RDR2: Routing over Document Structure

① a tree, no traversal→② score-based, both ways→③ LLM-guided instead→④ traversal learned→⑤ multimodal
Retrieve top-k DocumentRoute Read one document at a time, in a loop the document tree as it stands now 0: =Wonder Woman in other media= 2: ==Live action== 3: ===Theatrical releases=== 4: Gal Gadot portrays Diana… 5: ===Television=== 8: ==Animation== 10: ==Video games== every heading is always there · only passages open and close open now: the passage retrieval landed on, plus its siblings ▸ collapsed heading ▾ opened heading one step of the router ★ the router is the only trained part reads the question + the tree on the left [EXP] 5 open heading 5, close what was open EXPLORE [ANS] 4 take passage 4 out, the tree is untouched HARVEST [REF] −1 not chosen this step — would end this document STOP an action is ⟨tag, node id⟩ · several per step only [EXP] rewrites the tree → only [ANS] writes to the pile below ↓ after [EXP] 5 · the same tree, rewritten 0: =Wonder Woman in other media= 2: ==Live action== 3: ===Theatrical releases=== ← closed 5: ===Television=== ← opened 6: Cathy Lee Crosby portrays… 7: Lynda Carter portrays… 8: ==Animation== 10: ==Video games== identical headings · one window of text swapped for another the tree never grows, so the prompt stays a fixed size kept passages outside the tree what [ANS] pulls out of the tree, step after step — the tree never holds it 4: Gal Gadot portrays… 6, 7 next grows until [REF] Reader one call · q + every pile answer
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