目前，国内关于评估预训练与微调对卷积神经网络性能影响的研究较少。基于此，提出采用 Caffe 框架中的 CaffeNet 网络结构，将卷积神经网络用于图片物体识别。为更直观分析计算过程，将卷积网络中部分隐含层特征进行了可视化，并在 Caltech-101数据集上分析了随机初始化与预训练模型初始化条件下深度卷积的分类效果，以及全局微调模式与局部微调模式对图像分类的影响。结果表明，预训练模型初始化能够极大提高收敛速度和识别正确率，全局微调模式能较好地拟合新的样本数据，同样提高了识别正确率。在 Caltech-101数据集上获得了95．24％的平均识别率，更加有效地优化了图像识别过程。%At present,there are few studies about the effect of pre-training and fine tuning on the performance of convolutional neural network.Based on this,we proposed adopting CaffeNet network structure developed by Caffe framework and using convolutional neural network for image object recognition.In order to analyze the calculation process more intutively,we visualized the hidden layers’features in convolutional network.Through two experiments on Caltech-101 data sets,we analyzed the effects of randomly initialized model and pre-training model on the performance of deep convolutional classification as well as the effects of global fine tuning mode and local fine tuning mode on the performance of image classification.Experimental results showed that the pre-training model initialization can greatly improve the convergence speed and recognition accuracy,while the global fine tuning mode can fit the new sample data well and improve recognition accuracy as well.We achieved the mean recognition accuracy of 95.24% on Caltech-101 data sets and optimized the image recognition process more effectively.
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