code: def prepend_none(t):
      return (None,) + t
  
file_path: spektral/spektral/data/utils.py
imports: import numpy
  import tensorflow
  from scipy import sparse
  from spektral.utils import pad_jagged_array
  from spektral.utils.sparse import sp_matrix_to_sp_tensor
label_desc: Use image node_id 7 for calling a global function with example usage: prepend_none(t) and returns: unknown