Fix shuffling issue for distributed training (#3721)
Author: elk-cloner
Pull request: yes

possible solution for issue [(#3721)](https://github.com/huggingface/transformers/issues/3721)

Comments:
# [Codecov](https://codecov.io/gh/huggingface/transformers/pull/3766?src=pr&el=h1) Report
> Merging [#3766](https://codecov.io/gh/huggingface/transformers/pull/3766?src=pr&el=desc) into [master](https://codecov.io/gh/huggingface/transformers/commit/7972a4019f4bc9f85fd358f42249b90f9cd27c68&el=desc) will **decrease** coverage by `0.98%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/huggingface/transformers/pull/3766/graphs/tree.svg?width=650&height=150&src=pr&token=9qOlN6Hb1c)](https://codecov.io/gh/huggingface/transformers/pull/3766?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master    #3766      +/-   ##
==========================================
- Coverage   78.26%   77.28%   -0.99%     
==========================================
  Files         106      106              
  Lines       17928    17928              
==========================================
- Hits        14031    13855     -176     
- Misses       3897     4073     +176     
```


| [Impacted Files](https://codecov.io/gh/huggingface/transformers/pull/3766?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [src/transformers/modeling\_tf\_pytorch\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/3766/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl9weXRvcmNoX3V0aWxzLnB5) | `8.72% <0.00%> (-81.21%)` | :arrow_down: |
| [src/transformers/modeling\_roberta.py](https://codecov.io/gh/huggingface/transformers/pull/3766/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ19yb2JlcnRhLnB5) | `85.71% <0.00%> (-10.00%)` | :arrow_down: |
| [src/transformers/modeling\_ctrl.py](https://codecov.io/gh/huggingface/transformers/pull/3766/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ19jdHJsLnB5) | `95.61% <0.00%> (-2.64%)` | :arrow_down: |
| [src/transformers/modeling\_xlnet.py](https://codecov.io/gh/huggingface/transformers/pull/3766/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ194bG5ldC5weQ==) | `73.48% <0.00%> (-2.30%)` | :arrow_down: |
| [src/transformers/modeling\_tf\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/3766/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl91dGlscy5weQ==) | `91.16% <0.00%> (-1.64%)` | :arrow_down: |
| [src/transformers/modeling\_openai.py](https://codecov.io/gh/huggingface/transformers/pull/3766/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ19vcGVuYWkucHk=) | `80.20% <0.00%> (-1.35%)` | :arrow_down: |

------

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> Powered by [Codecov](https://codecov.io/gh/huggingface/transformers/pull/3766?src=pr&el=footer). Last update [7972a40...04737ae](https://codecov.io/gh/huggingface/transformers/pull/3766?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).


This looks good to me.