diff --git a/examples/configs/v0.2-qwen2-math/1.5B-distill/ppo-1.5B-distill-gpus-128.yaml b/examples/configs/v0.2-qwen2-math/1.5B-distill/ppo-1.5B-distill-gpus-128.yaml
index 254716f..dd422b4 100644
--- a/examples/configs/v0.2-qwen2-math/1.5B-distill/ppo-1.5B-distill-gpus-128.yaml
+++ b/examples/configs/v0.2-qwen2-math/1.5B-distill/ppo-1.5B-distill-gpus-128.yaml
@@ -29,12 +29,6 @@ actor:
     mem_fraction_static: 0.8
     triton_attention_num_kv_splits: 16
     enable_metrics: True
-critic:
-  type:
-    _class: qwen2
-    is_critic: true
-  path: '/storage/models/DeepSeek-R1-Distill-Qwen-1.5B'
-  init_critic_from_actor: true
 ref:
   type:
     _class: qwen2
@@ -42,15 +36,6 @@ ref:
 actor_train:
   mb_spec:
     max_tokens_per_mb: 30720
-critic_train:
-  mb_spec:
-    max_tokens_per_mb: 30720
-actor_gen:
-  mb_spec:
-    max_tokens_per_mb: 30720
-critic_inf:
-  mb_spec:
-    max_tokens_per_mb: 30720
 actor_inf:
   mb_spec:
     max_tokens_per_mb: 30720
@@ -68,8 +53,6 @@ ppo:
     top_p: 1.0
     top_k: 1000000
     temperature: 1.0
-    force_no_logits_mask: True
-    use_cuda_graph: True
   ppo_n_minibatches: 4
   kl_ctl: 0.0
   discount: 1.0
@@ -78,11 +61,12 @@ ppo:
   reward_output_scaling: 5
   reward_output_bias: 0.0
   adv_norm: true
-  value_norm: true
 group_size: 16
 group_adv_norm: false
-external_configs:
-  cluster_config:
-    fileroot: "/storage/ray/experiments"
-  envs:
-    REAL_GPU_MEMORY_KILL_THRESHOLD: "1"
+
+# Cluster configuration
+ray_temp_path: /tmp/ray
+cluster:
+  fileroot: /tmp/ray/experiments
+  n_nodes: 32
+  n_gpus_per_node: 8
\ No newline at end of file
diff --git a/examples/configs/v0.2-qwen2-math/1.5B-distill/ppo-1.5B-distill-gpus-32.yaml b/examples/configs/v0.2-qwen2-math/1.5B-distill/ppo-1.5B-distill-gpus-32.yaml
index cc0b8dd..ec101b4 100644
--- a/examples/configs/v0.2-qwen2-math/1.5B-distill/ppo-1.5B-distill-gpus-32.yaml
+++ b/examples/configs/v0.2-qwen2-math/1.5B-distill/ppo-1.5B-distill-gpus-32.yaml
@@ -29,12 +29,6 @@ actor:
     mem_fraction_static: 0.8
     triton_attention_num_kv_splits: 16
     enable_metrics: True
-critic:
-  type:
-    _class: qwen2
-    is_critic: true
-  path: '/storage/models/DeepSeek-R1-Distill-Qwen-1.5B'
-  init_critic_from_actor: true
 ref:
   type:
     _class: qwen2
@@ -42,15 +36,6 @@ ref:
 actor_train:
   mb_spec:
     max_tokens_per_mb: 30720
-critic_train:
-  mb_spec:
-    max_tokens_per_mb: 30720
-actor_gen:
-  mb_spec:
-    max_tokens_per_mb: 30720
-critic_inf:
-  mb_spec:
-    max_tokens_per_mb: 30720
 actor_inf:
   mb_spec:
     max_tokens_per_mb: 30720
@@ -68,8 +53,6 @@ ppo:
     top_p: 1.0
     top_k: 1000000
     temperature: 1.0
-    force_no_logits_mask: True
-    use_cuda_graph: True
   ppo_n_minibatches: 4
   kl_ctl: 0.0
   discount: 1.0
@@ -78,11 +61,12 @@ ppo:
   reward_output_scaling: 5
   reward_output_bias: 0.0
   adv_norm: true
-  value_norm: true
 group_size: 16
 group_adv_norm: false
-external_configs:
-  cluster_config:
-    fileroot: "/storage/ray/experiments"
-  envs:
-    REAL_GPU_MEMORY_KILL_THRESHOLD: "1"
+
+# Cluster configuration
