Bug fix in GNO and implementation of tests

tests/test_model/test_gno.py

@@ -0,0 +1,127 @@
+import pytest
+import torch
+from pina.graph import KNNGraph
+from pina.model import GNO
+from torch_geometric.data import Batch
+
+x = [torch.rand(100, 6) for _ in range(10)]
+pos = [torch.rand(100, 3) for _ in range(10)]
+graph = KNNGraph(x=x, pos=pos, build_edge_attr=True, k=6)
+input_ = Batch.from_data_list(graph.data)
+
+
+
+@pytest.mark.parametrize(
+    "shared_weights",
+    [
+        True,
+        False
+    ]
+)
+def test_constructor(shared_weights):
+    lifting_operator = torch.nn.Linear(6, 16)
+    projection_operator = torch.nn.Linear(16, 3)
+    GNO(lifting_operator=lifting_operator,
+        projection_operator=projection_operator,
+        edge_features=3,
+        internal_layers=[16, 16],
+        shared_weights=shared_weights)
+
+    GNO(lifting_operator=lifting_operator,
+        projection_operator=projection_operator,
+        edge_features=3,
+        inner_size=16,
+        internal_n_layers=10,
+        shared_weights=shared_weights)
+
+    int_func = torch.nn.Softplus
+    ext_func = torch.nn.ReLU
+
+    GNO(lifting_operator=lifting_operator,
+        projection_operator=projection_operator,
+        edge_features=3,
+        internal_n_layers=10,
+        shared_weights=shared_weights,
+        internal_func=int_func,
+        external_func=ext_func)
+
+
+@pytest.mark.parametrize(
+    "shared_weights",
+    [
+        True,
+        False
+    ]
+)
+def test_forward_1(shared_weights):
+    lifting_operator = torch.nn.Linear(6, 16)
+    projection_operator = torch.nn.Linear(16, 3)
+    model = GNO(lifting_operator=lifting_operator,
+                projection_operator=projection_operator,
+                edge_features=3,
+                internal_layers=[16, 16],
+                shared_weights=shared_weights)
+    output_ = model(input_)
+    assert output_.shape == torch.Size([1000, 3])
+
+@pytest.mark.parametrize(
+    "shared_weights",
+    [
+        True,
+        False
+    ]
+)
+def test_forward_2(shared_weights):
+    lifting_operator = torch.nn.Linear(6, 16)
+    projection_operator = torch.nn.Linear(16, 3)
+    model = GNO(lifting_operator=lifting_operator,
+                projection_operator=projection_operator,
+                edge_features=3,
+                inner_size=32,
+                internal_n_layers=2,
+                shared_weights=shared_weights)
+    output_ = model(input_)
+    assert output_.shape == torch.Size([1000, 3])
+
+@pytest.mark.parametrize(
+    "shared_weights",
+    [
+        True,
+        False
+    ]
+)
+def test_backward(shared_weights):
+    lifting_operator = torch.nn.Linear(6, 16)
+    projection_operator = torch.nn.Linear(16, 3)
+    model = GNO(lifting_operator=lifting_operator,
+                projection_operator=projection_operator,
+                edge_features=3,
+                internal_layers=[16, 16],
+                shared_weights=shared_weights)
+    input_.x.requires_grad = True
+    output_ = model(input_)
+    l = torch.mean(output_)
+    l.backward()
+    assert input_.x.grad.shape == torch.Size([1000, 6])
+
+@pytest.mark.parametrize(
+    "shared_weights",
+    [
+        True,
+        False
+    ]
+)
+def test_backward_2(shared_weights):
+    lifting_operator = torch.nn.Linear(6, 16)
+    projection_operator = torch.nn.Linear(16, 3)
+    model = GNO(lifting_operator=lifting_operator,
+                projection_operator=projection_operator,
+                edge_features=3,
+                inner_size=32,
+                internal_n_layers=2,
+                shared_weights=shared_weights)
+    input_.x.requires_grad = True
+    output_ = model(input_)
+    l = torch.mean(output_)
+    l.backward()
+    assert input_.x.grad.shape == torch.Size([1000, 6])