Fixed bug in test: numpy.cov was reconverting float32 => float64, which thus

theano/sandbox/linalg/tests/test_linalg.py

@@ -368,7 +368,7 @@ def test_spectral_radius_bound():
     f = theano.function([x], radius_bound)
 
     shp = (3, 4)
-    m = rng.rand(*shp).astype(config.floatX)
+    m = rng.rand(*shp)
     m = numpy.cov(m).astype(config.floatX)
     radius_bound_theano = f(m)