Update README.md

README.md

@@ -105,18 +105,28 @@ This subset of the dataset contains only urls to the images, their descriptions
 
 To download the images from the urls, you may do something like this:
 ```python
-import datasets
+from datasets import load_dataset, DownloadManager, Image
 
-ds = datasets.load_dataset("1aurent/unsplash-lite-palette")
+ds = load_dataset("1aurent/unsplash-lite-palette")
+ds = ds["train"].select(list(range(100)))
 
-def download_image(example, dl_manager):
-    url = example["url"]
-    filename = dl_manager.download(url)
-    return {"image": filename}
+def download_image(url: str | list[str], dl_manager: DownloadManager):
+  filename = dl_manager.download(url)
+  return {"image": filename}
 
-dl_manager = datasets.DownloadManager()
-ds = ds.map(download_image, fn_kwargs={"dl_manager": dl_manager}, num_proc=32)
-ds = ds.cast_column("image", datasets.Image())
+ds = ds.map(
+  function=download_image,
+  input_columns=["url"],
+  fn_kwargs={
+    "dl_manager": DownloadManager(),
+  },
+  batched=True,
+  num_proc=6,
+)
+ds = ds.cast_column(
+  column="image",
+  feature=Image(),
+)
 ```
 
 ![](https://unsplash.com/blog/content/images/2020/08/footer-alt.jpg)