diff --git a/.gitignore b/.gitignore
index 533450a7c..d48035a5b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -165,3 +165,4 @@ applications/ColossalChat/logs
 applications/ColossalChat/tests/logs
 applications/ColossalChat/wandb
 applications/ColossalChat/model
+applications/ColossalChat/eval
diff --git a/applications/ColossalChat/coati/distributed/consumer.py b/applications/ColossalChat/coati/distributed/consumer.py
index b07f8d7a1..816cab50a 100644
--- a/applications/ColossalChat/coati/distributed/consumer.py
+++ b/applications/ColossalChat/coati/distributed/consumer.py
@@ -93,7 +93,6 @@ class BaseConsumer:
                 cc.init_collective_group(self.num_producers + 1, self.num_producers, group_name="sync_model")
 
         self.buffer = []
-
         self.recv_cnt = 0
 
     def state_dict(self) -> Dict[str, torch.Tensor]:
@@ -209,6 +208,8 @@ class SimpleConsumer(BaseConsumer):
             model_config,
             plugin_config,
             minibatch_size,
+            save_interval,
+            save_dir,
         )
         path = model_config.pop("path")
         self.model = AutoModelForCausalLM.from_pretrained(path, **model_config)
diff --git a/applications/ColossalChat/coati/distributed/grpo_consumer.py b/applications/ColossalChat/coati/distributed/grpo_consumer.py
index 72e54b0de..eae4ff54e 100644
--- a/applications/ColossalChat/coati/distributed/grpo_consumer.py
+++ b/applications/ColossalChat/coati/distributed/grpo_consumer.py
@@ -33,12 +33,13 @@ class GRPOConsumer(BaseConsumer):
         plugin_config,
         minibatch_size=1,
         num_generations=8,
-        use_wandb=True,
         generate_config=None,
         grpo_config={},
-        project_name=None,
         save_interval: int = 100,
         save_dir="./model",
+        project_name: str = None,
+        run_name: str = None,
+        wandb_group_name: str = None,
     ):
         print(f"Using GRPO config: {grpo_config}")
         if (
@@ -84,6 +85,9 @@ class GRPOConsumer(BaseConsumer):
         self.effective_sample_count = 0
         self.effective_prompt_count = 0
         self.total_sample_count = 0
+        self.project_name = project_name
+        self.run_name = run_name
+        self.wandb_group_name = wandb_group_name
 
         self.policy_loss_fn = PolicyLoss(
             clip_eps_low=grpo_config.get("clip_eps_low", 0.2),
@@ -134,7 +138,6 @@ class GRPOConsumer(BaseConsumer):
             **reward_model_kwargs,
         )
         self.global_step = 0
-        self.use_wandb = use_wandb
 
         self.lr_scheduler = CosineAnnealingWarmupLR(
             optimizer=self.optimizer,
@@ -145,13 +148,16 @@ class GRPOConsumer(BaseConsumer):
 
     def setup(self):
         super().setup()
-        if self.use_wandb and (
-            (not self.plugin.pp_size > 1 and self.rank == 0)
-            or (self.plugin.pp_size > 1 and self.booster.plugin.stage_manager.is_last_stage() and self.tp_rank == 0)
+        if (not self.plugin.pp_size > 1 and self.rank == 0) or (
+            self.plugin.pp_size > 1 and self.booster.plugin.stage_manager.is_last_stage() and self.tp_rank == 0
         ):
-            # Initialize wandb.
-            name = f"{self.generate_config['backend']}_bs_{self.batch_size*self.dp_size}_temp_{self.generate_config['temperature']:.01f}_top_p_{self.generate_config['top_p']:.02f}"
-            self.wandb_run = wandb.init(project=self.project_name, sync_tensorboard=True, dir="./wandb", name=name)
+            self.wandb_run = wandb.init(
+                project=self.project_name,
+                sync_tensorboard=False,
+                dir="./wandb",
+                name=self.run_name,
+                group=self.wandb_group_name,
+            )
 
