code: def selu(self, x, alpha=1, lmbda=1):
      return lmbda * np.where(x > 0, x, alpha * np.expm1(x))
  
imports: import pytest
  import numpy
  import theano.tensor
label_desc: Use image node_id 6 for calling the TestNonlinearities obj's underlying member method code with example usage: obj.selu(x, alpha, lmbda) and returns: unknown