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states.jl
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states.jl
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export State, PositionState
using StaticArrays, NamedTupleTools
import Base: *, +, -, zero, rand, randn, show, promote_rule, rtoldefault,
isapprox, getproperty, real
import LinearAlgebra: norm, promote_leaf_eltypes
abstract type XState{NT <: NamedTuple} <: AbstractState end
"""
`struct State` the main type for states of input variables (particles).
This type is intended only for storing of information but no arithmetic
should be performed on it. For the latter, we have the DState.
"""
struct State{NT <: NamedTuple} <: XState{NT}
x::NT
# standard constructor - SYMS are the same
State{NT}(t::NT1) where {NT <: NamedTuple{SYMS}, NT1 <: NamedTuple{SYMS}} where {SYMS} =
new{NT1}(t)
# if SYMS are not the same we automatically merge them
State{NT}(t::NT1) where {NT <: NamedTuple, NT1 <: NamedTuple} =
State( merge( _x(zero(State{NT})), t ) )
end
"""
`struct DState`: A `State`-like variable but acting like vector with arithmetic
operations defined on it, while `State` acts more like a fixed object that cannot
be manipulated. The main application of `DState` is as a derivative of a
`State`; see also `dstate_type`, ``
"""
struct DState{NT <: NamedTuple} <: XState{NT}
x::NT
# standard constructor - SYMS are the same
DState{NT}(t::NT1) where {NT <: NamedTuple{SYMS}, NT1 <: NamedTuple{SYMS}} where {SYMS} =
new{NT1}(t)
# if SYMS are not the same we automatically merge them
DState{NT}(t::NT1) where {NT <: NamedTuple, NT1 <: NamedTuple} =
DState( merge( _x(zero(DState{NT})), t ) )
DState{NT}(dX::DState) where {NT} = DState{NT}(_x(dX))
end
# the two standard outward facing constructors
State(nt::NT) where {NT <: NamedTuple} = State{NT}(nt)
State(; kwargs...) = State(NamedTuple(kwargs))
# some variations on the above... which might not be needed anymore
State{NT}(; kwargs...) where {NT <: NamedTuple} = State{NT}(NamedTuple(kwargs))
# accessing X.nt and the fields of X.nt
# this relies heavily on constant propagation
_x(X::XState) = getfield(X, :x)
getproperty(X::XState, sym::Symbol) = getproperty(_x(X), sym)
Base.length(::XState) = 1
# ----------- printing / output
const _showdigits = Ref{Int64}(2)
"""
change how many digits are printed in the ACE States
"""
function showdigits!(n::Integer)
_showdigits[] = n
end
_2str(x) = string(x)
_2str(x::AbstractFloat) = "[$(round(x, digits=_showdigits[]))]"
_2str(x::Complex) = "[$(round(x, digits=_showdigits[]))]"
_2str(x::SVector{N, <: AbstractFloat}) where {N} = string(round.(x, digits=_showdigits[]))
_2str(x::SVector{N, <: Complex}) where {N} = string(round.(x, digits=_showdigits[]))[11:end]
_showsym(X::State) = ""
_showsym(X::DState) = "′"
function show(io::IO, X::XState)
