Helper functions

comma_join(sequence)	Helper function to combine a list into a human-readable expression with commas and a final "and" separator
make_safe(element)	Helper function to make an element a string
make_scp_safe(string)	Helper function to make a string safe for saving in Kaldi scp files.
load_scp(path[, data_type])	Load a Kaldi script file (.scp)
load_scp_safe(string)	Helper function to load previously made safe text.
score_wer(gold, hypo[, filter_brackets])	Computes word error rate and character error rate for a transcription
edit_distance(x, y)	Compute edit distance between two sets of labels
output_mapping(mapping, path[, skip_safe])	Helper function to save mapping information (i.e., utt2spk) in Kaldi scp format