Best Cnn Model For Image Classification

Best Cnn Model For Image Classification – In machine learning, convolutional neural networks (CNN or ConvNet) are complex feed forward neural networks. CNN is used for image classification and recognition because of its high accuracy. It was proposed by computer scientist Yann LeCun in the late 90s, when he was inspired by the human visual perception of things. CNN follows a hierarchical structure that works in building a network, like a funnel, and finally produces a fully connected layer where all the neurons are connected to each other and the results are processed.

We will build a new ConvNet step by step in this article to explain it further. In this example, we will implement the (National Institute of Standards and Technology) MNIST data set for image classification. The dataset consists of ten digits from 0 to 9. It contains 55,000 images – the test set contains 10,000 images and the validation set contains 5,000 images. We will build a convnet composed of two hidden layers or transform layers. Now let’s take a look at one of the images and the image dimensions. Here is the picture, which is number 7.

Best Cnn Model For Image Classification

Best Cnn Model For Image Classification

The dimensions of this image are 28 × 28 which is represented in the form of a matrix (28, 28). And the depth or number of centers this image has is 1, because it is a gray image. If it was a color image (for example, RGB), the number of channels would be three.

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Now, the first step is to define all the functions that we will use in building the model. TensorFlow is a large computational graph that helps build the functions and variables by just giving them a shape or size and not storing data in them. It’s like drawing a blueprint of a bridge before you start laying bricks.

Once we have an input image (28×28), the filter is run on all pixels (rows, columns) of the image capturing the data as in the image below. This is passed to the integration layer, where it performs the arithmetic calculation and returns the specified result.

Here, the filter is the nxn (3 × 3) dimensional weight matrix in the figure above. Weights are initialized as random numbers with some standard deviation to create normally distributed values. The filter is run on all values ​​in the matrix and the dot product of weights and pixels is calculated.

Let’s define our weights and biases function. Tensorflow provides services like ‘Variable’ which helps to store it as an object and you can go through the different commands defined earlier in this page.

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Now let’s build a function that returns the conversion array. Here, we need to consider some parameters before building it. First will be the weight of the matrix or the size of the filter that will slide over all the values ​​of the matrix. Let’s consider the size of the filter to be 5 × 5 and step 2. Stride is the number of pixels you jump or slide up in each iteration. Then we have the number of channels, which is the depth of the image. Since the images are in grayscale, the depth is 1. After that, we pass this layer to the Rectified Linear Unit (Relu) activation function.

In Python with the TensorFlow library, the structure is as follows, but we need to establish the shape and length of our variables here – which are weights and biases.

The input to TensorFlow should be a four-dimensional vector. For example, [A, B, C, D]. Here, A is the number of samples considered in each iteration (the number of images, in this case). B and C are image shape or image structural information (B(28), C(28)). And d is the number of channels of the input image, 1 in this case, because the image is in grayscale. Now let’s build the conversion layer function.

Best Cnn Model For Image Classification

In the code above, the ‘dimensions’ are nothing but the shape of the weight matrix. We have set padding = ‘same’, which means that the filtered image after the weighted dot product will have the same dimensions as the input image. Here, a detailed explanation of padding is provided by the famous Chinese-American computer scientist Andrew Ng.

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After we have the blended layers, we need to layer them. For this, we take the shape of the image – the 2nd and 3rd elements in our complexity array along with the 4th element which is the number of filters. Multiplying all these, we get the flattened output form which is 1, 568.

Let’s dig into the math to find the right block and output specs for the conversion array.

In this data set, all images are 28 x 28. When we pass one of the images through our first transform layer, we get a total of 16 channels with dimensions reduced from 28 × 28 to 14 × 14. This is done with the help of of cotton. When we add 2 layers of 0 to the outer layers of the image and pass it through the concatenation layer, the output size is reduced to half of the input.

