Upgrading tf to 2.4.0

[scarrazza]

No description provided.

[stavros11]

Have you tried our tests with tf2.4? I just tried and I get the following failure

AttributeError: module 'tensorflow' has no attribute 'python'

because we are using oom_error = tf.python.framework.errors_impl.ResourceExhaustedError in some exceptions in order to raise our own OOM error. If this is the only issue, I guess we could just find what is the corresponding error for tf2.4 and update accordingly, but we should do it in a way that does not break compatibility with older tf versions.

Note that pip still installs tf2.3.1 by default (unless we explicitly do pip install tensorflow==2.4.0rc1), which means that CI is not testing for tf2.4. We may want to update that as well.

[scarrazza]

Yes, sorry for not being more explicit, this should be a draft PR to fix this https://github.com/Quantum-TII/qibo/network/alert/requirements.txt/tensorflow/open. As soon as pypi uploads the final tf release we can go ahead and fix/test the changes.

[scarrazza]

@stavros11 this should be ready to go.

[codecov]

Codecov Report

Merging #280 (a128c68) into master (2aa3f16) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #280   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           56        56           
  Lines        10712     10716    +4     
=========================================
+ Hits         10712     10716    +4     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/qibo/tensorflow/cgates.py	100.00% <100.00%> (ø)
src/qibo/tensorflow/circuit.py	100.00% <100.00%> (ø)
...m_operators/python/ops/qibo_tf_custom_operators.py	100.00% <100.00%> (ø)
...ators/python/ops/qibo_tf_custom_operators_grads.py	100.00% <100.00%> (ø)
src/qibo/tensorflow/distcircuit.py	100.00% <100.00%> (ø)
src/qibo/tests/test_custom_operators.py	100.00% <100.00%> (ø)

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[stavros11]

Thanks for the updates, for me it works with tf2.4 on CPU. I could not test on GPU yet due to the CUDA issue (tf2.4 requires CUDA 11 while I had 10.1).

I would expect this to be fine on GPU but if you already have a tf2.4 GPU configuration installed in any machine it would be great to confirm this by running the tests there.

[scarrazza]

@stavros11 I have checked using anaconda with python38, tf2.4.0 cuda11. Tests are passing on GPU. I will retry on other systems and then merge.

[scarrazza]

I confirm that tests are passing even with python3.9 and cuda 11.1.