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There are n cars at given miles away from the starting mile 0, traveling to reach the mile target.You are given two integer arrays, position and speed, both of length n, where position[i] is the starting mile of the ith car and speed[i] is the speed of the ith car in miles per hour. A car cannot pass another car, but it can catch up and then travel next to it at the speed of the slower car. A ca..

Given an array of integers temperatures represents the daily temperatures, return an array answer such that answer[i] is the number of days you have to wait after the ith day to get a warmer temperature. If there is no future day for which this is possible, keep answer[i] == 0 instead.  A key point of this question was to make the stack in ascending order. Since we are finding the number of days..

1. IntroFirst ML project - Predicting the species of iris flowers Uses classfication method, a typical method of supervised learning, to predict the species of iris flower.Also going to use decision tree for the algorithm.  Dataset We have to first have to take a glance at the dataset.It has features of sepal length, width, petal length, width, and label. Label represents the species of sample d..

1. IntuitionEx) Cat Classification exampleWe have three different features(Ear shape, Face shape, Whiskers) of cats to determine whether the given image of an animal is a cat or not.  TerminologyDecision tree algorithm in machine learning shares the same knowledge of the tree data structure in computer science. The top node of a tree represents the root node. Nodes at the very bottom of the tree..

1. Machine Learning Development Process 1.1 Cycle of ML process Step 1: Choose Architecture (mode, data, etc) Step 2: Train Model Step 3: Diagnostics (bias, variance, and error analysis) Step 4: Deploy in production(Deploy, moinor and maintain system) 1.2 Example (Spam Classification Example) Example: Spam Classification Example Supervised Learning Algorithm x = feature of spam emails y = whethe..

1. Advice for applying machine learning 1-1. Intuition In order to make a efficient machine learning model, we have to make a good decision. Then, how do we make a good decision? Ex) Problem: We implemented a regularized linear regression on housing prices, but the accuracy of the model is low. Possible answer: More training examples, try smaller or bigger features, add polynomial features, incr..

1. Details of training #Step 1 : Specify how to compute output given x and parameters w, b (define model)#Math : f_w,b(x) = ?#Logistic Regressionz = np.dot(w,x) + b#Step 2 : Specify loss and cost#Math: L(f_w,b(x), y)# J(w,b) = 1/m sigma L (f_w,b(x(i)), y[i])f_x = 1 / (1 + np.exp(-z))loss = -y * np.log(f_x) - (1 - y) * np.log(1 - f_x)#Train on data to minimize J(w,b)w = w - alpha * dj_dwb = b- ..

1. Neurons and the brain Origins: Algorithms that try to mimic the brain Development RoadMap: speech -> images -> text(NLP) -> ... Since the development of Large Neural Network and GPU, we could perform many different task using the "Big Data". 2. Example - Demand Prediction We use sigmoid function to solve the classification problem. We called the function we use f(x). In the neural network, we..

This is the overview of supervised learning. Based on the characteristics of problems, we can divide problems into regression and classification. To solve the problem, we use linear regression for regression and logistic regression for classification problem. We have to get the best linear or logistic regression formula that fits the datasest. The way to find the formula is the cost function. By..

1. Intuition Regression Example Underfit / High bias : does not fit the training set well Overfit / High variance: Fits the training set extremely well Generalization: Fits training set pretty well Even though overfitting example might have a high accuracy on the training set, it will not have a high accuracy for new test dataset. 2. Addressing overfitting Option 1: Collecting more examples By c..