Bayesian Logistic Regression
Bayesian logistic regression is the Bayesian counterpart to a common tool in machine learning, logistic regression. The goal of logistic regression is to predict a one or a zero for a given training item. An example might be predicting whether someone is sick or ill given their symptoms and personal information.
In our example, we'll be working to predict whether someone is likely to default with a synthetic dataset found in the RDatasets package. This dataset, Defaults, comes from R's ISLR package and contains information on borrowers.
To start, let's import all the libraries we'll need.
# Import Turing and Distributions.
using Turing, Distributions
# Import RDatasets.
using RDatasets
# Import MCMCChains, Plots, and StatsPlots for visualizations and diagnostics.
using MCMCChains, Plots, StatsPlots
# We need a logistic function, which is provided by StatsFuns.
using StatsFuns: logistic
# Functionality for splitting and normalizing the data
using MLDataUtils: shuffleobs, stratifiedobs, rescale!
# Set a seed for reproducibility.
using Random
Random.seed!(0);
Data Cleaning & Set Up
Now we're going to import our dataset. The first six rows of the dataset are shown below so you can get a good feel for what kind of data we have.
# Import the "Default" dataset.
data = RDatasets.dataset("ISLR", "Default");
# Show the first six rows of the dataset.
first(data, 6)
6×4 DataFrame
Row │ Default Student Balance Income
│ Cat… Cat… Float64 Float64
─────┼──────────────────────────────────────
1 │ No No 729.526 44361.6
2 │ No Yes 817.18 12106.1
3 │ No No 1073.55 31767.1
4 │ No No 529.251 35704.5
5 │ No No 785.656 38463.5
6 │ No Yes 919.589 7491.56
Most machine learning processes require some effort to tidy up the data, and this is no different. We need to convert the Default and Student columns, which say "Yes" or "No" into 1s and 0s. Afterwards, we'll get rid of the old words-based columns.
# Convert "Default" and "Student" to numeric values.
data[!, :DefaultNum] = [r.Default == "Yes" ? 1.0 : 0.0 for r in eachrow(data)]
data[!, :StudentNum] = [r.Student == "Yes" ? 1.0 : 0.0 for r in eachrow(data)]
# Delete the old columns which say "Yes" and "No".
select!(data, Not([:Default, :Student]))
# Show the first six rows of our edited dataset.
first(data, 6)
6×4 DataFrame
Row │ Balance Income DefaultNum StudentNum
│ Float64 Float64 Float64 Float64
─────┼────────────────────────────────────────────
1 │ 729.526 44361.6 0.0 0.0
2 │ 817.18 12106.1 0.0 1.0
3 │ 1073.55 31767.1 0.0 0.0
4 │ 529.251 35704.5 0.0 0.0
5 │ 785.656 38463.5 0.0 0.0
6 │ 919.589 7491.56 0.0 1.0
After we've done that tidying, it's time to split our dataset into training and testing sets, and separate the labels from the data. We separate our data into two halves, train and test. You can use a higher percentage of splitting (or a lower one) by modifying the at = 0.05 argument. We have highlighted the use of only a 5% sample to show the power of Bayesian inference with small sample sizes.
We must rescale our variables so that they are centered around zero by subtracting each column by the mean and dividing it by the standard deviation. Without this step, Turing's sampler will have a hard time finding a place to start searching for parameter estimates. To do this we will leverage MLDataUtils, which also lets us effortlessly shuffle our observations and perform a stratified split to get a representative test set.
function split_data(df, target; at=0.70)
shuffled = shuffleobs(df)
return trainset, testset = stratifiedobs(row -> row[target], shuffled; p=at)
end
features = [:StudentNum, :Balance, :Income]
numerics = [:Balance, :Income]
target = :DefaultNum
trainset, testset = split_data(data, target; at=0.05)
for feature in numerics
μ, σ = rescale!(trainset[!, feature]; obsdim=1)
rescale!(testset[!, feature], μ, σ; obsdim=1)
end
# Turing requires data in matrix form, not dataframe
train = Matrix(trainset[:, features])
test = Matrix(testset[:, features])
train_label = trainset[:, target]
test_label = testset[:, target];
Model Declaration
Finally, we can define our model.
logistic_regression takes four arguments:
xis our set of independent variables;yis the element we want to predict;nis the number of observations we have; andσis the standard deviation we want to assume for our priors.
Within the model, we create four coefficients (intercept, student, balance, and income) and assign a prior of normally distributed with means of zero and standard deviations of σ. We want to find values of these four coefficients to predict any given y.
