diff --git a/mattport/nerf/optimizer.py b/mattport/nerf/optimizer.py
deleted file mode 100644
index 6afefcb05..000000000
--- a/mattport/nerf/optimizer.py
+++ /dev/null
@@ -1,30 +0,0 @@
-"""
-Optimizer class.
-"""
-
-from torch import optim
-
-
-class Optimizer:
-    """_summary_"""
-
-    def __init__(self, params: dict, lr: float):
-        """
-        Args:
-            params (dict): _description_
-            lr (float): Learning rate.
-        """
-        self.optimizer = optim.Adam(params)
-        self.lr = lr
-
-    def test(self):
-        """_summary_
-
-        Raises:
-            NotImplementedError: _description_
-        """
-        raise NotImplementedError
-
-    def test2(self):
-        """Summary"""
-        raise NotImplementedError
diff --git a/mattport/nerf/optimizers.py b/mattport/nerf/optimizers.py
new file mode 100644
index 000000000..641e0e632
--- /dev/null
+++ b/mattport/nerf/optimizers.py
@@ -0,0 +1,49 @@
+"""
+Optimizers class.
+"""
+
+from typing import Dict, List
+from omegaconf import DictConfig
+import torch
+from torch.nn import Parameter
+
+
+class Optimizers:
+    """_summary_"""
+
+    def __init__(self, config: DictConfig, param_groups: Dict[str, List[Parameter]]):
+        """_summary_
+
+        Args:
+            config (DictConfig): _description_
+            param_dict (Dict[str, List[Parameter]]): _description_
+        """
+        # TODO() add param_name `learning_rate`` and `weight_decay`, etc... to config file
+        self.config = config
+        self.optimizers = {}
+        self.schedulers = {}
+        for param_name, params in param_groups.items():
+            optimizer = getattr(torch.optim, config.param_name.optimizer.type)
+            kwargs = {k: v for k, v in config.param_name.optimizer.items() if k != "type"}
+            self.optimizers[param_name] = optimizer(params, **kwargs)
+            if config.param_name.scheduler:
+                scheduler = getattr(torch.optim.lr_scheduler, config.param_name.scheduler.type)
+                kwargs = {k: v for k, v in config.param_name.scheduler.items() if k != "type"}
+                self.schedulers[param_name] = scheduler(optimizer, **kwargs)
+
+    def optimizer_step(self, param_name: str) -> None:
+        """fetch and step corresponding optimizer
+
+        Args:
+            param_name (str): name of optimizer to step forward
+        """
+        self.optimizers[param_name].step()
+
+    def scheduler_step(self, param_name: str) -> None:
+        """fetch and step corresponding scheduler
+
+        Args:
+            param_name (str): name of scheduler to step forward
+        """
+        if self.config.param_name.scheduler:
+            self.schedulers[param_name].step()