code: def forward_teacher(self, x):
      y = self.teacher_backbone(x).flatten(start_dim=1)
      z = self.teacher_head(y)
      return z
  
file_path: lightly/examples/pytorch/dino.py
imports: import copy
  import torch
  import torchvision
  from torch import nn
  from lightly.loss import DINOLoss
  from lightly.models.modules import DINOProjectionHead
  from lightly.models.utils import deactivate_requires_grad, update_momentum
  from lightly.transforms.dino_transform import DINOTransform
  from lightly.utils.scheduler import cosine_schedule
label_desc: Use image node_id 3 for calling the DINO obj's underlying member method code with example usage: obj.forward_teacher(x) and returns: z