10 things I didn’t know about Data Science a year ago

In my article My personal road map for learning data science in 2018 I wrote about how I try to tackle the data science knowledge sphere. Due to the fact that 2018 is slowly coming to an end I think it is time for a little wrap up.

What are the things I learned about Data Science in 2018? Here we go:

1. The difference between Data Science, Machine Learning, Deep Learning and AI

Continue reading “10 things I didn’t know about Data Science a year ago”

Classification: Precision and Recall

In the realms of Data Science you’ll encounter sooner or the later the terms “Precision” and “Recall”. But what do they mean?

Clarification

Living together with little kids You very often run into classification issues:

My daughter really likes dogs, so seeing a dog is something positive. When she sees a normal dog e.g. a Labrador and proclaims: “Look, there is a dog!”

That’s a True Positive (TP) Continue reading “Classification: Precision and Recall”

Data Science Datasets: Iris flower data set

The Iris flower data set or Fisher’s Iris data set became a typical test case for many statistical classification techniques in machine learning such as support vector machines.

It is sometimes called Anderson’s Iris data set because Edgar Anderson collected the data to quantify the morphological variation of Iris flowers of three related species.

This data set can be imported from scikit-learn like the following:

from sklearn import datasets

iris = datasets.load_iris()
iris.data.shape, iris.target.shape

Data Science Overview

Data Science tries to answer one of the following questions:

  • Classification -> “Is it A or B?”
  • Clustering -> “Are there groups which belong together?”
  • Regression -> “How will it develop in the future?”
  • Association -> “What is happening very often together?”

There are two ways to tackle these problem domains with machine learning:

  1. Supervised Learning
  2. Unsupervised Learning

Supervised Learning

You have training and test data with labels. Labels tell You to which e.g. class a certain data item belongs. Image you have images of pets and the labels are the name of the pets.

Unsupervised Learning

Your data doesn’t have labels. Your algorithm e.g. k-means clustering need to figure out a structure given only the data

My personal road map for learning data science in 2018

I got confused by all the buzzwords: data science, machine learning, deep learning, neural nets, artificial intelligence, big data, and so on and so on.

As an engineer I like to put some structure to the chaos. Inspired by Roadmap: How to Learn Machine Learning in 6 Months and Tetiana Ivanova – How to become a Data Scientist in 6 months a hacker’s approach to career planning I build my own learning road map for this year: Continue reading “My personal road map for learning data science in 2018”