because obviously if a person has been on the Metro for the last five GPS signals because his GPS signals were just on top of that metro line and his current trip ethical is again on top of that metro line it is quite likely that he is still on that Metro because changing transport modes of transport is actually associated with costs in terms of time effort and maybe even money so our hypothesis was abused the previous movement history to estimate this current mode of transport so again how do we frame this a machine learning