Merge branch 'align_python_pep8' into 'VTM-11.0_nnvc'

.flake8

.gitlab-ci.yml

training/data_loader/data_loader.py

training/example/create_unified_dataset.py

training/example/display_patches_dataset.py

training/tools/concatenate_dataset.py

...g_scripts/NN_Intra_Prediction/dispatching_paths_to_raw.py

...ning_scripts/NN_Intra_Prediction/generating_data_intra.py

...training_scripts/NN_Intra_Prediction/training_nn_intra.py

...ning_scripts/NN_Post_Filtering/scripts/prepare_to_code.py

...ng_scripts/NN_Post_Filtering/scripts/print_overfit_cmd.py

...ng/training_scripts/NN_Post_Filtering/scripts/training.py

...ing_scripts/NN_Post_Filtering/scripts/util/file_system.py

...ining_scripts/NN_Post_Filtering/scripts/util/image_ops.py

...NN_Super_Resolution/1_generate_raw_data/bvi_dvc_to_yuv.py

...er_Resolution/1_generate_raw_data/bvi_dvc_to_yuv_frame.py

...pts/NN_Super_Resolution/1_generate_raw_data/tvd_to_yuv.py

..._Super_Resolution/1_generate_raw_data/tvd_to_yuv_frame.py

...olution/2_generate_compression_data/bvi_dvc_codec_info.py

..._Resolution/2_generate_compression_data/tvd_codec_info.py