diff --git a/configs/modules.json b/configs/modules.json
index 377de3a0d..76c59f9d0 100644
--- a/configs/modules.json
+++ b/configs/modules.json
@@ -1,6 +1,6 @@
 {
-    "PositionalEncoder": {
-        "name": "encoder_0",
+    "encoder_0": {
+        "class": "PositionalEncoder",
         "inputs": [
             "x"
         ],
@@ -8,8 +8,9 @@
             "output_dim": 8
         }
     },
-    "MLP": {
-        "name": "mlp_0",
+
+    "mlp_0": {
+        "class": "MLP",
         "inputs": [
             "encoder_0", "encoder_0"
         ],
diff --git a/mattport/nerf/graph.py b/mattport/nerf/graph.py
index ee0cf3efc..843cde7c2 100644
--- a/mattport/nerf/graph.py
+++ b/mattport/nerf/graph.py
@@ -1,9 +1,11 @@
 """
 The Graph module contains all trainable parameters.
 """
+import importlib
 from dataclasses import dataclass
+
 from torch import nn
-from mattport.nerf.modules.positional_encoder import PositionalEncoder
+
 
 @dataclass
 class GraphInputs:
@@ -21,29 +23,35 @@ class Graph(nn.Module):
 
     def __init__(self, modules_config: dict) -> None:
         super().__init__()
-
-
-        # # for key in ...
-        # temp = graph_config.positional_encoder
-        # PositionalEncoder(name=temp.name, name=temp.inputs, )
-        # self.modules = {}
-        # self.modules["name"] = MLP()
-
-
         self.modules = {}
+        self.module_order = self.get_module_order(modules_config)
+        for module_name, module_dict in modules_config.items():
+            module = getattr(importlib.import_module("mattport.nerf.modules"), module_dict["class_name"])
+            if module_dict["class_name"] != "Encoding":
+                in_dim = 0
+                for inputs in module_dict["inputs"]:
+                    in_dim += modules_config[inputs]["meta_data"]["out_dim"]
+                module_dict["meta_data"]["in_dim"] = in_dim
+            self.modules[module_name] = module(**module_dict["meta_data"])
 
+    def get_module_order(self, modules_config: list):
+        """Generates a graph to determine the order in which the graph should execute
 
-        self.encoder_0 = Encoder()
-        self.mlp_0 = MLP()
+        Args:
+            modules_config (list): _description_
 
-
-        raise NotImplementedError
+        Returns:
+            _type_: _description_
+        """
+        # raise NotImplementedError
+        return modules_config
 
     def forward(self, x):
-        """_summary_"""
+        """_summary_
+
+        Args:
+            x (_type_): _description_
+        """
         # raise NotImplementedError
-        
-        for name in queue: # "encoder_0",
-            # assert name.output is not None
+        for name in self.module_order:
             x = self.modules[name](x)
-        # self.mlp_0
\ No newline at end of file
diff --git a/mattport/nerf/modules/__init__.py b/mattport/nerf/modules/__init__.py
new file mode 100644
index 000000000..d59de93cb
--- /dev/null
+++ b/mattport/nerf/modules/__init__.py
@@ -0,0 +1,2 @@
+from .encoding import Encoding
+from .mlp import MLP
\ No newline at end of file
diff --git a/mattport/nerf/modules/encoding.py b/mattport/nerf/modules/encoding.py
index 98daf6180..821c663c5 100644
--- a/mattport/nerf/modules/encoding.py
+++ b/mattport/nerf/modules/encoding.py
@@ -8,9 +8,9 @@ from torchtyping import TensorType
 class Encoding(nn.Module):
     """Encode an input tensor. Intended to be subclassed"""
 
-     def __init__(self, name: str, inputs: list, meta_data: dict) -> None:
+    def __init__(self, out_dim: int) -> None:
         super().__init__()
-        raise NotImplementedError
+        # raise NotImplementedError
 
     def encode(self, in_tensor: TensorType[..., "input_dim"]) -> TensorType[..., "output_dim"]:
         """Encodes an input tensor.
diff --git a/mattport/nerf/modules/mlp.py b/mattport/nerf/modules/mlp.py
index 94ac56e0e..6c47264da 100644
--- a/mattport/nerf/modules/mlp.py
+++ b/mattport/nerf/modules/mlp.py
@@ -1,4 +1,7 @@
+from typing import Optional
+
 from torch import nn
+from torchtyping import TensorType
 
 
 class MLP(nn.Module):
@@ -10,7 +13,7 @@ class MLP(nn.Module):
         out_dim: int,
         num_layers: int,
         layer_width: int,
-        activation: Optional[nn.Module] = nn.ReLU,
+        activation: Optional[nn.Module] = None,
         out_activation: Optional[nn.Module] = None,
     ) -> None:
         """Initialize mulilayer perceptron.
@@ -24,6 +27,7 @@ class MLP(nn.Module):
             out_activation (Optional[nn.Module], optional): output activation function. Defaults to None.
         """
         super().__init__()
+        self.in_dim = in_dim
         layers = []
         for i in range(num_layers):
             if i == 0:
diff --git a/tests/nerf/test_graph.py b/tests/nerf/test_graph.py
new file mode 100644
index 000000000..5dbf9e468
--- /dev/null
+++ b/tests/nerf/test_graph.py
@@ -0,0 +1,43 @@
+import pytest
+
+from mattport.nerf.graph import Graph
+
+
+def create_basic_graph():
+    """Create basic test for creating a graph
+
+    Returns:
+        dict: module definitions for constructing a graph
+    """
+    basic_graph = {
+        "encoder_0": {"class_name": "Encoding", "inputs": ["x"], "meta_data": {"out_dim": 8}},
+        "mlp_0": {
+            "class_name": "MLP",
+            "inputs": ["encoder_0", "encoder_0"],
+            "meta_data": {"in_dim": 0, "out_dim": 1, "num_layers": 2, "layer_width": 3},
+        },
+        "mlp_1": {
+            "class_name": "MLP",
+            "inputs": ["mlp_0"],
+            "meta_data": {"in_dim": 4, "out_dim": 5, "num_layers": 6, "layer_width": 7},
+        },
+    }
+    return basic_graph
+
+
+def test_graph_init():
+    """test modules dictionary is instantiated properly"""
+    test_graph = Graph(create_basic_graph())
+    assert test_graph.modules is not None
+    assert type(test_graph.modules['encoder_0']).__name__ == 'Encoding'
+    assert type(test_graph.modules['mlp_0']).__name__ == 'MLP'
+    assert type(test_graph.modules['mlp_1']).__name__ == 'MLP'
+
+
+def test_input_dimension():
+    """test module input dimension calculation"""
+    test_graph = Graph(create_basic_graph())
+    assert not hasattr(test_graph.modules['encoder_0'], 'in_dim')
+    assert test_graph.modules['mlp_0'].in_dim == 16
+    assert test_graph.modules['mlp_1'].in_dim == 1
+    
\ No newline at end of file