Create README.md

README.md

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+---
+task_categories:
+- text-to-image
+pretty_name: Pexels Portrait
+---
+# Pexels Portrait
+
+This dataset was collected using the official Pexels API: https://www.pexels.com/api/
+
+All fields returned by the API are recorded, except the source image URL. Only the original image URL is recorded, since other variants can be retrieved on-the-fly by modifying the URL parameters. The "alt" field can be used for simple text-to-image training/finetuning.
+
+Image files are not provided. You need to download the image files by yourself. Example of downloading image files:
+
+```python
+def download(_id: int, url: str):
+    # corresponds to "large"
+    params = dict(auto="compress", cs="tinysrgb", dpr=2, h=650, w=940)
+    resp = requests.get(url, params=params)
+    resp.raise_for_status()
+
+    save_path = save_dir / str(_id)[-3:] / f"{_id}.webp"
+    save_path.parent.mkdir(exist_ok=True, parents=True)
+    open(save_path, "wb").write(resp.content)
+```
+
+Photos without human faces were removed with [YOLOv8-Face](https://github.com/hpc203/yolov8-face-landmarks-opencv-dnn), using score threshold 0.7.
+
+More samples might be added in the future.