         self.policy_model, self.optimizer, _, _, self.lr_scheduler = self.booster.boost(
             self.policy_model, self.optimizer, lr_scheduler=self.lr_scheduler
@@ -265,7 +271,6 @@ class GRPOConsumer(BaseConsumer):
         total_samples = all_reduce_sum(torch.sum(torch.ones_like(loss_mask, device=loss_mask.device)), self.plugin)
         self.effective_sample_count += effective_samples.item()
         self.total_sample_count += total_samples.item()
-
         pbar.set_postfix(
             {
                 "Global Step": self.global_step,
@@ -506,8 +511,8 @@ class GRPOConsumer(BaseConsumer):
                     }
                     if self.policy_loss_fn.beta > 0:
                         metrics["train/kl"] = self.accum_kl.item() / self.accum_count
-
-                    self.wandb_run.log(metrics)
+                    if self.wandb_run is not None:
+                        self.wandb_run.log(metrics)
                 self.accum_loss.zero_()
                 self.accum_reward.zero_()
                 self.accum_ans_acc.zero_()
@@ -521,7 +526,6 @@ class GRPOConsumer(BaseConsumer):
                 # All gather excessive prompts index across DP ranks.
                 excessive_prompts_idx = [idx + self.dp_rank * self.minibatch_size for idx in excessive_prompts_idx]
                 excessive_prompts_idx = all_gather_tensors(excessive_prompts_idx, self.plugin)
-
             return loss_scalar, excessive_prompts_idx
         else:
             return None, excessive_prompts_idx
@@ -530,4 +534,5 @@ class GRPOConsumer(BaseConsumer):
         self.policy_model._force_wait_all_gather()
         model = self.policy_model.unwrap()
         state_dict = model.state_dict()
+        state_dict["consumer_global_step"] = torch.tensor([self.global_step], device=self.device)
         return state_dict
diff --git a/applications/ColossalChat/coati/distributed/inference_backend.py b/applications/ColossalChat/coati/distributed/inference_backend.py
index 8ff4b15bf..ce2a2f28c 100644
--- a/applications/ColossalChat/coati/distributed/inference_backend.py
+++ b/applications/ColossalChat/coati/distributed/inference_backend.py
@@ -205,7 +205,8 @@ class VLLMInferenceBackend(BaseInferenceBackend):
         generate_config = generate_config.copy()
         generate_config.update(self.FORCE_GENERATE_CONFIG)
         generate_config.update({"n": num_generations})
-        self.generate_config = SamplingParams(**generate_config)
+        self.generate_config = generate_config
+        self.sample_params = SamplingParams(**generate_config)
         self.model_config = model_config
         self.tokenizer = tokenizer
         self.num_generations = num_generations
@@ -219,8 +220,9 @@ class VLLMInferenceBackend(BaseInferenceBackend):
         micro_batch_input_ids_no_padding = [
             micro_batch_input_ids[i][first_non_padding_token_idx[i] :] for i in range(micro_batch_size)
         ]
+        sample_params = kwargs.get("sample_params", self.sample_params)
         outputs = self.llm.generate(
-            prompt_token_ids=micro_batch_input_ids_no_padding, sampling_params=self.generate_config, use_tqdm=False
+            prompt_token_ids=micro_batch_input_ids_no_padding, sampling_params=sample_params, use_tqdm=False
         )
         out_tokens = []
         out_len = []
@@ -236,7 +238,7 @@ class VLLMInferenceBackend(BaseInferenceBackend):
                 log_probs.append(p)
 
         # pad them
-        max_len = self.generate_config.max_tokens
+        max_len = self.sample_params.max_tokens
         action_mask = torch.ones(len(out_tokens), max_len, dtype=attention_mask.dtype)
 
         for i, new_token_ids in enumerate(out_tokens):
@@ -266,11 +268,11 @@ class VLLMInferenceBackend(BaseInferenceBackend):
             "response_idx": response_idx,
         }
 
-        data = {k: v.view(micro_batch_size, self.num_generations, v.size(-1)) for k, v in data.items()}
+        data = {k: v.view(micro_batch_size, -1, v.size(-1)) for k, v in data.items()}
 
         if "gt_answer" in kwargs:
             # repeat gt_answer for each prompt.
-            data["gt_answer"] = kwargs["gt_answer"].repeat_interleave(self.num_generations, dim=1)
+            data["gt_answer"] = kwargs["gt_answer"].repeat_interleave(data["input_ids"].size(1), dim=1)
         data = {k: v.to(get_current_device()) for k, v in data.items()}
         return data
 
diff --git a/applications/ColossalChat/coati/distributed/launch.py b/applications/ColossalChat/coati/distributed/launch.py
index a346d1d4f..e6367d2d1 100644
--- a/applications/ColossalChat/coati/distributed/launch.py
+++ b/applications/ColossalChat/coati/distributed/launch.py
@@ -1,4 +1,5 @@
 import copy
+import uuid
 from typing import Any, Dict, Optional
 
