Update app.py

app.py

@@ -74,6 +74,8 @@ For machines to learn this function, they need two things:
 - **Data** (data contains x and y where x are feature variables and y is class variable)
 - **Algorithms** (used to capture the relationships between x and y)
 
+<u><b>NOTE:</b></u> The data given to the machine learning model should be **structured**, if not then needs to be be converted to structured format.
+
 Machine Learning can be categorized into:
 1. Supervised Learning  
 2. Unsupervised Learning