After examining an area, Planner (PL) determines: 1) whether to terminate the generation process; 2) which writer should generate the next sentence.
besides the shared Global State Encoder (GSE), the rest part of PL is modeled by a two-layer feed-forward network: where W 1 , W 2 , and W 3 are parameter matrices; idx n ∈ {0, 1, 2} denotes the indicator, where 0 is for STOP, 1 for NW and 2 for AW.