_str(sym) = "$(sym):$(ACE._2str(getproperty(ACE._x(X), sym)))"
strs = [ _str(sym) for sym in keys(ACE._x(X)) ]
str = prod(strs[i] * ", " for i = 1:length(strs)-1; init="") * strs[end]
# str = prod( "$(sym):$(_2str(getproperty(_x(X), sym))), "
# for sym in keys(_x(X)) )
print(io, "⟨" * str * "⟩" * _showsym(X))
end
# ----------- some basic manipulations
# extract the symbols and the types
_syms(X::XState) = _syms(typeof(X))
_syms(::Type{<: XState{NamedTuple{SYMS, TT}}}) where {SYMS, TT} = SYMS
_tt(X::XState) = _tt(typeof(X))
_tt(::Type{<: XState{NamedTuple{SYMS, TT}}}) where {SYMS, TT} = TT
_symstt(X::XState) = _symstt(typeof(X))
_symstt(::Type{<: XState{NamedTuple{SYMS, TT}}}) where {SYMS, TT} = SYMS, TT
# which properties are continuous
const CTSTT = Union{AbstractFloat, Complex{<: AbstractFloat},
SVector{N, <: AbstractFloat},
SVector{N, <: Complex}} where {N}
"""
Find the indices of continuous properties, and return the
indices as well as the symbols and types
"""
_findcts(X::TX) where {TX <: XState} = _findcts(TX)
function _findcts(TX::Type{<: XState})
SYMS, TT = _symstt(TX)
icts = findall(T -> T <: CTSTT, TT.types)
end
_ctssyms(X::TX) where {TX <: XState} = _ctssyms(TX)
_ctssyms(TX::Type{<: XState}) = _syms(TX)[_findcts(TX)]
## ----- DState constructors
DState(t::NT) where {NT <: NamedTuple} = DState{NT}(t)
DState(; kwargs...) = DState(NamedTuple(kwargs))
DState(X::TX) where {TX <: State} =
(dstate_type(X))( select(_x(X), _ctssyms(X)) )
"""
convert a State to a corresponding DState
(basically just remove the discrete variables)
"""
dstate_type(X::DState) = typeof(X)
@generated function dstate_type(X::TX) where {TX <: State}
CSYMS = _ctssyms(TX)
quote
typeof( DState( select(_x(X), $CSYMS) ) )
end
end
# ------------ type promotion
@generated function promote_rule(::Type{TDX}, ::Type{S}
) where {TDX <: DState, S <: Number}
SYMS, TT = _symstt(TDX)
PTT = [ _mypromrl(S, TT.types[i]) for i = 1:length(SYMS) ]
PTTstr = "Tuple{" * "$(tuple(PTT...))"[2:end-1] * "}"
quote
$(Meta.parse( "DState{NamedTuple{$(SYMS), $PTTstr}}" ))
end
end
@generated function promote_rule(::Type{TDX1}, ::Type{TDX2}
) where {TDX1 <: DState, TDX2 <: DState}
SYMS1, TT1 = _symstt(TDX1)
SYMS2, TT2 = _symstt(TDX2)
SYMS = tuple(sort([union(SYMS1, SYMS2)...])...)
PTT = []
for sym in SYMS
if sym in SYMS1 && !(sym in SYMS2)
push!(PTT, TT1.types[findfirst(isequal(sym), SYMS1)])
elseif !(sym in SYMS1) && sym in SYMS2
push!(PTT, TT2.types[findfirst(isequal(sym), SYMS2)])
else
T1 = TT1.types[findfirst(isequal(sym), SYMS1)]
T2 = TT2.types[findfirst(isequal(sym), SYMS2)]
push!(PTT, _mypromrl(T1, T2))
end
end
PTTstr = "Tuple{" * "$(tuple(PTT...))"[2:end-1] * "}"
NTTex = Meta.parse("NamedTuple{$SYMS, $PTTstr}")
quote
return DState{$NTTex}
end
end
@generated function dstate_type(X::TX) where {TX <: State}
CSYMS = _ctssyms(TX)
quote
typeof( DState( select(_x(X), $CSYMS) ) )
