<h1 id="pixart-sigma-900m:-enhanced-text-to-image-model-gj4yiszzp">PixArt Sigma 900M: Enhanced Text-to-Image Model</h1><h2 id="model-overview-vmhq4tp6t">Model Overview</h2><p>PixArt Sigma 900M is a text-to-image generation model based on the PixArt Sigma architecture. This version has been expanded to 900M parameters, up from the original 600M base model. Two distinct variants are available:</p><ol><li><p>PixArt Sigma 900M Base (Photorealistic)</p></li><li><p>PixArt Sigma 900M Anime</p></li></ol><h2 id="key-features-c12zlm6aw">Key Features</h2><ul><li><p>900M parameters (300M more than the base model)</p></li><li><p>Improved image generation quality</p></li></ul><h2 id="technical-details-rj4517ldm">Technical Details</h2><ul><li><p>Architecture: PixArt Sigma variant</p></li><li><p>Parameter Count: 900 million</p></li><li><p>Base Model: 600M PixArt Sigma</p></li></ul><h2 id="credits-p47fj6qjv">Credits</h2><ul><li><p>Original PixArt Sigma model by <a target="_blank" rel="ugc" href="https://pixart-alpha.github.io/PixArt-sigma-project/">PIXART-Σ (</a><a target="_blank" rel="ugc" href="http://pixart-alpha.github.io">pixart-alpha.github.io</a><a target="_blank" rel="ugc" href="https://pixart-alpha.github.io/PixArt-sigma-project/">)</a></p></li><li><p>Based on <a target="_blank" rel="ugc" href="https://huggingface.co/jimmycarter">jimmycarter (Jimmy Carter) (</a><a target="_blank" rel="ugc" href="http://huggingface.co">huggingface.co</a><a target="_blank" rel="ugc" href="https://huggingface.co/jimmycarter">)</a> adaptation of PixArt Sigma</p></li></ul><h2 id="comfyui-compatibility-p1lvuwjng">ComfyUI Compatibility</h2><p>To use this model in ComfyUI, a custom node is required as ComfyUI does not natively support this variant at the moment. The necessary custom node can be found at: <a target="_blank" rel="ugc" href="https://github.com/city96/ComfyUI_ExtraModels">https://github.com/city96/ComfyUI_ExtraModels</a></p><h2 id="required-components-xqklk7yuo">Required Components</h2><ol><li><p><strong>T5 Model</strong>:</p><ul><li><p>Download from: <a target="_blank" rel="ugc" href="https://huggingface.co/PixArt-alpha/PixArt-Sigma-XL-2-1024-MS/tree/main/text_encoder">PixArt-alpha/PixArt-Sigma-XL-2-1024-MS at main (</a><a target="_blank" rel="ugc" href="http://huggingface.co">huggingface.co</a><a target="_blank" rel="ugc" href="https://huggingface.co/PixArt-alpha/PixArt-Sigma-XL-2-1024-MS/tree/main/text_encoder">)</a> on Hugging Face</p></li><li><p>Naming Convention: Ensure the T5 model files are named exactly as they appear in the repository</p></li><li><p>Important: Remove any prepended "text_encoder" from the filenames if present</p></li></ul></li></ol><h2 id="setup-instructions-gpg6l85v4">Setup Instructions</h2><ol><li><p>Download the T5 model from the Hugging Face repository linked above</p></li><li><p>Rename the T5 model files if necessary, removing any "text_encoder" prefix</p></li><li><p>Install the custom ComfyUI node from the GitHub repository</p></li><li><p>Place all model files in the appropriate directories as specified in the ComfyUI_ExtraModels documentation<br /><br /></p></li></ol>

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