code: def forward(self, x):
      return self.head(self.backbone(x))
  
imports: import math
  from tinygrad.helpers import flatten, get_child
  import tinygrad.nn
  from extra.models.resnet import ResNet
  import numpy
label_desc: Use image node_id 3 for calling the RetinaNet obj's underlying member method code with example usage: obj.forward(x) and returns: self