add examples

Former-commit-id: 2744dc9d2f9df4150a496b38e24ea96040a85bef

examples/lora_single_gpu/README.md

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+Usage:
+
+- `pretrain.sh`
+- `sft.sh` -> `reward.sh` -> `ppo.sh`
+- `sft.sh` -> `dpo.sh` -> `predict.sh`

examples/merge_lora/README.md

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+Usage:
+
+- `merge.sh` -> `quantize.sh`

examples/merge_lora/merge.sh

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+#!/bin/bash
+
+python ../../src/export_model.py \
+    --model_name_or_path meta-llama/Llama-2-7b-hf \
+    --adapter_name_or_path ../../saves/LLaMA2-7B/lora/sft \
+    --template default \
+    --finetuning_type lora \
+    --export_dir ../../models/llama2-7b-sft \
+    --export_size 2 \
+    --export_legacy_format False

examples/merge_lora/quantize.sh

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+#!/bin/bash
+
+python ../../src/export_model.py \
+    --model_name_or_path ../../models/llama2-7b-sft \
+    --template default \
+    --export_dir ../../models/llama2-7b-sft-int4 \
+    --export_quantization_bit 4 \
+    --export_quantization_dataset ../../data/c4_demo.json \
+    --export_size 2 \
+    --export_legacy_format False