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| import torch | |
| import time | |
| from torch.utils.data import DataLoader, RandomSampler, SequentialSampler | |
| from multiprocessing import cpu_count | |
| from transformers import ( | |
| AutoConfig, | |
| AutoModelForQuestionAnswering, | |
| AutoTokenizer, | |
| squad_convert_examples_to_features | |
| ) | |
| from transformers.data.processors.squad import SquadResult, SquadV2Processor, SquadExample | |
| from transformers.data.metrics.squad_metrics import compute_predictions_logits | |
| def run_prediction(question_texts, context_text, model_path, n_best_size=1): | |
| ### Setting hyperparameters | |
| max_seq_length = 512 | |
| doc_stride = 256 | |
| n_best_size = n_best_size | |
| max_query_length = 64 | |
| max_answer_length = 512 | |
| do_lower_case = False | |
| null_score_diff_threshold = 0.0 | |
| def to_list(tensor): | |
| return tensor.detach().cpu().tolist() | |
| config_class, model_class, tokenizer_class = (AutoConfig, AutoModelForQuestionAnswering, AutoTokenizer) | |
| config = config_class.from_pretrained(model_path) | |
| tokenizer = tokenizer_class.from_pretrained(model_path, do_lower_case=True, use_fast=False) | |
| model = model_class.from_pretrained(model_path, config=config) | |
| device = torch.device("cuda" if torch.cuda.is_available() else "cpu") | |
| model.to(device) | |
| processor = SquadV2Processor() | |
| examples = [] | |
| timer = time.time() | |
| for i, question_text in enumerate(question_texts): | |
| example = SquadExample( | |
| qas_id=str(i), | |
| question_text=question_text, | |
| context_text=context_text, | |
| answer_text=None, | |
| start_position_character=None, | |
| title="Predict", | |
| answers=None, | |
| ) | |
| examples.append(example) | |
| print(f'Created Squad Examples in {time.time()-timer} seconds') | |
| print(f'Number of CPUs: {cpu_count()}') | |
| timer = time.time() | |
| features, dataset = squad_convert_examples_to_features( | |
| examples=examples, | |
| tokenizer=tokenizer, | |
| max_seq_length=max_seq_length, | |
| doc_stride=doc_stride, | |
| max_query_length=max_query_length, | |
| is_training=False, | |
| return_dataset="pt", | |
| threads=cpu_count(), | |
| ) | |
| print(f'Converted Examples to Features in {time.time()-timer} seconds') | |
| eval_sampler = SequentialSampler(dataset) | |
| eval_dataloader = DataLoader(dataset, sampler=eval_sampler, batch_size=10) | |
| all_results = [] | |
| timer = time.time() | |
| for batch in eval_dataloader: | |
| model.eval() | |
| batch = tuple(t.to(device) for t in batch) | |
| with torch.no_grad(): | |
| inputs = { | |
| "input_ids": batch[0], | |
| "attention_mask": batch[1], | |
| "token_type_ids": batch[2], | |
| } | |
| example_indices = batch[3] | |
| outputs = model(**inputs) | |
| for i, example_index in enumerate(example_indices): | |
| eval_feature = features[example_index.item()] | |
| unique_id = int(eval_feature.unique_id) | |
| output = [to_list(output[i]) for output in outputs.to_tuple()] | |
| start_logits, end_logits = output | |
| result = SquadResult(unique_id, start_logits, end_logits) | |
| all_results.append(result) | |
| print(f'Model predictions completed in {time.time()-timer} seconds') | |
| print(all_results) | |
| output_nbest_file = None | |
| if n_best_size > 1: | |
| output_nbest_file = "nbest.json" | |
| timer = time.time() | |
| final_predictions = compute_predictions_logits( | |
| all_examples=examples, | |
| all_features=features, | |
| all_results=all_results, | |
| n_best_size=n_best_size, | |
| max_answer_length=max_answer_length, | |
| do_lower_case=do_lower_case, | |
| output_prediction_file=None, | |
| output_nbest_file=output_nbest_file, | |
| output_null_log_odds_file=None, | |
| verbose_logging=False, | |
| version_2_with_negative=True, | |
| null_score_diff_threshold=null_score_diff_threshold, | |
| tokenizer=tokenizer | |
| ) | |
| print(f'Logits converted to predictions in {time.time()-timer} seconds') | |
| return final_predictions |