Add BART converter and Chinese BART models

[gongel]

PR types

New features

PR changes

Others

Description

• Add BART model converter from torch to paddlepaddle
• Add Chinese BART models
  • fnlp/bart-base-chinese
  • fnlp/bart-large-chinese
  • uer/bart-base-chinese-cluecorpussmall
  • uer/bart-chinese-6-960-cluecorpussmall
  • uer/bart-large-chinese-cluecorpussmall
  • uer/bart-chinese-4-768-cluecorpussmall
  • HIT-TMG/dialogue-bart-base-chinese
  • HIT-TMG/dialogue-bart-large-chinese-DuSinc
  • HIT-TMG/dialogue-bart-large-chinese
  • shibing624/bart4csc-base-chinese
  • IDEA-CCNL/Randeng-BART-139M-QG-Chinese
  • IDEA-CCNL/Randeng-BART-759M-Chinese-BertTokenizer
  • IDEA-CCNL/Randeng-BART-139M-SUMMARY
  • IDEA-CCNL/Randeng-BART-139M

Use like

from paddlenlp.transformers import BartForConditionalGeneration
model = BartForConditionalGeneration.from_pretrained("IDEA-CCNL/Randeng-BART-139M")

[CLAassistant]

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[paddle-bot]

Thanks for your contribution!

[gongel]

后续可支持AutoConverter，黑客马拉松选手也可参考该实现。

[codecov]

Codecov Report

Merging #4636 (1a6fca8) into develop (18be55d) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #4636      +/-   ##
===========================================
- Coverage    42.10%   42.06%   -0.05%     
===========================================
  Files          433      434       +1     
  Lines        61796    61862      +66     
===========================================
+ Hits         26019    26021       +2     
- Misses       35777    35841      +64     

Impacted Files	Coverage Δ
paddlenlp/transformers/bart/converter.py	0.00% <0.00%> (ø)
paddlenlp/utils/downloader.py	62.55% <0.00%> (+0.88%)	⬆️

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[sijunhe]

模型自动转化能力由AutoConverter承载，请参考#4477 添加bart结构