sdm.md

### Sequential Dependence Model

The Sequential Dependence Model (SDM) re-writes queries to boost terms that appear in sequence or in proximity with one another.
It functions as a `Q→Q` (query re-writing, query-to-query) transformer, and can be used in pipelines as such.

<div class="pipeline">
  <div class="df" title="Query Frame">Q</div>
  <div class="transformer attn" title="SDM Transformer">SDM</div>
  <div class="df" title="Query Frame">Q</div>
</div>