1. A method of sensing a downhole parameter in a well, the method comprising the steps of: obtaining multiple training data sets including corresponding outputs of at least one temporary sensor in the well and outputs of at least one permanent sensor at the earth's surface, the temporary sensor sensing the parameter downhole and the permanent sensor sensing the parameter at the surface; and training a neural network to output the permanent sensor outputs of the training data sets in response to input to the neural network of the corresponding temporary sensor outputs of the training data sets.