Documentation for v0.1 version (#199)

* Adding Equations, solving typos
* improve _code.rst
* the team rst and restuctore index.rst
* fixing errors

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Co-authored-by: Dario Coscia <dariocoscia@dhcp-015.eduroam.sissa.it>

pina/model/layers/stride.py

@@ -68,11 +68,13 @@ class Stride(object):
                 direction[i] = 1
 
         # creating the stride grid
-        values_mesh = [torch.arange(0, i, step).float()
-                       for i, step in zip(domain, jumps)]
+        values_mesh = [
+            torch.arange(0, i, step).float() for i, step in zip(domain, jumps)
+        ]
 
-        values_mesh = [single * dim for single,
-                       dim in zip(values_mesh, direction)]
+        values_mesh = [
+            single * dim for single, dim in zip(values_mesh, direction)
+        ]
 
         mesh = torch.meshgrid(values_mesh)
         coordinates_mesh = [x.reshape(-1, 1) for x in mesh]