code: def test_output_format_while():
      class TestLayer1(gluon.HybridBlock):
          def __init__(self, step, use_list, nested_list=False):
              super(TestLayer1, self).__init__()
              self.step = step
              self.use_list = use_list
              self.nested_list = nested_list
  
          def forward(self, states):
              def cond(state1):
                  scalar = mx.npx.slice(state1, begin=0, end=1)
                  return scalar == scalar
  
              cond_func = cond
              if self.use_list:
                  states = [states]
              elif self.nested_list:
  
                  def cond2(state1, state2):
                      scalar = mx.npx.slice(state1, begin=0, end=1)
                      return scalar == scalar
  
                  cond_func = cond2
                  states = [states, [states + 1]]
              out, states = mx.npx.while_loop(
                  cond_func, self.step, states, max_iterations=5
              )
              return out, states
  
      def step1(state):
          return state, state
  
      def step2(state):
          if isinstance(state, list):
              return state, state
          else:
              return [state], state
  
      def step3(state):
          return [], state
  
      steps = [step1, step2, step3]
      state = mx.np.random.normal(loc=0, scale=1, size=(2))
      for step in steps:
          layer1 = TestLayer1(step, False)
          layer1.initialize(device=default_device())
          layer2 = TestLayer1(step, False)
          layer2.initialize(device=default_device())
          layer2.hybridize()
          out1, state1 = layer1(state)
          out2, state2 = layer2(state)
          assert type(out1) == type(out2)
          assert type(state1) == type(state1)
          out1 = _as_list(out1)
          out2 = _as_list(out2)
          state1 = _as_list(state1)
          state2 = _as_list(state2)
          for i in range(len(out1)):
              assert_almost_equal(
                  out1[i].asnumpy(),
                  out2[i].asnumpy(),
                  rtol=0.001,
                  atol=0.0001,
              )
          for i in range(len(state1)):
              assert_almost_equal(
                  state1[i].asnumpy(),
                  state2[i].asnumpy(),
                  rtol=0.001,
                  atol=0.0001,
              )
  
          layer1 = TestLayer1(step, True)
          layer1.initialize(device=default_device())
          layer2 = TestLayer1(step, True)
          layer2.initialize(device=default_device())
          layer2.hybridize()
          out1, state1 = layer1(state)
          out2, state2 = layer2(state)
          assert type(out1) == type(out2)
          assert type(state1) == type(state2)
          out1 = _as_list(out1)
          out2 = _as_list(out2)
          state1 = _as_list(state1)
          state2 = _as_list(state2)
          for i in range(len(out1)):
              assert_almost_equal(
                  out1[i].asnumpy(),
                  out2[i].asnumpy(),
                  rtol=0.001,
                  atol=0.0001,
              )
          for i in range(len(state1)):
              assert_almost_equal(
                  state1[i].asnumpy(),
                  state2[i].asnumpy(),
                  rtol=0.001,
                  atol=0.0001,
              )
  
      def step4(state, state2):
          states = _as_list(state)
          states.append(state2)
          return state, states
  
      def step5(state, state2):
          states = _as_list(state)
          states.append(state2)
          if isinstance(state, list):
              return state, states
          else:
              return [state], states
  
      def step6(state, state2):
          states = _as_list(state)
          states.append(state2)
          return [], states
  
      steps = [step4, step5, step6]
      for step in steps:
          layer1 = TestLayer1(step, False, True)
          layer1.initialize(device=default_device())
          layer2 = TestLayer1(step, False, True)
          layer2.initialize(device=default_device())
          layer2.hybridize()
          out1, state1 = layer1(state)
          out2, state2 = layer2(state)
          assert type(out1) == type(out2)
          assert type(state1) == type(state2)
          out1 = _as_list(out1)
          out2 = _as_list(out2)
          state1 = _as_list(state1)
          state2 = _as_list(state2)
          for i in range(len(out1)):
              assert_almost_equal(
                  out1[i].asnumpy(),
                  out2[i].asnumpy(),
                  rtol=0.001,
                  atol=0.0001,
              )
          for i in range(len(state1)):
              if not isinstance(state1[i], list):
                  assert_almost_equal(
                      state1[i].asnumpy(),
                      state2[i].asnumpy(),
                      rtol=0.001,
                      atol=0.0001,
                  )
  
imports: import copy
  import numpy
  import mxnet
  from mxnet import gluon
  from mxnet.test_utils import *
  from mxnet.base import _as_list
  from collections import defaultdict
  from mxnet.attribute import AttrScope
label_desc: Use image node_id 7 for calling a global function with example usage: test_output_format_while() and returns: state,  state, list,  state, state,  states, list,  states, out,  states, state,  state, list,  state, state,  states, list,  states, unknown, unknown