 import ray
@@ -34,7 +35,7 @@ def launch_distributed(
     inference_microbatch_size: int,
     train_batch_size: int,
     train_minibatch_size: int,
-    dataset_config: Dict[str, Any],
+    train_dataset_config: Dict[str, Any],
     dataloaders_config: Dict[str, Any],
     inference_model_config: Dict[str, Any],
     generate_config: Dict[str, Any],
@@ -50,8 +51,11 @@ def launch_distributed(
     project_name: Optional[str] = None,
     save_interval: int = 100,
     save_dir: str = "./model",
+    eval_dataset_config: Optional[Dict[str, Any]] = None,
+    eval_interval: int = 100,
+    eval_save_dir: Optional[str] = None,
+    eval_generation_config: Optional[Dict[str, Any]] = None,
 ):
-
     if core_algo not in ALGO_MAP:
         raise NotImplementedError(f"{core_algo} is not supported yet.")
     else:
@@ -60,12 +64,15 @@ def launch_distributed(
     train_dp_size = get_dp_size_fast(num_consumer_procs, plugin_config)
     assert (inference_batch_size * num_producers) % (train_batch_size * train_dp_size) == 0
 
-    dataset_path = dataset_config["path"]
+    dataset_path = train_dataset_config["path"]
     num_samples = get_jsonl_size_fast(dataset_path)
     global_inference_batch_size = inference_batch_size * num_producers
     num_update_per_episode = num_samples // global_inference_batch_size
     num_recv_per_update = inference_batch_size // inference_microbatch_size
 
+    run_name = f"{inference_backend}_bs_{train_batch_size * train_dp_size}_temp_{generate_config['temperature']:.01f}_top_p_{generate_config['top_p']:.02f}"
+    wandb_group_name = str(uuid.uuid4())
+
     procs = []
     for i in range(num_producers):
         producer = SimpleProducer.options(num_gpus=num_proc_per_producer).remote(
@@ -74,7 +81,7 @@ def launch_distributed(
             num_consumer_procs=num_consumer_procs,
             num_episodes=num_episodes,
             batch_size=inference_batch_size,
-            dataset_config=dataset_config,
+            train_dataset_config=train_dataset_config,
             dataloaders_config=dataloaders_config,
             model_config=inference_model_config,
             generate_config=generate_config,
@@ -83,6 +90,14 @@ def launch_distributed(
             backend=inference_backend,
             num_generations=num_generations,
             consumer_plugin_config=plugin_config,
+            eval_dataset_config=eval_dataset_config,
+            eval_interval=eval_interval,
+            evaluation_function_type=grpo_config["reward_fn_type"],
+            eval_save_dir=eval_save_dir,
+            eval_generation_config=eval_generation_config,
+            project_name=project_name,
+            run_name=run_name,
+            wandb_group_name=wandb_group_name,
         )
         procs.append(producer)
     generate_config_consumer = copy.deepcopy(generate_config)
@@ -108,9 +123,11 @@ def launch_distributed(
             generate_config=generate_config_consumer,
             grpo_config=grpo_config,
             num_generations=num_generations,
-            project_name=project_name,
             save_interval=save_interval,
             save_dir=save_dir,
+            project_name=project_name,
+            run_name=run_name,
+            wandb_group_name=wandb_group_name,
         )
         procs.append(consumer)
     ray.get([p.setup.remote() for p in procs])
diff --git a/applications/ColossalChat/coati/distributed/producer.py b/applications/ColossalChat/coati/distributed/producer.py
index ffe3a4428..0d91f43f1 100644
--- a/applications/ColossalChat/coati/distributed/producer.py
+++ b/applications/ColossalChat/coati/distributed/producer.py
@@ -1,9 +1,16 @@
+import copy
+import os
 from typing import Any, Dict, Optional
 
 import ray
 import ray.util.collective as cc
 import torch
+import tqdm
+import wandb
 from coati.dataset.loader import RawConversationDataset
+from coati.distributed.reward.reward_fn import boxed_math_reward_fn, math_reward_fn
+from ray.util.collective import allreduce
+from ray.util.collective.types import Backend, ReduceOp
 from torch.utils.data import DataLoader, DistributedSampler
 from transformers import AutoTokenizer
 
@@ -11,7 +18,12 @@ from colossalai.utils import get_current_device
 
 from .comm import ray_broadcast_tensor_dict
 from .inference_backend import BACKEND_MAP
-from .utils import pre_send
+from .utils import pre_send, safe_append_to_jsonl_file
+
+try:
+    from vllm import SamplingParams
+except ImportError:
+    LLM = None
 
