diff --git a/tianshou/highlevel/config.py b/tianshou/highlevel/config.py
index e3f74b2..bca77e0 100644
--- a/tianshou/highlevel/config.py
+++ b/tianshou/highlevel/config.py
@@ -1,11 +1,13 @@
 from dataclasses import dataclass
 
+from tianshou.utils.string import ToStringMixin
+
 
 @dataclass
-class SamplingConfig:
+class SamplingConfig(ToStringMixin):
     """Sampling, epochs, parallelization, buffers, collectors, and batching."""
 
-    # TODO: What are reasonable defaults?
+    # TODO: What are the most reasonable defaults?
     num_epochs: int = 100
     step_per_epoch: int = 30000
     batch_size: int = 64
diff --git a/tianshou/highlevel/env.py b/tianshou/highlevel/env.py
index 6fdc970..d11eddc 100644
--- a/tianshou/highlevel/env.py
+++ b/tianshou/highlevel/env.py
@@ -138,7 +138,7 @@ class DiscreteEnvironments(Environments):
         return EnvType.DISCRETE
 
 
-class EnvFactory(ABC):
+class EnvFactory(ToStringMixin, ABC):
     @abstractmethod
     def create_envs(self, config: PersistableConfigProtocol | None = None) -> Environments:
         pass
diff --git a/tianshou/highlevel/params/policy_params.py b/tianshou/highlevel/params/policy_params.py
index 9d8cd53..8d64537 100644
--- a/tianshou/highlevel/params/policy_params.py
+++ b/tianshou/highlevel/params/policy_params.py
@@ -21,6 +21,7 @@ from tianshou.highlevel.params.lr_scheduler import LRSchedulerFactory
 from tianshou.highlevel.params.noise import NoiseFactory
 from tianshou.policy.modelfree.pg import TDistributionFunction
 from tianshou.utils import MultipleLRSchedulers
+from tianshou.utils.string import ToStringMixin
 
 
 @dataclass(kw_only=True)
@@ -227,7 +228,7 @@ class GetParamTransformersProtocol(Protocol):
 
 
 @dataclass
-class Params(GetParamTransformersProtocol):
+class Params(GetParamTransformersProtocol, ToStringMixin):
     def create_kwargs(self, data: ParamTransformerData) -> dict[str, Any]:
         params = asdict(self)
         for transformer in self._get_param_transformers():