Add Negative Prompt Feature

[donlinglok1]

Hi, I am immensely enjoying your project.

However, I have heard that there is also a "Negative Prompt" that can be input.

I have checked the diffusers source #1 and diffusers source #2, and seems your project only need few change to implement it.

This request is my change and I have tested via colab.

Thanks again for your work!

[donlinglok1]

Updates:

In current, the project are using diffusers==0.3.0, so diffusers source #1 is not valid,
the correct source code is diffusers source #3.

Therefore, only text2Img() can support negative_prompt for now, we will need for the next diffuser release (0.3.1?) to use negative_prompt on inpaint().

[lkwq007]

Seems that text2img also does not support the negative prompt with diffusers v0.3.0. Not sure when they will make the next release. https://github.com/huggingface/diffusers/blob/v0.3.0/src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion.py#L94

[donlinglok1]

Hum, you are right,

Although I can run the text2Img() + negative_prompt without any error.

But seems the negative_prompt didn't work correctly, I will do some tests again. Thank you for your reply!

[donlinglok1]

Great news that diffusers just released 0.4.0 last night, I have tested the code in colab with test-case:

prompt=Bouquet of Roses
negative_prompt=red rose

[lkwq007]

Looks good to me.
Thanks for this timely PR!