Fixed a typo and some lines too long

theano/sandbox/linalg/ops.py

@@ -696,9 +696,11 @@ def spectral_radius_bound(X, log2_exponent):
     if X.type.ndim != 2:
         raise TypeError('spectral_radius_bound requires a matrix argument', X)
     if not isinstance(log2_exponent, int):
-        raise TypeError('spectral_radius_bound requires a integer exponent', log2_exponent)
+        raise TypeError('spectral_radius_bound requires an integer exponent',
+                        log2_exponent)
     if log2_exponent <= 0:
-        raise ValueError('spectral_radius_bound requires a strictly positive exponent', log2_exponent)
+        raise ValueError('spectral_radius_bound requires a strictly positive '
+                         'exponent', log2_exponent)
     XX = X
     for i in xrange(log2_exponent):
         XX = tensor.dot(XX, XX)