1. A method of processing data, the data comprising: a set of one or more system inputs, and a set of one or more system outputs, wherein each system output corresponds to a respective system input, each system input includes a plurality of data points, a first data point in the plurality and a second data point in the plurality being from a same raw data source, and the first data point being pre-processed using a first pre-processing function that is different from a second pre-processing function used to pre-process the second data point, the method comprising: for each of the first and second data points, calculating, by a computer processor, a value indicative of a relative contribution of each of the first and second pre-processing functions to the system output that corresponds to the first and second data points; wherein the calculating of the value includes performing a machine learning algorithm on the first and second data points.