code: def get_angle(v1: Tensor, v2: Tensor) -> Tensor:
      return torch.atan2(
          torch.cross(v1, v2, dim=1).norm(p=2, dim=1),
          (v1 * v2).sum(dim=1),
      )
  
file_path: pytorch_geometric/torch_geometric/nn/conv/ppf_conv.py
imports: from typing import Callable, Optional, Union
  import torch
  from torch import Tensor
  from torch_geometric.nn.conv import MessagePassing
  from torch_geometric.nn.inits import reset
  from torch_geometric.typing import Adj, OptTensor, PairOptTensor, PairTensor, SparseTensor, torch_sparse
  from torch_geometric.utils import add_self_loops, remove_self_loops
label_desc: Use image node_id 1 for calling a global function with example usage: get_angle(v1, v2) and returns: torch