A tensor is not a function in the traditional sense of mathematics. In mathematics, a function typically maps one set of values to another set of values A tensor is a more general mathematical object that can be thought of as a multi-dimensional array of numbers, which can be used to represent a wide variety of mathematical objects, such as scalars, vectors, matrices, and higher-dimensional arrays. In deep learning frameworks such as TensorFlow and PyTorch, you can use tensor operation function that can be applied to tensors, those operation functions are not tensors themselves, but instead are like regular functions that can operate on tensors in various ways like element wise addition, matrix multiplication or applying mathematical operations on tensors.