docstr: Test for get_unique_graph with FuncGraph.
docstr_tok: ["Test","for","get_unique_graph","with","FuncGraph","."]
code: def test_unique_graph_func_graph(self):
      """Test for get_unique_graph with FuncGraph."""
      outer = ops_lib.Graph()
      with outer.as_default():
          k1 = constant_op.constant(1)
          inner = func_graph.FuncGraph("inner")
          inner._graph_key = outer._graph_key
          with inner.as_default():
              k2 = constant_op.constant(2)
  
      unique_graph = op_selector.get_unique_graph([k1, k2])
      self.assertEqual(unique_graph._graph_key, inner._graph_key)
  
file_path: tensorflow-upstream/tensorflow/python/ops/op_selector_test.py
imports: from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import func_graph
  from tensorflow.python.framework import ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import op_selector
  from tensorflow.python.platform import test
label_desc: Use image node_id 4 for calling the SelectTest obj's underlying member method code with example usage: obj.test_unique_graph_func_graph() without return types