code: def arctan(x, out=None, where=None, **kwargs):
      """
      Trigonometric inverse tangent, element-wise.
  
      The inverse of tan, so that if ``y = tan(x)`` then ``x = arctan(y)``.
  
      Parameters
      ----------
      x : array_like
      out : Tensor, None, or tuple of Tensor and None, optional
          A location into which the result is stored. If provided, it must have
          a shape that the inputs broadcast to. If not provided or `None`,
          a freshly-allocated tensor is returned. A tuple (possible only as a
          keyword argument) must have length equal to the number of outputs.
      where : array_like, optional
          Values of True indicate to calculate the ufunc at that position, values
          of False indicate to leave the value in the output alone.
      **kwargs
  
      Returns
      -------
      out : Tensor
          Out has the same shape as `x`.  Its real part is in
          ``[-pi/2, pi/2]`` (``arctan(+/-inf)`` returns ``+/-pi/2``).
          It is a scalar if `x` is a scalar.
  
      See Also
      --------
      arctan2 : The "four quadrant" arctan of the angle formed by (`x`, `y`)
          and the positive `x`-axis.
      angle : Argument of complex values.
  
      Notes
      -----
      `arctan` is a multi-valued function: for each `x` there are infinitely
      many numbers `z` such that tan(`z`) = `x`.  The convention is to return
      the angle `z` whose real part lies in [-pi/2, pi/2].
  
      For real-valued input data types, `arctan` always returns real output.
      For each value that cannot be expressed as a real number or infinity,
      it yields ``nan`` and sets the `invalid` floating point error flag.
  
      For complex-valued input, `arctan` is a complex analytic function that
      has [`1j, infj`] and [`-1j, -infj`] as branch cuts, and is continuous
      from the left on the former and from the right on the latter.
  
      The inverse tangent is also known as `atan` or tan^{-1}.
  
      References
      ----------
      Abramowitz, M. and Stegun, I. A., *Handbook of Mathematical Functions*,
      10th printing, New York: Dover, 1964, pp. 79.
      http://www.math.sfu.ca/~cbm/aands/
  
      Examples
      --------
      We expect the arctan of 0 to be 0, and of 1 to be pi/4:
      >>> import mars.tensor as mt
  
      >>> mt.arctan([0, 1]).execute()
      array([ 0.        ,  0.78539816])
  
      >>> mt.pi/4
      0.78539816339744828
  
      Plot arctan:
  
      >>> import matplotlib.pyplot as plt
      >>> x = mt.linspace(-10, 10)
      >>> plt.plot(x.execute(), mt.arctan(x).execute())
      >>> plt.axis('tight')
      >>> plt.show()
      """
      op = TensorArctan(**kwargs)
      return op(x, out=out, where=where)
  
file_path: mars/mars/tensor/arithmetic/arctan.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: arctan(x, out, where) and returns: op