Book Image

Machine Learning Solutions

Book Image

Machine Learning Solutions

Overview of this book

Machine learning (ML) helps you find hidden insights from your data without the need for explicit programming. This book is your key to solving any kind of ML problem you might come across in your job. You’ll encounter a set of simple to complex problems while building ML models, and you'll not only resolve these problems, but you’ll also learn how to build projects based on each problem, with a practical approach and easy-to-follow examples. The book includes a wide range of applications: from analytics and NLP, to computer vision domains. Some of the applications you will be working on include stock price prediction, a recommendation engine, building a chat-bot, a facial expression recognition system, and many more. The problem examples we cover include identifying the right algorithm for your dataset and use cases, creating and labeling datasets, getting enough clean data to carry out processing, identifying outliers, overftting datasets, hyperparameter tuning, and more. Here, you'll also learn to make more timely and accurate predictions. In addition, you'll deal with more advanced use cases, such as building a gaming bot, building an extractive summarization tool for medical documents, and you'll also tackle the problems faced while building an ML model. By the end of this book, you'll be able to fine-tune your models as per your needs to deliver maximum productivity.
Table of Contents (19 chapters)
Machine Learning Solutions
Foreword
Contributors
Preface
Index

Feature engineering


As discussed earlier, we want to predict the close price for the DJIA index for a particular trading day. In this section, we will do feature selection based on our intuition for our basic prediction model for stock prices. We have already generated the training dataset. So, now we will load the saved .pkl format dataset and perform feature selection as well as minor data processing. We will also generate the sentiment score for each of the filtered NYTimes news articles and will use this sentiment score to train our baseline model. We will use the following Python dependencies:

  • numpy

  • pandas

  • nltk

This section has the following steps:

  1. Loading the dataset

  2. Minor preprocessing

  3. Feature selection

  4. Sentiment analysis

So, let's begin coding!

Loading the dataset

We have saved the data in the pickle format, and now we need to load data from it. You can refer to the following code snippet:

Figure 2.16: Code snippet for loading the dataset from the pickle file

You can refer to the code by clicking...