chore: import upstream snapshot with attribution

examples/megatron/dense/72b_offload.sh

@@ -0,0 +1,36 @@
+# 8 * 65GiB. 80s/it
+PYTORCH_CUDA_ALLOC_CONF='expandable_segments:True' \
+NPROC_PER_NODE=8 \
+CUDA_VISIBLE_DEVICES=0,1,2,3,4,5,6,7 \
+megatron sft \
+    --model Qwen/Qwen2.5-72B-Instruct \
+    --save_safetensors true \
+    --dataset 'liucong/Chinese-DeepSeek-R1-Distill-data-110k-SFT' \
+    --load_from_cache_file true \
+    --split_dataset_ratio 0.01 \
+    --tensor_model_parallel_size 8 \
+    --micro_batch_size 1 \
+    --global_batch_size 16 \
+    --packing true \
+    --recompute_granularity full \
+    --recompute_method uniform \
+    --recompute_num_layers 1 \
+    --num_train_epochs 5 \
+    --finetune true \
+    --cross_entropy_loss_fusion true \
+    --lr 1e-5 \
+    --lr_warmup_fraction 0.05 \
+    --min_lr 1e-6 \
+    --output_dir megatron_output/Qwen2.5-72B-Instruct \
+    --eval_steps 500 \
+    --save_steps 500 \
+    --max_length 8192 \
+    --dataloader_num_workers 8 \
+    --dataset_num_proc 8 \
+    --no_save_optim true \
+    --no_save_rng true \
+    --sequence_parallel true \
+    --optimizer_cpu_offload true \
+    --use_precision_aware_optimizer true \
+    --optimizer_offload_fraction 1 \
+    --attention_backend flash

examples/megatron/dense/qwen3_32b.sh

@@ -0,0 +1,33 @@
+# 8 * 80GiB
+PYTORCH_CUDA_ALLOC_CONF='expandable_segments:True' \
+NPROC_PER_NODE=8 \
+CUDA_VISIBLE_DEVICES=0,1,2,3,4,5,6,7 \
+megatron sft \
+    --model Qwen/Qwen3-32B \
+    --save_safetensors true \
+    --dataset 'liucong/Chinese-DeepSeek-R1-Distill-data-110k-SFT' \
+    --load_from_cache_file true \
+    --split_dataset_ratio 0.01 \
+    --tensor_model_parallel_size 8 \
+    --micro_batch_size 1 \
+    --global_batch_size 16 \
+    --packing true \
+    --recompute_granularity full \
+    --recompute_method uniform \
+    --recompute_num_layers 1 \
+    --num_train_epochs 5 \
+    --finetune true \
+    --cross_entropy_loss_fusion true \
+    --lr 1e-5 \
+    --lr_warmup_fraction 0.05 \
+    --min_lr 1e-6 \
+    --output_dir megatron_output/Qwen3-32B \
+    --eval_steps 500 \
+    --save_steps 500 \
+    --max_length 8192 \
+    --dataloader_num_workers 8 \
+    --dataset_num_proc 8 \
+    --no_save_optim true \
+    --no_save_rng true \
+    --sequence_parallel true \
+    --attention_backend flash