code: def __call__(self, t, y):
      self.nfe += 1
      return self.diffeq(t, y)
  
file_path: torchdiffeq/tests/DETEST/run.py
imports: import time
  import numpy
  from scipy.stats.mstats import gmean
  import torch
  from torchdiffeq import odeint
  import detest
label_desc: Use image node_id 2 for calling the NFEDiffEq obj's underlying member method code with example usage: obj.__call__(t, y) and returns: self