 
 class BaseProducer:
@@ -22,7 +34,7 @@ class BaseProducer:
         num_consumer_procs: int,
         num_episodes: int,
         batch_size: int,
-        dataset_config: Dict[str, Any],
+        train_dataset_config: Dict[str, Any],
         dataloaders_config: Dict[str, Any],
         model_config: Dict[str, Any],
         generate_config: Dict[str, Any],
@@ -30,6 +42,14 @@ class BaseProducer:
         microbatch_size: int = 1,
         backend: str = "transformers",
         consumer_plugin_config: Dict[str, Any] = None,
+        eval_dataset_config=None,
+        eval_interval=-1,  # disable evaluation
+        evaluation_function_type="think_answer_tags",
+        eval_save_dir: str = "./eval",
+        project_name: str = None,
+        run_name: str = None,
+        wandb_group_name: str = None,
+        wandb_log_rollout_interval: int = 20,
     ):
         self.producer_idx = producer_idx
         self.num_producers = num_producers
@@ -39,11 +59,31 @@ class BaseProducer:
         self.microbatch_size = microbatch_size
         assert batch_size % microbatch_size == 0
         self.num_microbatches = batch_size // microbatch_size
+        self.latest_eval_step = -1
 
-        self.dataset_config = dataset_config
+        self.train_dataset_config = train_dataset_config
         self.model_config = model_config
         self.generate_config = generate_config
         self.tokenizer_config = tokenizer_config
+        self.consumer_plugin_config = consumer_plugin_config
+        self.eval_interval = eval_interval
+        self.eval_save_dir = eval_save_dir
+        self.consumer_global_step = 0
+        self.eval_mode = False
+        self.wandb_rollout_data = []
+        self.wandb_log_rollout_interval = wandb_log_rollout_interval
+        self.latest_rollout_log_step = -1
+        if self.producer_idx == 0:
+            self.wandb_run = wandb.init(
+                project=project_name,
+                sync_tensorboard=False,
+                dir="./wandb",
+                name=run_name + "_eval",
+                group=wandb_group_name,
+            )
+
+        if os.path.exists(self.eval_save_dir) and self.eval_interval > 0:
+            raise ValueError(f"Eval save dir {self.eval_save_dir} already exists. Please delete it or change the name.")
 
         # init tokenizer
         if tokenizer_config is None:
@@ -55,13 +95,13 @@ class BaseProducer:
         self.tokenizer.padding_side = "left"
 
         # init dataloader
-        dataset_path = dataset_config.pop("path")
-        self.dataset = RawConversationDataset(self.tokenizer, dataset_path, **dataset_config)
-        self.dataloader = DataLoader(
-            self.dataset,
+        train_dataset_path = train_dataset_config.pop("path")
+        self.train_dataset = RawConversationDataset(self.tokenizer, train_dataset_path, **train_dataset_config)
+        self.train_dataloader = DataLoader(
+            self.train_dataset,
             batch_size=microbatch_size,
             sampler=DistributedSampler(
-                self.dataset,
+                self.train_dataset,
                 num_replicas=num_producers,
                 rank=producer_idx,
                 shuffle=True,
@@ -71,6 +111,36 @@ class BaseProducer:
             num_workers=4,
             drop_last=True,
         )
+
+        self.eval_dataset_config = eval_dataset_config
+        if self.eval_dataset_config is not None:
+            self.eval_dataloaders = {}
+            for eval_task_name in self.eval_dataset_config:
+                eval_dataset_path = eval_dataset_config[eval_task_name].pop("path")
+                eval_dataset = RawConversationDataset(
+                    self.tokenizer, eval_dataset_path, **eval_dataset_config[eval_task_name]
+                )
+                print(f"[P{self.producer_idx}] eval dataset {eval_task_name} size: {len(eval_dataset)}")
+                self.eval_dataloaders[eval_task_name] = DataLoader(
+                    eval_dataset,
+                    batch_size=microbatch_size,
+                    sampler=DistributedSampler(
+                        eval_dataset,
+                        num_replicas=num_producers,
+                        rank=producer_idx,
+                        shuffle=False,
+                        drop_last=False,
+                        seed=42,
+                    ),
+                )
+            if evaluation_function_type == "think_answer_tags":
+                self.evaluation_function = math_reward_fn
+            elif evaluation_function_type == "boxed":
+                self.evaluation_function = boxed_math_reward_fn
+            else:
+                raise ValueError(f"Unknown evaluation function type {evaluation_function_type}")
+        else:
+            raise ValueError("eval_dataset_config is not defined")
         self.device = get_current_device()
 
