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cpu dreams

My laptop CPU became an artist over night:

a cyberpunk cityscape

What we see here is actual unique artwork my CPU created over a timeframe of approx. 12 minutes. The only thing I input to was the text string a cyberpunk cityscape and let Stable Diffusion do the rest. It’s beautiful and detailed. I actually love it!

Stable Diffusion is a sophisticated, brand new deep learning model by Stability.ai. It’s already on par with the earlier released, proprietary AI image generators DALL-E 2 or Imagen. With a powerful difference: you can actually create AI images yourself for free on your local machine. Usually done by your GPU, or like in my case above, your CPU, if capable.

I put four hours of work into it yesterday to setup my machine and create more artwork. My CPU came up with more beautiful cyberpunk cityscape examples with the following text string, a cyberpunk cityscape in neonlights at night, see the gallery here:

I’m lucky to own a powerful notebook CPU from 2020 with a graphics processor built in. I don’t know if this made a difference or not, the results surely are true for what I anticipated and surpassed my expectations.

But how can you join the CPU AI image generation yourself?

I had time to write it down yesterday and am happy to share it here for free for anyone who might be interested to do this with her/his Linux machine.

Step 0: Create a working directory in your /home

Step 1: Install Python

sudo apt-get update*
yes | sudo apt-get install python3.8*

*could be the installation of Python 3.8 is different to the one mentioned above. In this case just use your package manager of your Linux distribution to get the program installed on your machine.

Step 2: Install Miniconda

wget https://repo.anaconda.com/miniconda/Miniconda3-py38_4.12.0-Linux-x86_64.sh
bash Miniconda3-py38_4.12.0-Linux-x86_64.sh

Step 3: Clone the Stable Diffusion Repository

git clone https://github.com/CompVis/stable-diffusion.git
cd stable-diffusion/

Hint: Repo above only works for graphics cards >= 7GB (V)RAM! Thus…

Step 4: Download the ZIP, extract, copy and paste the contents following optimised version of Stable Diffusion in the folder above:


Step 5: Create Conda Environment

conda env create -f environment.yaml
conda activate ldm

Step 6: Download Stable Diffusion Weights

curl https://www.googleapis.com/storage/v1/b/aai-blog-files/o/sd-v1-4.ckpt?alt=media > sd-v1-4.ckpt

Step 7: Content blocker deactivation (needed in case your output images are green or black only)
* find and open file pipeline_stable_diffusion.py
* below image = image.cpu().permute(0, 2, 3, 1).numpy() replace anything with this and save the file:

# run safety checker
#safety_cheker_input = self.feature_extractor(self.numpy_to_pil(image), return_tensors=“pt“).to(self.device)
#image, has_nsfw_concept = self.safety_checker(images=image, clip_input=safety_cheker_input.pixel_values)

if output_type == „pil“:
image = self.numpy_to_pil(image)

#return {„sample“: image, „nsfw_content_detected“: has_nsfw_concept}
return {„sample“: image, „nsfw_content_detected“: False}

Step 8: Generate AI images with the CPU

python optimizedSD/optimized_txt2img.py –device cpu –precision full –prompt „a cyberpunk cityscape“ –H 512 –W 512 –n_iter 1 –n_samples 1 –ddim_steps 50

That’s it! By default you find your created images in the outputs folder. You can enter your deserved text string in „“ and let your machine do the rest. Feel free to share some of your works in the comments if this tutorial helped you.

P.S.: I also had the chance to create GPU images yesterday with this method. The only difference is by removing the part –device cpu from the command line code you find in step eight. It will be much faster but to me the option to let your CPU create actual artwork was very much appreciated and may not be well known for future AI generation images through Stable Diffusion. I had some very nice results. Will share more of my work in future entries here on gizmeo.eu so stay tuned!

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