code: def _covector(self, x):
      return x
  
imports: from itertools import count
  from functools import reduce
  from .tracer import trace, primitive, toposort, Node, Box, isbox, getval
  from .util import func, subval
  import warnings
label_desc: Use image node_id 15 for calling the VSpace obj's underlying member method code with example usage: obj._covector(x) and returns: x