class_docstr: ArcFace (https://arxiv.org/pdf/1801.07698v1.pdf):
      
code: def __init__(self, s=64.0, margin=0.5):
      super(ArcFace, self).__init__()
      self.s = s
      self.margin = margin
      self.cos_m = math.cos(margin)
      self.sin_m = math.sin(margin)
      self.theta = math.cos(math.pi - margin)
      self.sinmm = math.sin(math.pi - margin) * margin
      self.easy_margin = False
  
file_path: insightface/recognition/arcface_torch/losses.py
imports: import torch
  import math
label_desc: Use image node_id 1 to create a new ArcFace object from inherited base classes: torch.nn with example: obj = ArcFace(s, margin)