diff --git a/src/step4_cold_start.py b/src/step4_cold_start.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/step5.1_PPO.py b/src/step5.1_PPO.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/step5.2_GRPO.py b/src/step5.2_GRPO.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/step5_train_reward_model.py b/src/step5_train_reward_model.py
new file mode 100644
index 0000000..e69de29