code: def softplus_inv(y):
      return y + y.neg().expm1().neg().log()
  
file_path: pyro/pyro/distributions/transforms/softplus.py
imports: from torch.distributions import constraints
  from torch.distributions.transforms import Transform
  from torch.nn.functional import softplus
label_desc: Use image node_id 1 for calling a global function with example usage: softplus_inv(y) and returns: unknown