| Summary: | 碩士 === 國立中央大學 === 數學系 === 107 === In recent years, deep learning has flourished and people have begun to use deep learning to solve problems. Deep neural networks can be used for speech recognition, image recognition, object detection, face recognition, or driverless. The most basic neural network is the Multilayer Perceptron (MLP), which consists of multiple node layers, each layer is fully connected to each other, and one of the drawbacks of MLP is that it ignores the shape of the data which is important for image data. Compare to traditional neural networks, the convolutional neural network (CNN) has additional convolution and pooling layers which are used for preserving and capturing image features.
The accuracy rate for prediction using neural network depends on many factors, such as the architecture of neural networks, the cost functions, and the selection of an optimizer. The goal of this work is to investigate the effects of optimizer selection and their hyperparameter tuning on the performance of deep neural networks for image recognition problems. We use three data sets including MNIST, CIFAR-10 and train route scenarios as test problems and test six optimizers (Gradient descent, Momentum, Adaptive gradient algorithm, Adadelta, Root Mean Square Propagation, and Adam). Our numerical results show that Adam is a good choice because of its efficiency and robustness.
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