Image-Text-to-Text
Transformers
TensorBoard
Safetensors
gemma4
Generated from Trainer
conversational

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Built with Axolotl

See axolotl config

axolotl version: 0.19.0.dev0

# 4 節點 × 8 張 H100,全參數 FSDP2。clean 版資料,純 SFT。
# 從 train-clean.yml 改來,只拿掉 EAFT。由 train-clean-noeaft.sbatch 送出。
# 不要改 train-clean.yml,那份是 EAFT(alpha 0.333)的對照。
# 不要在登入節點跑 preprocess 或 train。
# global batch = 32 * micro_batch_size * gradient_accumulation_steps。
# output 跟 train-clean.yml 分開,避免蓋到 gemma4-26b-fft-clean。
# 資料、長度、packing 跟 clean 65536 一樣,preprocess 可沿用那份 cache。
base_model: google/gemma-4-26B-A4B-it

# Gemma 4 權重是 Gemma4ForConditionalGeneration,不要強制 AutoModelForCausalLM。
# 這次是文字 SFT,凍結 vision / audio tower。
freeze_mm_modules: true

plugins:
  - axolotl.integrations.liger.LigerPlugin
  - axolotl.integrations.cut_cross_entropy.CutCrossEntropyPlugin

liger_rope: true
liger_rms_norm: true
liger_glu_activation: true
liger_layer_norm: true
# multimodal Gemma 4 的 liger 沒有 fused linear CE。
liger_fused_linear_cross_entropy: false
# 純交叉熵。CCE 不物化整段 logits,並套用 final_logit_softcapping=30。
# 65536 × vocab 262144 的 bf16 logits 約 32GiB,跟 EAFT 那次的佔用加起來放不進 H100。
# 容器的 fused EAFT 沒有 softcap。這次和 train-clean.yml 的差別是 entropy 加權,以及 softcap。
# 不要跟 use_eaft 同時開。
cut_cross_entropy: true
use_eaft: false

# 全參數。不要加 adapter、4bit、quantize_moe_experts。
load_in_8bit: false
load_in_4bit: false

datasets:
  - path: data/ultradata-sft-clean.jsonl
    type: input_output
  - path: data/ultradata-sft-agent-clean.jsonl
    type: input_output
  - path: data/tw-sft-clean.jsonl
    type: input_output

dataset_prepared_path: ./prepared/gemma4-26b-fft-clean-65536
output_dir: ./outputs/gemma4-26b-fft-clean-noeaft
dataset_num_proc: 64
train_on_inputs: false
val_set_size: 0
seed: 42

# 跟 train-clean.yml 相同:65536、gradient_accumulation_steps 1。
# 超過這個長度的樣本,Axolotl preprocess 會丟掉。
sequence_len: 65536
sample_packing: true
eval_sample_packing: false
pad_to_sequence_len: true

wandb_project:
wandb_entity:
wandb_watch:
wandb_name:
wandb_log_model:

use_tensorboard: true

# 32 張 H100。global batch = 32 * 1 * 1 * 65536 = 2,097,152 tokens。
gradient_accumulation_steps: 1
micro_batch_size: 1
num_epochs: 2

optimizer: adamw_torch_fused
learning_rate: 5.0e-6
lr_scheduler: cosine
warmup_ratio: 0.03
weight_decay: 0.01
max_grad_norm: 1.0

bf16: auto
tf32: true

gradient_checkpointing: true
gradient_checkpointing_kwargs:
  use_reentrant: false
# 183274 打開後,backward 仍是已佔 72.23GiB 再要 5.50GiB。這段 workspace 沒被 offload 移走。
activation_offloading: false

# FSDP2 把參數、梯度、optimizer state 切到 32 張卡。
# 必須包文字 decoder。不指定時 FSDP 會去找不存在的 Gemma4AudioLayer。
# 存檔用 FULL_STATE_DICT,集中成一份權重。不寫 optimizer state,不能從 optimizer 續訓。
fsdp_version: 2
fsdp_config:
  offload_params: false
  cpu_ram_efficient_loading: true
  auto_wrap_policy: TRANSFORMER_BASED_WRAP
  transformer_layer_cls_to_wrap: Gemma4TextDecoderLayer
  state_dict_type: FULL_STATE_DICT
  reshard_after_forward: true

# flex attention。全域層 head_dim=512,FA2 單獨跑不了。
# 參數照 MEGA/train.yml。H100 預設 flex 會 SRAM OOM。
attn_implementation: flex_attention
flex_attn_kernel_options:
  num_stages: 1
  bwd_num_stages: 1

logging_steps: 1
saves_per_epoch: 1
save_total_limit: 2
# 只存模型參數。optimizer、scheduler、rng 都不寫進 checkpoint。
save_only_model: true

special_tokens:
  bos_token: "<bos>"
  eos_token: "<eos>"
  pad_token: "<pad>"
  unk_token: "<unk>"

# preprocess --debug 若把要學的 <turn|> 標成 -100,拿掉這段。
eot_tokens:
  - "<turn|>"

outputs/gemma4-26b-fft-clean-noeaft

This model is a fine-tuned version of google/gemma-4-26B-A4B-it on the data/ultradata-sft-clean.jsonl, the data/ultradata-sft-agent-clean.jsonl and the data/tw-sft-clean.jsonl datasets.

Model description

More information needed

Intended uses & limitations

More information needed

Training and evaluation data

More information needed

Training procedure

Training hyperparameters

The following hyperparameters were used during training:

  • learning_rate: 5e-06
  • train_batch_size: 1
  • eval_batch_size: 1
  • seed: 42
  • distributed_type: multi-GPU
  • num_devices: 32
  • total_train_batch_size: 32
  • total_eval_batch_size: 32
  • optimizer: Use OptimizerNames.ADAMW_TORCH_FUSED with betas=(0.9,0.999) and epsilon=1e-08 and optimizer_args=No additional optimizer arguments
  • lr_scheduler_type: cosine
  • lr_scheduler_warmup_steps: 21
  • training_steps: 712

Training results

Framework versions

  • Transformers 5.14.1
  • Pytorch 2.11.0+cu130
  • Datasets 4.8.4
  • Tokenizers 0.22.2
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