Analyze
Analysis and model explainability functions in PyCaret
plot_model
This function analyzes the performance of a trained model on the hold-out set. It may require re-training the model in certain cases.
Example
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# creating a model
lr = create_model('lr')
# plot model
plot_model(lr, plot = 'auc')
Change the scale
The resolution scale of the figure can be changed with scale parameter.
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# creating a model
lr = create_model('lr')
# plot model
plot_model(lr, plot = 'auc', scale = 3)
Save the plot
You can save the plot as a png file using the save parameter.
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# creating a model
lr = create_model('lr')
# plot model
plot_model(lr, plot = 'auc', save = True)
Customize the plot
PyCaret uses Yellowbrick for most of the plotting work. Any argument that is acceptable for Yellowbrick visualizers can be passed as plot_kwargs parameter.
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# creating a model
lr = create_model('lr')
# plot model
plot_model(lr, plot = 'confusion_matrix', plot_kwargs = {'percent' : True})
Use train data
If you want to assess the model plot on the train data, you can pass use_train_data=True in the plot_model function.
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# creating a model
lr = create_model('lr')
# plot model
plot_model(lr, plot = 'auc', use_train_data = True)
Plot on train data vs. hold-out data
Examples by module
Classification
Plot Name
Plot
Area Under the Curve
‘auc’
Discrimination Threshold
‘threshold’
Precision Recall Curve
‘pr’
Confusion Matrix
‘confusion_matrix’
Class Prediction Error
‘error’
Classification Report
‘class_report’
Decision Boundary
‘boundary’
Recursive Feature Selection
‘rfe’
Learning Curve
‘learning’
Manifold Learning
‘manifold’
Calibration Curve
‘calibration’
Validation Curve
‘vc’
Dimension Learning
‘dimension’
Feature Importance (Top 10)
‘feature’
Feature IImportance (all)
'feature_all'
Model Hyperparameter
‘parameter’
Lift Curve
'lift'
Gain Curve
'gain'
KS Statistic Plot
'ks'
Regression
Name
Plot
Residuals Plot
‘residuals’
Prediction Error Plot
‘error’
Cooks Distance Plot
‘cooks’
Recursive Feature Selection
‘rfe’
Learning Curve
‘learning’
Validation Curve
‘vc’
Manifold Learning
‘manifold’
Feature Importance (top 10)
‘feature’
Feature Importance (all)
'feature_all'
Model Hyperparameter
‘parameter’
Clustering
Name
Plot
Cluster PCA Plot (2d)
‘cluster’
Cluster TSnE (3d)
‘tsne’
Elbow Plot
‘elbow’
Silhouette Plot
‘silhouette’
Distance Plot
‘distance’
Distribution Plot
‘distribution’
Anomaly Detection
Name
Plot
t-SNE (3d) Dimension Plot
‘tsne’
UMAP Dimensionality Plot
‘umap’
evaluate_model
The evaluate_model displays a user interface for analyzing the performance of a trained model. It calls the plot_model function internally.
# load dataset
from pycaret.datasets import get_data
juice = get_data('juice')
# init setup
from pycaret.classification import *
exp_name = setup(data = juice, target = 'Purchase')
# create model
lr = create_model('lr')
# launch evaluate widget
evaluate_model(lr)
interpret_model
This function analyzes the predictions generated from a trained model. Most plots in this function are implemented based on the SHAP (Shapley Additive exPlanations). For more info on this, please see https://shap.readthedocs.io/en/latest/
Example
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# creating a model
xgboost = create_model('xgboost')
# interpret model
interpret_model(xgboost)
Save the plot
You can save the plot as a png file using the save parameter.
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# creating a model
xgboost = create_model('xgboost')
# interpret model
interpret_model(xgboost, save = True)Change plot type
There are a few different plot types available that can be changed by the plot parameter.
Correlation
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# creating a model
xgboost = create_model('xgboost')
# interpret model
interpret_model(xgboost, plot = 'correlation')
By default, PyCaret uses the first feature in the dataset but that can be changed using feature parameter.