         # init backend
@@ -82,6 +152,12 @@ class BaseProducer:
         self.consumer_pp_size = consumer_plugin_config.get("pp_size", 1)  # consumer pp size
 
     def setup(self) -> None:
+        cc.init_collective_group(
+            world_size=self.num_producers,
+            rank=self.producer_idx,
+            backend=Backend.NCCL,
+            group_name="producer_group",
+        )
         cc.init_collective_group(1 + self.num_consumer_procs, 0, group_name=f"sync_data_{self.producer_idx}")
         if self.consumer_pp_size > 1:
             for i in range(self.consumer_pp_size):
@@ -96,29 +172,74 @@ class BaseProducer:
         raise NotImplementedError
 
     def loop(self) -> None:
-        num_update_per_episode = len(self.dataloader) // self.num_microbatches
+        num_update_per_episode = len(self.train_dataloader) // self.num_microbatches
         num_valid_microbatches = num_update_per_episode * self.num_microbatches
 
         print(
-            f"[P{self.producer_idx}] num_valid_microbatches {num_valid_microbatches}, nmb: {self.num_microbatches}, dl: {len(self.dataloader)}"
+            f"[P{self.producer_idx}] num_valid_microbatches {num_valid_microbatches}, nmb: {self.num_microbatches}, dl: {len(self.train_dataloader)}"
         )
         for episode in range(self.num_episodes):
-            self.dataloader.sampler.set_epoch(episode)
-            for i, batch in enumerate(self.dataloader):
+            self.train_dataloader.sampler.set_epoch(episode)
+            for i, batch in enumerate(self.train_dataloader):
                 if i >= num_valid_microbatches:
                     break
+                if self.eval_interval > 0 and self.eval_dataset_config is not None:
+                    if (
+                        self.consumer_global_step - self.latest_eval_step >= self.eval_interval
+                        and self.consumer_global_step > self.latest_eval_step
+                    ) or self.latest_eval_step == -1:
+                        to_log_msg = {}
+                        self.eval_mode = True
+                        for eval_task_name in self.eval_dataloaders:
+                            if self.producer_idx == 0:
+                                print(
+                                    f"[P{self.producer_idx}] Evaluate model at training step {self.consumer_global_step} on task {eval_task_name}"
+                                )
+                            eval_results = []
+                            eval_statistics_tensor = torch.zeros((2,), dtype=torch.float32).to(self.device)
+                            for eval_batch in tqdm.tqdm(
+                                self.eval_dataloaders[eval_task_name], disable=self.producer_idx != 0
+                            ):
+                                eval_outputs = self.rollout(**eval_batch, sample_params=self.eval_sample_params)
+                                eval_results = eval_results + [
+                                    self.evaluation_function(
+                                        eval_outputs["input_ids"][m][n],
+                                        eval_outputs["gt_answer"][m][n],
+                                        eval_outputs["response_idx"][m][n],
+                                        tokenizer=self.tokenizer,
+                                        eval_mode=True,
+                                    )
+                                    for m in range(eval_outputs["input_ids"].size(0))
+                                    for n in range(eval_outputs["input_ids"].size(1))
+                                ]
+                            eval_statistics_tensor[0] += len([res for res in eval_results if res["ans_valid"] == 1])
+                            eval_statistics_tensor[1] += len(eval_results)
+                            allreduce(eval_statistics_tensor, op=ReduceOp.SUM, group_name="producer_group")
+                            to_log_msg[f"eval/{eval_task_name}"] = (
+                                eval_statistics_tensor[0].item() / eval_statistics_tensor[1].item()
+                            )
+                            if self.producer_idx == 0:
+                                print(
+                                    f"[P{self.producer_idx}]: Accuracy on {eval_task_name}: {to_log_msg[f'eval/{eval_task_name}']}"
+                                )
+                            # save eval results
+                            safe_append_to_jsonl_file(
+                                os.path.join(
+                                    self.eval_save_dir,
+                                    f"{eval_task_name}_training_step_{self.consumer_global_step}.jsonl",
+                                ),
+                                eval_results,
+                            )
+
+                        if self.producer_idx == 0:
+                            self.wandb_run.log(to_log_msg, step=self.consumer_global_step)
+                        self.eval_mode = False
+                        self.latest_eval_step = self.consumer_global_step
                 outputs = self.rollout(**batch)
 
