|
| 1 | +export MultiThreadEnv |
| 2 | + |
| 3 | +using Base.Threads:@spawn |
| 4 | + |
| 5 | +""" |
| 6 | + MultiThreadEnv(envs::Vector{<:AbstractEnv}) |
| 7 | +
|
| 8 | +Wrap multiple instances of the same environment type into one environment. |
| 9 | +Each environment will run in parallel by leveraging `Threads.@spawn`. |
| 10 | +So remember to set the environment variable `JULIA_NUM_THREADS`! |
| 11 | +""" |
| 12 | +struct MultiThreadEnv{E,S,R,AS,SS,L} <: AbstractEnv |
| 13 | + envs::Vector{E} |
| 14 | + states::S |
| 15 | + rewards::R |
| 16 | + terminals::BitArray{1} |
| 17 | + action_space::AS |
| 18 | + state_space::SS |
| 19 | + legal_action_space_mask::L |
| 20 | +end |
| 21 | + |
| 22 | +function Base.show(io::IO, t::MIME"text/markdown", env::MultiThreadEnv) |
| 23 | + s = """ |
| 24 | + # MultiThreadEnv($(length(env)) x $(nameof(env[1]))) |
| 25 | + """ |
| 26 | + show(io, t, Markdown.parse(s)) |
| 27 | +end |
| 28 | + |
| 29 | +""" |
| 30 | + MultiThreadEnv(f, n::Int) |
| 31 | +
|
| 32 | +`f` is a lambda function which creates an `AbstractEnv` by calling `f()`. |
| 33 | +""" |
| 34 | +MultiThreadEnv(f, n::Int) = MultiThreadEnv([f() for _ in 1:n]) |
| 35 | + |
| 36 | +function MultiThreadEnv(envs::Vector{<:AbstractEnv}) |
| 37 | + n = length(envs) |
| 38 | + S = state_space(envs[1]) |
| 39 | + s = state(envs[1]) |
| 40 | + if S isa Space |
| 41 | + S_batch = similar(S, size(S)..., n) |
| 42 | + s_batch = similar(s, size(s)..., n) |
| 43 | + for j in 1:n |
| 44 | + Sₙ = state_space(envs[j]) |
| 45 | + sₙ = state(envs[j]) |
| 46 | + for i in CartesianIndices(size(S)) |
| 47 | + S_batch[i, j] = Sₙ[i] |
| 48 | + s_batch[i, j] = sₙ[i] |
| 49 | + end |
| 50 | + end |
| 51 | + else |
| 52 | + S_batch = Space(state_space.(envs)) |
| 53 | + s_batch = state.(envs) |
| 54 | + end |
| 55 | + |
| 56 | + A = action_space(envs[1]) |
| 57 | + if A isa Space |
| 58 | + A_batch = similar(A, size(A)..., n) |
| 59 | + for j in 1:n |
| 60 | + Aⱼ = action_space(envs[j]) |
| 61 | + for i in CartesianIndices(size(A)) |
| 62 | + A_batch[i, j] = Aⱼ[i] |
| 63 | + end |
| 64 | + end |
| 65 | + else |
| 66 | + A_batch = Space(action_space.(envs)) |
| 67 | + end |
| 68 | + |
| 69 | + r_batch = reward.(envs) |
| 70 | + t_batch = is_terminated.(envs) |
| 71 | + if ActionStyle(envs[1]) === FULL_ACTION_SET |
| 72 | + m_batch = BitArray(undef, size(A_batch)) |
| 73 | + for j in 1:n |
| 74 | + L = legal_action_space_mask(envs[j]) |
| 75 | + for i in CartesianIndices(size(A)) |
| 76 | + m_batch[i, j] = L[i] |
| 77 | + end |
| 78 | + end |
| 79 | + else |
| 80 | + m_batch = nothing |
| 81 | + end |
| 82 | + MultiThreadEnv(envs, s_batch, r_batch, t_batch, A_batch, S_batch, m_batch) |
| 83 | +end |
| 84 | + |
| 85 | +MacroTools.@forward MultiThreadEnv.envs Base.getindex, Base.length, Base.iterate |
| 86 | + |
| 87 | +function (env::MultiThreadEnv)(actions) |
| 88 | + @sync for i in 1:length(env) |
| 89 | + @spawn begin |
| 90 | + env[i](actions[i]) |
| 91 | + end |
| 92 | + end |
| 93 | +end |
| 94 | + |
| 95 | +function RLBase.reset!(env::MultiThreadEnv; is_force = false) |
| 96 | + if is_force |
| 97 | + for i in 1:length(env) |
| 98 | + reset!(env[i]) |
| 99 | + end |
| 100 | + else |
| 101 | + @sync for i in 1:length(env) |
| 102 | + if is_terminated(env[i]) |
| 103 | + @spawn begin |
| 104 | + reset!(env[i]) |
| 105 | + end |
| 106 | + end |
| 107 | + end |
| 108 | + end |
| 109 | +end |
| 110 | + |
| 111 | +const MULTI_THREAD_ENV_CACHE = IdDict{AbstractEnv,Dict{Symbol,Array}}() |
| 112 | + |
| 113 | +function RLBase.state(env::MultiThreadEnv) |
| 114 | + N = ndims(env.states) |
| 115 | + @sync for i in 1:length(env) |
| 116 | + @spawn selectdim(env.states, N, i) .= state(env[i]) |
| 117 | + end |
| 118 | + env.states |
| 119 | +end |
| 120 | + |
| 121 | +function RLBase.reward(env::MultiThreadEnv) |
| 122 | + env.rewards .= reward.(env.envs) |
| 123 | + env.rewards |
| 124 | +end |
| 125 | + |
| 126 | +function RLBase.is_terminated(env::MultiThreadEnv) |
| 127 | + env.terminals .= is_terminated.(env.envs) |
| 128 | + env.terminals |
| 129 | +end |
| 130 | + |
| 131 | +function RLBase.legal_action_space_mask(env::MultiThreadEnv) |
| 132 | + @sync for i in 1:length(env) |
| 133 | + @spawn selectdim(env.legal_action_space_mask, N, i) .= |
| 134 | + legal_action_space_mask(env[i]) |
| 135 | + end |
| 136 | + env.legal_action_space_mask |
| 137 | +end |
| 138 | + |
| 139 | +RLBase.action_space(env::MultiThreadEnv) = env.action_space |
| 140 | +RLBase.state_space(env::MultiThreadEnv) = env.state_space |
| 141 | +RLBase.legal_action_space(env::MultiThreadEnv) = Space(legal_action_space.(env.envs)) |
| 142 | +# RLBase.current_player(env::MultiThreadEnv) = current_player.(env.envs) |
| 143 | + |
| 144 | +for f in RLBase.ENV_API |
| 145 | + if endswith(String(f), "Style") |
| 146 | + @eval RLBase.$f(x::MultiThreadEnv) = $f(x[1]) |
| 147 | + end |
| 148 | +end |
0 commit comments