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learning_curves.jl
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learning_curves.jl
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## LEARNING CURVES
"""
curve = learning_curve(mach; resolution=30,
resampling=Holdout(),
repeats=1,
measure=rms,
weights=nothing,
operation=predict,
range=nothing,
acceleration=default_resource(),
acceleration_grid=CPU1(),
rngs=nothing,
rng_name=nothing)
Given a supervised machine `mach`, returns a named tuple of objects
suitable for generating a plot of performance estimates, as a function
of the single hyperparameter specified in `range`. The tuple `curve`
has the following keys: `:parameter_name`, `:parameter_scale`,
`:parameter_values`, `:measurements`.
To generate multiple curves for a `model` with a random number
generator (RNG) as a hyperparameter, specify the name, `rng_name`, of
the (possibly nested) RNG field, and a vector `rngs` of RNG's, one for
each curve. Alternatively, set `rngs` to the number of curves desired,
in which case RNG's are automatically generated. The individual curve
computations can be distributed across multiple processes using
`acceleration=CPUProcesses()` or `acceleration=CPUThreads()`. See the second example below for a
demonstration.
```julia
X, y = @load_boston;
atom = @load RidgeRegressor pkg=MultivariateStats
ensemble = EnsembleModel(atom=atom, n=1000)
mach = machine(ensemble, X, y)
r_lambda = range(ensemble, :(atom.lambda), lower=10, upper=500, scale=:log10)
curve = learning_curve(mach; range=r_lambda, resampling=CV(), measure=mav)
using Plots
plot(curve.parameter_values,
curve.measurements,
xlab=curve.parameter_name,
xscale=curve.parameter_scale,
ylab = "CV estimate of RMS error")
```
If using a `Holdout()` `resampling` strategy (with no shuffling) and
if the specified hyperparameter is the number of iterations in some
iterative model (and that model has an appropriately overloaded
`MLJModelInterface.update` method) then training is not restarted from scratch
for each increment of the parameter, ie the model is trained
progressively.
```julia
atom.lambda=200
r_n = range(ensemble, :n, lower=1, upper=250)
curves = learning_curve(mach; range=r_n, verbosity=0, rng_name=:rng, rngs=3)
plot!(curves.parameter_values,
curves.measurements,
xlab=curves.parameter_name,
ylab="Holdout estimate of RMS error")
```
learning_curve(model::Supervised, X, y; kwargs...)
learning_curve(model::Supervised, X, y, w; kwargs...)
Plot a learning curve (or curves) directly, without first constructing
a machine.
"""
learning_curve(mach::Machine{<:Supervised}; kwargs...) =
learning_curve(mach.model, mach.args...; kwargs...)
# for backwards compatibility
learning_curve!(mach::Machine{<:Supervised}; kwargs...) =
learning_curve(mach; kwargs...)
function learning_curve(model::Supervised, args...;
resolution=30,
resampling=Holdout(),
weights=nothing,
measures=nothing,
measure=measures,
operation=predict,
ranges::Union{Nothing,ParamRange}=nothing,
range::Union{Nothing,ParamRange},
repeats=1,
acceleration=default_resource(),
acceleration_grid=CPU1(),
verbosity=1,
rngs=nothing,
rng_name=nothing,
check_measure=true)
range !== nothing || error("No param range specified. Use range=... ")
if rngs != nothing
rng_name == nothing &&
error("Having specified `rngs=...`, you must specify "*
"`rng_name=...` also. ")
if rngs isa Integer
rngs = MersenneTwister.(1:rngs)
elseif rngs isa AbstractRNG
rngs = [rngs, ]
elseif !(rngs isa AbstractVector{<:AbstractRNG})
error("`rng` must have type `Integer` , `AbstractRNG` or "*
"`AbstractVector{<:AbstractRNG}`. ")
end
end
if (acceleration isa CPUProcesses &&
acceleration_grid isa CPUProcesses)
message =
"The combination acceleration=$(acceleration) and"*
" acceleration_grid=$(acceleration_grid) is"*
" not generally optimal. You may want to consider setting"*
" `acceleration = CPUProcesses()` and"*
" `acceleration_grid = CPUThreads()`."
@warn message
end
if (acceleration isa CPUThreads &&
acceleration_grid isa CPUProcesses)
message =
"The combination acceleration=$(acceleration) and"*
" acceleration_grid=$(acceleration_grid) isn't supported. \n"*
"Resetting to"*
" `acceleration = CPUProcesses()` and"*
" `acceleration_grid = CPUThreads()`."
