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src/type.jl

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+module type
+  
+export MCTSNode
+
+# ---------------------------------------------- 100 --------------------------------------------- #
+
+
+""" a node for MCTS search tree
+
+# Arguments
+  - `state::T`
+    a state of a game. Can be a Dict or something else. 
+  - `visits::Integer `
+    number of time the game visits this state
+  - `stateValue::Float64`
+    state value
+  - `children::Dict{T, MCTSNode}`
+    children node
+
+# Return
+  - `nothing`
+# Example
+```jldoctest
+julia> state = Dict(
+        :info=> Dict(),           # keyword info
+        :thoughtHistory=> Dict(
+          :question=> _,
+          :thought_1=> _, 
+          :action_1=> _, 
+          :observation_1=> _, 
+          :thought_2=> _,
+          ...
+          )  
+        )
+```
+
+# TODO
+  [] update docstring
+
+# Signature
+"""
+mutable struct MCTSNode{T1<:AbstractDict, T2<:AbstractString}
+  nodekey::T2
+  state::T1
+  visits::Integer
+  progressvalue::Number # estimate value by LLM's reasoning
+  statevalue::Number  # store discounted commulative reward (gather from its child node)
+  reward::Number  # this node's own reward
+  isterminal::Bool
+  parent::Union{MCTSNode, Nothing} 
+  children::Dict{String, MCTSNode}
+end
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+end # module type