code: def positive(x, out=None, where=None, **kwargs):
      """
      Numerical positive, element-wise.
  
      Parameters
      ----------
      x : array_like or scalar
          Input tensor.
  
      Returns
      -------
      y : Tensor or scalar
          Returned array or scalar: `y = +x`.
      """
      op = TensorPositive(**kwargs)
      return op(x, out=out, where=where)
  
file_path: mars/mars/tensor/arithmetic/positive.py
imports: import numpy
  from ...None import opcodes
  from ..utils import infer_dtype
  from .core import TensorUnaryOp
  from .utils import arithmetic_operand
label_desc: Use image node_id 1 for calling a global function with example usage: positive(x, out, where) and returns: op