class_docstr: VGG16 image feature extractor.
docstr: Single image to resized and normalized image.
  
  The inputs image should have the shape (channel, height, width) where
  channels are aligned RGB. The returned image has the same shape but
  channels in BGR order.
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code: def prepare(self, img):
      """Single image to resized and normalized image.
  
      The inputs image should have the shape (channel, height, width) where
      channels are aligned RGB. The returned image has the same shape but
      channels in BGR order.
      """
      return L.model.vision.vgg.prepare(img)
  
imports: import numpy
  import chainer
  from chainer import functions
  from chainer import initializers
  from chainer import links
  from chainer import reporter
  from chainer import Variable
label_desc: Use image node_id 2 for calling the VGG16FeatureExtractor obj's underlying member method code with example usage: obj.prepare(img) and returns: L