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Fix Issue 401 Error #448

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Fix Issue 401 Error #448

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705c5d6
Expand Graph Neural Networks beyond GCN (Issue #401)
claude Nov 8, 2025
18de217
fix: resolve 22 build errors in graph neural network layers
ooples Nov 15, 2025
e405284
refactor: address 5 pr review comments with production-ready code
ooples Nov 15, 2025
23e7580
fix: implement proper gradient computation for graphattentionlayer tr…
ooples Nov 16, 2025
541725b
fix: exclude graphconvolutionallayer from lora wrapping to prevent ap…
ooples Nov 16, 2025
1f3bbd6
fix: apply dropout to attention coefficients and clear cached transfo…
ooples Nov 16, 2025
4829b48
fix: only apply dropout during training mode to prevent inference deg…
ooples Nov 16, 2025
b9f9fdd
fix: resolve merge conflict with master - add both igraphconvolutionl…
ooples Nov 16, 2025
ded3d8f
refactor: extract sageaggregatortype enum to its own file
ooples Nov 16, 2025
ff2bf25
Add Message Passing Framework and Advanced GNN Architectures (Issue #…
claude Nov 16, 2025
93b15fa
Complete Advanced GNN Architectures (Issue #401 - Phase 1 Complete)
claude Nov 16, 2025
29b8ca2
Add Graph Learning Task Frameworks and Dataset Support (Issue #401 - …
claude Nov 16, 2025
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2 changes: 2 additions & 0 deletions src/Helpers/LayerHelper.cs
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@@ -1,3 +1,5 @@
using AiDotNet.NeuralNetworks.Layers.Graph;

namespace AiDotNet.Helpers;

/// <summary>
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1 change: 1 addition & 0 deletions src/LoRA/DefaultLoRAConfiguration.cs
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Expand Up @@ -2,6 +2,7 @@
using AiDotNet.Interfaces;
using AiDotNet.LoRA.Adapters;
using AiDotNet.NeuralNetworks.Layers;
using AiDotNet.NeuralNetworks.Layers.Graph;

namespace AiDotNet.LoRA;

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2 changes: 2 additions & 0 deletions src/NeuralNetworks/GraphNeuralNetwork.cs
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using AiDotNet.NeuralNetworks.Layers.Graph;
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@coderabbitai coderabbitai bot Nov 16, 2025

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⚠️ Potential issue | 🔴 Critical

Update GraphNeuralNetwork to use IGraphConvolutionLayer<T> and the new SetAdjacencyMatrix/Forward contract

This file still hard-codes GraphConvolutionalLayer<T> and a two-argument Forward that no longer exists, and it ignores the new graph layers that implement IGraphConvolutionLayer<T>.

Concrete issues:

  • Line 532: graphLayer.Forward(current, adjacencyMatrix) no longer compiles because GraphConvolutionalLayer<T> only exposes SetAdjacencyMatrix(Tensor<T>) + Forward(Tensor<T>).
  • Lines 529–545: Only GraphConvolutionalLayer<T> is treated as a graph layer; GraphSAGELayer<T>, GraphAttentionLayer<T>, and GraphIsomorphismLayer<T> (all IGraphConvolutionLayer<T>) will be treated as standard layers and never receive an adjacency matrix. Those layers will throw at runtime when Forward sees a null adjacency.
  • Lines 689–695: Predict skips only GraphConvolutionalLayer<T> but should skip all IGraphConvolutionLayer<T> when adjacency is unavailable.
  • Lines 890–892: GetModelMetadata counts graph layers only via is GraphConvolutionalLayer<T>, so all new graph layers are misclassified as “standard”.

I recommend centralizing on IGraphConvolutionLayer<T> and decoupling adjacency from the specific implementation, e.g.:

-        foreach (var layer in Layers)
-        {
-            if (layer is GraphConvolutionalLayer<T> graphLayer)
-            {
-                current = graphLayer.Forward(current, adjacencyMatrix);
-            }
-            else if (layer is ILayer<T> standardLayer)
-            {
-                // Handle non-graph layers (e.g., Dense, Activation)
-                current = standardLayer.Forward(current);
-            }
-            else
-            {
-                throw new InvalidOperationException($"Unsupported layer type: {layer.GetType().Name}");
-            }
-            ...
-        }
+        foreach (var layer in Layers)
+        {
+            if (layer is IGraphConvolutionLayer<T> graphLayer)
+            {
+                graphLayer.SetAdjacencyMatrix(adjacencyMatrix);
+                current = layer.Forward(current);
+            }
+            else
+            {
+                current = layer.Forward(current);
+            }
+
+            if (current.Rank < 2)
+                throw new InvalidOperationException($"Layer {layer.GetType().Name} produced an invalid output shape.");
+        }

And similarly for Predict and diagnostics:

-            if (Layers[i] is GraphConvolutionalLayer<T>)
+            if (Layers[i] is IGraphConvolutionLayer<T>)
             {
                 // For graph layers, we need adjacency information which is not available
                 // Just pass through without modification for standard prediction
                 continue;
             }
-                { "GraphLayerCount", Layers.Count(l => l is GraphConvolutionalLayer<T>) },
-                { "StandardLayerCount", Layers.Count(l => !(l is GraphConvolutionalLayer<T>)) },
+                { "GraphLayerCount", Layers.Count(l => l is IGraphConvolutionLayer<T>) },
+                { "StandardLayerCount", Layers.Count(l => l is not IGraphConvolutionLayer<T>) },

This will (1) fix the compile-time break with GraphConvolutionalLayer<T>, and (2) ensure all graph layers conforming to IGraphConvolutionLayer<T> are handled consistently.

Also applies to: 529-559, 685-701, 887-893

🤖 Prompt for AI Agents 
In src/NeuralNetworks/GraphNeuralNetwork.cs around lines 529-559, 685-701 and
887-893 the code treats only GraphConvolutionalLayer<T> as a graph layer and
calls a non-existent two-argument Forward, causing compile and runtime errors;
change the checks to use the IGraphConvolutionLayer<T> interface, call
SetAdjacencyMatrix(adjacencyMatrix) on that interface (when adjacency is
present) and then call its single-argument Forward(current) (or Forward() as
defined), and update Predict and GetModelMetadata to skip/count all
IGraphConvolutionLayer<T> implementations when adjacency is unavailable; ensure
null-checks for adjacency before calling SetAdjacencyMatrix and handle layers
uniformly via the interface rather than concrete GraphConvolutionalLayer<T>.


namespace AiDotNet.NeuralNetworks;

/// <summary>
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