code: def test_atan(self, X, gc, dc):
      self.assertTrigonometricChecks(
          "Atan", X, lambda x: (np.arctan(X),), gc, dc
      )
  
file_path: pytorch/caffe2/python/operator_test/trigonometric_op_test.py
imports: from caffe2.python import core
  from hypothesis import given, settings
  import caffe2.python.hypothesis_test_util
  import caffe2.python.serialized_test.serialized_test_util
  import numpy
  import unittest
label_desc: Use image node_id 3 for calling the TestTrigonometricOp obj's underlying member method code with example usage: obj.test_atan(X, gc, dc) without return types