use LabelTensor, fix minor, docs

tests/test_fnn.py

@@ -0,0 +1,58 @@
+import torch
+import pytest
+
+from pina import LabelTensor
+from pina.model import FeedForward
+
+class myFeature(torch.nn.Module):
+    """
+    Feature: sin(pi*x)
+    """
+    def __init__(self):
+        super(myFeature, self).__init__()
+
+    def forward(self, x):
+        return torch.sin(torch.pi * x.extract('a'))
+
+
+data = torch.rand((20, 3))
+input_vars = ['a', 'b', 'c']
+output_vars = ['d', 'e']
+input_ = LabelTensor(data, input_vars)
+
+
+def test_constructor():
+    FeedForward(input_vars, output_vars)
+    FeedForward(3, 4)
+    FeedForward(input_vars, output_vars, extra_features=[myFeature()])
+    FeedForward(input_vars, output_vars, inner_size=10, n_layers=20)
+    FeedForward(input_vars, output_vars, layers=[10, 20, 5, 2])
+    FeedForward(input_vars, output_vars, layers=[10, 20, 5, 2],
+                func=torch.nn.ReLU)
+    FeedForward(input_vars, output_vars, layers=[10, 20, 5, 2],
+                func=[torch.nn.ReLU, torch.nn.ReLU, None, torch.nn.Tanh])
+
+
+def test_constructor_wrong():
+    with pytest.raises(RuntimeError):
+        FeedForward(input_vars, output_vars, layers=[10, 20, 5, 2],
+                    func=[torch.nn.ReLU, torch.nn.ReLU])
+
+
+def test_forward():
+    fnn = FeedForward(input_vars, output_vars)
+    output_ = fnn(input_)
+    assert output_.labels == output_vars
+
+
+def test_forward2():
+    dim_in, dim_out = 3, 2
+    fnn = FeedForward(dim_in, dim_out)
+    output_ = fnn(input_)
+    assert output_.shape == (input_.shape[0], dim_out)
+
+
+def test_forward_features():
+    fnn = FeedForward(input_vars, output_vars, extra_features=[myFeature()])
+    output_ = fnn(input_)
+    assert output_.labels == output_vars