code: def rel_error(true, estimate):
      return ((true - estimate) / true).abs().max()
  
file_path: torchdiffeq/tests/event_tests.py
imports: import unittest
  import torch
  import torchdiffeq
  from problems import construct_problem, DTYPES, DEVICES, METHODS, FIXED_METHODS
label_desc: Use image node_id 1 for calling a global function with example usage: rel_error(true, estimate) and returns: unknown