[Wait to merge] [Bart] Rename lm_labels argument to masked_lm_labels
While the docstring correctly lists masked_lm_labels, forward
was expecting lm_labels. Renaming to match BERT and the rest of
the MLM-based models


Could you make sure the kwarg in `examples/summarization/bart/run_bart_sum.py` is correct? Thanks!<|||||># [Codecov](https://codecov.io/gh/huggingface/transformers/pull/3500?src=pr&el=h1) Report
> Merging [#3500](https://codecov.io/gh/huggingface/transformers/pull/3500?src=pr&el=desc) into [master](https://codecov.io/gh/huggingface/transformers/commit/601ac5b1dc1438f00d09696588f2deb0f045ae3b&el=desc) will **increase** coverage by `0.50%`.
> The diff coverage is `100.00%`.

[![Impacted file tree graph](https://codecov.io/gh/huggingface/transformers/pull/3500/graphs/tree.svg?width=650&height=150&src=pr&token=9qOlN6Hb1c)](https://codecov.io/gh/huggingface/transformers/pull/3500?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master    #3500      +/-   ##
==========================================
+ Coverage   77.79%   78.30%   +0.50%     
==========================================
  Files         100      100              
  Lines       17051    17051              
==========================================
+ Hits        13265    13351      +86     
+ Misses       3786     3700      -86     
```


| [Impacted Files](https://codecov.io/gh/huggingface/transformers/pull/3500?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [src/transformers/modeling\_bart.py](https://codecov.io/gh/huggingface/transformers/pull/3500/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ19iYXJ0LnB5) | `97.58% <100.00%> (ø)` | |
| [src/transformers/modeling\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/3500/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ191dGlscy5weQ==) | `91.94% <0.00%> (+0.13%)` | :arrow_up: |
| [src/transformers/data/processors/squad.py](https://codecov.io/gh/huggingface/transformers/pull/3500/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9kYXRhL3Byb2Nlc3NvcnMvc3F1YWQucHk=) | `56.49% <0.00%> (+27.59%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/huggingface/transformers/pull/3500?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/huggingface/transformers/pull/3500?src=pr&el=footer). Last update [601ac5b...70f9258](https://codecov.io/gh/huggingface/transformers/pull/3500?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
<|||||>> Could you make sure the kwarg in `examples/summarization/bart/run_bart_sum.py` is correct? Thanks!

Sure, updated all occurrences on that file<|||||>@dougian : we are going to merge/adopt this after a few other PRs are merged in order to coordinate the signature with T5's signature. Thanks for your contribution!
<|||||>Fixed on master by other PRs, closing. Thanks!