 While deep learning methods have been applied to classification-based approaches, current similarity-based  methods only embody static notions of similarity.
<meaning-changed>  While deep learning methods have been applied to classification-based approaches, current similarity-based  methods only embody static notions of similarity.
 While deep learning methods have been applied to classification-based approaches, current similarity-based applications have been limited, and most similarity-based methods only embody static notions of similarity.