+ray_temp_path: /tmp/ray
+cluster:
+  fileroot: /tmp/ray/experiments
+  n_nodes: 32
+  n_gpus_per_node: 8
\ No newline at end of file
diff --git a/examples/configs/v0.2-qwen2-math/1.5B-distill/ppo-1.5B-distill-gpus-8.yaml b/examples/configs/v0.2-qwen2-math/1.5B-distill/ppo-1.5B-distill-gpus-8.yaml
index 4ffa1ce..680c443 100644
--- a/examples/configs/v0.2-qwen2-math/1.5B-distill/ppo-1.5B-distill-gpus-8.yaml
+++ b/examples/configs/v0.2-qwen2-math/1.5B-distill/ppo-1.5B-distill-gpus-8.yaml
@@ -29,12 +29,6 @@ actor:
     mem_fraction_static: 0.8
     triton_attention_num_kv_splits: 16
     enable_metrics: True
-critic:
-  type:
-    _class: qwen2
-    is_critic: true
-  path: '/storage/models/DeepSeek-R1-Distill-Qwen-1.5B'
-  init_critic_from_actor: true
 ref:
   type:
     _class: qwen2
@@ -42,15 +36,6 @@ ref:
 actor_train:
   mb_spec:
     max_tokens_per_mb: 30720
-critic_train:
-  mb_spec:
-    max_tokens_per_mb: 30720
-actor_gen:
-  mb_spec:
-    max_tokens_per_mb: 30720
-critic_inf:
-  mb_spec:
-    max_tokens_per_mb: 30720
 actor_inf:
   mb_spec:
     max_tokens_per_mb: 30720
@@ -68,8 +53,6 @@ ppo:
     top_p: 1.0
     top_k: 1000000
     temperature: 1.0
-    force_no_logits_mask: True
-    use_cuda_graph: True
   ppo_n_minibatches: 4
   kl_ctl: 0.0
   discount: 1.0
@@ -78,11 +61,12 @@ ppo:
   reward_output_scaling: 5
   reward_output_bias: 0.0
   adv_norm: true
-  value_norm: true
 group_size: 16
 group_adv_norm: false
-external_configs:
-  cluster_config:
-    fileroot: "/storage/ray/experiments"
-  envs:
-    REAL_GPU_MEMORY_KILL_THRESHOLD: "1"
+
+# Cluster configuration
+ray_temp_path: /tmp/ray
+cluster:
+  fileroot: /tmp/ray/experiments
+  n_nodes: 32
+  n_gpus_per_node: 8
diff --git a/examples/configs/v0.2-qwen2-math/32B-distill/ppo-32B-distill-gpus-128.yaml b/examples/configs/v0.2-qwen2-math/32B-distill/ppo-32B-distill-gpus-128.yaml
index 0da7d8c..f6cf41b 100644
--- a/examples/configs/v0.2-qwen2-math/32B-distill/ppo-32B-distill-gpus-128.yaml
+++ b/examples/configs/v0.2-qwen2-math/32B-distill/ppo-32B-distill-gpus-128.yaml
@@ -27,17 +27,8 @@ actor:
     hysteresis: 2
   sglang:
     mem_fraction_static: 0.8
-    disable_radix_cache: false
     triton_attention_num_kv_splits: 16
-    max_running_requests: 128
-    context_length: 29696
     enable_metrics: True
-critic:
-  type:
-    _class: qwen2
-    is_critic: true
-  path: '/storage/models/DeepSeek-R1-Distill-Qwen-32B'
-  init_critic_from_actor: true
 ref:
   type:
     _class: qwen2
@@ -45,15 +36,6 @@ ref:
 actor_train:
   mb_spec:
     max_tokens_per_mb: 30720
-critic_train:
-  mb_spec:
-    max_tokens_per_mb: 30720
-actor_gen:
-  mb_spec:
-    max_tokens_per_mb: 30720
-critic_inf:
-  mb_spec:
-    max_tokens_per_mb: 30720
 actor_inf:
   mb_spec:
     max_tokens_per_mb: 30720
@@ -71,8 +53,6 @@ ppo:
     top_p: 1.0
     top_k: 1000000
     temperature: 1.0
-    force_no_logits_mask: True
-    use_cuda_graph: True
   ppo_n_minibatches: 4
   kl_ctl: 0.0
   discount: 1.0
@@ -81,11 +61,12 @@ ppo:
   reward_output_scaling: 5
   reward_output_bias: 0.0
