class_docstr: Test Pipeline
class_docstr_tok: ["Test","Pipeline"]
code: def test_large_output(self):
      p = (
          Pipeline.input("a")
          .flat_map("a", "b", lambda x: x)
          .output("b")
      )
      self.assertEqual(len(p([1] * 10000).to_list()), 10000)
  
imports: import unittest
  from towhee.operator.nop import NOPNodeOperator
  from towhee.operator import PyOperator
  from towhee.runtime.pipeline import Pipeline
  from towhee.runtime.data_queue import Empty
  from towhee.runtime import ops, register
  from towhee.runtime.runtime_pipeline import RuntimePipeline
label_desc: Use image node_id 26 for calling the TestPipeline obj's underlying member method code with example usage: obj.test_large_output() without return types