 SSNs can share parameters across layers even when they have different sizes , perform different operations , and/or operate on features from different modalities .
<fluency>  SSNs can share parameters across layers even when they have different sizes , perform different operations , and/or operate on features from different modalities .
 SSNs can share parameters across layers even when they have different sizes or perform different operations , and/or operate on features from different modalities .