code: def _pass_through_h(h, _):
      # Declared here for torchscript
      return h
  
imports: from typing import List, Optional
  import torch
  import torch.nn
  import torch.nn.functional
  from torch import Tensor
  from torch.nn.modules.batchnorm import BatchNorm2d
  from torch.nn.modules.instancenorm import InstanceNorm2d
  from torchvision.ops import Conv2dNormActivation
  from ...transforms._presets import OpticalFlow
  from ...utils import _log_api_usage_once
  from .._api import register_model, Weights, WeightsEnum
  from .._utils import handle_legacy_interface
  from ._utils import grid_sample, make_coords_grid, upsample_flow
label_desc: Use image node_id 1 for calling a global function with example usage: _pass_through_h(h, _) and returns: h