Create README.md

README.md

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+license: cc-by-4.0
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+# COCO semantic segmentation maps
+
+This dataset contains semantic segmentation maps (monochrome images where each pixel corresponds to one of the 133 COCO categories used for panoptic segmentation). It was generated from the 2017 validation annotations using the following process:
+
+1. `git clone https://github.com/cocodataset/panopticapi` and install it.
+2. `python converters/panoptic2semantic_segmentation.py --input_json_file /data/datasets/coco/2017/annotations/panoptic_val2017.json --semantic_seg_folder semantic_val2017`
+
+## LICENSE
+
+Refer to the [original dataset](https://cocodataset.org/#termsofuse)