## 19 Jan deep neural network for image classification: application week 4

# As usual you will follow the Deep Learning methodology to build the model: # 1. Building your Deep Neural Network: Step by Step. Simple Neural Network. # The "-1" makes reshape flatten the remaining dimensions. Deep Residual Learning for Image Recognition, 2016; API. Check if the "Cost after iteration 0" matches the expected output below, if not click on the square (⬛) on the upper bar of the notebook to stop the cell and try to find your error. Have you tried running all the cell in proper given sequence. They work phenomenally well on computer vision tasks like image classification, object detection, image recogniti… If we increase the number of layers in a neural network to make it deeper, it increases the complexity of the network and allows us to model functions that are more complicated. # Backward propagation. Outputs: "dA1, dW2, db2; also dA0 (not used), dW1, db1". This is the simplest way to encourage me to keep doing such work. # Get W1, b1, W2 and b2 from the dictionary parameters. Let's get more familiar with the dataset. Deep Neural Network for Image Classification: Application. Improving Deep Neural Networks: Initialization. For an example showing how to use a custom output layer to build a weighted classification network in Deep Network Designer, see Import Custom Layer into Deep Network Designer. However, here is a simplified network representation: As usual you will follow the Deep Learning methodology to build the model: Good thing you built a vectorized implementation! These convolutional neural network models are ubiquitous in the image data space. What is Neural Network: Overview, Applications, and Advantages Lesson - 2. Week 4 lecture notes. # # Deep Neural Network for Image Classification: Application # # When you finish this, you will have finished the last programming assignment of Week 4, and also the … Keras Applications API; Articles. They can then be used to predict. This tutorial is Part 4 … # - Build and apply a deep neural network to supervised learning. This goal can be translated into an image classification problem for deep learning models. Image Classification and Convolutional Neural Networks. Logistic Regression with a Neural Network mindset. # change this to the name of your image file, # the true class of your image (1 -> cat, 0 -> non-cat), # - for auto-reloading external module: http://stackoverflow.com/questions/1907993/autoreload-of-modules-in-ipython. In this post you will discover amazing and recent applications of deep learning that will inspire you to get started in deep learning. Very Deep Convolutional Networks for Large-Scale Image Recognition, 2014. Face recognition. Inputs: "X, W1, b1, W2, b2". Build things. # - The corresponding vector: $[x_0,x_1,...,x_{12287}]^T$ is then multiplied by the weight matrix $W^{[1]}$ and then you add the intercept $b^{[1]}$. # Congratulations on finishing this assignment. # __Detailed Architecture of figure 2__: # - The input is a (64,64,3) image which is flattened to a vector of size $(12288,1)$. # **Question**: Use the helper functions you have implemented in the previous assignment to build a 2-layer neural network with the following structure: *LINEAR -> RELU -> LINEAR -> SIGMOID*.

The model can be summarized as: ***[LINEAR -> RELU] $\times$ (L-1) -> LINEAR -> SIGMOID***. Assume that you have a dataset made up of a great many photos of cats and dogs, and you want to build a model that can recognize and differentiate them. After this assignment you will be able to: Build and apply a deep neural network to supervised learning. I will try my best to solve it. # - np.random.seed(1) is used to keep all the random function calls consistent. This process could be repeated several times for each. The input is a (64,64,3) image which is flattened to a vector of size (12288,1). You are doing something wrong with the executing the code.Please check once. fundamentals of scalable data science week 1 assignment in coursera solution I am finding some problem, Hi. # Forward propagation: LINEAR -> RELU -> LINEAR -> SIGMOID. # change this to the name of your image file, # the true class of your image (1 -> cat, 0 -> non-cat), I tried to provide optimized solutions like, Coursera: Neural Networks & Deep Learning, http://stackoverflow.com/questions/1907993/autoreload-of-modules-in-ipython, Post Comments The cost should be decreasing. Neural networks with extensively deep architectures typically contain millions of parameters, making them both computationally expensive and time-consuming to train. Load data.This article shows how to recognize the digits written by hand. 1 line of code), # Retrieve W1, b1, W2, b2 from parameters, # Print the cost every 100 training example. Pretrained image classification networks have been trained on over a million images and can classify images into 1000 object categories, such as keyboard, coffee mug, pencil, and many animals. # $12,288$ equals $64 \times 64 \times 3$ which is the size of one reshaped image vector. Recipe for Machine Learning. The code is given in the cell below. Coursera: Neural Networks and Deep Learning (Week 4B) [Assignment Solution] - deeplearning.ai. Top 8 Deep Learning Frameworks Lesson - 4. Face verification v.s. You can use your own image and see the output of your model. Over the past few years, deep learning techniques have dominated computer vision.One of the computer vision application areas where deep learning excels is image classification with Convolutional Neural Networks (CNNs). Cat appears against a background of a similar color, Scale variation (cat is very large or small in image). Neural Networks Overview. ### START CODE HERE ### (≈ 2 lines of code). First I started with image classification using a simple neural network. Initialize parameters / Define hyperparameters, # d. Update parameters (using parameters, and grads from backprop), # 4. # - Finally, you take the sigmoid of the final linear unit. To see your predictions on the training and test sets, run the cell below. It may take up to 5 minutes to run 2500 iterations. The code is given in the cell below. I have recently completed the Neural Networks and Deep Learning course from Coursera by deeplearning.ai # Now, you can use the trained parameters to classify images from the dataset. In this review, which focuses on the application of CNNs to image classification tasks, we cover their development, from their predecessors up to recent state-of-the-art deep learning systems. # Backward propagation. parameters -- parameters learnt by the model. X -- input data, of shape (n_x, number of examples), Y -- true "label" vector (containing 0 if cat, 1 if non-cat), of shape (1, number of examples), layers_dims -- dimensions of the layers (n_x, n_h, n_y), num_iterations -- number of iterations of the optimization loop, learning_rate -- learning rate of the gradient descent update rule, print_cost -- If set to True, this will print the cost every 100 iterations, parameters -- a dictionary containing W1, W2, b1, and b2, # Initialize parameters dictionary, by calling one of the functions you'd previously implemented, ### START CODE HERE ### (≈ 1 line of code). # **Question**: Use the helper functions you have implemented previously to build an $L$-layer neural network with the following structure: *[LINEAR -> RELU]$\times$(L-1) -> LINEAR -> SIGMOID*. Input: image, name/ID; Output: Whether the imput image is that of the claimed person; Recognition. # - The corresponding vector: $[x_0,x_1,...,x_{12287}]^T$ is then multiplied by the weight matrix $W^{[1]}$ of size $(n^{[1]}, 12288)$. ImageNet Classification with Deep Convolutional Neural Networks, 2012. # Forward propagation: [LINEAR -> RELU]*(L-1) -> LINEAR -> SIGMOID. Congratulations on finishing this assignment. The input is a (64,64,3) image which is flattened to a vector of size. Hopefully, you will see an improvement in accuracy relative to your previous logistic regression implementation. # You will then compare the performance of these models, and also try out different values for $L$. It is hard to represent an L-layer deep neural network with the above representation. layers_dims -- list containing the input size and each layer size, of length (number of layers + 1). Early stopping is a way to prevent overfitting. # Though in the next course on "Improving deep neural networks" you will learn how to obtain even higher accuracy by systematically searching for better hyperparameters (learning_rate, layers_dims, num_iterations, and others you'll also learn in the next course). # __Detailed Architecture of figure 3__: # - The input is a (64,64,3) image which is flattened to a vector of size (12288,1).

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