                 print(f"[P{self.producer_idx}] Send data {[(k, v.shape) for k, v in outputs.items()]}")
                 outputs["temperature"] = torch.tensor(
-                    [
-                        (
-                            self.model.generate_config["temperature"]
-                            if isinstance(self.model.generate_config.temperature, dict)
-                            else self.model.generate_config.temperature
-                        )
-                    ]
-                    * outputs["input_ids"].size(0)
+                    [self.model.generate_config["temperature"]] * outputs["input_ids"].size(0)
                 ).to(outputs["input_ids"].device)
                 outputs = pre_send(outputs)
                 ray_broadcast_tensor_dict(
@@ -142,6 +263,8 @@ class BaseProducer:
                             state_dict = ray_broadcast_tensor_dict(
                                 None, self.num_producers, device=self.device, group_name=f"sync_model_{pp_idx}"
                             )
+                            if "consumer_global_step" in state_dict:
+                                self.consumer_global_step = state_dict.pop("consumer_global_step").item()
                             self.load_state_dict(state_dict)
                     else:
                         print(
@@ -150,6 +273,8 @@ class BaseProducer:
                         state_dict = ray_broadcast_tensor_dict(
                             None, self.num_producers, device=self.device, group_name="sync_model"
                         )
+                        if "consumer_global_step" in state_dict:
+                            self.consumer_global_step = state_dict.pop("consumer_global_step").item()
                         self.load_state_dict(state_dict)
                     del state_dict
                     torch.cuda.empty_cache()
@@ -159,13 +284,12 @@ class BaseProducer:
                         self.model.llm.wake_up()
                 # linear annealing for 1 episode, temperature from initial to 0.9
                 if episode <= 0:
-                    ratio = 1 - (len(self.dataloader) - i) / len(self.dataloader)
-                    if isinstance(self.model.generate_config.temperature, dict):
-                        self.model.generate_config["temperature"] = (1 - ratio) * self.generate_config[
-                            "temperature"
-                        ] + ratio * 0.9
-                    else:
-                        self.model.generate_config.temperature = (1 - ratio) * self.generate_config[
+                    ratio = 1 - (len(self.train_dataloader) - i) / len(self.train_dataloader)
+                    self.model.generate_config["temperature"] = (1 - ratio) * self.generate_config[
+                        "temperature"
+                    ] + ratio * 0.9
+                    if isinstance(self.model, BACKEND_MAP["vllm"]):
+                        self.model.sample_params.temperature = (1 - ratio) * self.generate_config[
                             "temperature"
                         ] + ratio * 0.9
 
@@ -179,7 +303,7 @@ class SimpleProducer(BaseProducer):
         num_consumer_procs,
         num_episodes,
         batch_size,
-        dataset_config,
+        train_dataset_config,
         dataloaders_config,
         model_config,
         generate_config,
@@ -188,6 +312,14 @@ class SimpleProducer(BaseProducer):
         backend="transformers",
         num_generations: int = 8,
         consumer_plugin_config=None,
+        eval_dataset_config=None,
+        eval_interval=-1,  # disable evaluation
+        evaluation_function_type="think_answer_tags",
+        eval_save_dir: str = "./eval",
+        eval_generation_config={},
+        project_name: str = None,
+        run_name: str = None,
+        wandb_group_name: str = None,
     ):
         super().__init__(
             producer_idx,
@@ -195,7 +327,7 @@ class SimpleProducer(BaseProducer):
             num_consumer_procs,
             num_episodes,
             batch_size,
-            dataset_config,
+            train_dataset_config,
             dataloaders_config,
             model_config,
             generate_config,
@@ -203,15 +335,43 @@ class SimpleProducer(BaseProducer):
             microbatch_size,
             backend,
             consumer_plugin_config,
+            eval_dataset_config=eval_dataset_config,
+            eval_interval=eval_interval,
+            evaluation_function_type=evaluation_function_type,
+            eval_save_dir=eval_save_dir,
+            project_name=project_name,
+            run_name=run_name,
+            wandb_group_name=wandb_group_name,
         )
         self.model = self.backend_cls(model_config, generate_config, self.tokenizer, num_generations)
+        self.eval_generation_config = copy.deepcopy(self.model.generate_config)
+        self.eval_generation_config["n"] = 1  # use 1 generation for evaluation
+        self.eval_generation_config.update(eval_generation_config)
+        self.eval_sample_params = SamplingParams(**self.eval_generation_config)
 
     @torch.no_grad()
     def rollout(self, input_ids, attention_mask, **kwargs):
         rollouts = self.model.generate(input_ids, attention_mask, **kwargs)
-        if self.producer_idx == 1:
-            print("Rollout example:\n", self.tokenizer.decode(rollouts["input_ids"][0][0], skip_special_tokens=True))
-
+        if self.producer_idx == 0 and not self.eval_mode:
+            wandb_rollout_data = self.wandb_rollout_data + [
+                [
+                    str(self.consumer_global_step),
+                    str(self.tokenizer.decode(rollouts["input_ids"][0][0], skip_special_tokens=True)),
+                ]
+            ]
+            if (
+                self.consumer_global_step - self.latest_rollout_log_step >= self.wandb_log_rollout_interval
+                or self.latest_rollout_log_step == -1
+            ):
+                self.wandb_rollout_data = wandb_rollout_data
+                self.latest_rollout_log_step = self.consumer_global_step
+            self.wandb_run.log(
+                {
+                    "rollout/rollout_examples": wandb.Table(
+                        columns=["train_step", "rollout_examples"], data=wandb_rollout_data
+                    )
+                }
+            )
         return rollouts
 
