On a high level, Machine Learning is the union of statistics and computation. The crux of machine learning revolves around the concept of algorithms or models which are in fact statistical estimations on steroids. The Ultimate Guide to Evaluation and Selection of Models in Machine Learning - neptune.ai
On a high level, Machine Learning is the union of statistics and computation. The crux of machine learning revolves around the concept of algorithms or models which are in fact statistical estimations on steroids.
However, any given model has several limitations depending on the data distribution. None of them can be entirely accurate since they are just estimations (even if on steroids). These limitations are popularly known by the name of bias and variance.
A model with high bias will oversimplify by not paying much attention to the training points (e.g.: In Linear Regression, irrespective of data distribution, the model will always assume a linear relationship).
A model with high variance will restrict itself to the training data by not generalizing for test points that it hasn’t seen before (e.g.: Random Forest with max_depth = None).
The issue arises when the limitations are subtle, like when we have to choose between a random forest algorithm and a gradient boosting algorithm or between two variations of the same decision tree algorithm. Both will tend to have high variance and low bias.
This is where model selection and model evaluation come into play!
In this article we’ll talk about:
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Machine learning is quite an exciting field to study and rightly so. It is all around us in this modern world. From Facebook’s feed to Google Maps for navigation, machine learning finds its application in almost every aspect of our lives. It is quite frightening and interesting to think of how our lives would have been without the use of machine learning. That is why it becomes quite important to understand what is machine learning, its applications and importance.