trlx/configs/nemo_configs/megatron_65b.yaml

name: megatron_gpt
restore_from_path: null  # used when starting from a .nemo file

trainer:
  devices: 8
  num_nodes: 16
  accelerator: gpu
  precision: bf16
  logger: False # logger provided by exp_manager
  enable_checkpointing: False
  replace_sampler_ddp: False
  max_epochs: -1 # PTL default. In practice, max_steps will be reached first.
  max_steps: 1000 # consumed_samples = global_step * micro_batch_size * data_parallel_size * accumulate_grad_batches
  log_every_n_steps: 1
  val_check_interval: 10
  limit_val_batches: 0.0
  limit_test_batches: 500
  accumulate_grad_batches: 1 # do not modify, grad acc is automatic for training megatron models
  gradient_clip_val: 1.0
  benchmark: False

exp_manager:
  explicit_log_dir: null
  exp_dir: null
  name: megatron_gpt_70b
  create_wandb_logger: True
  wandb_logger_kwargs:
    project: trlx
    name: ilql_sentiments_70b
  resume_if_exists: True
  resume_ignore_no_checkpoint: True
  create_checkpoint_callback: False
  checkpoint_callback_params:
    monitor: val_loss
    save_top_k: 1
    mode: min
    always_save_nemo: False # saves nemo file during validation, not implemented for model parallel
    save_nemo_on_train_end: False # not recommended when training large models on clusters with short time limits
    filename: 'megatron_gpt--{val_loss:.2f}-{step}-{consumed_samples}'
    model_parallel_size: ${multiply:${model.tensor_model_parallel_size}, ${model.pipeline_model_parallel_size}}
  log_step_timing: True
  step_timing_kwargs:
    sync_cuda: True
    buffer_size: 5

model:
  micro_batch_size: 8
  global_batch_size: 128 #2048
  tensor_model_parallel_size: 8
  pipeline_model_parallel_size: 4 #2
  resume_from_checkpoint: null # manually set the checkpoint file to load from

  # model architecture
  encoder_seq_length: 2048
  max_position_embeddings: 2048
  num_layers: 80
  hidden_size: 8192
  ffn_hidden_size: ${multiply:4, ${.hidden_size}}  # Transformer FFN hidden size. 4 * hidden_size.
  num_attention_heads: 128
  init_method_std: 0.007  # Standard deviation of the zero mean normal distribution used for weight initialization.')
  hidden_dropout: 0.1  # Dropout probability for hidden state transformer.
  kv_channels: null  # Projection weights dimension in multi-head attention. Set to hidden_size // num_attention_heads if null
  apply_query_key_layer_scaling: True # scale Q * K^T by 1 / layer-number.
  layernorm_epsilon: 1e-5
  make_vocab_size_divisible_by: 128 # Pad the vocab size to be divisible by this value for computation efficiency.
  pre_process: True # add embedding
  post_process: True # add pooler
  persist_layer_norm: True # Use of persistent fused layer norm kernel.
  grad_div_ar_fusion: True # Fuse grad division into torch.distributed.all_reduce
  gradient_accumulation_fusion: True # Fuse weight gradient accumulation to GEMMs

  sync_batch_comm: True

  ## Activation Checkpointing
  activations_checkpoint_granularity: 'selective'  # 'selective' or 'full'
  activations_checkpoint_method: 'uniform' # 'block' # 'uniform', 'block', not used with 'selective'
  activations_checkpoint_num_layers: 1 # 2 # not used with 'selective'

  ## Sequence Parallelism
  sequence_parallel: True

  tokenizer:
    library: 'megatron'
    type: 'GPT2BPETokenizer'
    model: null
    vocab_file: null
    merge_file: null
    delimiter: null # only used for tabular tokenizer
    sentencepiece_legacy: false # Legacy=True allows you to add special tokens to sentencepiece tokenizers.

  # precision
  native_amp_init_scale: 4294967296 # 2 ** 32
  native_amp_growth_interval: 1000
  hysteresis: 2 # Gradient scale hysteresis
  fp32_residual_connection: False # Move residual connections to fp32
  fp16_lm_cross_entropy: False # Move the cross entropy unreduced loss calculation for lm head to fp16

  # Megatron O2-style half-precision
  megatron_amp_O2: False # Enable O2-level automatic mixed precision using main parameters
  grad_allreduce_chunk_size_mb: 125

  # miscellaneous
  seed: 1234
  use_cpu_initialization: False # Init weights on the CPU (slow for large models)
  onnx_safe: False # Use work-arounds for known problems with Torch ONNX exporter.
  apex_transformer_log_level: 30 # Python logging level displays logs with severity greater than or equal to this
  gradient_as_bucket_view: True # PyTorch DDP argument. Allocate gradients in a contiguous bucket to save memory (less fragmentation and buffer memory)

  data:
    # Path to data must be specified by the user.
    # can override from the CLI: "model.data.data_prefix=[.5,/raid/data/pile/my-gpt3_00_text_document,.5,/raid/data/pile/my-gpt3_01_text_document]",
    # Or see example below:
    # data_prefix:
    #   - .5
    #   - /raid/data/pile/my-gpt3_00_text_document
    #   - .5
    #   - /raid/data/pile/my-gpt3_01_text_document
    data_prefix:
      ignored: ignored
    index_mapping_dir: null # path to save index mapping .npy files, by default will save in the same location as data_prefix
    data_impl: mmap
    splits_string: 900,50,50
    seq_length: ${model.encoder_seq_length}
    skip_warmup: True
    num_workers: 2
    dataloader_type: single # cyclic
    reset_position_ids: False # Reset position ids after end-of-document token
    reset_attention_mask: False # Reset attention mask after end-of-document token
    eod_mask_loss: False # Mask loss for the end of document tokens

  # Nsys profiling options
  nsys_profile:
    enabled: False
    start_step: 10  # Global batch to start profiling
    end_step: 10 # Global batch to end profiling
    ranks: [0, 4, 8, 12] # Global rank IDs to profile
    gen_shape: False # Generate model and kernel details including input shapes

  optim:
    name: distributed_fused_adam
    lr: 1.1e-4
    weight_decay: 0.1
    betas:
    - 0.9
    - 0.95
    sched:
      name: CosineAnnealing
      warmup_steps: 115
      constant_steps: 12500
      min_lr: 1.1e-5