class_docstr: Scaled Exponential Linear Unit (SELU)
      "Self-Normalizing Neural Networks", Klambauer et al, 2017
      https://arxiv.org/abs/1706.02515
  
  
  Inputs:
      - **data**: input tensor with arbitrary shape.
  
  Outputs:
      - **out**: output tensor with the same shape as `data`.
code: def forward(self, x):
      return npx.leaky_relu(x, act_type="selu", name="fwd")
  
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 2 for calling the SELU obj's underlying member method code with example usage: obj.forward(x) and returns: npx