class_docstr: Linked list structure with list of VectorNodes as elements.
class_docstr_tok: ["Linked","list","structure","with","list","of","VectorNodes","as","elements","."]
code: def chain_length(self, index: int) -> int:
      length = sum(1 for _ in self.iterate(index))
      return length
  
imports: import typing
  import numpy
label_desc: Use image node_id 6 for calling the VectorLinkedList obj's underlying member method code with example usage: obj.chain_length(index) and returns: length