Patch release with GPTJ 16 IPUs config

[SofiaLiguori]

Patch release branch with commits 868dcf5d1405a8a0783ec826ec829274b9038b43 and 3f64184f4efa6b87fae6b970a697a297841e582c from examples-internal, see also https://github.com/graphcore/examples-internal/pull/417

Changes:

• Add config for finetuning on POD16
• Requirements changed to [email protected]_a
• Adapt named_variable_buffers to new addons API
• Readme update

Tested locally with sdk release

(3.1.0+1205_popart) sofial@neverland-poplar-31:~/workspace/dev/examples/nlp/gpt_j/popxl$ pytest
========================================================================= test session starts ==========================================================================
platform linux -- Python 3.8.10, pytest-6.2.5, py-1.11.0, pluggy-1.0.0 -- /nethome/sofial/workspace/venvs/poplar_sdk-ubuntu_20_04-3.1.0+1205-58b501c780/3.1.0+1205_popart/bin/python3
cachedir: .pytest_cache
rootdir: /nethome/sofial/workspace/dev/examples/nlp/gpt_j/popxl, configfile: pytest.ini, testpaths: tests
plugins: pythonpath-0.7.4
collected 14 items                                                                                                                                                     

tests/integration/execution/test_execution.py::TestPretraining::test_finetuning_mnli PASSED                                                                      [  7%]
tests/integration/execution/test_execution.py::TestPretraining::test_inference PASSED                                                                            [ 14%]
tests/integration/layers/test_attention_TP.py::test_attention_TP_cmp_huggingface PASSED                                                                          [ 21%]
tests/integration/layers/test_attention_TP.py::test_attention_to_hf PASSED                                                                                       [ 28%]
tests/integration/layers/test_decoder_block_TP.py::test_decoder_block_TP_cmp_huggingface PASSED                                                                  [ 35%]
tests/integration/layers/test_decoder_block_TP.py::test_decoder_to_hf PASSED                                                                                     [ 42%]
tests/integration/layers/test_feed_forward_TP.py::test_feed_forward_TP_cmp_huggingface PASSED                                                                    [ 50%]
tests/integration/layers/test_feed_forward_TP.py::test_ff_to_hf PASSED                                                                                           [ 57%]
tests/integration/layers/test_gptj_TP.py::test_gptj_TP_cmp_huggingface PASSED                                                                                    [ 64%]
tests/integration/layers/test_gptj_TP.py::test_gptj_to_hf PASSED                                                                                                 [ 71%]
tests/integration/layers/test_lm_TP.py::test_lm_TP_cmp_huggingface PASSED                                                                                        [ 78%]
tests/integration/layers/test_lm_TP.py::test_lm_to_hf PASSED                                                                                                     [ 85%]
tests/unit/test_dataloder.py::test_epochs PASSED                                                                                                                 [ 92%]
tests/unit/test_dataloder.py::test_dataloader_checkpoints PASSED                                                                                                 [100%]

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