@warn message
acceleration = CPUProcesses()
acceleration_grid = CPUThreads()
end
_acceleration = _process_accel_settings(acceleration)
tuned_model = TunedModel(model=model,
range=range,
tuning=Grid(resolution=resolution,
shuffle=false),
resampling=resampling,
operation=operation,
measure=measure,
train_best=false,
weights=weights,
repeats=repeats,
acceleration=acceleration_grid)
tuned = machine(tuned_model, args...)
results = _tuning_results(rngs, _acceleration, tuned, rng_name, verbosity)
parameter_name=results.parameter_names[1]
parameter_scale=results.parameter_scales[1]
parameter_values=[results.parameter_values[:, 1]...]
measurements = results.measurements
return (parameter_name=parameter_name,
parameter_scale=parameter_scale,
parameter_values=parameter_values,
measurements=measurements)
end
_collate(plotting1, plotting2) =
merge(plotting1,
(measurements=hcat(plotting1.measurements,
plotting2.measurements),))
# fallback:
#_tuning_results(rngs, acceleration, tuned, rngs_name, verbosity) =
# error("acceleration=$acceleration unsupported. ")
# single curve:
_tuning_results(rngs::Nothing, acceleration, tuned, rngs_name, verbosity) =
_single_curve(tuned, verbosity)
function _single_curve(tuned, verbosity)
fit!(tuned, verbosity=verbosity, force=true)
tuned.report.plotting
end
# CPU1:
function _tuning_results(rngs::AbstractVector, acceleration::CPU1,
tuned, rng_name, verbosity)
local ret
old_rng = recursive_getproperty(tuned.model.model, rng_name)
n_rngs = length(rngs)
verbosity < 1 || begin
p = Progress(n_rngs,
dt = 0,
desc = "Evaluating Learning curve with $(n_rngs) rngs: ",
barglyphs = BarGlyphs("[=> ]"),
barlen = 18,
color = :yellow)
update!(p,0)
end
ret = mapreduce(_collate, rngs) do rng
recursive_setproperty!(tuned.model.model, rng_name, rng)
fit!(tuned, verbosity=verbosity-1, force=true)
r =tuned.report.plotting
verbosity < 1 || begin
p.counter += 1
ProgressMeter.updateProgress!(p)
end
r
end
recursive_setproperty!(tuned.model.model, rng_name, old_rng)
return ret
end
# CPUProcesses:
function _tuning_results(rngs::AbstractVector, acceleration::CPUProcesses,
tuned, rng_name, verbosity)
old_rng = recursive_getproperty(tuned.model.model, rng_name)
n_rngs = length(rngs)
local ret
@sync begin
verbosity < 1 || begin
p = Progress(n_rngs,
dt = 0,
desc = "Evaluating Learning curve with $(n_rngs) rngs: ",
barglyphs = BarGlyphs("[=> ]"),
barlen = 18,
color = :yellow)
channel = RemoteChannel(()->Channel{Bool}(min(1000, n_rngs)), 1)
end
# printing the progress bar
verbosity < 1 || @async begin
update!(p,0)
while take!(channel)
p.counter +=1
ProgressMeter.updateProgress!(p)
end
end
ret = @distributed (_collate) for rng in rngs
recursive_setproperty!(tuned.model.model, rng_name, rng)
fit!(tuned, verbosity=verbosity-1, force=true)
r=tuned.report.plotting
verbosity < 1 || put!(channel, true)
r
end
verbosity < 1 || put!(channel, false)
end
recursive_setproperty!(tuned.model.model, rng_name, old_rng)
return ret
end
# CPUThreads:
@static if VERSION >= v"1.3.0-DEV.573"
function _tuning_results(rngs::AbstractVector, acceleration::CPUThreads,
tuned, rng_name, verbosity)
n_threads = Threads.nthreads()
if n_threads == 1
return _tuning_results(rngs, CPU1(),
tuned, rng_name, verbosity)
end
old_rng = recursive_getproperty(tuned.model.model, rng_name)
n_rngs = length(rngs)
ntasks = acceleration.settings
partitions = MLJBase.chunks(1:n_rngs, ntasks)
verbosity < 1 || begin
p = Progress(n_rngs,
dt = 0,
desc = "Evaluating Learning curve with $(n_rngs) rngs: ",
barglyphs = BarGlyphs("[=> ]"),
barlen = 18,
color = :yellow)
update!(p,0)
ch = Channel{Bool}(length(partitions))
end
tasks = Vector{Task}(undef, length(partitions))
@sync begin
verbosity < 1 || @async begin
while take!(ch)
p.counter +=1
ProgressMeter.updateProgress!(p)
end
end
# One t_tuned per task
## deepcopy of model is because other threads can still change the state
## of tuned.model.model
tmachs = [tuned, [machine(TunedModel(model = deepcopy(tuned.model.model),
range=tuned.model.range,
tuning=tuned.model.tuning,
resampling=tuned.model.resampling,
operation=tuned.model.operation,
measure=tuned.model.measure,
train_best=tuned.model.train_best,
weights=tuned.model.weights,
repeats=tuned.model.repeats,
acceleration=tuned.model.acceleration),
tuned.args...) for _ in 2:length(partitions)]...]
@sync for (i,rng_part) in enumerate(partitions)
tasks[i] = Threads.@spawn begin
mapreduce(_collate, rng_part) do k
recursive_setproperty!(tmachs[i].model.model, rng_name, rngs[k])
fit!(tmachs[i], verbosity=verbosity-1, force=true)
verbosity < 1 || put!(ch, true)
tmachs[i].report.plotting
end
end
end
verbosity < 1 || put!(ch, false)
end
ret = reduce(_collate, fetch.(tasks))
recursive_setproperty!(tuned.model.model, rng_name, old_rng)
return ret
end
end