Update meshexpert.py

meshexpert.py

@@ -1,3 +1,17 @@
-# Source code for MeshExpert from cell 39f2782d
-# Please replace this with the actual code from the notebook cell.
+from transformers import PretrainedConfig, PreTrainedModel, AutoModelForCausalLM # Import AutoModelForCausalLM
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+import math
+from transformers.modeling_outputs import CausalLMOutputWithPast # Import the necessary output class
 
+# Define a single Expert within the Mesh
+class MeshExpert(nn.Module):
+    def __init__(self, config: MeshConfig):
+        super().__init__()
+        self.fc1 = nn.Linear(config.hidden_size, config.expert_intermediate_size)
+        self.gelu = nn.GELU() # Using GELU as an example activation
+        self.fc2 = nn.Linear(config.expert_intermediate_size, config.hidden_size)
+
+    def forward(self, x):
+        return self.fc2(self.gelu(self.fc1(x)))