some fix to sparse when scipy is not available.

theano/sparse/__init__.py

-import sys,scipy
+import sys
 
 enable_sparse=True
-if not scipy.__version__.startswith('0.7.'):
-    sys.stderr.write("WARNING: scipy version = %s. We request version >=0.7.0 for the sparse code as it has bugs fixed in the sparse matrix code.\n" % scipy.__version__)
-    enable_sparse=False
 
+try:
+    import scipy
+    if not scipy.__version__.startswith('0.7.'):
+        sys.stderr.write("WARNING: scipy version = %s. We request version >=0.7.0 for the sparse code as it has bugs fixed in the sparse matrix code.\n" % scipy.__version__)
+        enable_sparse=False
+except ImportError:
+    enable_sparse=False
+    sys.stderr.write("WARNING: scipy can't be imported. We disable the sparse matrix code.")
 if enable_sparse:
     from basic import *
 

theano/sparse/tests/test_basic.py

-import scipy.sparse
 from theano.sparse import *
 
 from nose.plugins.skip import SkipTest
 if enable_sparse == False:
     raise SkipTest('Optional package sparse disabled')
+import scipy.sparse
 
 import random, time
 import unittest