Fix hierarchi in doc. Otherwise, the **title** was not in the TOC.

doc/tutorial/extending_theano.txt

 
 .. _extending_theano:
 
-****************
+================
 Extending Theano
-****************
+================
 
 Theano Graphs
--------------
+=============
 
 - Theano works with symbolic graphs.
 - Those graphs are bi-partite graphs (graph with 2 types of nodes).
@@ -43,7 +43,7 @@ Inputs and Outputs are lists of Theano variables.
 
 
 Op Contract
------------
+===========
 
 
 .. code-block:: python
@@ -126,7 +126,7 @@ The :func:`R_op` method is needed if you want ``theano.tensor.Rop`` to
 work with your op.
 
 Op Example
-----------
+==========
 
 .. code-block:: python
 
@@ -181,13 +181,14 @@ You can try it as follows:
 
 
 How To Test it
---------------
+==============
 
 Theano has some functionalities to simplify testing. These help test the
 ``infer_shape``, ``grad`` and ``R_op`` methods. Put the following code
 in a file and execute it with the ``theano-nose`` program.
 
-**Basic Tests**
+Basic Tests
+-----------
 
 Basic tests are done by you just by using the op and checking that it
 returns the right answer. If you detect an error, you must raise an
@@ -212,7 +213,9 @@ returns the right answer. If you detect an error, you must raise an
             # Compare the result computed to the expected value.
             assert numpy.allclose(inp * 2, out)
 
-**Testing the infer_shape**
+
+Testing the infer_shape
+-----------------------
 
 When a class inherits from the ``InferShapeTester`` class, it gets the
 ``self._compile_and_check`` method that tests the op's ``infer_shape``
@@ -249,7 +252,8 @@ see it fail, you can implement an incorrect ``infer_shape``.
                                     # Op that should be removed from the graph.
                                     self.op_class)
 
-**Testing the gradient**
+Testing the gradient
+--------------------
 
 The function :ref:`verify_grad <validating_grad>`
 verifies the gradient of an op or Theano graph. It compares the
@@ -266,7 +270,8 @@ the multiplication by 2).
             theano.tests.unittest_tools.verify_grad(self.op,
                                                     [numpy.random.rand(5, 7, 2)])
 
-**Testing the Rop**
+Testing the Rop
+---------------
 
 .. TODO: repair defective links in the following paragraph
 
@@ -289,8 +294,8 @@ For instance, to verify the Rop method of the DoubleOp, you can use this:
            self.check_rop_lop(DoubleRop()(self.x), self.in_shape)
 
 
-**Testing GPU Ops**
-
+Testing GPU Ops
+---------------
 
 Ops to be executed on the GPU should inherit from the ``theano.sandbox.cuda.GpuOp`` 
 and not ``theano.Op``. This allows Theano to distinguish them. Currently, we
@@ -327,7 +332,8 @@ particular classes or even for particular tests:
 Help with the use and functionalities of ``theano-nose`` may be obtained by running
 it with the command line parameter ``--help (-h)``. 
 
-**nosetests**
+nosetests
+---------
 
 The command ``nosetests`` can also be used.  Although it lacks the useful 
 functionalities that ``theano-nose`` provides, ``nosetests`` can be called similarly
@@ -338,7 +344,8 @@ to ``theano-nose`` from any folder in Python's path like so:
 More documentation on ``nosetests`` is available here:
 `nosetests <http://readthedocs.org/docs/nose/en/latest/>`_.
 
-**In-file**
+In-file
+-------
 
 One may also add a block of code similar to the following at the end of the
 file containing a specific test of interest and run the file. In this example, the test
@@ -355,8 +362,9 @@ file containing a specific test of interest and run the file. In this example, t
 
 -------------------------------------------
 
-**Exercise**
 
+Exercise
+========
 
 Run the code of the *DoubleOp* example above.
 
@@ -414,14 +422,11 @@ don't forget to call the parent ``setUp`` function.
 For more details see :ref:`random_value_in_tests`.
 
 
-.. TODO: repair this link
-
-:download:`Solution<../extending_theano_solution_1.py>`
-
--------------------------------------------
+:download:`Solution<extending_theano_solution_1.py>`
 
 
-**A Final Note:**
+Final Note
+==========
 
 A more extensive discussion of this section's content may be found in the advanced
 tutorial :ref:`Extending Theano<extending>`