code: def value_and_grad(func, argnums=0, to_numpy=False):
      """Wrap autograd value_and_grad function.
  
      Parameters
      ----------
      func : callable
          Function whose value and gradient values
          will be computed.
      to_numpy : bool
          Unused. Here for API consistency.
  
      Returns
      -------
      value_and_grad : callable
          Function that returns func's value and
          func's gradients' values at its inputs args.
      """
  
      def _value_and_grad(*x, **kwargs):
          if not hasattr(x[0], "ndim") or x[0].ndim < 2:
              return _autograd.value_and_grad(func, argnum=argnums)(
                  *x, **kwargs
              )
          return _elementwise_value_and_grad(func, argnum=argnums)(
              *x, **kwargs
          )
  
      return _value_and_grad
  
file_path: geomstats/geomstats/_backend/autograd/autodiff.py
imports: import autograd
  import autograd.numpy
  from autograd import jacobian
label_desc: Use image node_id 4 for calling a global function with example usage: value_and_grad(func, argnums, to_numpy) and returns: _value_and_grad, _elementwise_value_and_grad, _autograd