SLDP: example 2
This tutorial was generated using Literate.jl. Download the source as a .jl file. Download the source as a .ipynb file.
This example is derived from Section 4.3 of the paper: Ahmed, S., Cabral, F. G., & da Costa, B. F. P. (2019). Stochastic Lipschitz Dynamic Programming. Optimization Online. PDF
using SDDP
import HiGHS
import Test
function sldp_example_two(; first_stage_integer::Bool = true, N = 2)
model = SDDP.LinearPolicyGraph(;
stages = 2,
lower_bound = -100.0,
optimizer = HiGHS.Optimizer,
) do sp, t
@variable(sp, 0 <= x[1:2] <= 5, SDDP.State, initial_value = 0.0)
if t == 1
if first_stage_integer
@variable(sp, 0 <= u[1:2] <= 5, Int)
@constraint(sp, [i = 1:2], u[i] == x[i].out)
end
@stageobjective(sp, -1.5 * x[1].out - 4 * x[2].out)
else
@variable(sp, 0 <= y[1:4] <= 1, Bin)
@variable(sp, ω[1:2])
@stageobjective(sp, -16 * y[1] - 19 * y[2] - 23 * y[3] - 28 * y[4])
@constraint(
sp,
2 * y[1] + 3 * y[2] + 4 * y[3] + 5 * y[4] <= ω[1] - x[1].in
)
@constraint(
sp,
6 * y[1] + 1 * y[2] + 3 * y[3] + 2 * y[4] <= ω[2] - x[2].in
)
steps = range(5; stop = 15, length = N)
SDDP.parameterize(sp, [[i, j] for i in steps for j in steps]) do φ
return JuMP.fix.(ω, φ)
end
end
end
if get(ARGS, 1, "") == "--write"
# Run `$ julia sldp_example_two.jl --write` to update the benchmark
# model directory
model_dir = joinpath(@__DIR__, "..", "..", "..", "benchmarks", "models")
SDDP.write_to_file(
model,
joinpath(model_dir, "sldp_example_two_$(N).sof.json.gz");
test_scenarios = 30,
)
return
end
SDDP.train(model; log_frequency = 10)
bound = SDDP.calculate_bound(model)
if N == 2
Test.@test bound <= -57.0
elseif N == 3
Test.@test bound <= -59.33
elseif N == 6
Test.@test bound <= -61.22
end
return
end
sldp_example_two(; N = 2)
sldp_example_two(; N = 3)
sldp_example_two(; N = 6)-------------------------------------------------------------------
SDDP.jl (c) Oscar Dowson and contributors, 2017-24
-------------------------------------------------------------------
problem
nodes : 2
state variables : 2
scenarios : 4.00000e+00
existing cuts : false
options
solver : serial mode
risk measure : SDDP.Expectation()
sampling scheme : SDDP.InSampleMonteCarlo
subproblem structure
VariableRef : [7, 11]
AffExpr in MOI.EqualTo{Float64} : [2, 2]
AffExpr in MOI.LessThan{Float64} : [2, 2]
VariableRef in MOI.GreaterThan{Float64} : [5, 7]
VariableRef in MOI.Integer : [2, 2]
VariableRef in MOI.LessThan{Float64} : [4, 7]
VariableRef in MOI.ZeroOne : [4, 4]
numerical stability report
matrix range [1e+00, 6e+00]
objective range [1e+00, 3e+01]
bounds range [1e+00, 1e+02]
rhs range [0e+00, 0e+00]
-------------------------------------------------------------------
iteration simulation bound time (s) solves pid
-------------------------------------------------------------------
10 -4.000000e+01 -5.809615e+01 3.633690e-02 78 1
20 -9.800000e+01 -5.809615e+01 7.553911e-02 148 1
30 -4.000000e+01 -5.809615e+01 1.234169e-01 226 1
40 -9.800000e+01 -5.809615e+01 1.609950e-01 296 1
-------------------------------------------------------------------
status : simulation_stopping
total time (s) : 1.609950e-01
total solves : 296
best bound : -5.809615e+01
simulation ci : -5.491250e+01 ± 7.414787e+00
numeric issues : 0
-------------------------------------------------------------------
-------------------------------------------------------------------
SDDP.jl (c) Oscar Dowson and contributors, 2017-24
-------------------------------------------------------------------
problem
nodes : 2
state variables : 2
scenarios : 9.00000e+00
existing cuts : false
options
solver : serial mode
risk measure : SDDP.Expectation()
sampling scheme : SDDP.InSampleMonteCarlo
subproblem structure
VariableRef : [7, 11]
AffExpr in MOI.EqualTo{Float64} : [2, 2]
AffExpr in MOI.LessThan{Float64} : [2, 2]
VariableRef in MOI.GreaterThan{Float64} : [5, 7]
VariableRef in MOI.Integer : [2, 2]
VariableRef in MOI.LessThan{Float64} : [4, 7]
VariableRef in MOI.ZeroOne : [4, 4]
numerical stability report
matrix range [1e+00, 6e+00]
objective range [1e+00, 3e+01]
bounds range [1e+00, 1e+02]
rhs range [0e+00, 0e+00]
-------------------------------------------------------------------
iteration simulation bound time (s) solves pid
-------------------------------------------------------------------
10 -7.500000e+01 -6.196125e+01 4.547787e-02 138 1
20 -4.700000e+01 -6.196125e+01 8.605599e-02 258 1
30 -7.500000e+01 -6.196125e+01 1.360030e-01 396 1
40 -4.000000e+01 -6.196125e+01 1.728370e-01 516 1
-------------------------------------------------------------------
status : simulation_stopping
total time (s) : 1.728370e-01
total solves : 516
best bound : -6.196125e+01
simulation ci : -5.653750e+01 ± 6.969810e+00
numeric issues : 0
-------------------------------------------------------------------
-------------------------------------------------------------------
SDDP.jl (c) Oscar Dowson and contributors, 2017-24
-------------------------------------------------------------------
problem
nodes : 2
state variables : 2
scenarios : 3.60000e+01
existing cuts : false
options
solver : serial mode
risk measure : SDDP.Expectation()
sampling scheme : SDDP.InSampleMonteCarlo
subproblem structure
VariableRef : [7, 11]
AffExpr in MOI.EqualTo{Float64} : [2, 2]
AffExpr in MOI.LessThan{Float64} : [2, 2]
VariableRef in MOI.GreaterThan{Float64} : [5, 7]
VariableRef in MOI.Integer : [2, 2]
VariableRef in MOI.LessThan{Float64} : [4, 7]
VariableRef in MOI.ZeroOne : [4, 4]
numerical stability report
matrix range [1e+00, 6e+00]
objective range [1e+00, 3e+01]
bounds range [1e+00, 1e+02]
rhs range [0e+00, 0e+00]
-------------------------------------------------------------------
iteration simulation bound time (s) solves pid
-------------------------------------------------------------------
10 -8.200000e+01 -6.546793e+01 7.888699e-02 462 1
20 -6.300000e+01 -6.546793e+01 1.393149e-01 852 1
30 -5.900000e+01 -6.546793e+01 2.550819e-01 1314 1
40 -4.700000e+01 -6.546793e+01 3.169050e-01 1704 1
-------------------------------------------------------------------
status : simulation_stopping
total time (s) : 3.169050e-01
total solves : 1704
best bound : -6.546793e+01
simulation ci : -5.921250e+01 ± 4.416680e+00
numeric issues : 0
-------------------------------------------------------------------