Evaluation of Convolutional Neural Networks’ Hyperparameters with Transfer Learning to Determine Sorting of Ripe Medjool Dates

Blanca Dalila Pérez-Pérez, Juan Pablo García Vázquez and Ricardo Salomón-Torres
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Blanca Dalila Pérez-Pérez: Facultad de Ingeniería, Universidad Autónoma de Baja California (UABC), Mexicali 21100, Mexico
Juan Pablo García Vázquez: Facultad de Ingeniería, Universidad Autónoma de Baja California (UABC), Mexicali 21100, Mexico
Ricardo Salomón-Torres: Unidad Académica San Luis Río Colorado, Universidad Estatal de Sonora (UES), Sonora 83500, Mexico

Agriculture, 2021, vol. 11, issue 2, 1-12

Abstract: Convolutional neural networks (CNNs) have proven their efficiency in various applications in agriculture. In crops such as date, they have been mainly used in the identification and sorting of ripe fruits. The aim of this study was the performance evaluation of eight different CNNs, considering transfer learning for their training, as well as five hyperparameters. The CNN architectures evaluated were VGG-16, VGG-19, ResNet-50, ResNet-101, ResNet-152, AlexNet, Inception V3, and CNN from scratch. Likewise, the hyperparameters analyzed were the number of layers, the number of epochs, the batch size, optimizer, and learning rate. The accuracy and processing time were considered to determine the performance of CNN architectures, in the classification of mature dates’ cultivar Medjool. The model obtained from VGG-19 architecture with a batch of 128 and Adam optimizer with a learning rate of 0.01 presented the best performance with an accuracy of 99.32%. We concluded that the VGG-19 model can be used to build computer vision systems that help producers improve their sorting process to detect the Tamar stage of a Medjool date.

Keywords: Phoenix dactylifera L.; Medjool dates; image classification; convolutional neural networks; deep learning; transfer learning (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
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