Table 4 Hyperparameters of ML models.

From: Hybrid physics-machine learning models for predicting rate of penetration in the Halahatang oil field, Tarim Basin

Models

Hyperparameter

Value

ANN

The ith element represents the number of neurons in the ith hidden layer

(1000, 500)

Activation function for the hidden layer

relu

The solver for weight optimization

adam

Strength of the L2 regularization term

0.01

Maximum number of iterations

500,000

SVM

Specifies the kernel type to be used in the algorithm

rbf

Degree of the polynomial kernel function

3

Kernel coefficient for ‘rbf’, ‘poly’ and ‘sigmoid’

scale

Regularization parameter

50.0

Epsilon in the epsilon-SVR model

0.1

RF

The number of trees in the forest

140

The function to measure the quality of a split

SE

The number of features to consider when looking for best split

1.0

The minimum number of samples required to be at a leaf node

2