Once we merge two of the layers, we get a 7x7x32 result. This is passed into a softmax function to find probabilities and assign classes. The optimizer we used here is AdamOptimizer, which helps to reduce the cost calculated by cross entropy. The accuracy of the training image with 2 hidden layers, filter size 5, 2 pads, output channels of the first and second layer as 16 and 32 for compression, and Relu and Softmax (interaction cost) are as follows.

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We can change the parameters and build a network with a large number of iterations and a large number of layers to produce better results. This will depend on the computing power of your system.

Kishan Maladkar has a degree in Electronics and Communication Engineering, exploring the field of machine learning and artificial intelligence. Data science enthusiast who loves to read about computational engineering and contribute to the technology that shapes our world. He is a statistician by day and a gamer by night.

Our mission is to bring better informed and more informed decisions about technology through authoritative, influential and credible journalism. Image classification is one of the areas where deep learning models are used very effectively for practical applications. It is an active area of ​​research. Many methods have been proposed and many more are emerging. The most successful Deep Learning models like ImageNet, GoogleNet that perform as well as or better than humans are large and complex models.

Best Cnn Model For Image Classification

Therefore, as a beginner you may find it difficult to find a working model with a suitable performance at the right time. In this article I will try to introduce some basic architectures that we can design to perform image classification. Along the way I will share code samples related to some metrics that describe the performance of the models. Ultimately establishing a model that is trained at the right time and gives acceptable performance.

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The computer on which the experiments were performed is a PC with an average configuration without any GPU that supports the implementation of the DNN model. The goal is to achieve the right time with this performance and configuration.

As a first model, the Deep Neural Network (DNN) model is discussed. We can effectively train a simple neural network to perform regression and classification. However, DNN does not perform well with images. An overview of the implementation with DNN is shown in the image below.

Model = string() model.add(flat(input_shape = input_shape)) model.add(dense(128)) model.add(activation(‘relu’)) model.add(dropout(0.5)) model.add(dense ) (64)) model.add(Activation(‘relu’)) model.add(Dropout(0.5)) model.add(Dense(1)) model.add(Activation(‘tanh’)) model.compile(optimizer = ‘rmsprop’ , loss = ‘binary_crossentropy’ , metrics = [ ‘accuracy’ ])

To reduce the training time, I have resized the input images to 64×64 so, the input shape is 64x64x3. The first layer flattens the input to a 1D gradient which is fed to the density layer.

Overview Of Convolutional Neural Network In Image Classification

The accuracy of the model is poor, we can improve the performance of DNN by

However, we will not look into that here. Instead, we will go to another model: convolution neural networks.

Convolution layers have proven to be very successful in tasks involving images, e.g. Image classification, object identification, face recognition etc. It allows sharing of parameters which results in a much improved network compared to using Layer Four. The following is a good resource for understanding convolutional neural networks:

Best Cnn Model For Image Classification

Model = sequence() model.add(Conv2D(32, (3, 3), input_shape = input_shape)) model.add(Activation(‘relu’)) model.add(MaxPooling2D(pool_size=(2,2))) model.add(Conv2D(32, (3, 3)))) model.add(Activation(‘relu’)) model.add(MaxPooling2D(pool_size=(2,2))) model.add(Conv2D(64, ( 3, 3))) model.add(activation(‘relu’)) model.add(maxpooling2d(pool_size=(2,2))) model.add(flat()) #flatter fiatue tensor to 1d model.add . (dens(64)) model.add(activation(‘relu’)) model.add(dropout(0.5)) model.add(dens(1)) model.add(activation(‘sigmoid’)) model.compile( loss = ‘binary_crossentropy’, optimizer = ‘rmsprop’, metric = [‘accuracy’]) output:

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As the results suggest, CNN performs better when dealing with images. We have reduced the training time by almost 1 hour. The training loss is greatly improved but the validation loss is still higher indicating better fit. We can further validate our model to reduce the fit or we can use any proposed method in DNN