old_contents: from skimage.feature import hog
  from skimage import colos
  
  from pelops.etl.feature_producer import FeatureProducer
  
  
  class HOGFeatureProducer(FeatureProducer):
  
      def __init__(self, chip_producer):
          super().__init__(chip_producer)
  
      def produce_features(self, chip):
          """Takes a chip object and returns a feature vector of size
          self.feat_size. """
          img = PIL_Image.open(chip.filepath)
          img = img.resize((256, 256), PIL_Image.BICUBIC)
          img_x, img_y = img.size
          img = color.rgb2gray(np.array(img))
          features = hog(
              img,
              orientations=8,
              pixels_per_cell=(int(img_x / 16), int(img_y / 16)),
              cells_per_block=(16, 16),  # Normalize over the whole image
          )
          return features
  
      def set_variables(self):
          """Child classes should use this to set self.feat_size, and any other
          needed variables. """
          self.feat_size = 2048  # Set this in your inherited class
  
new_contents: from skimage.feature import hog
  from skimage import colos
  
  from pelops.etl.feature_producer import FeatureProducer
  
  
  class HOGFeatureProducer(FeatureProducer):
  
      def __init__(self, chip_producer, image_size=(256,256), cells=(16, 16), orientations=8):
          super().__init__(chip_producer)
          self.image_size = image_size
          self.cells = cells
          self.orientations = orientations
  
      def produce_features(self, chip):
          """Takes a chip object and returns a feature vector of size
          self.feat_size. """
          img = PIL_Image.open(chip.filepath)
          img = img.resize(self.image_size, PIL_Image.BICUBIC)
          img_x, img_y = img.size
          img = color.rgb2gray(np.array(img))
          features = hog(
              img,
              orientations=self.orientations,
              pixels_per_cell=(img_x / cells[0], img_y / cells[1]),
              cells_per_block=cells,  # Normalize over the whole image
          )
          return features
  
      def set_variables(self):
          self.feat_size = self.cells[0] * self.cells[1] * orientations
  
subject: Replace magic numbers in `HOGFeatureProducer`