     def load_state_dict(self, state_dict):
diff --git a/applications/ColossalChat/coati/distributed/reward/reward_fn.py b/applications/ColossalChat/coati/distributed/reward/reward_fn.py
index b68c1a92f..14d340dc4 100644
--- a/applications/ColossalChat/coati/distributed/reward/reward_fn.py
+++ b/applications/ColossalChat/coati/distributed/reward/reward_fn.py
@@ -5,6 +5,7 @@ from .reward_utils import extract_boxed_solution, extract_solution, validate_res
 
 def math_reward_fn(input_ids, gt_answer, response_idx, **kwargs):
     tokenizer = kwargs["tokenizer"]
+    eval_mode = kwargs.get("eval_mode", False)
     soft_over_length_punishment = kwargs.get("soft_over_length_punishment", False)
     acc_score = 10.0
     reward = torch.tensor(0.0)
@@ -44,36 +45,23 @@ def math_reward_fn(input_ids, gt_answer, response_idx, **kwargs):
 
     reward = reward + length_reward
 
-    return torch.tensor([reward, format_acc, ans_acc]).to(input_ids.device)
-
-
-def gsm8k_reward_fn(input_ids, **kwargs):
-    gt_answer = kwargs["gt_answer"]
-    tokenizer = kwargs["tokenizer"]
-    s, e = kwargs["response_start"], kwargs["response_end"]
-    reward = torch.tensor(0.0).to(input_ids.device)
-    if gt_answer is None:
-        return reward
-    decoded_final_answer = tokenizer.decode(input_ids[s : e + 1], skip_special_tokens=True)
-    final_answer, processed_str = extract_solution(decoded_final_answer)
-    is_valid = True
-    try:
-        int(final_answer.strip())
-    except Exception:
-        is_valid = False
-
-    format_valid = validate_response_structure(processed_str, kwargs["tags"])
-    if not is_valid or not format_valid:
-        return reward
+    if not eval_mode:
+        return torch.tensor([reward, format_acc, ans_acc]).to(input_ids.device)
     else:
-        reward += 1.0
-        if gt_answer.strip().replace(" ", "").lower() == final_answer.strip().replace(" ", "").lower():
-            reward = reward + 9.0
-        return reward
+        prompt = tokenizer.decode(input_ids[:s], skip_special_tokens=True)
+        return {
+            "prompt": prompt,
+            "prediction": decoded_final_answer,
+            "gold": gt_answer,
+            "parsed": final_answer,
+            "format_valid": format_acc.item(),
+            "ans_valid": ans_acc.item(),
+        }
 
 
 def boxed_math_reward_fn(input_ids, gt_answer, response_idx, **kwargs):
     tokenizer = kwargs["tokenizer"]
+    eval_mode = kwargs.get("eval_mode", False)
     soft_over_length_punishment = kwargs.get("soft_over_length_punishment", False)
     format_score = 0.0
     acc_score = 10.0
@@ -91,7 +79,7 @@ def boxed_math_reward_fn(input_ids, gt_answer, response_idx, **kwargs):
             length_reward = ((max_length - cache_length) - res_length) / cache_length * acc_score
 
     if gt_answer is None:
-        return reward
+        return torch.tensor([reward, format_acc, ans_acc]).to(input_ids.device)
 
     decoded_final_answer = tokenizer.decode(input_ids[s : e + 1], skip_special_tokens=True)
     gt_answer = tokenizer.decode(gt_answer.squeeze(0), skip_special_tokens=True)
@@ -108,5 +96,15 @@ def boxed_math_reward_fn(input_ids, gt_answer, response_idx, **kwargs):
         reward += acc_score
 
     reward = reward + length_reward
-
-    return torch.tensor([reward, format_acc, ans_acc]).to(input_ids.device)
+    if not eval_mode:
+        return torch.tensor([reward, format_acc, ans_acc]).to(input_ids.device)
+    else:
+        prompt = tokenizer.decode(input_ids[:s], skip_special_tokens=True)
+        return {
+            "prompt": prompt,
+            "prediction": decoded_final_answer,
+            "gold": gt_answer,
+            "parsed": final_answer,
+            "format_valid": format_acc.item(),
+            "ans_valid": ans_acc.item(),
+        }
diff --git a/applications/ColossalChat/coati/distributed/utils.py b/applications/ColossalChat/coati/distributed/utils.py
index 5f7879669..a40ebbcfb 100644
--- a/applications/ColossalChat/coati/distributed/utils.py
+++ b/applications/ColossalChat/coati/distributed/utils.py
@@ -1,6 +1,9 @@
+import json
+import os
 from typing import Any, Dict, List
 
