This example shows how to use
cnncodegen to generate code for a Logo classification application that uses deep learning on ARM® processors. The logo classification application uses the
LogoNet series network to perform logo recognition from images. The generated code takes advantage of the ARM Compute library for computer vision and machine learning.
ARM processor that supports the NEON extension
Open Source Computer Vision Library (OpenCV) v3.1
Environment variables for ARM Compute and OpenCV libraries
MATLAB® Coder™ for C++ code generation
The support package MATLAB Coder Interface for Deep Learning
Deep Learning Toolbox™ for using the
For more information, see Prerequisites for Deep Learning with MATLAB Coder.
This example is supported on Linux® and Windows® platforms and not supported for MATLAB Online.
Download the pretrained
LogoNet network and save it as
logonet.mat, if it does not exist. The network was developed in MATLAB® and its architecture is similar to that of AlexNet. This network can recognize 32 logos under various lighting conditions and camera angles.
net = getLogonet();
The network contains 22 layers including convolution, fully connected, and the classification output layers.
ans = 22x1 Layer array with layers: 1 'imageinput' Image Input 227x227x3 images with 'zerocenter' normalization and 'randfliplr' augmentations 2 'conv_1' Convolution 96 5x5x3 convolutions with stride [1 1] and padding [0 0 0 0] 3 'relu_1' ReLU ReLU 4 'maxpool_1' Max Pooling 3x3 max pooling with stride [2 2] and padding [0 0 0 0] 5 'conv_2' Convolution 128 3x3x96 convolutions with stride [1 1] and padding [0 0 0 0] 6 'relu_2' ReLU ReLU 7 'maxpool_2' Max Pooling 3x3 max pooling with stride [2 2] and padding [0 0 0 0] 8 'conv_3' Convolution 384 3x3x128 convolutions with stride [1 1] and padding [0 0 0 0] 9 'relu_3' ReLU ReLU 10 'maxpool_3' Max Pooling 3x3 max pooling with stride [2 2] and padding [0 0 0 0] 11 'conv_4' Convolution 128 3x3x384 convolutions with stride [2 2] and padding [0 0 0 0] 12 'relu_4' ReLU ReLU 13 'maxpool_4' Max Pooling 3x3 max pooling with stride [2 2] and padding [0 0 0 0] 14 'fc_1' Fully Connected 2048 fully connected layer 15 'relu_5' ReLU ReLU 16 'dropout_1' Dropout 50% dropout 17 'fc_2' Fully Connected 2048 fully connected layer 18 'relu_6' ReLU ReLU 19 'dropout_2' Dropout 50% dropout 20 'fc_3' Fully Connected 32 fully connected layer 21 'softmax' Softmax softmax 22 'classoutput' Classification Output crossentropyex with 'adidas' and 31 other classes
On the ARM target hardware, make sure that ARM_COMPUTELIB is set and that LD_LIBRARY_PATH contains the path to the ARM Compute Library folder.
For deep learning on ARM targets, you generate code on the host development computer. Then, you move the generated code to the ARM platform where you build and run the executable program. The target platform must support the Neon instruction set architecture (ISA). Raspberry Pi3, Firefly, HiKey are some of the target platforms on which the generated code can be executed.
cnncodegen, specifying that the target library is the ARM Compute Library. Specify the version of the library and the architecture of the target ARM processor. The
ARMArchitecture parameter is required.
Move the codegen folder and other required files from the host development computer to the target platform by using your preferred
For example on the Linux platform, to transfer the files to the Raspberry Pi, use the scp command with the format:
system('sshpass -p [password] scp (sourcefile) [username]@[targetname]:~/');
system('sshpass -p password scp main_arm_logo.cpp username@targetname:~/'); system('sshpass -p password scp coderdemo_google.png username@targetname:~/'); system('sshpass -p password scp makefile_arm_logo.mk username@targetname:~/'); system('sshpass -p password scp synsetWordsLogoDet.txt username@targetname:~/'); system('sshpass -p password scp -r codegen username@targetname:~/');
On the Windows platform, you can use the
pscp tool that comes with a PuTTY installation. For example,
system('pscp -pw password -r codegen username@targetname:/home/username');
Note: PSCP utilities must be either on your PATH or in your current directory.
To build the library on the target platform, use the generated makefile
For example, to build the library on the Raspberry Pi from the Linux platform:
system('sshpass -p password ssh username@targetname "make -C /home/username/codegen -f cnnbuild_rtw.mk"');
On the Windows platform, you can use the
putty command with
-ssh argument to log in and run the make command. For example:
system('putty -ssh username@targetname -pw password');
To build and run the executable on the target platform, use the command with the format:
make -C /home/$(username) and
./execfile -f makefile_arm_logo.mk
For example, on the Raspberry Pi:
make -C /home/pi arm_neon -f makefile_arm_logo.mk
Run the executable with an input image file.
The top five predictions for the input image file are: