code: def relu(x):
      """Rectified Linear Unit function.
  
      .. math:: f(x)=\\max(0, x).
  
      Args:
          x (:class:`~chainer.Variable` or :ref:`ndarray`):
              Input variable. A :math:`(s_1, s_2, ..., s_N)`-shaped float array.
  
      Returns:
          ~chainer.Variable: Output variable. A
          :math:`(s_1, s_2, ..., s_N)`-shaped float array.
  
      .. admonition:: Example
  
          >>> x = np.array([[-1, 0], [2, -3], [-2, 1]], np.float32)
          >>> np.any(x < 0)
          True
          >>> y = F.relu(x)
          >>> np.any(y.array < 0)
          False
          >>> y.shape
          (3, 2)
  
      """
      (y,) = ReLU().apply((x,))
      return y
  
imports: import numpy
  import chainer
  from chainer.backends import cuda
  from chainer.backends import intel64
  from chainer import function_node
  from chainer import utils
  from chainer.utils import type_check
  import chainerx
label_desc: Use image node_id 1 for calling a global function with example usage: relu(x) and returns: y