title: Sequence length retaining dynamic time warping
body: <p>Let's say we have two sequences of equal length which we want to align with Dynamic Time Warping (DTW). Ordinary DTW implementations create alignments that can be longer than the original sequence(s). I'm looking for an implementation of DTW that takes two equal length sequences as an input and produces an alignment that is the same length as the inputs. Does such implementation exist or would some other technique be more suitable for this problem?</p>