The for block creates a variable v which is the logistic function. We then observe the likelihood of calculating v given the actual label, y[i].
# Bayesian logistic regression (LR)
@model function logistic_regression(x, y, n, σ)
intercept ~ Normal(0, σ)
student ~ Normal(0, σ)
balance ~ Normal(0, σ)
income ~ Normal(0, σ)
for i in 1:n
v = logistic(intercept + student * x[i, 1] + balance * x[i, 2] + income * x[i, 3])
y[i] ~ Bernoulli(v)
end
end;
Sampling
Now we can run our sampler. This time we'll use HMC to sample from our posterior.
# Retrieve the number of observations.
n, _ = size(train)
# Sample using HMC.
m = logistic_regression(train, train_label, n, 1)
chain = sample(m, NUTS(), MCMCThreads(), 1_500, 3)
Chains MCMC chain (1500×16×3 Array{Float64, 3}):
Iterations = 751:1:2250
Number of chains = 3
Samples per chain = 1500
Wall duration = 4.4 seconds
Compute duration = 3.95 seconds
parameters = intercept, student, balance, income
internals = lp, n_steps, is_accept, acceptance_rate, log_density, h
amiltonian_energy, hamiltonian_energy_error, max_hamiltonian_energy_error,
tree_depth, numerical_error, step_size, nom_step_size
Summary Statistics
parameters mean std naive_se mcse ess rhat
⋯
Symbol Float64 Float64 Float64 Float64 Float64 Float64
⋯
intercept -3.8086 0.3761 0.0056 0.0067 3242.0506 1.0008
⋯
student -1.8896 0.6208 0.0093 0.0100 3125.6672 0.9999
⋯
balance 1.6504 0.2624 0.0039 0.0047 3061.7388 1.0004
⋯
income -0.5279 0.3206 0.0048 0.0054 3094.8189 1.0005
⋯
1 column om
itted
Quantiles
parameters 2.5% 25.0% 50.0% 75.0% 97.5%
Symbol Float64 Float64 Float64 Float64 Float64
intercept -4.5795 -4.0591 -3.7979 -3.5426 -3.1068
student -3.1229 -2.2891 -1.8957 -1.4682 -0.6898
balance 1.1424 1.4737 1.6443 1.8256 2.1642
income -1.1619 -0.7435 -0.5226 -0.3092 0.0867
Since we ran multiple chains, we may as well do a spot check to make sure each chain converges around similar points.
plot(chain)
Looks good!
We can also use the corner function from MCMCChains to show the distributions of the various parameters of our logistic regression.
# The labels to use.
l = [:student, :balance, :income]
# Use the corner function. Requires StatsPlots and MCMCChains.
corner(chain, l)
Fortunately the corner plot appears to demonstrate unimodal distributions for each of our parameters, so it should be straightforward to take the means of each parameter's sampled values to estimate our model to make predictions.
Making Predictions
How do we test how well the model actually predicts whether someone is likely to default? We need to build a prediction function that takes the test object we made earlier and runs it through the average parameter calculated during sampling.
The prediction function below takes a Matrix and a Chain object. It takes the mean of each parameter's sampled values and re-runs the logistic function using those mean values for every element in the test set.
function prediction(x::Matrix, chain, threshold)
# Pull the means from each parameter's sampled values in the chain.
intercept = mean(chain[:intercept])
student = mean(chain[:student])
balance = mean(chain[:balance])
income = mean(chain[:income])
# Retrieve the number of rows.
n, _ = size(x)
# Generate a vector to store our predictions.
v = Vector{Float64}(undef, n)
# Calculate the logistic function for each element in the test set.
for i in 1:n
num = logistic(
intercept .+ student * x[i, 1] + balance * x[i, 2] + income * x[i, 3]
)
if num >= threshold
v[i] = 1
else
v[i] = 0
end
end
return v
end;
Let's see how we did! We run the test matrix through the prediction function, and compute the mean squared error (MSE) for our prediction. The threshold variable sets the sensitivity of the predictions. For example, a threshold of 0.07 will predict a defualt value of 1 for any predicted value greater than 0.07 and no default if it is less than 0.07.
