Update README.md

README.md

@@ -64,6 +64,40 @@ test: Dataset({
 ```
 
 
+## Example
+
+Here is example how to use
+```
+def pre_process(sample, processor, max_length=512, ignore_id=-100):
+    # create tensor from image
+    try:
+        image = sample["image"].convert('RGB')
+        pixel_values = processor(
+            image, return_tensors="pt").pixel_values.squeeze()
+    except Exception as e:
+        print(sample)
+        print(f"Error: {e}")
+        return {}
+
+    # tokenize document
+    input_ids = processor.tokenizer(
+        sample["text"],
+        add_special_tokens=False,
+        max_length=max_length,
+        padding="max_length",
+        truncation=True,
+        return_tensors="pt",
+    )["input_ids"].squeeze(0)
+
+    labels = input_ids.clone()
+    # model doesn't need to predict pad token
+    labels[labels == processor.tokenizer.pad_token_id] = ignore_id
+    return {"pixel_values": pixel_values, "labels": labels, "target_sequence": sample["text"]}
+
+dataset = load_dataset("achang/plot_qa", streaming=True)
+processor = DonutProcessor.from_pretrained("naver-clova-ix/donut-base")
+processed_dataset = dataset.map(partial(pre_process, processor=processor, max_length=512, ignore_id=-100))
+```
 
 ## Misc