code: def test_tanh_fallback_expr():
      expr = ast.TanhExpr(ast.NumVal(2.0))
  
      interpreter = PythonInterpreter()
      interpreter.tanh_function_name = NotImplemented
  
      expected_code = """
  import math
  def score(input):
      var1 = 2.0
      if var1 > 44.0:
          var0 = 1.0
      else:
          if var1 < -44.0:
              var0 = -1.0
          else:
              var0 = 1.0 - 2.0 / (math.exp(2.0 * var1) + 1.0)
      return var0
  """
  
      assert_code_equal(interpreter.interpret(expr), expected_code)
  
file_path: m2cgen/tests/test_fallback_expressions.py
imports: import pytest
  from m2cgen import ast
  from m2cgen.interpreters import CInterpreter, PythonInterpreter
  from tests.utils import assert_code_equal
label_desc: Use image node_id 3 for calling a global function with example usage: test_tanh_fallback_expr() without return types