class_docstr: Centers node positions :obj:`data.pos` around the origin
  (functional name: :obj:`center`).
code: def forward(
      self,
      data: Union[Data, HeteroData],
  ) -> Union[Data, HeteroData]:
      for store in data.node_stores:
          if hasattr(store, "pos"):
              store.pos = store.pos - store.pos.mean(
                  dim=-2, keepdim=True
              )
      return data
  
imports: from typing import Union
  from torch_geometric.data import Data, HeteroData
  from torch_geometric.data.datapipes import functional_transform
  from torch_geometric.transforms import BaseTransform
label_desc: Use image node_id 1 for calling the Center obj's underlying member method code with example usage: obj.forward(data) and returns: data