end
end
# -------------------
# the next variant of dstate_type is used to potentially extend
# from real states to complex dstates.
_mypromrl(T::Type{<: Number}, S::Type{<: Number}) =
promote_type(T, S)
_mypromrl(T::Type{<: Number}, ::Type{<: SVector{N, P}}) where {N, P} =
SVector{N, promote_type(T, P)}
_mypromrl(::Type{<: SVector{N, P}}, T::Type{<: Number}) where {N, P} =
promote_type(T, P)
_mypromrl(T::Type{<: SVector{N, P1}}, ::Type{<: SVector{N, P2}}) where {N, P1, P2} =
SVector{N, promote_type(P1, P2)}
@generated function dstate_type(x::S, X::TX) where {S, TX <: XState}
SYMS, TT = _symstt(TX)
icts = _findcts(TX)
CSYMS = SYMS[icts]
CTT = [ _mypromrl(S, TT.types[i]) for i in icts ]
CTTstr = "Tuple{" * "$(tuple(CTT...))"[2:end-1] * "}"
quote
$(Meta.parse( "DState{NamedTuple{$(CSYMS), $CTTstr}}" ))
end
end
dstate_type(S::Type, X::XState) = dstate_type(zero(S), X)
## ---------- explicit real/complex conversion
# this feels a bit like a hack but might be unavoidable;
# real, complex goes to _ace_real, _ace_complex, which is then applied
# in only slightly non-standard fashion recursively to the states
for f in (:real, :imag, :complex, )
face = Symbol("_ace_$f")
eval(quote
import Base: $f
$face(x::Number) = $f(x)
$face(x::StaticArrays.StaticArray) = $f.(x)
function $f(X::TDX) where {TDX <: DState}
SYMS = _syms(TDX)
vals = ntuple(i -> $face(getproperty(X, SYMS[i])), length(SYMS))
return TDX( NamedTuple{SYMS}(vals) )
end
end)
end
for f in (:real, :complex, )
face = Symbol("_ace_$f")
eval(quote
$f(TDX::Type{<: DState}) = typeof( $f(zero(TDX)) )
# import Base: $f
# $face(x::Type{<: Number}) = $f(x)
# $face(x::SVector{N, T}) where {N, T} = SVector{N, $f(T)}
# function $f(TDX::Type{<: DState})
# SYMS, TT = _symstt(TDX)
# TT1 = ntuple(i -> $face(TT[i]), length(SYMS))
# vals = zero.(TT1)
# return typeof(TDX( NamedTuple{SYMS}(vals) )
# end
end)
end
for f in (:rand, :randn, :zero)
face = Symbol("_ace_$f")
eval( quote
import Base: $f
$face(T::Type) = $f(T)
$face(x::Union{Number, AbstractArray}) = $f(typeof(x))
function $f(x::Union{TX, Type{TX}}) where {TX <: XState}
SYMS, TT = _symstt(x)
vals = ntuple(i -> $face(TT.types[i]), length(SYMS))
return TX( NamedTuple{SYMS}( vals ) )
end
end )
end
# an extra for symbols, this is a bit questionable; why do we even need it?
_ace_zero(::Union{Symbol, Type{Symbol}}) = :O
## ----------- Some arithmetic operations
# binary operations
import Base: +, -
# for f in (:+, :-, )
# eval( quote
# function $f(X1::TX1, X2::TX2) where {TX1 <: XState, TX2 <: XState}
# SYMS = _syms(TX1)
# @assert SYMS == _syms(TX2)
# vals = ntuple( i -> $f( getproperty(_x(X1), SYMS[i]),
# getproperty(_x(X2), SYMS[i]) ), length(SYMS) )
# return TX1( NamedTuple{SYMS}(vals) )
# end
# end )
# end
for f in (:+, :-, )
eval( quote
function $f(X1::TX1, X2::TX2) where {TX1 <: XState, TX2 <: XState}
SYMS1 = ACE._syms(TX1)
@assert issubset(ACE._syms(TX2), SYMS1)
vals = ntuple( i -> begin
sym = SYMS1[i]
v1 = getproperty(ACE._x(X1), sym)
haskey(ACE._x(X2), sym) ? $f(v1, getproperty(ACE._x(X2), sym)) : v1
end, length(SYMS1))
return TX1( NamedTuple{SYMS1}(vals) )
end
end )
end
# multiplication with a scalar
function *(X1::TX, a::Number) where {TX <: XState}
SYMS = _syms(TX)
vals = ntuple( i -> *( getproperty(_x(X1), SYMS[i]), a ), length(SYMS) )