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# creating a model
xgboost = create_model('xgboost')
# interpret model
interpret_model(xgboost, plot = 'correlation', feature = 'Age (years)')
Partial Dependence Plot
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# creating a model
xgboost = create_model('xgboost')
# interpret model
interpret_model(xgboost, plot = 'pdp')
By default, PyCaret uses the first available feature in the dataset but this can be changed using the feature parameter.
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# creating a model
xgboost = create_model('xgboost')
# interpret model
interpret_model(xgboost, plot = 'pdp', feature = 'Age (years)')
Morris Sensitivity Analysis
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# creating a model
xgboost = create_model('xgboost')
# interpret model
interpret_model(xgboost, plot = 'msa')
Permutation Feature Importance
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# creating a model
xgboost = create_model('xgboost')
# interpret model
interpret_model(xgboost, plot = 'pfi')
Reason Plot
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# creating a model
xgboost = create_model('xgboost')
# interpret model
interpret_model(xgboost, plot = 'reason')
When you generate reason plot without passing the specific index of test data, you will get the interactive plot displayed with the ability to select the x and y-axis. This will only be possible if you are using Jupyter Notebook or an equivalent environment. If you want to see this plot for a specific observation, you will have to pass the index in the observation parameter.
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# creating a model
xgboost = create_model('xgboost')
# interpret model
interpret_model(xgboost, plot = 'reason', observation = 1)
Here the observation = 1 means index 1 from the test set.
Use train data
By default, all the plots are generated on the test dataset. If you want to generate plots using a train data set (not recommended) you can use use_train_data parameter.
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# creating a model
xgboost = create_model('xgboost')
# interpret model
interpret_model(xgboost, use_train_data = True)
dashboard
The dashboard function generates the interactive dashboard for a trained model. The dashboard is implemented using ExplainerDashboard (explainerdashboard.readthedocs.io)
Dashboard Example
# load dataset
from pycaret.datasets import get_data
juice = get_data('juice')
# init setup
from pycaret.classification import *
exp_name = setup(data = juice, target = 'Purchase')
# train model
lr = create_model('lr')
# launch dashboard
dashboard(lr)
Video:
check_fairness
There are many approaches to conceptualizing fairness. The check_fairness function follows the approach known as group fairness, which asks: which groups of individuals are at risk for experiencing harm. check_fairness provides fairness-related metrics between different groups (also called sub-population).
Check Fairness Example
# load dataset
from pycaret.datasets import get_data
income = get_data('income')
# init setup
from pycaret.classification import *
exp_name = setup(data = income, target = 'income >50K')
# train model
lr = create_model('lr')
# check model fairness
lr_fairness = check_fairness(lr, sensitive_features = ['sex', 'race'])
Video:
get_leaderboard
This function returns the leaderboard of all models trained in the current setup.
# load dataset
from pycaret.datasets import get_data
diabetes = get_data('diabetes')
# init setup
from pycaret.classification import *
clf1 = setup(data = diabetes, target = 'Class variable')
# compare models
top3 = compare_models(n_select = 3)
# tune top 3 models
tuned_top3 = [tune_model(i) for i in top3]
# ensemble top 3 tuned models
ensembled_top3 = [ensemble_model(i) for i in tuned_top3]
# blender
blender = blend_models(tuned_top3)
# stacker
stacker = stack_models(tuned_top3)
# check leaderboard
get_leaderboard()
You can also access the trained Pipeline with this.
# check leaderboard
lb = get_leaderboard()
# select top model
lb.iloc[0]['Model']
assign_model
This function assigns labels to the training dataset using the trained model. It is available for Clustering, Anomaly Detection, and NLP modules.
Clustering
# load dataset
from pycaret.datasets import get_data
jewellery = get_data('jewellery')
# init setup
from pycaret.clustering import *
clu1 = setup(data = jewellery)
# train a model
kmeans = create_model('kmeans')
# assign model
assign_model(kmeans)
Anomaly Detection
# load dataset
from pycaret.datasets import get_data
anomaly = get_data('anomaly')
# init setup
from pycaret.anomaly import *
ano1 = setup(data = anomaly)
# train a model
iforest = create_model('iforest')
# assign model
assign_model(iforest)
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