naive bayes boundary

README.md

@@ -108,6 +108,7 @@ Excerpts from the [Foreword](./docs/foreword_ro.pdf) and [Preface](./docs/prefac
 - [What is Euclidean distance in terms of machine learning?](./faq/euclidean-distance.md)
 - [What is the major difference between naive Bayes and logistic regression?](./faq/naive-bayes-vs-logistic-regression.md)
 - [When should I apply data normalization/standardization?](./faq/when-to-standardize.md)
+- [What is the decision boundary for Naive Bayes?](./faq/naive-bayes-boundary.md)
 - [Which machine learning algorithms can be considered as among the best?](./faq/best-ml-algo.md)
 - [What are the broad categories of classifiers?](./faq/classifier-categories.md)
 

faq/README.md

@@ -51,6 +51,7 @@ Sebastian
 - [What is Euclidean distance in terms of machine learning?](./euclidean-distance.md)
 - [What is the major difference between naive Bayes and logistic regression?](./naive-bayes-vs-logistic-regression.md)
 - [When should I apply data normalization/standardization?](./when-to-standardize.md)
+- [What is the decision boundary for Naive Bayes?](./naive-bayes-boundary.md)
 - [Which machine learning algorithms can be considered as among the best?](./best-ml-algo.md)
 - [What are the broad categories of classifiers?](./classifier-categories.md)
 

faq/naive-bayes-boundary.md

@@ -0,0 +1,13 @@
+# What is the decision boundary for Naive Bayes?
+
+
+It's a (piecewise) quadratic decision boundary for the Gaussian model. The multinomial model has a linear boundary.
+Below, I plotted some examples:
+
+1) UCI Wine Dataset
+
+![](./naive-bayes-boundary/gaussian_1.png)
+
+2) An XOR toy dataset
+
+![](./naive-bayes-boundary/gaussian_2.png)