Table 1 Summary of configuration of the ONN.

From: Accurate lithofacies identification in deep shale gas reservoirs via an optimized neural network recognition model, Qiongzhusi Formation, southern Sichuan

Hyperparameter Search Range

Model

Optimal point hyperparameter

Number of fully connected layers

1–3

1

Activation function

ReLU, sigmoid, and tanh

sigmoid

Iterations

30

22

Regularization intensity (Lambda)

0-1450

1.48e− 7

Standardize Data

Yes or No

Yes

Optimizer

Bayesian optimization: expected improvement per second

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