code: def logit(p):
      return p.log() - (-p).log1p()
  
imports: import logging
  import pytest
  import torch
  from torch.autograd import grad
  import pyro
  import pyro.distributions
  from pyro.contrib.tracking.assignment import MarginalAssignment, MarginalAssignmentPersistent, MarginalAssignmentSparse
  from tests.common import assert_equal
label_desc: Use image node_id 2 for calling a global function with example usage: logit(p) and returns: unknown