Calculus is an important mathematics technique behind many machine learning algorithms. You don’t always need to know it to use the algorithms. When you go deeper, you will see it is ubiquitous in every discussion on the theory behind a machine learning model.
As a practitioner, we are most likely not going to encounter very hard calculus problems. If we need to do one, there are tools such as computer algebra systems to help, or at least, verify our solution. However, what is more important is understanding the idea behind calculus and relating the calculus terms to its use in our machine learning algorithms.
