# Improve image quality with deterministic generation A common way to improve the quality of generated images is with *deterministic batch generation*, generate a batch of images and select one image to improve with a more detailed prompt in a second round of inference. The key is to pass a list of [`torch.Generator`](https://pytorch.org/docs/stable/generated/torch.Generator.html#generator)'s to the pipeline for batched image generation, and tie each `Generator` to a seed so you can reuse it for an image. Let's use [`runwayml/stable-diffusion-v1-5`](runwayml/stable-diffusion-v1-5) for example, and generate several versions of the following prompt: ```py prompt = "Labrador in the style of Vermeer" ``` Instantiate a pipeline with [`DiffusionPipeline.from_pretrained`] and place it on a GPU (if available): ```python >>> from diffusers import DiffusionPipeline >>> pipe = DiffusionPipeline.from_pretrained("runwayml/stable-diffusion-v1-5", torch_dtype=torch.float16) >>> pipe = pipe.to("cuda") ``` Now, define four different `Generator`'s and assign each `Generator` a seed (`0` to `3`) so you can reuse a `Generator` later for a specific image: ```python >>> import torch >>> generator = [torch.Generator(device="cuda").manual_seed(i) for i in range(4)] ``` Generate the images and have a look: ```python >>> images = pipe(prompt, generator=generator, num_images_per_prompt=4).images >>> images ```  In this example, you'll improve upon the first image - but in reality, you can use any image you want (even the image with double sets of eyes!). The first image used the `Generator` with seed `0`, so you'll reuse that `Generator` for the second round of inference. To improve the quality of the image, add some additional text to the prompt: ```python prompt = [prompt + t for t in [", highly realistic", ", artsy", ", trending", ", colorful"]] generator = [torch.Generator(device="cuda").manual_seed(0) for i in range(4)] ``` Create four generators with seed `0`, and generate another batch of images, all of which should look like the first image from the previous round! ```python >>> images = pipe(prompt, generator=generator).images >>> images ```