Make box_list_ops_test.py work with the C API enabled.

The C API improves static shape inference, making more errors caught at graph construction time instead of runtime.

PiperOrigin-RevId: 190095450

research/object_detection/core/box_list_ops_test.py

@@ -17,6 +17,7 @@
 import numpy as np
 import tensorflow as tf
 from tensorflow.python.framework import errors
+from tensorflow.python.framework import ops
 
 from object_detection.core import box_list
 from object_detection.core import box_list_ops
@@ -509,6 +510,10 @@ class BoxListOpsTest(tf.test.TestCase):
       with self.assertRaises(ValueError):
         box_list_ops.sort_by_field(boxes, 'misc')
 
+      if ops._USE_C_API:
+        with self.assertRaises(ValueError):
+          box_list_ops.sort_by_field(boxes, 'weights')
+      else:
         with self.assertRaisesWithPredicateMatch(errors.InvalidArgumentError,
                                                  'Incorrect field size'):
           sess.run(box_list_ops.sort_by_field(boxes, 'weights').get())