docstr: Inputs (gradients) to layers in the backward pass as a :class:`ValueCollection`
docstr_tok: ["Inputs","(","gradients",")","to","layers","in","the","backward","pass","as","a",":","class",":","`","ValueCollection","`"]
code: def backward_input(self):
      """
      Inputs (gradients) to layers in the backward pass as a :class:`ValueCollection`
      """
      return ValueCollection(
          self._backward_input,
          sort_keys(list(self._backward_input.keys())),
      )
  
imports: from typing import Callable, Dict, List, TYPE_CHECKING
  from labml.internal.util.strings import is_pattern_match
label_desc: Use image node_id 7 for calling the ModelProbe obj's underlying member method code with example usage: obj.backward_input() and returns: ValueCollection