TensorNetwork is an open source python package for tensor network computations. It has been designed with the goal in mind to help researchers and engineers with rapid development of highly efficient tensor network algorithms for physics and machine learning applications. After a brief introduction to tensor networks, I will discuss some of the main design principles of the TensorNetwork package, and show how one can use it to speed up tensor network algorithms by running them on accelerated hardware, or by exploiting tensor sparsity.