class_docstr: Applies an activation function to input.
  
  Parameters
  ----------
  activation : str
      Name of activation function to use.
      See :func:`~mxnet.ndarray.Activation` for available choices.
  
  
  Inputs:
      - **data**: input tensor with arbitrary shape.
  
  Outputs:
      - **out**: output tensor with the same shape as `data`.
code: def __init__(self, activation, **kwargs):
      self._act_type = activation
      super(Activation, self).__init__(**kwargs)
  
imports: from ...None import initializer, npx
  from ..block import HybridBlock
  from ..parameter import Parameter
  from ...util import use_np
label_desc: Use image node_id 1 to create a new Activation object from inherited base classes: HybridBlock with example: obj = Activation(activation)