Pretty much what czinck said. Python is much more popular in general, which makes it more likely to be popular in any specific subfield, for various reasons:

Pretty much what czinck said. Python is much more popular in general, which makes it more likely to be popular in any specific subfield, for various reasons: 1. More chance that people who decide to do anything in ML already use Python. 2. There's better existing support for various ML-related tasks in Python. 3. There's a larger audience available for ML-related things in Python, therefore people think it's more worthwhile to code things in it. etc.