 import torch
+from filelock import FileLock
 
 from colossalai.shardformer.layer.loss import dist_log_prob
 
@@ -130,3 +133,13 @@ def masked_sum(tensor: torch.Tensor, mask: torch.Tensor, dim: int = 1) -> torch.
     """
     tensor = tensor * mask
     return tensor.sum(dim=dim)
+
+
+def safe_append_to_jsonl_file(file_path, data):
+    with FileLock(file_path + ".lock"):
+        # Ensure file exists
+        os.makedirs(os.path.dirname(file_path), exist_ok=True)
+        with open(file_path, "a", encoding="utf8") as f:
+            for entry in data:
+                json_line = json.dumps(entry, ensure_ascii=False)
+                f.write(json_line + "\n")
diff --git a/applications/ColossalChat/rl_example.py b/applications/ColossalChat/rl_example.py
index f5609c890..8d1f25e74 100644
--- a/applications/ColossalChat/rl_example.py
+++ b/applications/ColossalChat/rl_example.py
@@ -1,4 +1,5 @@
 import argparse
+import json
 import os
 
 import ray
@@ -9,7 +10,16 @@ if __name__ == "__main__":
     parser = argparse.ArgumentParser()
     parser.add_argument("-m", "--model", type=str, default="Qwen/Qwen2.5-7B")
     parser.add_argument("-d", "--dataset", type=str, default="data.jsonl")
-    parser.add_argument("-p", "--project", type=str, default="GRPO-V3", help="Project name.")
+    parser.add_argument(
+        "-ed",
+        "--eval-dataset",
+        type=str,
+        default='{"eval task name":"data_eval.jsonl"}',
+        help="Evaluation dataset for each task, please use json format to specify the dataset for each task. \
+        For example: {'task1':'data_eval_task1.jsonl', 'task2':'data_eval_task2.jsonl'}, the jsonl file should be in the same format as the training dataset. \
+        The key is the task name, and the value is the path to the jsonl file",
+    )
+    parser.add_argument("-p", "--project", type=str, default="GRPO", help="Project name.")
     parser.add_argument("-e", "--num-episodes", type=int, default=1, help="Number of episodes to train.")
 
     # Distributed training parameters
@@ -94,11 +104,20 @@ if __name__ == "__main__":
         choices=["think_answer_tags", "boxed"],
         help="Reward type for GRPO.",
     )
+    parser.add_argument(
+        "-ei",
+        "--eval-interval",
+        type=int,
+        default=100,
+        help="Interval for evaluation. Evaluate every ei training steps.",
+    )
 
     # Logging/Checkpointing parameters
     parser.add_argument("-si", "--save-interval", type=int, default=100, help="Interval for saving checkpoints.")
     parser.add_argument("-sd", "--save-dir", type=str, default="./model", help="Directory for saving checkpoints.")
-
+    parser.add_argument(
+        "-esd", "--eval-save-dir", type=str, default="./eval", help="Directory for saving evaluation results."
+    )
     args = parser.parse_args()
 
     if args.train_minibatch_size is None:
@@ -148,6 +167,7 @@ if __name__ == "__main__":
                 stop_strings=["</answer>"] if args.reward_type == "think_answer_tags" else None,
             )
         )
+        eval_generation_config = {"temperature": 0.6}  # used to update generation config for evaluation
     elif args.backend == "vllm":
         inference_model_config.update(
             dict(
@@ -166,6 +186,7 @@ if __name__ == "__main__":
                 stop=["</answer>"] if args.reward_type == "think_answer_tags" else None,
             )
         )
+        eval_generation_config = {"temperature": 0.6}  # used to update generation config for evaluation
     else:
         raise ValueError(f"Unsupported backend: {args.backend}")
 
@@ -208,7 +229,7 @@ if __name__ == "__main__":
         inference_microbatch_size=args.inference_microbatch_size,
         train_batch_size=args.train_batch_size,
         train_minibatch_size=args.train_minibatch_size,
-        dataset_config={
+        train_dataset_config={
             "path": args.dataset,
             "max_length": args.max_prompt_tokens,
             "system_prompt": args.system_prompt,
@@ -238,4 +259,11 @@ if __name__ == "__main__":
         project_name=args.project,
         save_interval=args.save_interval,
         save_dir=os.path.join(args.save_dir, args.project.replace(" ", "_")),
+        eval_dataset_config={
+            k: {"path": v, "max_length": args.max_prompt_tokens, "system_prompt": args.system_prompt}
+            for k, v in json.loads(args.eval_dataset).items()
+        },
+        eval_interval=args.eval_interval,
+        eval_save_dir=os.path.join(args.eval_save_dir, args.project.replace(" ", "_")),
+        eval_generation_config=eval_generation_config,
     )