make test restect floatX.

theano/sandbox/linalg/tests/test_linalg.py

@@ -66,7 +66,7 @@ def test_cholesky():
 
 def test_cholesky_grad():
     rng = numpy.random.RandomState(utt.fetch_seed())
-    r = rng.randn(5, 5)
+    r = rng.randn(5, 5).astype(config.floatX)
     pd = numpy.dot(r, r.T)
     # Check the default.
     yield utt.verify_grad, cholesky, [pd], 3, rng