Update README.md

README.md

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 # SD v1-5 square Model Card
 The original source of this model is : [runwayml/stable-diffusion-v1-5](https://huggingface.co/runwayml/stable-diffusion-v1-5). 
-This model is just optimized and converted to Intermediate Representation (IR) to run on Intel's Hardware - CPU, GPU, NPU. 
+This model is just optimized and converted to Intermediate Representation (IR) using OpenVino's Model Optimizer and POT tool to run on Intel's Hardware - CPU, GPU, NPU.
 
 We have FP16 and INT8 versions of the model. Please note currently only unet model is quantized to int8.