   adv_norm: true
-  value_norm: true
 group_size: 32
 group_adv_norm: false
-external_configs:
-  cluster_config:
-    fileroot: "/storage/ray/experiments"
-  envs:
-    REAL_GPU_MEMORY_KILL_THRESHOLD: "1"
+
+# Cluster configuration
+ray_temp_path: /tmp/ray
+cluster:
+  fileroot: /tmp/ray/experiments
+  n_nodes: 32
+  n_gpus_per_node: 8
diff --git a/examples/configs/v0.2-qwen2-math/32B-distill/sft-32B-distill-gpus-128.yaml b/examples/configs/v0.2-qwen2-math/32B-distill/sft-32B-distill-gpus-128.yaml
index a8d7ef5..b4c19cf 100644
--- a/examples/configs/v0.2-qwen2-math/32B-distill/sft-32B-distill-gpus-128.yaml
+++ b/examples/configs/v0.2-qwen2-math/32B-distill/sft-32B-distill-gpus-128.yaml
@@ -37,8 +37,10 @@ model:
 allocation:
   mb_spec:
     max_tokens_per_mb: 32768
-external_configs:
-  cluster_config:
-    fileroot: "/storage/ray/experiments"
-  envs:
-    REAL_GPU_MEMORY_KILL_THRESHOLD: "1"
+
+# Cluster configuration
+ray_temp_path: /tmp/ray
+cluster:
+  fileroot: /tmp/ray/experiments
+  n_nodes: 32
+  n_gpus_per_node: 8
diff --git a/examples/configs/v0.2-qwen2-math/7B-distill/ppo-7B-distill-gpus-128.yaml b/examples/configs/v0.2-qwen2-math/7B-distill/ppo-7B-distill-gpus-128.yaml
index e521f80..d930d35 100644
--- a/examples/configs/v0.2-qwen2-math/7B-distill/ppo-7B-distill-gpus-128.yaml
+++ b/examples/configs/v0.2-qwen2-math/7B-distill/ppo-7B-distill-gpus-128.yaml
@@ -29,12 +29,6 @@ actor:
     mem_fraction_static: 0.8
     triton_attention_num_kv_splits: 16
     enable_metrics: True
-critic:
-  type:
-    _class: qwen2
-    is_critic: true
-  path: '/storage/models/DeepSeek-R1-Distill-Qwen-7B'
-  init_critic_from_actor: true
 ref:
   type:
     _class: qwen2
@@ -42,15 +36,6 @@ ref:
 actor_train:
   mb_spec:
     max_tokens_per_mb: 30720
-critic_train:
-  mb_spec:
-    max_tokens_per_mb: 30720
-actor_gen:
-  mb_spec:
-    max_tokens_per_mb: 30720
-critic_inf:
-  mb_spec:
-    max_tokens_per_mb: 30720
 actor_inf:
   mb_spec:
     max_tokens_per_mb: 30720
@@ -68,8 +53,6 @@ ppo:
     top_p: 1.0
     top_k: 1000000
     temperature: 1.0
-    force_no_logits_mask: True
-    use_cuda_graph: True
   ppo_n_minibatches: 4
   kl_ctl: 0.0
   discount: 1.0
@@ -78,11 +61,12 @@ ppo:
   reward_output_scaling: 5
   reward_output_bias: 0.0
   adv_norm: true
-  value_norm: true
 group_size: 16
 group_adv_norm: false
-external_configs:
-  cluster_config:
-    fileroot: "/storage/ray/experiments"
-  envs:
-    REAL_GPU_MEMORY_KILL_THRESHOLD: "1"
+
+# Cluster configuration
+ray_temp_path: /tmp/ray
+cluster:
+  fileroot: /tmp/ray/experiments
+  n_nodes: 32
+  n_gpus_per_node: 8
diff --git a/examples/configs/v0.2-qwen2-math/7B-distill/ppo-7B-distill-gpus-32.yaml b/examples/configs/v0.2-qwen2-math/7B-distill/ppo-7B-distill-gpus-32.yaml
index 9218181..74a13cc 100644
--- a/examples/configs/v0.2-qwen2-math/7B-distill/ppo-7B-distill-gpus-32.yaml
+++ b/examples/configs/v0.2-qwen2-math/7B-distill/ppo-7B-distill-gpus-32.yaml
@@ -29,12 +29,6 @@ actor:
     mem_fraction_static: 0.8
     triton_attention_num_kv_splits: 16
     enable_metrics: True
