Fix dependency issues (#5815)

* Add a second expected_loss_weights function using an alternative expectation calculation compared to previous. Integrate this op into ssd_meta_arch and losses builder. Affects files that use losses_builder.build to handle the returning of an additional element.

PiperOrigin-RevId: 219190083

* Fix dependency issues.

PiperOrigin-RevId: 222888231

* Update CODEOWNERS 

Add @masonliuw and @yinxiaoli to /research/lstm_object_detection/

research/lstm_object_detection/utils/config_util.py

@@ -24,8 +24,8 @@ import tensorflow as tf
 from google.protobuf import text_format
 from lstm_object_detection.protos import input_reader_google_pb2  # pylint: disable=unused-import
 from lstm_object_detection.protos import pipeline_pb2 as internal_pipeline_pb2
-from google3.third_party.tensorflow_models.object_detection.protos import pipeline_pb2
-from google3.third_party.tensorflow_models.object_detection.utils import config_util
+from object_detection.protos import pipeline_pb2
+from object_detection.utils import config_util
 
 
 def get_configs_from_pipeline_file(pipeline_config_path):

research/lstm_object_detection/utils/config_util_test.py

@@ -25,7 +25,7 @@ import tensorflow as tf
 from google.protobuf import text_format
 from lstm_object_detection.protos import pipeline_pb2 as internal_pipeline_pb2
 from lstm_object_detection.utils import config_util
-from google3.third_party.tensorflow_models.object_detection.protos import pipeline_pb2
+from object_detection.protos import pipeline_pb2
 
 
 def _write_config(config, config_path):