Fix Camembert and XLM-R `decode` method- Fix NER pipeline alignement
Fix `decode` method for Camembert and XLM-R
Simplify alignement method for NER pipeline
# [Codecov](https://codecov.io/gh/huggingface/transformers/pull/2244?src=pr&el=h1) Report
> Merging [#2244](https://codecov.io/gh/huggingface/transformers/pull/2244?src=pr&el=desc) into [master](https://codecov.io/gh/huggingface/transformers/commit/ceae85ad60da38cacb14eca49f752669a4fe31dc?src=pr&el=desc) will **decrease** coverage by `0.04%`.
> The diff coverage is `58.82%`.

[![Impacted file tree graph](https://codecov.io/gh/huggingface/transformers/pull/2244/graphs/tree.svg?width=650&token=9qOlN6Hb1c&height=150&src=pr)](https://codecov.io/gh/huggingface/transformers/pull/2244?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master    #2244      +/-   ##
==========================================
- Coverage   79.92%   79.88%   -0.05%     
==========================================
  Files         131      131              
  Lines       19469    19480      +11     
==========================================
  Hits        15561    15561              
- Misses       3908     3919      +11
```


| [Impacted Files](https://codecov.io/gh/huggingface/transformers/pull/2244?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [transformers/commands/run.py](https://codecov.io/gh/huggingface/transformers/pull/2244/diff?src=pr&el=tree#diff-dHJhbnNmb3JtZXJzL2NvbW1hbmRzL3J1bi5weQ==) | `0% <0%> (ø)` | :arrow_up: |
| [transformers/file\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/2244/diff?src=pr&el=tree#diff-dHJhbnNmb3JtZXJzL2ZpbGVfdXRpbHMucHk=) | `67.1% <100%> (-1.76%)` | :arrow_down: |
| [transformers/tokenization\_camembert.py](https://codecov.io/gh/huggingface/transformers/pull/2244/diff?src=pr&el=tree#diff-dHJhbnNmb3JtZXJzL3Rva2VuaXphdGlvbl9jYW1lbWJlcnQucHk=) | `36.61% <50%> (+0.79%)` | :arrow_up: |
| [transformers/tokenization\_xlm\_roberta.py](https://codecov.io/gh/huggingface/transformers/pull/2244/diff?src=pr&el=tree#diff-dHJhbnNmb3JtZXJzL3Rva2VuaXphdGlvbl94bG1fcm9iZXJ0YS5weQ==) | `37.68% <50%> (+0.75%)` | :arrow_up: |
| [transformers/pipelines.py](https://codecov.io/gh/huggingface/transformers/pull/2244/diff?src=pr&el=tree#diff-dHJhbnNmb3JtZXJzL3BpcGVsaW5lcy5weQ==) | `67.94% <71.42%> (+0.09%)` | :arrow_up: |
| [transformers/tests/pipelines\_test.py](https://codecov.io/gh/huggingface/transformers/pull/2244/diff?src=pr&el=tree#diff-dHJhbnNmb3JtZXJzL3Rlc3RzL3BpcGVsaW5lc190ZXN0LnB5) | `98.03% <0%> (-0.99%)` | :arrow_down: |

------

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> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/huggingface/transformers/pull/2244?src=pr&el=footer). Last update [ceae85a...655fd06](https://codecov.io/gh/huggingface/transformers/pull/2244?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
