| AdaGrad | Adaptive gradient |
| AE | Autoencoder |
| ANN | Artificial neural network |
| BBO | Biogeography-based optimization |
| DAE | Denoising autoencoder |
| DDAE | Deep denoising autoencoder |
| EBO | Ecogeography-based optimization |
| FCM | Fuzzy c-means clustering |
| GLW | Gradient-based layer-wise |
| IT2FIS | Interval type-2 neuro-fuzzy inference system |
| LED | Light-emitting diode |
| MLR | Multivariable linear regression |
| PFDDAE | Pythagorean fuzzy deep denoising autoencoder |
| PFN | Pythagorean-type fuzzy number |
| PSO | Particle swam optimization |
| SANFIS | Self-adaptive neuro-fuzzy inference system |
| UV | Ultraviolet |
| WWO | Water wave optimization |