我正在尝试加载看起来像这样的YAML：

dist: !!opencv-matrix
   rows: 380
   cols: 380
   dt: f
   data: [ 0.,0.,-1.88644529e+18,2.45423365e+00,11698176.,2.03862047e+00,-8.85501460e+10,2.54738545e+00,1.71208843e+20,...
       2.44447327e+00 ]

加载代码只是：

import yaml
y = yaml.load(s)

其中s是加载到字符串中的YAML.

我收到此错误：

yaml.constructor.ConstructorError: could not determine a constructor for the tag 'tag:yaml.org,2002:opencv-matrix'
  in "

def opencv_matrix(loader,node):
    mapping = loader.construct_mapping(node)
    mat = np.array(mapping["data"])
    mat.resize(mapping["rows"],mapping["cols"])
    return mat

yaml.add_constructor(u"!!opencv-matrix",opencv_matrix)
y = yaml.load(s)