2. The computer-implemented method of claim 1 , further comprising: forming token sequences from the matching tokens as segments of the positive instances; and for each of the token sequences, calculating weights of their matching the file, and storing the token sequences and their weights in the token base.
1. A computer-implemented method for normalizing non-numeric features of files, comprising: segmenting at least one pair of positive instances of a non-numeric feature of a file into a number of tokens, wherein the non-numeric feature of the file comprises a file storage path of a configuration file stored in a networked computer environment; comparing the tokens in the at least one pair of positive instances to obtain matching tokens by: calculating the maximum matching score between each token in a positive instance with the tokens in another positive instance; selecting the tokens of which the maximum matching scores are greater than a given threshold, to get the matching tokens; and for each of the matching tokens, calculating weights of their matching the file, and storing the tokens and their weights in a token base, wherein the matching tokens identify similar configuration files stored in different locations in the networked computer environment.