hi, I faced the following error, while I was running the algorithm on two gpus. tensorflow=1.9.0, using docker container.

[Hussain70]

[0507 11:40:09 @training.py:50] [DataParallel] Training a model of 2 towers.
[0507 11:40:09 @interface.py:31] Automatically applying QueueInput on the DataFlow.
[0507 11:40:09 @interface.py:43] Automatically applying StagingInput on the DataFlow.
Traceback (most recent call last):

launch_train_with_config(config, SyncMultiGPUTrainer(nr_tower))

File "/usr/local/lib/python3.6/dist-packages/tensorpack/train/interface.py", line 90, in launch_train_with_config
model.get_input_signature(), input,
File "/usr/local/lib/python3.6/dist-packages/tensorpack/utils/argtools.py", line 200, in wrapper
value = func(*args, **kwargs)
File "/usr/local/lib/python3.6/dist-packages/tensorpack/graph_builder/model_desc.py", line 86, in get_input_signature
inputs = self.inputs()
File "/usr/local/lib/python3.6/dist-packages/tensorpack/graph_builder/model_desc.py", line 116, in inputs
raise NotImplementedError()
NotImplementedError

[Yuxin Wu]

You need #23