Table 2 Basic settings for PySR
From: Crack Growth Rate Model Derived from Domain Knowledge-Guided Symbolic Regression
Parameters | Value |
|---|---|
Material | Al-7055-T7511 |
Niterations | 2000 |
Complexity | 20 |
Operators | ‘+’, ‘-’, ‘×’, ‘/’, ‘ln_abs()’ |
Constraints | ‘ln_abs’:(1) |
Loss | \({\text{MSE}} = \frac{1}{n}\sum\limits_{i = 1}^{n} {\left( {\hat{y}_{i} - \overline{y}} \right)^{2} }\) |
Input characters | \(\ln \Delta K,\ln \left( {1 - R} \right){\text{ or (1 - }}R{\text{) or }}R,\ln (1 - \frac{{\Delta K_{{{\text{th}}}} }}{\Delta K})\) |
Output character | \(\ln \frac{{{\text{d}}a}}{{{\text{d}}N}}\) |