Python2：'!../'的含义

Question

你好我正在通过这个教程学习caffe(http://nbviewer.jupyter.org/github/BVLC/caffe/blob/tutorial/examples/00-caffe-intro.ipynb)

我不知道'!../'在代码中的含义，例如下面的代码：

import os
if os.path.isfile(caffe_root + 'models/bvlc_reference_caffenet/bvlc_reference_caffenet.caffemodel'):
    print 'CaffeNet found.'
else:
    print 'Downloading pre-trained CaffeNet model...'
    !../scripts/download_model_binary.py ../models/bvlc_reference_caffenet

# load ImageNet labels (for understanding the output)
labels_file = 'synset_words.txt'
if not os.path.exists(labels_file):
    print 'begin'
    !../home2/challege98/caffe/data/ilsvrc12/get_ilsvrc_aux.sh
    print 'finish'
labels = np.loadtxt(labels_file, str, delimiter='\t')

能不能详细解释一下，我在运行代码的时候，出现了错误：

Downloading pre-trained CaffeNet model...
/bin/sh: 1: ../scripts/download_model_binary.py: not found
begin
/bin/sh: 1: ../home2/challege98/caffe/data/ilsvrc12/get_ilsvrc_aux.sh: not found
finish
---------------------------------------------------------------------------
IOError                                   Traceback (most recent call last)
<ipython-input-19-8534d29d47f5> in <module>()
     12     get_ipython().system(u'../home2/challege98/caffe/data/ilsvrc12/get_ilsvrc_aux.sh')
     13     print 'finish'
---> 14 labels = np.loadtxt(labels_file, str, delimiter='\t')
     15 
     16 

/usr/local/lib/python2.7/dist-packages/numpy/lib/npyio.pyc in loadtxt(fname, dtype, comments, delimiter, converters, skiprows, usecols, unpack, ndmin)
    856                 fh = iter(bz2.BZ2File(fname))
    857             elif sys.version_info[0] == 2:
--> 858                 fh = iter(open(fname, 'U'))
    859             else:
    860                 fh = iter(open(fname))

IOError: [Errno 2] No such file or directory: 'synset_words.txt'

Answer 1

感叹号是运行一个shell命令。参见 here。

您看到的错误是因为文件 synset_words.txt 不存在并且没有被创建，因为它找不到创建它的脚本。检查此路径是否正确：../home2/challege98/caffe/data/ilsvrc12/get_ilsvrc_aux.sh

Python2：'!../'的含义

Python2: the meaning of '!../'

sh

python-2.7

caffe