本文主要是介绍caffe+python 使用训练好的VGG16模型 对 单张图片进行分类，输出置信度，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
网上看了一堆都是图片转lmdb格式，然后测试总的准确率，我想测试每张图片的top1，top2以及对应置信度是多少，摸索了一下午+一晚上终于搞定，期间遇到不少坑！！！同时感谢实验室博士师兄一块帮我找bug
说明：数据集是上海BOT大赛的（12种动物），网上下载的vgg16权重文件，并且修改输出类别为12，对最后三层全连接网络训练了8个小时，top1准确率为80%，top5准确率95%
使用的测试图片是一个长颈鹿，类别编号是8，结果如下：
预测源码
#coding:utf-8
import numpy as np
import caffebot_data_root = 'F:/bot_data'# 设置网络结构
net_file = bot_data_root + '/myVGG16/VGG_ILSVRC_16_layers_deploy.prototxt'
# 添加训练之后的网络权重参数
caffe_model = bot_data_root + '/myVGG16/myvggmodel__iter_80000.caffemodel'
# 均值文件
mean_file = bot_data_root + '/myVGG16/mean.npy'
# 设置使用gpu
caffe.set_mode_gpu()# 构造一个Net
net = caffe.Net(net_file, caffe_model, caffe.TEST)
# 得到data的形状，这里的图片是默认matplotlib底层加载的
transformer = caffe.io.Transformer({'data': net.blobs['data'].data.shape})
# matplotlib加载的image是像素[0-1],图片的数据格式[weight,high,channels]，RGB
# caffe加载的图片需要的是[0-255]像素，数据格式[channels,weight,high],BGR，那么就需要转换# channel 放到前面
transformer.set_transpose('data', (2, 0, 1))
transformer.set_mean('data', np.load(mean_file).mean(1).mean(1))
# 图片像素放大到[0-255]
transformer.set_raw_scale('data', 255)
# RGB-->BGR 转换
transformer.set_channel_swap('data', (2, 1, 0))
#设置输入的图片shape，1张，3通道，长宽都是224
net.blobs['data'].reshape(1, 3, 224, 224)
# 加载图片
im = caffe.io.load_image(bot_data_root + '/test_min/Testset 1/0a3e66aea7f64597ad851bfffb929c5a.png')# 用上面的transformer.preprocess来处理刚刚加载图片
net.blobs['data'].data[...] = transformer.preprocess('data', im)#输出每层网络的name和shape
for layer_name, blob in net.blobs.iteritems():print layer_name + '\t' + str(blob.data.shape)# 网络开始向前传播啦
output = net.forward()# 找出最大的那个概率
output_prob = output['out'][0]
print '预测的类别是:', output_prob.argmax()# 找出最可能的前俩名的类别和概率
top_inds = output_prob.argsort()[::-1][:2]
print "预测最可能的前两名的编号: ",top_inds
print "对应类别的概率是: ", output_prob[top_inds[0]], output_prob[top_inds[1]]
网络结构代码
name: "VGG_ILSVRC_16_layers"
input: "data"
input_dim: 1
input_dim: 3
input_dim: 224
input_dim: 224
layers {bottom: "data"top: "conv1_1"name: "conv1_1"type: CONVOLUTIONconvolution_param {num_output: 64pad: 1kernel_size: 3}blobs_lr: 0blobs_lr: 0
}
layers {bottom: "conv1_1"top: "conv1_1"name: "relu1_1"type: RELU
}
layers {bottom: "conv1_1"top: "conv1_2"name: "conv1_2"type: CONVOLUTIONconvolution_param {num_output: 64pad: 1kernel_size: 3}blobs_lr: 0blobs_lr: 0
}
layers {bottom: "conv1_2"top: "conv1_2"name: "relu1_2"type: RELU
}
layers {bottom: "conv1_2"top: "pool1"name: "pool1"type: POOLINGpooling_param {pool: MAXkernel_size: 2stride: 2}
}
layers {bottom: "pool1"top: "conv2_1"name: "conv2_1"type: CONVOLUTIONconvolution_param {num_output: 128pad: 1kernel_size: 3}blobs_lr: 0blobs_lr: 0
}
layers {bottom: "conv2_1"top: "conv2_1"name: "relu2_1"type: RELU
}
layers {bottom: "conv2_1"top: "conv2_2"name: "conv2_2"type: CONVOLUTIONconvolution_param {num_output: 128pad: 1kernel_size: 3}blobs_lr: 0blobs_lr: 0
}
layers {bottom: "conv2_2"top: "conv2_2"name: "relu2_2"type: RELU
}
layers {bottom: "conv2_2"top: "pool2"name: "pool2"type: POOLINGpooling_param {pool: MAXkernel_size: 2stride: 2}
}
