laion webdataset example code

environment.yaml

@@ -22,6 +22,7 @@ dependencies:
     - einops==0.3.0
     - torch-fidelity==0.3.0
     - transformers==4.3.1
+    - webdataset==0.2.5
     - -e git+https://github.com/CompVis/taming-transformers.git@master#egg=taming-transformers
     - -e git+https://github.com/openai/CLIP.git@main#egg=clip
     - -e .

ldm/data/laion.py

@@ -0,0 +1,36 @@
+import webdataset as wds
+from PIL import Image
+import io
+import os
+from tqdm import tqdm
+
+if __name__ == "__main__":
+    url = "pipe:aws s3 cp s3://s-datasets/laion5b/laion2B-data/000000.tar -"
+    dataset = wds.WebDataset(url)
+    example = next(iter(dataset))
+    for k in example:
+        print(k, type(example[k]))
+
+    print(example["__key__"])
+    for k in ["json", "txt"]:
+        print(example[k].decode())
+
+    image = Image.open(io.BytesIO(example["jpg"]))
+    outdir = "tmp"
+    os.makedirs(outdir, exist_ok=True)
+    image.save(os.path.join(outdir, example["__key__"]+".png"))
+
+
+    def load_example(example):
+        return {
+            "key": example["__key__"],
+            "image": Image.open(io.BytesIO(example["jpg"])),
+            "text": example["txt"].decode(),
+        }
+
+
+    for i, example in tqdm(enumerate(dataset)):
+        ex = load_example(example)
+        print(ex["image"].size, ex["text"])
+        if i >= 100:
+            break