remove useless import, fix logger name and auto indent fix.

theano/tensor/tensor_grad.py

@@ -9,8 +9,7 @@ __docformat__ = "restructuredtext en"
 
 import __builtin__
 import logging
-_logger = logging.getLogger('theano.gradient')
-import sys
+_logger = logging.getLogger('theano.tensor.tensor_grad')
 
 import numpy #for numeric_grad
 
@@ -603,4 +602,3 @@ class GradientError(Exception):
               self.rel_err, self.rel_tol)
 
 verify_grad.E_grad = GradientError
-