and local knowledge between an original network and a compressed network, and the method comprises the following steps of S331, building a hidden layer for supervision, and learning local knowledge, and specifically comprises the following steps:
establishing a local loss function by using the Euclidean distance between the ith layer lead block of the neural network and the output of the base block; suppressing the vanishing gradients by using a local loss function;
learning parameters of a compression network from a fixed original network to form asymmetric connections of the original network and the compression network with different depths, wherein for the decomposed low-rank network, a loss function is as follows:
in the formula (I), the compound is shown in the specification,the output of the i layer neuron guide block and the output of the base block are respectively, and the size is mi。
Step S332, combining the global knowledge with the local knowledge, and training the compression network by minimizing the global loss function, as shown in the following formula:
where H represents the cross-entropy loss in the knowledge transfer, L represents the guide and base blocks, and λiIs a set of penalty parameters for balancing the global penalty and each local penalty;
based on formulaAnd formulaTraining to obtain neuron network, and multiplying the input matrix by matrix in the network full-connection layerAnd weight matrixMultiplying to obtain an output matrixI.e., Z ═ WX.
And S400, capturing the line condition image information on the high-voltage overhead transmission line in real time by using a camera carried by the overhead line inspection robot, and sending the line condition image information to the trained convolutional neural network identification model.
In this application, overhead line patrols and examines robot and utilizes the camera that it carried to catch the line condition image information on the high tension overhead transmission line in real time, include, install high definition camera on overhead line patrols and examines robot body and operation arm, make overhead line patrols and examines robot and can normally shoot the barrier that needs strideed across or dodge at the during operation high definition camera, the high definition camera visual angle should be able to cover the full physiognomy of barrier, makes its characteristic of catching the barrier as much as possible.
And S500, identifying the obstacle on the high-voltage overhead transmission line by the trained convolutional neural network identification model according to the line condition image information.
In this application, convolutional neural network identification model after the training discerns the barrier on the overhead transmission line of high tension according to line condition image information, includes: and step S510, inputting the line condition image information into the convolutional neural network identification model in real time. And step S520, identifying the obstacle type shot by the camera in real time by the trained convolutional neural network identification model.
The method aims to jointly compress the convolution layer and the complete connection layer so as to accelerate online reasoning and reduce memory consumption at the same time. The method of the application is firstly deployed based on an interlayer compression formula with strict closed form guarantee, and then relearning is carried out, so that the response between the original network and the compression network is kept consistent. The method of the present application proposes a new compression scheme based on low-order decomposition that simultaneously accelerates convolutional layers and decompresses fully connected layers with precise closure. In order to further reduce the precision loss caused by the compression scheme of the order decomposition under the high compression rate, the method of the application further provides an effective knowledge transfer scheme, and the output and the intermediate response of the original network are aligned with the compression network in an 'explicit' mode. The proposed knowledge transfer scheme format operates a non-linear transformation function within all layers and between layers and minimizes "local" and "global" reconstruction errors in a uniform manner.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (5)
1. An overhead line robot obstacle recognition method is characterized by comprising the following steps:
constructing a convolutional neural network identification model;
acquiring a training set, wherein the training set is an obstacle image sample on a high-voltage overhead transmission line;
training a convolutional neural network recognition model by using a training set by adopting a low-order decomposition learning method with knowledge transfer;
the overhead line inspection robot captures line condition image information on the high-voltage overhead transmission line in real time by using a camera carried by the overhead line inspection robot and sends the line condition image information to the trained convolutional neural network identification model;
and the trained convolutional neural network recognition model is used for recognizing the obstacles on the high-voltage overhead transmission line according to the line condition image information.
2. The overhead line robot obstacle recognition method according to claim 1,
training a convolutional neural network recognition model by using a training set by adopting a low-order decomposition learning method with knowledge transfer, comprising,
constructing a set of low-rank filter bases with rank 1 in the spatial domain, decomposing each convolutional layer of the convolutional neural network identification model into two new convolutional layers with rectangular filters by using the low-rank filter bases, and expressing the new convolutional layers with the rectangular filters as follows:
in the formula, Ki,j,c,nIs a tensor with size of dxdxCxN;
using formulasSolving the approximate solution of the filter bases gamma and V, wherein the solved (gamma, V) is a group of low-order constraint filters, and T is represented by the formulanIs a filter bank;
using low rank decomposition, two small convolution kernels replace the large convolution kernel in the convolutional layer, two small matrix weights replace the large matrix weight in the fully-connected layer, and the corresponding acceleration ratio S in the convolutional layerrAnd compression ratio in full connection layer CrComprises the following steps:
and transferring the whole and local knowledge between the original network and the compressed network by adopting a knowledge transfer method.
3. The overhead line robotic obstacle identification method of claim 2, wherein the global and local knowledge is transferred between the original network and the compressed network using a knowledge transfer method, comprising,
establishing a local loss function by using the Euclidean distance between the ith layer lead block of the neural network and the output of the base block; suppressing the vanishing gradients by using a local loss function;
learning parameters of a compression network from a fixed original network to form asymmetric connections of the original network and the compression network with different depths, wherein for the decomposed low-rank network, a loss function is as follows:
in the formula (I), the compound is shown in the specification,the output of the i layer neuron guide block and the output of the base block are respectively, and the size is mi;
Combining the global knowledge with the local knowledge, the compression network is trained by minimizing the global loss function, as shown in the following formula:
where H represents the cross-entropy loss in the knowledge transfer, L represents the guide and base blocks, and λiIs a set of penalty parameters for balancing the global penalty and each local penalty;
training based on the formula (6) and the formula (8) to obtain a neuron network, and in a network full-connection layer, performing matrix multiplication operation on an input matrixAnd weight matrixMultiplying to obtain an output matrix
Z=WX (9)。
4. The overhead line robot obstacle recognition method of claim 1, wherein the process of acquiring obstacle image samples is: an obstacle recognition positioning camera on the overhead line robot acquires an obstacle image sample.
5. The overhead line robot obstacle recognition method of claim 1, wherein the obstacle of the high voltage overhead transmission line comprises a damper, a strain clamp, an insulator, and a suspension clamp.
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