code: def domain_map(self, F, alpha_vector):
      # apply softplus to the elements of alpha vector
      alpha = F.Activation(alpha_vector, act_type="softrelu")
      return alpha
  
imports: from typing import List, Optional, Tuple, Type
  import numpy
  from gluonts.core.component import validated
  from gluonts.mx import Tensor
  from gluonts.mx.util import make_nd_diag
  from .distribution import Distribution, _sample_multiple, getF
  from .distribution_output import DistributionOutput
label_desc: Use image node_id 3 for calling the DirichletOutput obj's underlying member method code with example usage: obj.domain_map(F, alpha_vector) and returns: alpha