diff --git a/project/algorithms/image_classifier.py b/project/algorithms/image_classifier.py
index 789fab7c..2abd7e5e 100644
--- a/project/algorithms/image_classifier.py
+++ b/project/algorithms/image_classifier.py
@@ -65,6 +65,9 @@ def __init__(
 
     def configure_model(self):
         # Save this for PyTorch-Lightning to infer the input/output shapes of the network.
+        if self.network is not None:
+            logger.info("Network is already instantiated.")
+            return
         self.example_input_array = torch.zeros((self.datamodule.batch_size, *self.datamodule.dims))
         with torch.random.fork_rng():
             # deterministic weight initialization
diff --git a/project/algorithms/jax_image_classifier.py b/project/algorithms/jax_image_classifier.py
index 4d8ad3d2..c3fe012e 100644
--- a/project/algorithms/jax_image_classifier.py
+++ b/project/algorithms/jax_image_classifier.py
@@ -22,6 +22,8 @@
 from project.datamodules.image_classification.mnist import MNISTDataModule
 from project.utils.typing_utils import HydraConfigFor
 
+logger = logging.getLogger(__name__)
+
 
 def flatten(x: jax.Array) -> jax.Array:
     return x.reshape((x.shape[0], -1))
@@ -95,6 +97,9 @@ def __init__(
         self.save_hyperparameters(ignore=["datamodule"])
 
     def configure_model(self):
+        if self.network is not None:
+            logger.info("Network is already instantiated.")
+            return
         example_input = torch.zeros(
             (self.datamodule.batch_size, *self.datamodule.dims),
         )
diff --git a/project/algorithms/jax_ppo_test.py b/project/algorithms/jax_ppo_test.py
index d90a6c4d..05f2c0f1 100644
--- a/project/algorithms/jax_ppo_test.py
+++ b/project/algorithms/jax_ppo_test.py
@@ -532,8 +532,13 @@ def __init__(
         self.num_train_iterations = np.ceil(self.learner.hp.eval_freq / iteration_steps).astype(
             int
         )
+        self.actor_params: torch.nn.ParameterList | None = None
+        self.critic_params: torch.nn.ParameterList | None = None
 
     def configure_model(self):
+        if self.actor_params is not None:
+            logger.info("Networks are already instantiated.")
+            return
         self.actor_params = torch.nn.ParameterList(
             jax.tree.leaves(
                 jax.tree.map(
diff --git a/project/algorithms/text_classifier.py b/project/algorithms/text_classifier.py
index 1d9ea4e1..213721c6 100644
--- a/project/algorithms/text_classifier.py
+++ b/project/algorithms/text_classifier.py
@@ -1,3 +1,4 @@
+import logging
 from datetime import datetime
 
 import evaluate
@@ -14,6 +15,8 @@
 from project.datamodules.text.text_classification import TextClassificationDataModule
 from project.utils.typing_utils import HydraConfigFor
 
+logger = logging.getLogger(__name__)
+
 
 class TextClassifier(LightningModule):
     """Example of a lightning module used to train a huggingface model for text classification."""
@@ -51,6 +54,9 @@ def __init__(
         self.save_hyperparameters(ignore=["datamodule"])
 
     def configure_model(self) -> None:
+        if self.network is not None:
+            logger.info("Network is already instantiated.")
+            return
         with torch.random.fork_rng(devices=[self.device]):
             # deterministic weight initialization
             torch.manual_seed(self.init_seed)
diff --git a/project/experiment.py b/project/experiment.py
index 4ab69459..6a5945c6 100644
--- a/project/experiment.py
+++ b/project/experiment.py
@@ -112,16 +112,10 @@ def train_lightning(
     algorithm: lightning.LightningModule,
     /,
     *,
-    trainer: lightning.Trainer | None,
+    trainer: lightning.Trainer,
     datamodule: lightning.LightningDataModule | None = None,
     config: Config,
 ):
-    # Create the Trainer from the config.
-    if trainer is None:
-        _trainer = instantiate_trainer(config.trainer)
-        assert isinstance(_trainer, lightning.Trainer)
-        trainer = _trainer
-
     # Train the model using the dataloaders of the datamodule:
     # The Algorithm gets to "wrap" the datamodule if it wants to. This could be useful for
     # example in RL, where we need to set the actor to use in the environment, as well as