code: def __call__(self, df):
      return torch.from_numpy(df.values).view(-1, 1).to(self.dtype)
  
file_path: pytorch_geometric/examples/hetero/load_csv.py
imports: import os.path
  import pandas
  import torch
  from sentence_transformers import SentenceTransformer
  from torch_geometric.data import HeteroData, download_url, extract_zip
  from torch_geometric.transforms import RandomLinkSplit, ToUndirected
label_desc: Use image node_id 2 for calling the IdentityEncoder obj's underlying member method code with example usage: obj.__call__(df) and returns: torch