clearer model variable naming: Tapas
Author: kamalkraj
Pull request: yes

# What does this PR do?

clearer model variable naming: Tapas

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Fixes # (issue)


## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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- [ ] Did you write any new necessary tests?


## Who can review?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
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Models:

- albert, bert, xlm: @LysandreJik
- blenderbot, bart, marian, pegasus, encoderdecoder,  t5: @patrickvonplaten, @patil-suraj
- longformer, reformer, transfoxl, xlnet: @patrickvonplaten
- fsmt: @stas00
- funnel: @sgugger
- gpt2: @patrickvonplaten, @LysandreJik
- rag: @patrickvonplaten, @lhoestq
- tensorflow: @LysandreJik

Library:

- benchmarks: @patrickvonplaten
- deepspeed: @stas00
- ray/raytune: @richardliaw, @amogkam
- text generation: @patrickvonplaten
- tokenizers: @n1t0, @LysandreJik
- trainer: @sgugger
- pipelines: @LysandreJik

Documentation: @sgugger

HF projects:

- datasets: [different repo](https://github.com/huggingface/datasets)
- rust tokenizers: [different repo](https://github.com/huggingface/tokenizers)

Examples:

- maintained examples (not research project or legacy): @sgugger, @patil-suraj
- research_projects/bert-loses-patience: @JetRunner
- research_projects/distillation: @VictorSanh

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@gante 

Comments:
_The documentation is not available anymore as the PR was closed or merged._

```bash
============================================================================= test session starts =============================================================================
platform darwin -- Python 3.8.9, pytest-6.2.5, py-1.11.0, pluggy-1.0.0 -- /Users/kamal.raj/.virtualenvs/transformers/bin/python
cachedir: .pytest_cache
hypothesis profile 'default' -> database=DirectoryBasedExampleDatabase('/Users/kamal.raj/Documents/GitHub/transformers/.hypothesis/examples')
rootdir: /Users/kamal.raj/Documents/GitHub/transformers, configfile: setup.cfg
plugins: xdist-2.4.0, timeout-2.0.1, dash-2.0.0, hypothesis-6.31.3, forked-1.3.0, typeguard-2.13.2
collected 49 items                                                                                                                                                            

tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_attention_outputs <- tests/test_modeling_tf_common.py PASSED                                              [  2%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_compile_tf_model <- tests/test_modeling_tf_common.py PASSED                                               [  4%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_config PASSED                                                                                             [  6%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_determinism <- tests/test_modeling_tf_common.py PASSED                                                    [  8%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_for_masked_lm PASSED                                                                                      [ 10%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_for_question_answering PASSED                                                                             [ 12%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_for_sequence_classification PASSED                                                                        [ 14%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_forward_signature <- tests/test_modeling_tf_common.py PASSED                                              [ 16%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_generate_with_headmasking <- tests/test_modeling_tf_common.py PASSED                                      [ 18%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_headmasking <- tests/test_modeling_tf_common.py PASSED                                                    [ 20%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_hidden_states_output <- tests/test_modeling_tf_common.py PASSED                                           [ 22%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_initialization <- tests/test_modeling_tf_common.py PASSED                                                 [ 24%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_inputs_embeds <- tests/test_modeling_tf_common.py PASSED                                                  [ 26%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_keras_save_load <- tests/test_modeling_tf_common.py PASSED                                                [ 28%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_keyword_and_dict_args <- tests/test_modeling_tf_common.py PASSED                                          [ 30%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_lm_head_model_beam_search_generate_dict_outputs <- tests/test_modeling_tf_common.py PASSED                [ 32%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_lm_head_model_no_beam_search_generate_dict_outputs <- tests/test_modeling_tf_common.py PASSED             [ 34%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_lm_head_model_random_beam_search_generate <- tests/test_modeling_tf_common.py PASSED                      [ 36%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_lm_head_model_random_no_beam_search_generate <- tests/test_modeling_tf_common.py PASSED                   [ 38%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_load_with_mismatched_shapes <- tests/test_modeling_tf_common.py PASSED                                    [ 40%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_loss_computation <- tests/test_modeling_tf_common.py PASSED                                               [ 42%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_model PASSED                                                                                              [ 44%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_model_common_attributes <- tests/test_modeling_tf_common.py PASSED                                        [ 46%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_model_main_input_name <- tests/test_modeling_tf_common.py PASSED                                          [ 48%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_model_outputs_equivalence <- tests/test_modeling_tf_common.py PASSED                                      [ 51%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_numpy_arrays_inputs <- tests/test_modeling_tf_common.py PASSED                                            [ 53%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_onnx_compliancy <- tests/test_modeling_tf_common.py PASSED                                                [ 55%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_onnx_runtime_optimize <- tests/test_modeling_tf_common.py PASSED                                          [ 57%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_pt_tf_model_equivalence <- tests/test_modeling_tf_common.py SKIPPED (test is PT+TF test)                  [ 59%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_resize_token_embeddings <- tests/test_modeling_tf_common.py PASSED                                        [ 61%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_save_load <- tests/test_modeling_tf_common.py PASSED                                                      [ 63%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelTest::test_save_load_config <- tests/test_modeling_tf_common.py PASSED                                               [ 65%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelIntegrationTest::test_inference_classification_head PASSED                                                           [ 67%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelIntegrationTest::test_inference_masked_lm SKIPPED (Model not available yet)                                          [ 69%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelIntegrationTest::test_inference_no_head PASSED                                                                       [ 71%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelIntegrationTest::test_inference_question_answering_head_conversational PASSED                                        [ 73%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelIntegrationTest::test_inference_question_answering_head_conversational_absolute_embeddings PASSED                    [ 75%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelIntegrationTest::test_inference_question_answering_head_strong_supervision PASSED                                    [ 77%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelIntegrationTest::test_inference_question_answering_head_weak_supervision PASSED                                      [ 79%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasModelIntegrationTest::test_training_question_answering_head_weak_supervision PASSED                                       [ 81%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasUtilsTest::test_flatten PASSED                                                                                            [ 83%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasUtilsTest::test_gather PASSED                                                                                             [ 85%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasUtilsTest::test_gather_vectorized PASSED                                                                                  [ 87%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasUtilsTest::test_product_index PASSED                                                                                      [ 89%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasUtilsTest::test_range_index_map PASSED                                                                                    [ 91%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasUtilsTest::test_reduce_max PASSED                                                                                         [ 93%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasUtilsTest::test_reduce_mean PASSED                                                                                        [ 95%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasUtilsTest::test_reduce_sum PASSED                                                                                         [ 97%]
tests/tapas/test_modeling_tf_tapas.py::TFTapasUtilsTest::test_reduce_sum_vectorized PASSED                                                                              [100%]

============================================================================== warnings summary ===============================================================================
../../../.virtualenvs/transformers/lib/python3.8/site-packages/flatbuffers/compat.py:19
  /Users/kamal.raj/.virtualenvs/transformers/lib/python3.8/site-packages/flatbuffers/compat.py:19: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
    import imp

-- Docs: https://docs.pytest.org/en/stable/warnings.html
============================================================ 47 passed, 2 skipped, 1 warning in 105.84s (0:01:45) =============================================================
```
@gante