class AnchorGenerator：def generate_anchors测试

First of all, for initialization, self.cell_anchors, traverse zip(sizes, aspect_ratios), and pass it into generate_anchors. For generate_anchors, the parameters obtained are actually size=(128, 256, 512), aspect_ratio=(0.5, 1.0, 2.0). The result is as follows

   def __init__(
        self,
        sizes=((128, 256, 512),),
        aspect_ratios=