# Set the prediction threshold.
threshold = 0.07
# Make the predictions.
predictions = prediction(test, chain, threshold)
# Calculate MSE for our test set.
loss = sum((predictions - test_label) .^ 2) / length(test_label)
0.11821052631578947
Perhaps more important is to see what percentage of defaults we correctly predicted. The code below simply counts defaults and predictions and presents the results.
defaults = sum(test_label)
not_defaults = length(test_label) - defaults
predicted_defaults = sum(test_label .== predictions .== 1)
predicted_not_defaults = sum(test_label .== predictions .== 0)
println("Defaults: $defaults
Predictions: $predicted_defaults
Percentage defaults correct $(predicted_defaults/defaults)")
println("Not defaults: $not_defaults
Predictions: $predicted_not_defaults
Percentage non-defaults correct $(predicted_not_defaults/not_defaults)")
Defaults: 316.0
Predictions: 265
Percentage defaults correct 0.8386075949367089
Not defaults: 9184.0
Predictions: 8112
Percentage non-defaults correct 0.8832752613240418
The above shows that with a threshold of 0.07, we correctly predict a respectable portion of the defaults, and correctly identify most non-defaults. This is fairly sensitive to a choice of threshold, and you may wish to experiment with it.
This tutorial has demonstrated how to use Turing to perform Bayesian logistic regression.
Appendix
These tutorials are a part of the TuringTutorials repository, found at: https://github.com/TuringLang/TuringTutorials.
To locally run this tutorial, do the following commands:
using TuringTutorials
TuringTutorials.weave("02-logistic-regression", "02_logistic-regression.jmd")
Computer Information:
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[ea2f1a96] Xorg_libXrender_jll v0.9.10+4
[14d82f49] Xorg_libpthread_stubs_jll v0.1.0+3
[c7cfdc94] Xorg_libxcb_jll v1.13.0+3
[cc61e674] Xorg_libxkbfile_jll v1.1.0+4
[12413925] Xorg_xcb_util_image_jll v0.4.0+1
[2def613f] Xorg_xcb_util_jll v0.4.0+1
[975044d2] Xorg_xcb_util_keysyms_jll v0.4.0+1
[0d47668e] Xorg_xcb_util_renderutil_jll v0.3.9+1
[c22f9ab0] Xorg_xcb_util_wm_jll v0.4.1+1
[35661453] Xorg_xkbcomp_jll v1.4.2+4
[33bec58e] Xorg_xkeyboard_config_jll v2.27.0+4
[c5fb5394] Xorg_xtrans_jll v1.4.0+3
[3161d3a3] Zstd_jll v1.5.4+0
[214eeab7] fzf_jll v0.29.0+0
[a4ae2306] libaom_jll v3.4.0+0
[0ac62f75] libass_jll v0.15.1+0
[f638f0a6] libfdk_aac_jll v2.0.2+0
[b53b4c65] libpng_jll v1.6.38+0
[f27f6e37] libvorbis_jll v1.3.7+1
[1270edf5] x264_jll v2021.5.5+0
[dfaa095f] x265_jll v3.5.0+0
[d8fb68d0] xkbcommon_jll v1.4.1+0
[0dad84c5] ArgTools
[56f22d72] Artifacts
[2a0f44e3] Base64
[ade2ca70] Dates
[8bb1440f] DelimitedFiles
[8ba89e20] Distributed
[f43a241f] Downloads
[9fa8497b] Future
[b77e0a4c] InteractiveUtils
[4af54fe1] LazyArtifacts
[b27032c2] LibCURL
[76f85450] LibGit2
[8f399da3] Libdl
[37e2e46d] LinearAlgebra
[56ddb016] Logging
[d6f4376e] Markdown
[a63ad114] Mmap
[ca575930] NetworkOptions
[44cfe95a] Pkg
[de0858da] Printf
[3fa0cd96] REPL
[9a3f8284] Random
[ea8e919c] SHA
[9e88b42a] Serialization
[1a1011a3] SharedArrays
[6462fe0b] Sockets
[2f01184e] SparseArrays
[10745b16] Statistics
[4607b0f0] SuiteSparse
[fa267f1f] TOML
[a4e569a6] Tar
[8dfed614] Test
[cf7118a7] UUIDs
[4ec0a83e] Unicode
[e66e0078] CompilerSupportLibraries_jll
[deac9b47] LibCURL_jll
[29816b5a] LibSSH2_jll
[c8ffd9c3] MbedTLS_jll
[14a3606d] MozillaCACerts_jll
[4536629a] OpenBLAS_jll
[05823500] OpenLibm_jll
[efcefdf7] PCRE2_jll
[83775a58] Zlib_jll
[8e850ede] nghttp2_jll
[3f19e933] p7zip_jll