code: def test_gather(self):
      def func(x):
          return x[0]
  
      x = torch.rand(10, dtype=torch.float, requires_grad=True)
      self.checkScript(func, [x], optimize=True)
  
imports: import os
  import sys
  import tempfile
  import random
  from textwrap import dedent
  import torch
  from torch.testing._internal.jit_utils import JitTestCase, execWrapper
label_desc: Use image node_id 7 for calling the TestPythonBuiltinOP obj's underlying member method code with example usage: obj.test_gather() and returns: x