Llama2 70B SFT with FSDP failing
@satheeshkatipomu What the tools you convert "Converted Llama2 70B base model checkpoint from huggingface to nemo format"? 
 I have used `convert_llama_hf_to_nemo.py` script to convert llama2 70B model from huggingface format to NeMo format. Here is the exact command
```
python3 -u /opt/NeMo/scripts/checkpoint_converters/convert_llama_hf_to_nemo.py --input_name_or_path=/workspace/llama2_models --output_path=/workspace/llama2_models/llama2-70b-base.nemo
``` This issue is stale because it has been open for 30 days with no activity. Remove stale label or comment or this will be closed in 7 days. This issue is stale because it has been open for 30 days with no activity. Remove stale label or comment or this will be closed in 7 days. This issue was closed because it has been inactive for 7 days since being marked as stale. Is there any solution to this issue?
**Unable to fine-tune Llama2 70B with FSDP**

I am trying to fine-tune Llama2 70B model on a dataset, with TP=4, PP=8 it is working fine. But with FSDP on 6 nodes it is failing with below error
```
File "/opt/NeMo/nemo/collections/nlp/parts/nlp_overrides.py", line 670, in setup_environment
    for p in self.model.parameters():
AttributeError: 'NoneType' object has no attribute 'parameters'
```