layers {bottom: "pool2"top: "conv3_1"name: "conv3_1"type: CONVOLUTIONconvolution_param {num_output: 256pad: 1kernel_size: 3}blobs_lr: 0blobs_lr: 0
}
layers {bottom: "conv3_1"top: "conv3_1"name: "relu3_1"type: RELU
}
layers {bottom: "conv3_1"top: "conv3_2"name: "conv3_2"type: CONVOLUTIONconvolution_param {num_output: 256pad: 1kernel_size: 3}blobs_lr: 0blobs_lr: 0
}
layers {bottom: "conv3_2"top: "conv3_2"name: "relu3_2"type: RELU
}
layers {bottom: "conv3_2"top: "conv3_3"name: "conv3_3"type: CONVOLUTIONconvolution_param {num_output: 256pad: 1kernel_size: 3}blobs_lr: 0blobs_lr: 0
}
layers {bottom: "conv3_3"top: "conv3_3"name: "relu3_3"type: RELU
}
layers {bottom: "conv3_3"top: "pool3"name: "pool3"type: POOLINGpooling_param {pool: MAXkernel_size: 2stride: 2}
}
layers {bottom: "pool3"top: "conv4_1"name: "conv4_1"type: CONVOLUTIONconvolution_param {num_output: 512pad: 1kernel_size: 3}blobs_lr: 0blobs_lr: 0
}
layers {bottom: "conv4_1"top: "conv4_1"name: "relu4_1"type: RELU
}
layers {bottom: "conv4_1"top: "conv4_2"name: "conv4_2"type: CONVOLUTIONconvolution_param {num_output: 512pad: 1kernel_size: 3}blobs_lr: 0blobs_lr: 0
}
layers {bottom: "conv4_2"top: "conv4_2"name: "relu4_2"type: RELU
}
layers {bottom: "conv4_2"top: "conv4_3"name: "conv4_3"type: CONVOLUTIONconvolution_param {num_output: 512pad: 1kernel_size: 3}blobs_lr: 0blobs_lr: 0
}
layers {bottom: "conv4_3"top: "conv4_3"name: "relu4_3"type: RELU
}
layers {bottom: "conv4_3"top: "pool4"name: "pool4"type: POOLINGpooling_param {pool: MAXkernel_size: 2stride: 2}
}
layers {bottom: "pool4"top: "conv5_1"name: "conv5_1"type: CONVOLUTIONconvolution_param {num_output: 512pad: 1kernel_size: 3}blobs_lr: 0blobs_lr: 0
}
layers {bottom: "conv5_1"top: "conv5_1"name: "relu5_1"type: RELU
}
layers {bottom: "conv5_1"top: "conv5_2"name: "conv5_2"type: CONVOLUTIONconvolution_param {num_output: 512pad: 1kernel_size: 3}blobs_lr: 0blobs_lr: 0
}
layers {bottom: "conv5_2"top: "conv5_2"name: "relu5_2"type: RELU
}
layers {bottom: "conv5_2"top: "conv5_3"name: "conv5_3"type: CONVOLUTIONconvolution_param {num_output: 512pad: 1kernel_size: 3}blobs_lr: 0blobs_lr: 0
}
layers {bottom: "conv5_3"top: "conv5_3"name: "relu5_3"type: RELU
}
layers {bottom: "conv5_3"top: "pool5"name: "pool5"type: POOLINGpooling_param {pool: MAXkernel_size: 2stride: 2}
}
layers {bottom: "pool5"top: "fc6"name: "fc6"type: INNER_PRODUCTinner_product_param {num_output: 4096}blobs_lr: 1blobs_lr: 2
}
layers {bottom: "fc6"top: "fc6"name: "relu6"type: RELU
}
layers {bottom: "fc6"top: "fc6"name: "drop6"type: DROPOUTdropout_param {dropout_ratio: 0.5}
}
layers {bottom: "fc6"top: "fc7"name: "fc7"type: INNER_PRODUCTinner_product_param {num_output: 4096}blobs_lr: 1blobs_lr: 2
}
layers {bottom: "fc7"top: "fc7"name: "relu7"type: RELU
}
layers {bottom: "fc7"top: "fc7"name: "drop7"type: DROPOUTdropout_param {dropout_ratio: 0.5}
}
layers {name: "myfc8"bottom: "fc7"top: "myfc8"type: INNER_PRODUCTinner_product_param {num_output: 12weight_filler { type: "gaussian" std: 0.01 } bias_filler { type: "constant" value: 0 } }blobs_lr: 10blobs_lr: 20
}
layers {bottom: "myfc8"top: "out"name: "out"type: SOFTMAX
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