How to use this model directly from the
from transformers import AutoTokenizer, AutoModelForQuestionAnswering tokenizer = AutoTokenizer.from_pretrained("valhalla/bart-large-finetuned-squadv1") model = AutoModelForQuestionAnswering.from_pretrained("valhalla/bart-large-finetuned-squadv1")
This is bart-large model finetuned on SQuADv1 dataset for question answering task
BART was propsed in the paper BART: Denoising Sequence-to-Sequence Pre-training for Natural Language Generation, Translation, and Comprehension. BART is a seq2seq model intended for both NLG and NLU tasks.
To use BART for question answering tasks, we feed the complete document into the encoder and decoder, and use the top hidden state of the decoder as a representation for each word. This representation is used to classify the token. As given in the paper bart-large achives comparable to ROBERTa on SQuAD. Another notable thing about BART is that it can handle sequences with upto 1024 tokens.
|num attetion heads||16|
|on disk size||1.63GB|
The results are actually slightly worse than given in the paper. In the paper the authors mentioned that bart-large achieves 88.8 EM and 94.6 F1
from transformers import BartTokenizer, BartForQuestionAnswering import torch tokenizer = BartTokenizer.from_pretrained('valhalla/bart-large-finetuned-squadv1') model = BartForQuestionAnswering.from_pretrained('valhalla/bart-large-finetuned-squadv1') question, text = "Who was Jim Henson?", "Jim Henson was a nice puppet" encoding = tokenizer(question, text, return_tensors='pt') input_ids = encoding['input_ids'] attention_mask = encoding['attention_mask'] start_scores, end_scores = model(input_ids, attention_mask=attention_mask, output_attentions=False)[:2] all_tokens = tokenizer.convert_ids_to_tokens(input_ids) answer = ' '.join(all_tokens[torch.argmax(start_scores) : torch.argmax(end_scores)+1]) answer = tokenizer.convert_tokens_to_ids(answer.split()) answer = tokenizer.decode(answer) #answer => 'a nice puppet'