462
4 CONCLUSIONS
The proposed study attempts to develop an MLP-based deep learning network model for
prediction of quality of iron ores. The performance of the network is investigated for the different number of hidden layers (1, 2, 3, 4, and 5) and the different number of nodes in each
hidden layer (2, 3, 4, 5, 10, 50, 100, and 500). It is observed that the RMSE is lowest for the
model having 5-nodes and 3-hidden layers. The performance of the models was evaluated
using four indices including RMSE, normalized mean square error (NMSE), R-squared (R
2 ),
and bias. The RMSE, NMSE, and R-squared of the optimized model were obtained as 8.77,
0.0026, and 0.87 respectively. The results indicate that the model gives satisfactory performance in quality predictions of iron ores. The study was performed with less number of image
samples, and the performance can be further improved by increasing the number of samples.
The proposed technology of quality inspection may be more economical and robust. Thus,
the system can play a significant role in automation in the mineral industries. The bias of the
optimized model is found to be relatively high (1.14) and negative. A negative bias indicates
that the model performs with over prediction and thus the models need to be trained and
tested using more number of image samples.
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