class_docstr: Assign a corresponding gt bbox or background to each point.
  
  Each proposals will be assigned with `0`, or a positive integer
  indicating the ground truth index.
  
  - 0: negative sample, no assigned gt
  - positive integer: positive sample, index (1-based) of assigned gt
code: def __init__(self, scale=4, pos_num=3):
      self.scale = scale
      self.pos_num = pos_num
  
file_path: insightface/detection/scrfd/mmdet/core/bbox/assigners/point_assigner.py
imports: import torch
  from ..builder import BBOX_ASSIGNERS
  from .assign_result import AssignResult
  from .base_assigner import BaseAssigner
label_desc: Use image node_id 1 to create a new PointAssigner object from inherited base classes: BaseAssigner with example: obj = PointAssigner(scale, pos_num)