from transformers import BigBirdForQuestionAnswering, BigBirdTokenizerFast

# by default its in `block_sparse` mode with num_random_blocks=3, block_size=64
model = BigBirdForQuestionAnswering.from_pretrained("rubentito/bigbird-base-itc-mpdocvqa")

# you can change `attention_type` to full attention like this:
model = BigBirdForQuestionAnswering.from_pretrained("rubentito/bigbird-base-itc-mpdocvqa", attention_type="original_full")

# you can change `block_size` & `num_random_blocks` like this:
model = BigBirdForQuestionAnswering.from_pretrained("rubentito/bigbird-base-itc-mpdocvqa", block_size=16, num_random_blocks=2)

tokenizer = BigBirdTokenizerFast.from_pretrained("rubentito/bigbird-base-itc-mpdocvqa")

question = "Replace me by any text you'd like."
context = "Put some context for answering"

encoded_input = tokenizer(question, context, return_tensors='pt')
output = model(**encoded_input)

start_pos = torch.argmax(output.start_logits, dim=-1).item()
end_pos = torch.argmax(output.end_logits, dim=-1).item()

context_tokens = tokenizer.convert_ids_to_tokens(encoded_input["input_ids"][0].tolist())
answer_tokens = context_tokens[start_pos: end_pos]
answer = tokenizer.decode(tokenizer.convert_tokens_to_ids(answer_tokens))

Metrics

Average Normalized Levenshtein Similarity (ANLS)

The standard metric for text-based VQA tasks (ST-VQA and DocVQA). It evaluates the method's reasoning capabilities while smoothly penalizes OCR recognition errors. Check Scene Text Visual Question Answering for detailed information.

Answer Page Prediction Accuracy (APPA)

In the MP-DocVQA task, the models can provide the index of the page where the information required to answer the question is located. For this subtask accuracy is used to evaluate the predictions: i.e. if the predicted page is correct or not. Check Hierarchical multimodal transformers for Multi-Page DocVQA for detailed information.

Model results

Extended experimentation can be found in Table 2 of Hierarchical multimodal transformers for Multi-Page DocVQA. You can also check the live leaderboard at the RRC Portal.

Model	HF name	Parameters	ANLS	APPA
Bert large	rubentito/bert-large-mpdocvqa	334M	0.4183	51.6177
Longformer base	rubentito/longformer-base-mpdocvqa	148M	0.5287	71.1696
BigBird ITC base	rubentito/bigbird-base-itc-mpdocvqa	131M	0.4929	67.5433
LayoutLMv3 base	rubentito/layoutlmv3-base-mpdocvqa	125M	0.4538	51.9426
T5 base	rubentito/t5-base-mpdocvqa	223M	0.5050	0.0000
Hi-VT5	rubentito/hivt5-base-mpdocvqa	316M	0.6201	79.23

Citation Information

tex

@article{tito2022hierarchical,
  title={Hierarchical multimodal transformers for Multi-Page DocVQA},
  author={Tito, Rub{\`e}n and Karatzas, Dimosthenis and Valveny, Ernest},
  journal={arXiv preprint arXiv:2212.05935},
  year={2022}
}