1. Financial Computing and Analytics Group, Department of Computer Science, University College London, Gower Street, London, WC1E 6BT, UK
2. Dipartimento di Matematica, Politecnico di Milano, Via E. Bonardi 9, 20133 Milano, Italy
3. Systemic Risk Centre, London School of Economics and Political Science London, Houghton Street, London WC2A 2AE, UK