-critic:
-  type:
-    _class: qwen2
-    is_critic: true
-  path: '/storage/models/DeepSeek-R1-Distill-Qwen-7B'
-  init_critic_from_actor: true
 ref:
   type:
     _class: qwen2
@@ -42,15 +36,6 @@ ref:
 actor_train:
   mb_spec:
     max_tokens_per_mb: 30720
-critic_train:
-  mb_spec:
-    max_tokens_per_mb: 30720
-actor_gen:
-  mb_spec:
-    max_tokens_per_mb: 30720
-critic_inf:
-  mb_spec:
-    max_tokens_per_mb: 30720
 actor_inf:
   mb_spec:
     max_tokens_per_mb: 30720
@@ -68,8 +53,6 @@ ppo:
     top_p: 1.0
     top_k: 1000000
     temperature: 1.0
-    force_no_logits_mask: True
-    use_cuda_graph: True
   ppo_n_minibatches: 4
   kl_ctl: 0.0
   discount: 1.0
@@ -78,11 +61,12 @@ ppo:
   reward_output_scaling: 5
   reward_output_bias: 0.0
   adv_norm: true
-  value_norm: true
 group_size: 16
 group_adv_norm: false
-external_configs:
-  cluster_config:
-    fileroot: "/storage/ray/experiments"
-  envs:
-    REAL_GPU_MEMORY_KILL_THRESHOLD: "1"
+
+# Cluster configuration
+ray_temp_path: /tmp/ray
+cluster:
+  fileroot: /tmp/ray/experiments
+  n_nodes: 32
+  n_gpus_per_node: 8
diff --git a/examples/configs/v0.2-qwen2-math/7B-zero/ppo-7B-zero-gpus-128.yaml b/examples/configs/v0.2-qwen2-math/7B-zero/ppo-7B-zero-gpus-128.yaml
index a93e1c6..73c6824 100644
--- a/examples/configs/v0.2-qwen2-math/7B-zero/ppo-7B-zero-gpus-128.yaml
+++ b/examples/configs/v0.2-qwen2-math/7B-zero/ppo-7B-zero-gpus-128.yaml
@@ -27,19 +27,8 @@ actor:
     hysteresis: 2
   sglang:
     mem_fraction_static: 0.8
-    disable_radix_cache: false
     triton_attention_num_kv_splits: 16
-    max_running_requests: 128
-    context_length: 18432
     enable_metrics: True
-critic:
-  type:
-    _class: qwen2
-    is_critic: true
-  path: '/storage/models/Qwen2.5-7B'
-  init_critic_from_actor: true
-  optimizer:
-    lr: 5e-6
 ref:
   type:
     _class: qwen2
@@ -47,15 +36,6 @@ ref:
 actor_train:
   mb_spec:
     max_tokens_per_mb: 19456
-critic_train:
-  mb_spec:
-    max_tokens_per_mb: 19456
-actor_gen:
-  mb_spec:
-    max_tokens_per_mb: 19456
-critic_inf:
-  mb_spec:
-    max_tokens_per_mb: 19456
 actor_inf:
   mb_spec:
     max_tokens_per_mb: 19456
@@ -73,8 +53,6 @@ ppo:
     top_p: 1.0
     top_k: 1000000
     temperature: 1.0
-    force_no_logits_mask: true
-    use_cuda_graph: true
   ppo_n_minibatches: 4
   kl_ctl: 0.0
   discount: 1.0
@@ -83,11 +61,12 @@ ppo:
   reward_output_scaling: 0.5
   reward_output_bias: -1.0
   adv_norm: true
-  value_norm: true
 group_size: 64
 group_adv_norm: false
-external_configs:
-  cluster_config:
-    fileroot: "/storage/ray/experiments"
-  envs:
-    REAL_GPU_MEMORY_KILL_THRESHOLD: "1"
+
+# Cluster configuration
+ray_temp_path: /tmp/ray
+cluster:
+  fileroot: /tmp/ray/experiments
+  n_nodes: 32
+  n_gpus_per_node: 8
diff --git a/realhf/base/logging.py b/realhf/base/logging.py
index 4f21e47..8ae8c06 100644
--- a/realhf/base/logging.py
+++ b/realhf/base/logging.py
@@ -154,9 +154,12 @@ def log_swanlab_wandb_tensorboard(data, step=None, summary_writer=None):
         _LATEST_LOG_STEP = max(_LATEST_LOG_STEP, step)
 
