pycaffe的使用
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caffe的官方完美的支持python语言的兼容,提供了pycaffe的接口。用起来很方便,首先来看一下最常用到的:caffe的一个程序跑完之后会在snapshot所指定的目录下产生一个后缀名为caffemodel的文件,这里存放的就是我们在训练网络的时候得到的每层的参数信息,具体访问由net.params['layerName'][0].data访问权重参数(num_filter,channel,weight,high),net.params['layerName'][1].data访问biase,格式是(biase,)。如下图所示:这里的net.params使用的是字典格式
当然还有保存网络结构的字典类型net.blobs['layerName'].data。这里最常用的也就是net.blobs['data']相关的使用,例如得到输入图片的大小net.blobs['data'].data.shape。改变输入图片的大小net.blobs['data'].reshape(0,3,227,227),把图片fed into网络。net.blob['data'].data[...]=inputImage,注意,这里最后一个data是一个数组,要是只有一张图片就这样net.blob['data'].data[0]=inputImage。如下图所示:
下面用python实现一个使用自己的图片的例子:
- import numpy as np
- import sys,os
-
- caffe_root = '/home/xxx/caffe/'
-
- sys.path.insert(0, caffe_root + 'python')
- import caffe
- os.chdir(caffe_root)
-
-
- net_file=caffe_root + 'models/bvlc_reference_caffenet/deploy.prototxt'
-
- caffe_model=caffe_root + 'models/bvlc_reference_caffenet/bvlc_reference_caffenet.caffemodel'
-
- mean_file=caffe_root + 'python/caffe/imagenet/ilsvrc_2012_mean.npy'
-
-
-
- net = caffe.Net(net_file,caffe_model,caffe.TEST)
-
- transformer = caffe.io.Transformer({'data': net.blobs['data'].data.shape})
-
-
-
-
- transformer.set_transpose('data', (2,0,1))
- transformer.set_mean('data', np.load(mean_file).mean(1).mean(1))
-
- transformer.set_raw_scale('data', 255)
-
- transformer.set_channel_swap('data', (2,1,0))
-
-
- im=caffe.io.load_image(caffe_root+'examples/images/cat.jpg')
-
- net.blobs['data'].data[...] = transformer.preprocess('data',im)
-
- out = net.forward()
-
- output_prob = output['prob'][0]
-
- print 'predicted class is:', output_prob.argmax()
-
-
- top_inds = output_prob.argsort()[::-1][:5]
- print 'probabilities and labels:'
- zip(output_prob[top_inds], labels[top_inds])
-
-
- imagenet_labels_filename = caffe_root + 'data/ilsvrc12/synset_words.txt'
- labels = np.loadtxt(imagenet_labels_filename, str, delimiter='\t')
-
- top_k = net.blobs['prob'].data[0].flatten().argsort()[-1:-6:-1]
- for i in np.arange(top_k.size):
- print top_k[i], labels[top_k[i]]
- import os
- import numpy as np
- import os
- import matplotlib.pyplot as plt
- import matplotlib.patches as mpatches
- %matplotlib inline
-
-
- plt.rcParams['figure.figsize'] = (10, 10)
- plt.rcParams['image.interpolation'] = 'nearest'
- plt.rcParams['image.cmap'] = 'gray'
- from math import pow
- from skimage import transform as tf
-
- caffe_root='/opt/modules/caffe-master/'
- sys.insert.path(0,caffe_root+'python')
-
- caffe_modelcaffe=caffe_root+''
- caffe_deploy=caffe_root+''
-
- caffe.set_mode_cpu()
- net=caffe.Net(caffe_deploy,caffe_modelcaffe,caffe.TEST)
-
-
- transform=caffe.io.Transformer({'data':net.blobs['data'].data.shape})
- transform.set_transpose('data',(2,0,1))
- transform.set_raw_scale('data',255)
- transform.set_channel_swap('data',(2,1,0))
-
-
- net.blobs['data'].reshape(1,2,227,227)
-
- image=caffe.io.load_image('/opt/data/person/1.jpg')
- transformed_image=transform.preprocess('data',image)
- plt.inshow(image)
-
-
- net.blobs['data'].data[...]=transformed_image
-
- output=net.forward()
-
-
-
- output_pro=output['prob'][0]
-
-
- output_pro_max_index=output_pro.argmax()
-
- labels_file = caffe_root + '.../synset_words.txt'
- if not os.path.exists(labels_file):
- print "in the direct without this synset_words.txt "
- return
- labels=np.loadtxt(labels_file,str,delimiter='\t')
-
-
- outpur_label=labels[output_pro_max_index]
-
- top_five_index=output_pro.argsort()[::-1][:5]
- print 'probabilities and labels:'
- zip(output_pro[top_five_index],labels[top_five_index])