diff --git a/src/decagon_pytorch/convolve.py b/src/decagon_pytorch/convolve.py
index d50f4b6..4ff9ee8 100644
--- a/src/decagon_pytorch/convolve.py
+++ b/src/decagon_pytorch/convolve.py
@@ -212,13 +212,25 @@ class SparseMultiDGCA(torch.nn.Module):
         activation: Callable[[torch.Tensor], torch.Tensor]=torch.nn.functional.relu,
         **kwargs) -> None:
         super().__init__(**kwargs)
+        self.input_dim = input_dim
         self.output_dim = output_dim
-        self.sparse_dgca =  [ SparseDropoutGraphConvActivation(input_dim, output_dim, adj_mat, keep_prob, activation) for adj_mat in adjacency_matrices ]
-
-    def forward(self, x: List[torch.Tensor]) -> List[torch.Tensor]:
-        out = torch.zeros(len(x), self.output_dim, dtype=x.dtype)
-        for f in self.sparse_dgca:
-            out += f(x)
+        self.adjacency_matrices = adjacency_matrices
+        self.keep_prob = keep_prob
+        self.activation = activation
+        self.sparse_dgca = None
+        self.build()
+
+    def build(self):
+        if len(self.input_dim) != len(self.adjacency_matrices):
+            raise ValueError('input_dim must have the same length as adjacency_matrices')
+        self.sparse_dgca = []
+        for input_dim, adj_mat in zip(self.input_dim, self.adjacency_matrices):
+            self.sparse_dgca.append(SparseDropoutGraphConvActivation(input_dim, self.output_dim, adj_mat, self.keep_prob, self.activation))
+
+    def forward(self, x: List[torch.Tensor]) -> torch.Tensor:
+        out = torch.zeros(len(x[0]), self.output_dim, dtype=x[0].dtype)
+        for i, f in enumerate(self.sparse_dgca):
+            out += f(x[i])
         out = torch.nn.functional.normalize(out, p=2, dim=1)
         return out
 
diff --git a/tests/decagon_pytorch/test_convolve.py b/tests/decagon_pytorch/test_convolve.py
index 210a4e5..71e1ece 100644
--- a/tests/decagon_pytorch/test_convolve.py
+++ b/tests/decagon_pytorch/test_convolve.py
@@ -236,16 +236,20 @@ def test_multi_dgca():
         assert np.all(adjacency_matrices[i].numpy() == adjacency_matrices_sparse[i].to_dense().numpy())
 
     torch.random.manual_seed(0)
-    multi_sparse = decagon_pytorch.convolve.SparseMultiDGCA(10, 10, adjacency_matrices_sparse, keep_prob=keep_prob)
+    multi_sparse = decagon_pytorch.convolve.SparseMultiDGCA([10,]*len(adjacency_matrices), 10, adjacency_matrices_sparse, keep_prob=keep_prob)
 
     torch.random.manual_seed(0)
     multi = decagon_pytorch.convolve.MultiDGCA(10, 10, adjacency_matrices, keep_prob=keep_prob)
 
+    print('len(adjacency_matrices):', len(adjacency_matrices))
+    print('len(multi_sparse.sparse_dgca):', len(multi_sparse.sparse_dgca))
+    print('len(multi.dgca):', len(multi.dgca))
+
     for i in range(len(adjacency_matrices)):
         assert np.all(multi_sparse.sparse_dgca[i].sparse_graph_conv.weight.detach().numpy() == multi.dgca[i].graph_conv.weight.detach().numpy())
 
     # torch.random.manual_seed(0)
-    latent_sparse = multi_sparse(latent_sparse)
+    latent_sparse = multi_sparse([latent_sparse,] * len(adjacency_matrices))
     # torch.random.manual_seed(0)
     latent = multi(latent)