title: sklearn test train split - get index to filename of original list
body: <p>I am using the <code>test_train_split</code> module in <code>sklearn</code> to generate a random combination of dataset for training and testing. I have a list of filepaths that point to the original dataset. I would also like to know how the data has been shuffled, or shuffle the filepath list in the same manner so as to be able to trace the filepaths once the shuffled/split dataset is made available?</p>