megatron version requirement
State: closed | Pull request: no

```
Traceback (most recent call last):
  File "/user/panyinxu/workspace/NeMo-Aligner/examples/nlp/minicpm/train_minicpm3_4b_longrope_dpo.py", line 164, in <module>
    main()
  File "/user/panyinxu/workspace/NeMo/nemo/core/config/hydra_runner.py", line 129, in wrapper
    _run_hydra(
  File "/usr/local/lib/python3.10/dist-packages/hydra/_internal/utils.py", line 394, in _run_hydra
    _run_app(
  File "/usr/local/lib/python3.10/dist-packages/hydra/_internal/utils.py", line 457, in _run_app
    run_and_report(
  File "/usr/local/lib/python3.10/dist-packages/hydra/_internal/utils.py", line 223, in run_and_report
    raise ex
  File "/usr/local/lib/python3.10/dist-packages/hydra/_internal/utils.py", line 220, in run_and_report
    return func()
  File "/usr/local/lib/python3.10/dist-packages/hydra/_internal/utils.py", line 458, in <lambda>
    lambda: hydra.run(
  File "/usr/local/lib/python3.10/dist-packages/hydra/_internal/hydra.py", line 132, in run
    _ = ret.return_value
  File "/usr/local/lib/python3.10/dist-packages/hydra/core/utils.py", line 260, in return_value
    raise self._return_value
  File "/usr/local/lib/python3.10/dist-packages/hydra/core/utils.py", line 186, in run_job
    ret.return_value = task_function(task_cfg)
  File "/user/panyinxu/workspace/NeMo-Aligner/examples/nlp/minicpm/train_minicpm3_4b_longrope_dpo.py", line 56, in main
    ptl_model = load_from_nemo(
  File "/user/panyinxu/workspace/NeMo-Aligner/nemo_aligner/utils/utils.py", line 118, in load_from_nemo
    model = cls.restore_from(
  File "/user/panyinxu/workspace/NeMo/nemo/collections/nlp/models/nlp_model.py", line 493, in restore_from
    return super().restore_from(
  File "/user/panyinxu/workspace/NeMo/nemo/core/classes/modelPT.py", line 474, in restore_from
    instance = cls._save_restore_connector.restore_from(
  File "/user/panyinxu/workspace/NeMo-Aligner/nemo_aligner/utils/utils.py", line 56, in restore_from
    return super().restore_from(*args, replace_sharded_tensor_key=self.__replace_sharded_tensor_key, **kwargs)
  File "/user/panyinxu/workspace/NeMo/nemo/collections/nlp/parts/nlp_overrides.py", line 1304, in restore_from
    loaded_params = super().load_config_and_state_dict(
  File "/user/panyinxu/workspace/NeMo/nemo/core/connectors/save_restore_connector.py", line 182, in load_config_and_state_dict
    instance = calling_cls.from_config_dict(config=conf, trainer=trainer)
  File "/user/panyinxu/workspace/NeMo/nemo/core/classes/common.py", line 530, in from_config_dict
    raise e
  File "/user/panyinxu/workspace/NeMo/nemo/core/classes/common.py", line 522, in from_config_dict
    instance = cls(cfg=config, trainer=trainer)
  File "/user/panyinxu/workspace/NeMo-Aligner/nemo_aligner/models/nlp/gpt/megatron_gpt_dpo_model.py", line 54, in __init__
    super().__init__(cfg, trainer=trainer)
  File "/user/panyinxu/workspace/NeMo/nemo/collections/nlp/parts/mixins/nlp_adapter_mixins.py", line 88, in __init__
    super().__init__(*args, **kwargs)
  File "/user/panyinxu/workspace/NeMo/nemo/collections/nlp/models/language_modeling/megatron_gpt_model.py", line 402, in __init__
    self.model = build_model(
  File "/user/panyinxu/workspace/NeMo/nemo/collections/nlp/modules/common/megatron/build_model.py", line 90, in build_model
    model = model_provider_func(
  File "/user/panyinxu/workspace/NeMo/nemo/collections/nlp/models/language_modeling/megatron_gpt_model.py", line 484, in model_provider_func
    transformer_layer_spec=get_specs(
  File "/user/panyinxu/workspace/NeMo/nemo/collections/nlp/models/language_modeling/megatron_gpt_model.py", line 172, in get_specs
    "modelopt": get_gpt_layer_modelopt_spec(num_experts),
  File "/user/panyinxu/workspace/NeMo/nemo/collections/nlp/models/language_modeling/megatron/gpt_layer_modelopt_spec.py", line 50, in get_gpt_layer_modelopt_spec
    raise IMPORT_ERROR
  File "/user/panyinxu/workspace/NeMo/nemo/collections/nlp/models/language_modeling/megatron/gpt_layer_modelopt_spec.py", line 23, in <module>
    from megatron.core.transformer.moe.moe_layer import MoELayer, MoESubmodules
ImportError: cannot import name 'MoESubmodules' from 'megatron.core.transformer.moe.moe_layer' (/user/panyinxu/workspace/Megatron-LM/megatron/core/transformer/moe/moe_layer.py)
```

I am currently using NeMo==2.1.0 and NeMo-Aligner==0.6.0. It appears that there is an issue with Megatron version compatibility. Which version of Megatron do I need?