| Reference | Model | Input number | Input layer | Output layer |
| Zhang et al. [22] | AHP and BPANN | 9 | UCS, bit size, bit type, drillability coefficient, gross hours drilled, WOB, RPM, drilling mud density, and AV (Apparent Viscosity) | ROP | Jahanbakhshi et al. [13] | ANN | 20 | Differential pressure, hydraulics, hole depth, pump pressure, density of the overlying rock, equivalent circulating density, hole size, formation drillability, permeability and porosity, drilling fluid type, plastic viscosity of mud, yield point of mud, initial gel strength of mud, 10 min Gel strength of mud bit type and its properties, weight on the bit and rotary speed, bit wear, and bit hydraulic power | ROP | Bahari and Seyed [11] | Fuzzy | 4 | UCS, rock quality designation, bit Load, and bit rotation | ROP | Amar and Ibrahim [25] | Radial-basis function and ELM | 7 | Depth, bit weight, rotary speed, tooth wear, Reynolds number function, ECD, and pore gradient | ROP | Bilgesu et al. [12] | ANN | 9 | Formation drillability, formation abrasiveness, bearing wear, tooth wear, pump rate, rotating time, rotary torque, WOB, and rotary speed | ROP | Bataee and Mohseni [2] | ANN | 4 | Bit diameter, WOB, RPM, and mud weight | ROP | Moran et al. [26] | ANN | 6 | Rock strength, rock type, abrasion, WOB, RPM, and mud weight | ROP and wear | Monazami et al. [27] | ANN | 13 | Drill collar outside diameter, drill collar length, kick of point, azimuth, inclination angle, weight on bit, flow rate, bit rotation speed, mud weight, solid percent, plastic viscosity, yield point, and measured depth | ROP |
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