Update README.md

README.md

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 # ddpo-alignment
 
-This model was finetuned from [Stable Diffusion v1-5](https:/runwayml/stable-diffusion-v1-5) using [DDPO](https://arxiv.org/abs/2305.13301) and a reward function that uses [LLaVA](https://llava-vl.github.io/) to measure prompt-image alignment. See [the project website](https://rl-diffusion.github.io/) for more details.
+This model was finetuned from [Stable Diffusion v1-4](https:/CompVis/stable-diffusion-v1-4) using [DDPO](https://arxiv.org/abs/2305.13301) and a reward function that uses [LLaVA](https://llava-vl.github.io/) to measure prompt-image alignment. See [the project website](https://rl-diffusion.github.io/) for more details.
 
 The model was finetuned for 200 iterations with a batch size of 256 samples per iteration. During finetuning, we used prompts of the form: "_a(n) \<animal\> \<activity\>_". We selected the animal and activity from the following lists, so try those for the best results. However, we also observed limited generalization to other prompts.