     # swanlab
-    import swanlab
+    try:
+        import swanlab
 
-    swanlab.log(data, step=step)
+        swanlab.log(data, step=step)
+    except (ModuleNotFoundError, ImportError):
+        pass
 
     # wandb
     import wandb
diff --git a/realhf/impl/model/backend/sglang.py b/realhf/impl/model/backend/sglang.py
index 55ff9cb..c0ef278 100644
--- a/realhf/impl/model/backend/sglang.py
+++ b/realhf/impl/model/backend/sglang.py
@@ -452,9 +452,6 @@ class SGLangGenerationBackend(ModelBackend, SGLangConfig):
                     high=60000,
                     experiment_name=constants.experiment_name(),
                     trial_name=constants.trial_name(),
-                    lockfile_root=os.path.join(
-                        constants.get_cache_path(self.args), "ports"
-                    ),
                 ),
                 group=constants.data_parallel_group(),
             )
diff --git a/realhf/scheduler/client.py b/realhf/scheduler/client.py
index fb2f20e..71cfdf8 100644
--- a/realhf/scheduler/client.py
+++ b/realhf/scheduler/client.py
@@ -170,4 +170,4 @@ def make(args: "BaseExperimentConfig", **kwargs) -> SchedulerClient:
 
         return LocalSchedulerClient(args)
     else:
-        raise NotImplementedError(f"Scheduler {mode} not found")
+        raise NotImplementedError(f"Scheduler {args.mode} not found")
diff --git a/realhf/scheduler/evaluator.py b/realhf/scheduler/evaluator.py
index 597a75b..c12864d 100644
--- a/realhf/scheduler/evaluator.py
+++ b/realhf/scheduler/evaluator.py
@@ -8,13 +8,17 @@ import subprocess
 import time
 from typing import Any, Dict, Optional
 
-import swanlab
 import wandb
 
 import realhf.api.core.system_api as config_pkg
 from realhf.api.cli_args import BaseExperimentConfig
 from realhf.base import constants, logging
 
+try:
+    import swanlab
+except (ModuleNotFoundError, ImportError):
+    swanlab = None
+
 logger = logging.getLogger("AutomaticEvaluator", "colored")
 
 
@@ -132,7 +136,8 @@ class EvaluationStep:
             for k, v in d.items():
                 log_data[f"{data_name}_{k}"] = v
         wandb.log(log_data, step=self.global_step)
-        swanlab.log(log_data, step=self.global_step)
+        if swanlab is not None:
+            swanlab.log(log_data, step=self.global_step)
         self.status = EvaluationStepStatus.LOGGED
         logger.info(f"Logging eval result {log_data} to step {self.global_step}")
 
@@ -236,21 +241,19 @@ class AutomaticEvaluator:
     def __lazy_swanlab_init(self):
         if self.__swanlab_config.api_key:
             swanlab.login(self.__swanlab_config.api_key)
-        if self.swanlab_config.config is None:
+        if self.__swanlab_config.config is None:
             import yaml
 
