Models: fp16 support in the Object Detection API [Feature request]

[eilifsolberg]

Featuere request: fp16/mixed precision support for training

• Is fp16/mixed precision support on the roadmap for training networks using the Object Detection API?
• If not, do you see any issues that needs to be resolved? It seems like you would either need to have two sets of pretrained models, our some automatic conversions between them.

System information

• What is the top-level directory of the model you are using: N/A
• Have I written custom code (as opposed to using a stock example script provided in TensorFlow): N/A
• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): N/A
• TensorFlow installed from (source or binary): binary
• TensorFlow version (use command below): 1.5.0
• Bazel version (if compiling from source): N/A
• CUDA/cuDNN version: CUDA 9.1/cuDNN v7.1.3
• GPU model and memory: Nvidia Titan V, 12GB
• Exact command to reproduce: N/A

[tensorflowbutler]

Thank you for your post. We noticed you have not filled out the following field in the issue template. Could you update them if they are relevant in your case, or leave them as N/A? Thanks.
What is the top-level directory of the model you are using
Have I written custom code
OS Platform and Distribution
TensorFlow installed from
TensorFlow version
Bazel version
CUDA/cuDNN version
GPU model and memory
Exact command to reproduce

[austinmw]

@tensorflowbutler this is a feature request
@eilifsolberg hey I agree with this, can you edit the title and add [Feature Request]

[gzchenjiajun]

How is the progress of this problem? I know that the official 2.0 code has FP16, but what about the old code? Who knows how to write? I tried but failed... @austinmw @eilifsolberg @tensorflowbutler

[eilifsolberg]

I guess there have come two solutions for this (for tensorflow >= 1.14):

• If you use Nvdia NGC containers, you should be able to just set the environment variable TF_ENABLE_AUTO_MIXED_PRECISION to '1', e.g. by

os.environ['TF_ENABLE_AUTO_MIXED_PRECISION'] = '1'

• Otherwise you need to wrap the optimizers in optimizer_builder.py like

optimizer = tf.train.experimental.enable_mixed_precision_graph_rewrite(optimizer)

See https://developer.nvidia.com/automatic-mixed-precision for more.

[gzchenjiajun]

I have modified this document yesterday and also configured the environment variable os.environ['TF_ENABLE_AUTO_MIXED_PRECISION'] = '1' as required.

 /research/object_detection/builders/optimizer_builder.py
  If optimizer_type == 'momentum_optimizer':
    Config = optimizer_config.momentum_optimizer
    Learning_rate = _create_learning_rate(config.learning_rate)
    Summary_vars.append(learning_rate)
    Optimizer = tf.train.MomentumOptimizer(
        Learning_rate,
        Momentum=config.momentum_optimizer_value)
    Optimizer = tf.train.experimental.enable_mixed_precision_graph_rewrite(optimizer)

But I found that it didn't work, I don't know what happened. The pre-training is ssd_resnet101_v1_fpn_shared_box_predictor_oid_512x512_sync.config

I was thinking that it might be caused by 2 problems:
The first is that the location of the environment variable is set incorrectly.
The second one is that this code is wrong (I feel that the root code is not implemented to this step)

@eilifsolberg

[gzchenjiajun]

I am training with gpu. I am currently upgrading to tensorflow-gpu to 1.14, but tensorflow is still 1.13. Is this related?

@eilifsolberg

[eilifsolberg]

Do you use nvidia ngc containers >= 19.03? The environment variable only works in this case, and needs to be set before model_builder.py is called. This could be done by setting the environment variable in the shell before the script is run.

Otherwise you need tensorflow 1.14 or higher and edit model_builder.py

[eilifsolberg]

You should not both set the environment variable and wrap the optimizer, only one of them.

[gzchenjiajun]

What do you mean by saying that the environment variable ['TF_ENABLE_AUTO_MIXED_PRECISION'] = '1' and tf.train.experimental.enable_mixed_precision_graph_rewrite only need to use one at the same time?
My GPU is Tesla T4, I think it should meet the requirements of nvidia ngc containers >= 19.03

I have been troubled by this problem for a long time, I really hope to solve it, thank you very much.
@eilifsolberg

[gzchenjiajun]

I ran the demo code of FP16, it is working
But in tensorflow/models object_detection, it’s been a long time or not.
@eilifsolberg

[gzchenjiajun]

Research/object_detection/builders/optimizer_builder.py:57
I added the enable_mixed_precision_graph_rewrite code on line 57 of optimizer_builder.py, but it still has no effect. Where should I write this code?

@eilifsolberg

[gzchenjiajun]

Another point is that my current training program will report this warning, which is the warning I have after I upgraded from tensorflow-gpu1.13 to 1.14.
I don't know if this has any effect.
W1024 13:45:00.194824 139707432818496 ag_logging.py:145] Entity > could not be transformed and will be executed as-is. Please report This to the AutgoGraph team. When filing the bug, set the verbosity to 10 (on Linux, export AUTOGRAPH_VERBOSITY=10) and attach the full output. Cause: converting >: AssertionError: Bad argument number for Name: 3, expecting 4
WARNING:tensorflow:Entity > could not be transformed and will be executed as-is. Please report this to the AutgoGraph team. When filing the Bug, set the verbosity to 10 (on Linux, export AUTOGRAPH_VERBOSITY=10) and attach the full output. Cause: converting >: AssertionError: Bad argument number for Name: 3, expecting 4

@eilifsolberg

[eilifsolberg]

I guess you should do it in line 76 of https://github.com/tensorflow/models/blob/master/research/object_detection/builders/optimizer_builder.py

as it will then be done independent of which optimizer you use. If you do this, don't change or set the environment variable.

Not sure about the last question, seems like this is something that you might want to report as an issue on the tensorflow github page (not tensorflow/models, but tensorflow/tensorflow).

[gzchenjiajun]

I have added the relevant code to line 76, and other requirements are also made according to your guidelines.
But it has no effect. Is there any solution?
thank
@eilifsolberg

[eilifsolberg]

Sorry, not sure what the problem might be. I think you should ask a question on StackOverflow.

[gzchenjiajun]

Ok, I haven't researched it for the time being.
Tensorflow2.0 and related code have been upgraded but still mixed precision or no effect, Stack Overflow also asked
Half precision float - fp16 support in the Object Detection API(tensorflow) - Stack Overflow
Https://stackoverflow.com/questions/58585259/fp16-support-in-the-object-detection-apitensorflow

I am using tensorRT for speeding up for the time being.

@eilifsolberg

[gzchenjiajun]

I would like to ask how you use the mixing precision to speed up your project. thank
@eilifsolberg

[apatsekin]

bump.. no updates?

[saberkun]

In Object detection TF2, the feature can be enabled with keras mix precision api: https://www.tensorflow.org/guide/mixed_precision