code: def crop(frame, y0, x0, y1, x1):
      return frame[int(y0) : int(y1), int(x0) : int(x1), :]
  
file_path: SerpentAI/serpent/frame_transformer.py
imports: import skimage.transform
  import skimage.color
  import skimage.util
  from PIL import Image
  import io
label_desc: Use image node_id 4 for calling the FrameTransformer obj's underlying member method code with example usage: obj.crop(frame, y0, x0, y1, x1) and returns: frame