             with open(
                 os.path.join(
-                    constants.LOG_ROOT,
-                    constants.experiment_name(),
-                    constants.trial_name(),
+                    constants.get_log_path(self.args),
                     "config.yaml",
                 ),
                 "r",
             ) as f:
                 __config = yaml.safe_load(f)
         else:
-            __config = self.swanlab_config.config
+            __config = self.__swanlab_config.config
         __config["FRAMEWORK"] = "AReaL"
         swanlab.init(
             project=self.__swanlab_config.project or constants.experiment_name(),
@@ -259,9 +262,7 @@ class AutomaticEvaluator:
             config=__config,
             logdir=self.__swanlab_config.logdir
             or os.path.join(
-                constants.LOG_ROOT,
-                constants.experiment_name(),
-                constants.trial_name(),
+                constants.get_log_path(self.args),
                 "swanlab",
             ),
             mode=self.__swanlab_config.mode,
@@ -329,7 +330,7 @@ class AutomaticEvaluator:
                 if not self.__wandb_initialized:
                     self.__lazy_wandb_init()
                     self.__wandb_initialized = True
-                if not self.__swanlab_initialized:
+                if not self.__swanlab_initialized and swanlab is not None:
                     self.__lazy_swanlab_init()
                     self.__swanlab_initialized = True
                 self.__eval_steps[log_step].log(self.__config)
diff --git a/realhf/system/master_worker.py b/realhf/system/master_worker.py
index cabed4c..20c7793 100644
--- a/realhf/system/master_worker.py
+++ b/realhf/system/master_worker.py
@@ -12,7 +12,6 @@ from typing import Dict
 import colorama
 import networkx as nx
 import numpy as np
-import swanlab
 import wandb
 from tensorboardX import SummaryWriter
 
@@ -38,6 +37,11 @@ from realhf.system.buffer import AsyncIOSequenceBuffer
 from realhf.system.function_executor import FunctionExecutor
 from realhf.system.model_function_call import RPCCorountineControl
 
+try:
+    import swanlab
+except (ModuleNotFoundError, ImportError):
+    swanlab = None
+
 logger = logging.getLogger("master worker", "system")
 blogger = logging.getLogger("benchmark")
 
@@ -307,15 +311,18 @@ class MasterWorker(worker_base.AsyncWorker):
 
         # swanlab init, connect to remote or local swanlab host
         if self.swanlab_config.mode != "disabled" and self.swanlab_config.api_key:
-            swanlab.login(self.swanlab_config.api_key)
+            if swanlab is not None:
+                swanlab.login(self.swanlab_config.api_key)
+            else:
+                logger.warning(
+                    "swanlab not installed but enabled. Ignore swanlab logging."
+                )
         if self.swanlab_config.config is None:
             import yaml
 
             with open(
                 os.path.join(
-                    constants.LOG_ROOT,
-                    constants.experiment_name(),
-                    constants.trial_name(),
+                    constants.get_log_path(self.args),
                     "config.yaml",
                 ),
                 "r",
@@ -324,20 +331,19 @@ class MasterWorker(worker_base.AsyncWorker):
         else:
             __config = self.swanlab_config.config
         __config["FRAMEWORK"] = "AReaL"
-        swanlab.init(
-            project=self.swanlab_config.project or constants.experiment_name(),
-            experiment_name=self.swanlab_config.name
-            or f"{constants.trial_name()}_train",
-            config=__config,
-            logdir=self.swanlab_config.logdir
-            or os.path.join(
-                constants.LOG_ROOT,
-                constants.experiment_name(),
-                constants.trial_name(),
-                "swanlab",
-            ),
-            mode=self.swanlab_config.mode,
-        )
+        if swanlab is not None:
+            swanlab.init(
+                project=self.swanlab_config.project or constants.experiment_name(),
+                experiment_name=self.swanlab_config.name
+                or f"{constants.trial_name()}_train",
+                config=__config,
+                logdir=self.swanlab_config.logdir
+                or os.path.join(
+                    constants.get_log_path(self.args),
+                    "swanlab",
+                ),
+                mode=self.swanlab_config.mode,
+            )
         # tensorboard logging
         self.__summary_writer = None
         if self.tensorboard_config.path is not None:
@@ -567,7 +573,8 @@ class MasterWorker(worker_base.AsyncWorker):
         )
 
         wandb.finish()
-        swanlab.finish()
+        if swanlab is not None:
+            swanlab.finish()
         if self.__summary_writer is not None:
             self.__summary_writer.close()
         gc.collect()
diff --git a/realhf/system/model_function_call.py b/realhf/system/model_function_call.py
index 87fb6e4..d927455 100644
--- a/realhf/system/model_function_call.py
+++ b/realhf/system/model_function_call.py
@@ -10,8 +10,6 @@ import uuid
 from collections import defaultdict
 from typing import Dict, Hashable, List, Set, Tuple
 
-import swanlab
-import wandb
 from tensorboardX import SummaryWriter
 
 import realhf.api.core.config as config_api