I'm sure a number of people who have contributed to Torch are working at DeepMind. However, Torch has been around for much longer than DeepMind (about 12 years at this point). Two of the major contributors to Torch, Ronan Collobert and Clement Farabet, were never DeepMind employees.
To be fair, another major contributor to Torch is a co-author of this paper (Kavukcuoglu).
