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using POMDPs
import POMDPs: create_state, discount, reward
using POMDPToolbox

type ImageMDP <: MDP{Matrix{Int},Int}
    size::Tuple{Int, Int}
end

create_state(mdp::ImageMDP) = Array(Int, mdp.size[1], mdp.size[2])
discount(::ImageMDP) = 0.9

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import numpy as np

r = np.arange(1.0, 11.0, 0.1)

n = len(r)**3
pts = np.empty((n, 3))
i = 0
for x in r:
    for y in r:
        for z in r:

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AutoViz.jl

A package for rendering simple scenes primarily consisting of cars on roadways using Cairo.

Usage

The main function is

render(scene)

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const Vec2 = SVector{2,Int}
const StateTypes = Union{Vec2, TerminalState}

@with_kw struct SimpleGridWorld <: MDP{StateTypes, Symbol}
    size::Tuple{Int, Int}           = (10,10)
    rewards::Dict{Vec2, Float64}    = Dict(Vec2(4,3)=>-10.0, Vec2(4,6)=>-5.0, Vec2(9,3)=>10.0, Vec2(8,8)=>3.0)
    terminate_in::Set{Vec2}         = Set((Vec2(4,3), Vec2(4,6), Vec2(9,3), Vec2(8,8)))
    tprob::Float64                  = 0.7
    discount::Float64               = 0.95
end

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using POMDPs
using POMDPModelTools
using POMDPSimulators
using POMDPPolicies
using StaticArrays
using Parameters
using Random
using BenchmarkTools
using POMDPModels
using Test

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using POMDPs
using POMDPModelTools

function transition_matrix_a_s_sp(mdp::MDP)
    na = n_actions(mdp)
    ns = n_states(mdp)
    mat = zeros(na, ns, ns) # this should be sparse

    for a in actions(mdp)
        ai = actionindex(mdp, a)

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using ExtendedKalmanFilters
using Distributions
using DelimitedFiles

# We may also want to look at DynamicalSystems.jl
# The package should accept AbstractArrays wherever possible so people can use StaticArrays

# Model semantics
# x_{t+1} = f(x_t, u_t) + w_t
# y_t = h(x_t) + v_t # should the control be an argument of h?

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Here are the two ways that I was referring to about augmenting the state space (these are illustrative rather than efficient or complete implementations):

1. Add a single new terminal state

struct VariableDiscountWrapper1{S, A, F<:Function} <: MDP{Union{S, TerminalState}, A}
    m::MDP{S, A}
    discount::F
end

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The only code in the entire package initially is

abstract type CommonEnv end

function reset! end
function step! end
function actions end

(of course there will be extensive documentation, etc.)

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{
  "name": "MathOptFormat Model",
  "version": {
    "major": 0,
    "minor": 4
  },
  "variables": [
    {
      "name": "x[1,1]"
    },