Adding `num_return_sequences` support for text2text generation. (#14988)
* Adding `num_return_sequences` support for text2text generation.
Co-Authored-By: Enze <pu.miao@foxmail.com>
* Update tests/test_pipelines_text2text_generation.py
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
* Update tests/test_pipelines_text2text_generation.py
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Enze <pu.miao@foxmail.com>
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>