Remove unused import and do not use "is" for string comparison

tensorflow/python/compiler/tensorrt/trt_convert.py

@@ -18,7 +18,6 @@ from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function
 
-import collections
 import os
 import platform
 import tempfile
@@ -193,7 +192,7 @@ class TrtConversionParams(object):
       DEFAULT_TRT_CONVERSION_PARAMS._replace(...)
     """
     for k, v in vars().items():
-      if v and (k is not "self"):
+      if v and (k != "self"):
         setattr(self, k, v)
     return self