Added auto doc about sparse and fix this new auto doc warning.

doc/library/sparse/index.txt

@@ -53,3 +53,19 @@ There are no GPU implementations for sparse matrices implemented in Theano.
 Some documentation for sparse has been written
 `here <http://deeplearning.net/software/theano/sandbox/sparse.html>`_.
 
+
+===================================================================
+:mod:`sparse.sandbox` --  Sparse Op
+===================================================================
+
+.. module:: sparse.sandbox
+   :platform: Unix, Windows
+   :synopsis: Sparse Op
+.. moduleauthor:: LISA
+
+API
+===
+
+.. automodule:: theano.sparse.basic
+    :members:
+

theano/sparse/basic.py

@@ -79,9 +79,9 @@ def _kmap_hash(a):
 def as_sparse_variable(x, name=None):
     """
     Wrapper around SparseVariable constructor.
-    @param x:  A sparse matrix. as_sparse_variable reads dtype and format properties
-               out of this sparse matrix.
-    @return:   SparseVariable version of sp.
+    @param x: A sparse matrix. as_sparse_variable reads dtype and format
+    properties out of this sparse matrix.
+    @return: SparseVariable version of sp.
 
     @todo Verify that sp is sufficiently sparse, and raise a warning if it is not
     """