Update README.md

experimental_models/README.md

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 ## Introduction
-Very important: All of these models only work on Nvidia GPU, they do not work on CPU or OpenCL modes.
+**Very important: All of these models require OpenPose with Nvidia GPU support**, they do not work on CPU or OpenCL modes.
 
 The `experimental_models` directory contains our experimental models, including the whole-body model from [Single-Network Whole-Body Pose Estimation](README.md#citation), as well as instructions to make it run inside [OpenPose](https://github.com/CMU-Perceptual-Computing-Lab/openpose).