**Steps/Code to reproduce bug**
1. Converted Llama2 70B base model checkpoint from huggingface to nemo format
2. Started training on 6 nodes with the below config.
```
run:
  name: llama_dolly_ft_fsdp_n_6_tp_4_pp_1_ddp_1_gbs_512_mbs_1_llama2_70b
  time_limit: 3-04:00:00
  dependency: singleton
  convert_name: convert_nemo
  model_train_name: llama2_70b
  convert_dir: ~/Projects/NeMo/nemo_launcher/NeMo-Megatron-Launcher/launcher_scripts/results/llama2_70b/convert_nemo
  task_name: llama_dolly_ft_fsdp_n_6_tp_4_pp_1_ddp_1_gbs_512_mbs_1
  results_dir: ~/Projects/NeMo/nemo_launcher/NeMo-Megatron-Launcher/launcher_scripts/results/llama2_70b/llama_dolly_ft_fsdp_n_6_tp_4_pp_1_ddp_1_gbs_512_mbs_1
trainer:
  devices: 8
  accelerator: gpu
  num_nodes: 6
  precision: bf16
  logger: false
  enable_checkpointing: false
  use_distributed_sampler: false
  max_epochs: null
  max_steps: 13000
  log_every_n_steps: 10
  val_check_interval: 300
  gradient_clip_val: 1.0
exp_manager:
  explicit_log_dir: ~/Projects/NeMo/nemo_launcher/NeMo-Megatron-Launcher/launcher_scripts/results/llama2_70b/llama_dolly_ft_fsdp_n_6_tp_4_pp_1_ddp_1_gbs_512_mbs_1/results
  exp_dir: null
  name: megatron_llama_llama_dolly_ft_fsdp_n_6_tp_4_pp_1_ddp_1_gbs_512_mbs_1
  create_wandb_logger: false
  wandb_logger_kwargs:
    project: nemo_llama_llama_dolly_ft_fsdp_n_6_tp_4_pp_1_ddp_1_gbs_512_mbs_1
    name: llama_dolly_ft_fsdp_n_6_tp_4_pp_1_ddp_1_gbs_512_mbs_1_llama2_70b
  resume_if_exists: true
  resume_ignore_no_checkpoint: true
  create_checkpoint_callback: true
  checkpoint_callback_params:
    monitor: validation_loss
    save_top_k: 5
    mode: min
    save_nemo_on_train_end: true
    filename: megatron_gpt_sft--{validation_loss:.3f}-{step}-{consumed_samples}
    model_parallel_size: 4
    save_best_model: true
model:
  seed: 1234
  tensor_model_parallel_size: 4
  pipeline_model_parallel_size: 1
  global_batch_size: 528
  micro_batch_size: 1
  restore_from_path: /workspace/llama2_models
  resume_from_checkpoint: null
  save_nemo_on_validation_end: false
  sync_batch_comm: false
  megatron_amp_O2: false
  sequence_parallel: true
  activations_checkpoint_granularity: selective
  activations_checkpoint_method: uniform
  activations_checkpoint_num_layers: null
  answer_only_loss: true
  gradient_as_bucket_view: false
  seq_len_interpolation_factor: null
  use_flash_attention: true
  hidden_dropout: 0.1
  attention_dropout: 0.1
  ffn_dropout: 0.1
  fsdp: true
  fsdp_sharding_strategy: full
  fsdp_grad_reduce_dtype: bf16
  fsdp_sharded_checkpoint: false
  fsdp_use_orig_params: false
  peft:
    peft_scheme: null
    restore_from_path: null
    adapter_tuning:
      type: parallel_adapter
      adapter_dim: 32
      adapter_dropout: 0.0
      norm_position: pre
      column_init_method: xavier
      row_init_method: zero
      norm_type: mixedfusedlayernorm
      layer_selection: null
      weight_tying: false
      position_embedding_strategy: null
    lora_tuning:
      adapter_dim: 32
      adapter_dropout: 0.0
      column_init_method: xavier
      row_init_method: zero
      layer_selection: null
      weight_tying: false
      position_embedding_strategy: null
    p_tuning:
      virtual_tokens: 10
      bottleneck_dim: 1024
      embedding_dim: 1024
      init_std: 0.023
    ia3_tuning:
      layer_selection: null
  data:
    chat: false
    train_ds:
      file_names:
      - ~/Projects/data/training.jsonl
      global_batch_size: 528
      micro_batch_size: 1
      shuffle: false
      num_workers: 4
      pin_memory: true
      max_seq_length: 4096
      min_seq_length: 1
      drop_last: true
      concat_sampling_probabilities:
      - 1.0
      context_key: input
      label_key: output
      add_eos: true
      add_sep: false
      add_bos: true
      separate_prompt_and_response_with_newline: true
      truncation_field: context
      index_mapping_dir: null
      prompt_template: '{input} {output}'
    validation_ds:
      file_names:
      - ~/Projects/data/validation.jsonl
      names:
      - llama_dolly_ft_fsdp_n_6_tp_4_pp_1_ddp_1_gbs_512_mbs_1
      global_batch_size: 528
      micro_batch_size: 1
      shuffle: false
      num_workers: 4
      pin_memory: true
      max_seq_length: 4096
      min_seq_length: 1
      drop_last: true
      context_key: input
      label_key: output
      add_eos: true
      add_sep: false
      add_bos: true
      separate_prompt_and_response_with_newline: true
      write_predictions_to_file: false
      output_file_path_prefix: null
      truncation_field: context
      index_mapping_dir: null
      prompt_template: '{input} {output}'
      metric:
        name: loss
        average: null
        num_classes: null
    test_ds:
      file_names:
      - ~/Projects/data/test.jsonl
      names: null
      global_batch_size: 528
      micro_batch_size: 1
      shuffle: false
      num_workers: 4
      pin_memory: true
      max_seq_length: 4096
      min_seq_length: 1
      drop_last: true
      context_key: input
      label_key: output
      add_eos: true
      add_sep: false
      add_bos: true
      separate_prompt_and_response_with_newline: true
      write_predictions_to_file: false
      output_file_path_prefix: null
      truncation_field: context
      index_mapping_dir: null
      prompt_template: '{input} {output}'
      metric:
        name: loss
        average: null
        num_classes: null
  optim:
    name: fused_adam
    lr: 1.0e-06
    weight_decay: 0.1
    betas:
    - 0.9
    - 0.98
    sched:
      name: CosineAnnealing
      monitor: validation_loss
      min_lr: 1.0e-08
      warmup_steps: 1000
      last_epoch: -1
```


**Expected behavior**

Llama2 70B SFT works fine.


**Environment details**
Image: `nvcr.io/nvidia/nemo:24.03.01.framework`
Using slurm cluster.
