class_docstr: MobileNetV1
  
  MobileNetV1 Backbone for RetinaFace.
code: def forward(self, x: torch.FloatTensor):
      x = self.stage1(x)
      x = self.stage2(x)
      x = self.stage3(x)
      x = self.avg(x)
      # x = self.model(x)
      x = x.view(-1, 256)
      x = self.fc(x)
      return x
  
imports: import torch
  from torch import nn
  from towhee.models.retina_face.utils import conv_dw, conv_bn
label_desc: Use image node_id 2 for calling the MobileNetV1 obj's underlying member method code with example usage: obj.forward(x) and returns: x