return TX( NamedTuple{SYMS}(vals) )
end
*(a::Number, X1::XState) = *(X1, a)
*(aa::SVector{N, <: Number}, X1::XState) where {N} = aa .* Ref(X1)
promote_rule(::Type{SVector{N, T}}, ::Type{TX}) where {N, T <: Number, TX <: XState} =
SVector{N, promote_type(T, TX)}
# unary
import Base: -
for f in (:-, )
eval(quote
function $f(X::TX) where {TX <: XState}
SYMS = _syms(TX)
vals = ntuple( i -> $f( getproperty(_x(X), SYMS[i]) ), length(SYMS) )
return TX( NamedTuple{SYMS}(vals) )
end
end)
end
# reduction to scalar
import LinearAlgebra: dot
import Base: isapprox
for (f, g) in ( (:dot, :sum), (:isapprox, :all) ) # (:contract, :sum),
eval( quote
function $f(X1::TX1, X2::TX2) where {TX1 <: XState, TX2 <: XState}
SYMS = _syms(TX1)
@assert SYMS == _syms(TX2)
return $g( $f( getproperty(_x(X1), sym),
getproperty(_x(X2), sym) ) for sym in SYMS)
end
end )
end
@generated function contract(X1::TX1, X2::TX2) where {TX1 <: XState, TX2 <: XState}
# this line is important - it means that missing symbols are interpreted as zero
SYMS = intersect(_syms(TX1), _syms(TX2))
code = "contract(X1.$(SYMS[1]), X2.$(SYMS[1]))"
for sym in SYMS[2:end]
code *= " + contract(X1.$sym, X2.$sym)"
end
return quote
$(Meta.parse(code))
end
end
contract(X1::Number, X2::XState) = X1 * X2
contract(X2::XState, X1::Number) = X1 * X2
import LinearAlgebra: norm
for (f, g) in ((:norm, :norm), (:sumsq, :sum), (:normsq, :sum) )
eval( quote
function $f(X::TX) where {TX <: XState}
SYMS = _syms(TX)
vals = ntuple( i -> $f( getproperty(_x(X), SYMS[i]) ), length(SYMS))
return $g(vals)
end
end )
end
## -------- not clear where needed; or deleted functionality
function promote_leaf_eltypes(X::TX) where {TX <: XState}
SYMS = _syms(TX)
promote_type( ntuple(i -> promote_leaf_eltypes(getproperty(_x(X), SYMS[i])), length(SYMS))... )
end
## ----- Implementation of a Position State, as a basic example
PositionState{T} = State{NamedTuple{(:rr,), Tuple{SVector{3, T}}}}
PositionState(r::AbstractVector{T}) where {T <: AbstractFloat} =
(@assert length(r) == 3; PositionState{T}(; rr = SVector{3, T}(r)))
promote_rule(::Union{Type{S}, Type{PositionState{S}}},
::Type{PositionState{T}}) where {S, T} =
PositionState{promote_type(S, T)}
# some special functionality for PositionState, mostly needed for testing
*(A::AbstractMatrix, X::TX) where {TX <: PositionState} = TX( (rr = A * X.rr,) )
+(X::TX, u::StaticVector{3}) where {TX <: PositionState} = TX( (rr = X.rr + u,) )
# ------------------ Basic Configurations Code
# TODO: get rid of this?
import ACEbase: AbstractConfiguration
export ACEConfig
"""
`struct ACEConfig`: The canonical implementation of an `AbstractConfiguration`.
Just wraps a `Vector{<: AbstractState}`
"""
struct ACEConfig{STT} <: AbstractConfiguration
Xs::Vector{STT} # list of states
end
Base.eltype(cfg::ACEConfig) = eltype(cfg.Xs)
Base.iterate(cfg::ACEConfig, args...) = iterate(cfg.Xs, args...)
Base.length(cfg::ACEConfig) = length(cfg.Xs)
# ---------------- AD code
# TODO: check whether this is still needed
# this function makes sure that gradients w.r.t. a State become a DState
function rrule(::typeof(getproperty), X::XState, sym::Symbol)
val = getproperty(X, sym)
return val, w -> ( NoTangent(),
dstate_type(w[1], X)( NamedTuple{(sym,)}((w,)) ),
NoTangent() )
end
const UConfig = Union{ACEConfig, AbstractVector{<: AbstractState}}