Which language is use in maachine learning and why?

Answer 1

Python, for its universality and great multitude of handy, free open-source libraries.

Answer 2

python is standard for deep learning and AI in general.

Answer 3

The core of a lot of machine learning libraries are written in high performance/lower level languages such C, C++, and with CUDA or the equivalent. Many of the libraries are bounded/wrapped for higher level languages such as Python for simplicity and appealing to a bigger crowd. (Data scientists for example.)