Table 2 Model hyperparameters and optimization methods.

From: Fast and robust mixed gas identification and recognition using tree-based machine learning and sensor array response

Model

Hyperparameter

Value/Range

Optimization Method

ET

n_estimators

200

Bayesian Search

 

max_features

sqrt (square root of total features)

 
 

max_depth

10

 

RF

n_estimators

150

Grid Search

 

criterion

Gini impurity

 
 

max_depth

12

 

DT

max_depth

8

Manual Tuning

 

min_samples_split

5

 

SVM

kernel

Radial Basis Function (RBF)

Cross-Validation

 

C (regularization)

1.0

 
 

gamma

scale

 

LSTM

hidden_units

64

Random Search

 

dropout_rate

0.2

 
 

epochs

100