Book Image

Codeless Time Series Analysis with KNIME

By : KNIME AG, Corey Weisinger, Maarit Widmann, Daniele Tonini
Book Image

Codeless Time Series Analysis with KNIME

By: KNIME AG, Corey Weisinger, Maarit Widmann, Daniele Tonini

Overview of this book

This book will take you on a practical journey, teaching you how to implement solutions for many use cases involving time series analysis techniques. This learning journey is organized in a crescendo of difficulty, starting from the easiest yet effective techniques applied to weather forecasting, then introducing ARIMA and its variations, moving on to machine learning for audio signal classification, training deep learning architectures to predict glucose levels and electrical energy demand, and ending with an approach to anomaly detection in IoT. There’s no time series analysis book without a solution for stock price predictions and you’ll find this use case at the end of the book, together with a few more demand prediction use cases that rely on the integration of KNIME Analytics Platform and other external tools. By the end of this time series book, you’ll have learned about popular time series analysis techniques and algorithms, KNIME Analytics Platform, its time series extension, and how to apply both to common use cases.
Table of Contents (20 chapters)
1
Part 1: Time Series Basics and KNIME Analytics Platform
7
Part 2: Building and Deploying a Forecasting Model
14
Part 3: Forecasting on Mixed Platforms

Training a Gradient Boosted Forest

To classify the four different audio signals so that we can tell them apart, we’ll need to do more than just apply the Fourier transform; we need to build a model on our cross-sectional data. Training a Gradient Boosted Forest in KNIME is very easy. We’ll use the Gradient Boosted Trees Learner node, which only has a few configurable options that we’ll concern ourselves with. We’ve chosen to use the Gradient Boosted Forest model due to its ability to handle high-dimensional data and its impressive predictive power.

Applying the Fourier transform in KNIME

The workflow we’ll use to train the model and do all of our preprocessing with the Fourier transform can be seen in Figure 8.11. You’ll notice it is a small workflow with some of the binning logic placed inside the FFT and Binning component.

Figure 8.11 – Training workflow with FFT preprocessing

When constructing this...