diff --git a/configure.py b/configure.py
index ada342a..ad585fa 100644
--- a/configure.py
+++ b/configure.py
@@ -943,6 +943,35 @@
   write_action_env_to_bazelrc('TF_CUDNN_VERSION', tf_cudnn_version)
 
 
+def is_cuda_compatible(lib, cuda_ver, cudnn_ver):
+  """Check compatibility between given library and cudnn/cudart libraries."""
+  ldd_bin = which('ldd') or '/usr/bin/ldd'
+  ldd_out = run_shell([ldd_bin, lib], True)
+  ldd_out = ldd_out.split(os.linesep)
+  cudnn_pattern = re.compile('.*libcudnn.so\\.?(.*) =>.*$')
+  cuda_pattern = re.compile('.*libcudart.so\\.?(.*) =>.*$')
+  cudnn = None
+  cudart = None
+  cudnn_ok = True  # assume no cudnn dependency by default
+  cuda_ok = True  # assume no cuda dependency by default
+  for line in ldd_out:
+    if 'libcudnn.so' in line:
+      cudnn = cudnn_pattern.search(line)
+      cudnn_ok = False
+    elif 'libcudart.so' in line:
+      cudart = cuda_pattern.search(line)
+      cuda_ok = False
+  if cudnn and len(cudnn.group(1)):
+    cudnn = convert_version_to_int(cudnn.group(1))
+  if cudart and len(cudart.group(1)):
+    cudart = convert_version_to_int(cudart.group(1))
+  if cudnn is not None:
+    cudnn_ok = (cudnn == cudnn_ver)
+  if cudart is not None:
+    cuda_ok = (cudart == cuda_ver)
+  return cudnn_ok and cuda_ok
+
+
 def set_tf_tensorrt_install_path(environ_cp):
   """Set TENSORRT_INSTALL_PATH and TF_TENSORRT_VERSION.
 
@@ -959,8 +988,8 @@
     raise ValueError('Currently TensorRT is only supported on Linux platform.')
 
   # Ask user whether to add TensorRT support.
-  if str(int(get_var(
-      environ_cp, 'TF_NEED_TENSORRT', 'TensorRT', False))) != '1':
+  if str(int(get_var(environ_cp, 'TF_NEED_TENSORRT', 'TensorRT',
+                     False))) != '1':
     return
 
   for _ in range(_DEFAULT_PROMPT_ASK_ATTEMPTS):
@@ -973,47 +1002,29 @@
 
     # Result returned from "read" will be used unexpanded. That make "~"
     # unusable. Going through one more level of expansion to handle that.
-    trt_install_path = os.path.realpath(
-        os.path.expanduser(trt_install_path))
+    trt_install_path = os.path.realpath(os.path.expanduser(trt_install_path))
 
     def find_libs(search_path):
       """Search for libnvinfer.so in "search_path"."""
       fl = set()
       if os.path.exists(search_path) and os.path.isdir(search_path):
-        fl.update([os.path.realpath(os.path.join(search_path, x))
-                   for x in os.listdir(search_path) if 'libnvinfer.so' in x])
+        fl.update([
+            os.path.realpath(os.path.join(search_path, x))
+            for x in os.listdir(search_path)
+            if 'libnvinfer.so' in x
+        ])
       return fl
 
     possible_files = find_libs(trt_install_path)
     possible_files.update(find_libs(os.path.join(trt_install_path, 'lib')))
     possible_files.update(find_libs(os.path.join(trt_install_path, 'lib64')))
-
-    def is_compatible(tensorrt_lib, cuda_ver, cudnn_ver):
-      """Check the compatibility between tensorrt and cudnn/cudart libraries."""
-      ldd_bin = which('ldd') or '/usr/bin/ldd'
-      ldd_out = run_shell([ldd_bin, tensorrt_lib]).split(os.linesep)
-      cudnn_pattern = re.compile('.*libcudnn.so\\.?(.*) =>.*$')
-      cuda_pattern = re.compile('.*libcudart.so\\.?(.*) =>.*$')
-      cudnn = None
-      cudart = None
-      for line in ldd_out:
-        if 'libcudnn.so' in line:
-          cudnn = cudnn_pattern.search(line)
-        elif 'libcudart.so' in line:
-          cudart = cuda_pattern.search(line)
-      if cudnn and len(cudnn.group(1)):
-        cudnn = convert_version_to_int(cudnn.group(1))
-      if cudart and len(cudart.group(1)):
-        cudart = convert_version_to_int(cudart.group(1))
-      return (cudnn == cudnn_ver) and (cudart == cuda_ver)
-
     cuda_ver = convert_version_to_int(environ_cp['TF_CUDA_VERSION'])
     cudnn_ver = convert_version_to_int(environ_cp['TF_CUDNN_VERSION'])
     nvinfer_pattern = re.compile('.*libnvinfer.so.?(.*)$')
     highest_ver = [0, None, None]
 
     for lib_file in possible_files:
-      if is_compatible(lib_file, cuda_ver, cudnn_ver):
+      if is_cuda_compatible(lib_file, cuda_ver, cudnn_ver):
         matches = nvinfer_pattern.search(lib_file)
         if len(matches.groups()) == 0:
           continue
@@ -1029,12 +1040,13 @@
     # Try another alternative from ldconfig.
     ldconfig_bin = which('ldconfig') or '/sbin/ldconfig'
     ldconfig_output = run_shell([ldconfig_bin, '-p'])
-    search_result = re.search(
-        '.*libnvinfer.so\\.?([0-9.]*).* => (.*)', ldconfig_output)
+    search_result = re.search('.*libnvinfer.so\\.?([0-9.]*).* => (.*)',
+                              ldconfig_output)
     if search_result:
       libnvinfer_path_from_ldconfig = search_result.group(2)
       if os.path.exists(libnvinfer_path_from_ldconfig):
-        if is_compatible(libnvinfer_path_from_ldconfig, cuda_ver, cudnn_ver):
+        if is_cuda_compatible(libnvinfer_path_from_ldconfig, cuda_ver,
+                              cudnn_ver):
           trt_install_path = os.path.dirname(libnvinfer_path_from_ldconfig)
           tf_tensorrt_version = search_result.group(1)
           break