class_docstr: A pre-trained object detector model.
  
  :param model_path The path containing the pre-trained model
code: def __init__(self, bigdl_type="float"):
      self.bigdl_type = bigdl_type
      super(ObjectDetector, self).__init__(None, bigdl_type)
  
imports: import sys
  from bigdl.util.common import JavaValue
  from zoo.models.image.common.image_model import ImageModel
  from zoo.common.utils import callZooFunc
  from zoo.feature.image.imageset import *
  from zoo.feature.image.imagePreprocessing import *
label_desc: Use image node_id 1 to create a new ObjectDetector object from inherited base classes: ImageModel with example: obj = ObjectDetector(bigdl_type)