regression in installation

[bertsky]

In 933f7bf, you committed a requirements.txt which contains:

keras-nightly==2.5.0.dev2021032900
    # via tensorflow

However, this in turn seems to cause:

  File "/usr/local/sub-venv/headless-tf2/lib/python3.6/site-packages/keras/api/_v2/keras/__init__.py", line 10, in <module>
    from keras import __version__
  File "/usr/local/sub-venv/headless-tf2/lib/python3.6/site-packages/keras/__init__.py", line 25, in <module>
    from keras import models
  File "/usr/local/sub-venv/headless-tf2/lib/python3.6/site-packages/keras/models.py", line 20, in <module>
    from keras import metrics as metrics_module
  File "/usr/local/sub-venv/headless-tf2/lib/python3.6/site-packages/keras/metrics.py", line 27, in <module>
    from keras import activations
  File "/usr/local/sub-venv/headless-tf2/lib/python3.6/site-packages/keras/activations.py", line 20, in <module>
    from keras.layers import advanced_activations
  File "/usr/local/sub-venv/headless-tf2/lib/python3.6/site-packages/keras/layers/__init__.py", line 24, in <module>
    from keras.engine.input_layer import Input
  File "/usr/local/sub-venv/headless-tf2/lib/python3.6/site-packages/keras/engine/input_layer.py", line 21, in <module>
    from keras.engine import base_layer
  File "/usr/local/sub-venv/headless-tf2/lib/python3.6/site-packages/keras/engine/base_layer.py", line 41, in <module>
    from keras.mixed_precision import loss_scale_optimizer
  File "/usr/local/sub-venv/headless-tf2/lib/python3.6/site-packages/keras/mixed_precision/loss_scale_optimizer.py", line 1180, in <module>
    mixed_precision._register_wrapper_optimizer_cls(optimizer_v2.OptimizerV2,
AttributeError: module 'tensorflow.python.training.experimental.mixed_precision' has no attribute '_register_wrapper_optimizer_cls'

Two questions:

• why the fixed requirements.txt (and no dynamic dep specs)?
• why not allow TF higher than 2.5 as well?

[bertsky]

• why the fixed requirements.txt (and no dynamic dep specs)?

(this affects install time / pip dependency resolution)

• why not allow TF higher than 2.5 as well?

(this comes from requirements.in, and affects run time; so one cannot even try to run at a different version)

@crater2150 can you please take a look? (this is spoiling ocrd_all deployment atm)

[crater2150]

• why the fixed requirements.txt (and no dynamic dep specs)?
• why not allow TF higher than 2.5 as well?

Because the dynamic dep specs broke stuff too not so long ago (OCR-D/ocrd_all#287 (comment)).

I can't really debug this, as I am no longer paid to work on this and I have limited free time. But be free to send any pull requests. If you'd like, I can also add you to the gitlab org, so you can commit directly.