code: def unreduce(array, shape, axis, keepdims):
    
    unreducer = unreducers[type(array)]
    return unreducer(array, shape, axis, keepdims)
docs: Reverse summing over a dimension.
  
    Args:
      array: The array that was reduced.
      shape: The original shape of the array before reduction.
      axis: The axis or axes that were summed.
      keepdims: Whether these axes were kept as singleton axes.
  
    Returns:
      An array with axes broadcast to match the shape of the original array.