No effect of 'freeze_variables' in TensorFlow Objection API when using Tensorflow 2

[eilifsolberg]

Prerequisites

Please answer the following questions for yourself before submitting an issue.

• [Y] I am using the latest TensorFlow Model Garden release and TensorFlow 2.
• [Y] I am reporting the issue to the correct repository. (Model Garden official or research directory)
• [Y] I checked to make sure that this issue has not already been filed.

1. The entire URL of the file you are using

https://github.com/tensorflow/models/tree/master/research/...

2. Describe the bug

The 'freeze_variables' parameter in https://github.com/tensorflow/models/blob/master/research/object_detection/protos/train.proto

does not seem to have any effect when using TensorFlow 2. When setting 'freeze_variables' to '.*', which should freeze all variables, the model variables still show up in detection_model.trainable_variables when performing gradient calculation in https://github.com/tensorflow/models/blob/master/research/object_detection/model_lib_v2.py

It seems like 'freeze_variables' is only used in the old tf1 code https://github.com/tensorflow/models/blob/master/research/object_detection/model_lib.py

[mohammedayub44]

I'm looking for something similar to reduce my train time. Any update on this ?

[di0002ya]

Any update?