fix bug - make rollout more consistent

expo/README.md

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+# Expo
+
+
+## Instruction
+
+- 下载数据集：https://deepwisdom.feishu.cn/drive/folder/RVyofv9cvlvtxKdddt2cyn3BnTc?from=from_copylink
+
+
+## Examples
+
+### Run Base DI
+  
+`python run_experiment.py --exp_mode base --task titanic`
+
+### Run DI RandExp
+
+- Single insight
+`python run_experiment.py --exp_mode aug --task titanic --aug_mode single`
+
+- Set insight
+`python run_experiment.py --exp_mode aug --task titanic --aug_mode set`
+
+
+
+### Run DI MCTS
+`python run_experiment.py --exp_mode mcts --task titanic --rollout 5`
+
+`python run_experiment.py --exp_mode mcts --task househouse_prices --rollout 5 --low_is_better`
+
+
+
+