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

A picture says more than a thousand words.

## 2. The difference between supervised and 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

## 3. The areas of applied machine learning

are described here: The Essence of Machine Learning and Data Science Overview

## 4. Bayes Theorem

In my article Bayes theorem I elaborated about the **base rate fallacy **and in naive bayes I recapped the second lesson from udacity’s UD120 Intro to Machine Learning

## 5. Precision and Recall and ROC

In my article classification: precision and recall I wrote about different useful measures to evaluate the quality of a supervised learning algorithm.

In Receiver Operating Characteristic I wrote about another useful measures the ROC.

## 6. Visualization with matplotlib

Matplotlib is a really good starting point for visualization. I wrote about it in Introduction to matplotlib, Scatterplot with matplotlib

## 7. Math with numpy

I wrote some articles about the usage of numpy but only scraped the surface of this mighty library

## 8. Image manipulation with OpenCV

## 9. JuPyter Notebooks

Sometimes I love them sometimes I hate them. I wrote an Introduction to JuPyter Notebook

## 10. Podcasts

In 2018 I’ve listened to a bunch of great podcasts on iTunes: