CIFAR-10, CIFAR-100 training with Convolutional Neural Network

  Writing your CNN model This is example of small Convolutional Neural Network definition, CNNSmall

  I also made a slightly bigger CNN, called CNNMedium,

  It is nice to know the computational cost for Convolution layer, which is approximated as, $$ H_I \times W_I \times CH_I \times CH_O \times kernel_size ^ 2 $$ $ CH_I $   : Input image channel $ CH_O $ : Output image channel $ H_I $      : Input image height $ W_I $     : Input image width $ k $           : kernal size (assuming same for width & height)   In above CNN definitions, the size of the channel is bigger for […]

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CIFAR-10, CIFAR-100 dataset introduction

cifar10_plot

  Source code is uploaded on github. CIFAR-10 and CIFAR-100 are the small image datasets with its classification labeled. It is widely used for easy image classification task/benchmark in research community. Official page: CIFAR-10 and CIFAR-100 datasets In Chainer, CIFAR-10 and CIFAR-100 dataset can be obtained with build-in function. Setup code: 

  CIFAR-10 chainer.datasets.get_cifar10 method is prepared in Chainer to get CIFAR-10 dataset. Dataset is automatically downloaded from https://www.cs.toronto.edu only for the first time, and its cache is used from second time.

The dataset structure is quite same with MNIST dataset, it is TupleDataset.train[i] represents i-th data, there are 50000 training data.test data structure is same, with 10000 […]

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Understanding convolutional layer

convolution_layer

Source code is uploaded on github.The sample image is obtained from PEXELS. What is the difference between convolutional layer and linear layer? What kind of intuition is in behind of using convolutional layer in deep neural network? This hands on shows some effects by convolutional layer to provide some intution about what convolutional layer do.  

    Above type of diagram often appears in Convolutional neural network field. Below figure explains its notation. Cuboid represents the “image” array where this image might not mean the meaningful picture. Horizontal axis represents channel number, vertical axis for image height and depth axis for image width respectively.   Convolution layer – […]

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Basic image processing tutorial

RGB_color

Basic image processing for deep learning. Refer github for the source code. The sample image is obtained from PEXELS. If you are not familiar with image processing, you can read this article before going to convolutional neural network. OpenCV is image processing library which supports loading image in numpy.ndarray format, save image converting image color format (RGB, YUV, Gray scale etc) resize and other useful image processing functionality. To install opencv, execute $conda install -c https://conda.binstar.org/menpo -y opencv3

  Loading and save image cv2.imread for loading image. cv2.imwrite for save image. plt.imshow for plotting, and plt.savefig for save plot image. OpenCV image format is usually 3 dimension (or 2 dimension if […]

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