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| import json | |
| import os | |
| from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple, Union | |
| import numpy as np | |
| import torch | |
| import torch.nn as nn | |
| from transformers import Seq2SeqTrainer | |
| from ...extras.constants import IGNORE_INDEX | |
| from ...extras.logging import get_logger | |
| if TYPE_CHECKING: | |
| from transformers.trainer import PredictionOutput | |
| logger = get_logger(__name__) | |
| class CustomSeq2SeqTrainer(Seq2SeqTrainer): | |
| r""" | |
| Inherits PeftTrainer to compute generative metrics such as BLEU and ROUGE. | |
| """ | |
| def prediction_step( | |
| self, | |
| model: nn.Module, | |
| inputs: Dict[str, Union[torch.Tensor, Any]], | |
| prediction_loss_only: bool, | |
| ignore_keys: Optional[List[str]] = None, | |
| ) -> Tuple[Optional[float], Optional[torch.Tensor], Optional[torch.Tensor]]: | |
| r""" | |
| Removes the prompt part in the generated tokens. | |
| Subclass and override to inject custom behavior. | |
| """ | |
| labels = inputs["labels"].detach().clone() if "labels" in inputs else None # backup labels | |
| if self.args.predict_with_generate: | |
| assert self.tokenizer.padding_side == "left", "This method only accepts left-padded tensor." | |
| prompt_len, label_len = inputs["input_ids"].size(-1), inputs["labels"].size(-1) | |
| if prompt_len > label_len: | |
| inputs["labels"] = self._pad_tensors_to_target_len(inputs["labels"], inputs["input_ids"]) | |
| if label_len > prompt_len: # truncate the labels instead of padding the inputs (llama2 fp16 compatibility) | |
| inputs["labels"] = inputs["labels"][:, :prompt_len] | |
| loss, generated_tokens, _ = super().prediction_step( # ignore the returned labels (may be truncated) | |
| model, inputs, prediction_loss_only=prediction_loss_only, ignore_keys=ignore_keys | |
| ) | |
| if generated_tokens is not None and self.args.predict_with_generate: | |
| generated_tokens[:, :prompt_len] = self.tokenizer.pad_token_id | |
| generated_tokens = generated_tokens.contiguous() | |
| return loss, generated_tokens, labels | |
| def _pad_tensors_to_target_len(self, src_tensor: torch.Tensor, tgt_tensor: torch.Tensor) -> torch.Tensor: | |
| r""" | |
| Pads the tensor to the same length as the target tensor. | |
| """ | |
| assert self.tokenizer.pad_token_id is not None, "Pad token is required." | |
| padded_tensor = self.tokenizer.pad_token_id * torch.ones_like(tgt_tensor) | |
| padded_tensor[:, -src_tensor.shape[-1] :] = src_tensor # adopt left-padding | |
| return padded_tensor.contiguous() # in contiguous memory | |
| def save_predictions(self, predict_results: "PredictionOutput") -> None: | |
| r""" | |
| Saves model predictions to `output_dir`. | |
| A custom behavior that not contained in Seq2SeqTrainer. | |
| """ | |
| if not self.is_world_process_zero(): | |
| return | |
| output_prediction_file = os.path.join(self.args.output_dir, "generated_predictions.jsonl") | |
| logger.info(f"Saving prediction results to {output_prediction_file}") | |
| labels = np.where( | |
| predict_results.label_ids != IGNORE_INDEX, predict_results.label_ids, self.tokenizer.pad_token_id | |
| ) | |
| preds = np.where( | |
| predict_results.predictions != IGNORE_INDEX, predict_results.predictions, self.tokenizer.pad_token_id | |
| ) | |
| for i in range(len(preds)): | |
| pad_len = np.nonzero(preds[i] != self.tokenizer.pad_token_id)[0] | |
| if len(pad_len): | |
| preds[i] = np.concatenate( | |
| (preds[i][pad_len[0] :], preds[i][: pad_len[0]]), axis=-1 | |
| ) # move pad token to last | |
| decoded_labels = self.tokenizer.batch_decode( | |
| labels, skip_special_tokens=True, clean_up_tokenization_spaces=False | |
| ) | |
| decoded_preds = self.tokenizer.batch_decode(preds, skip_special_tokens=True, clean_up_tokenization_spaces=True) | |
| with open(output_prediction_file, "w", encoding="utf-8") as writer: | |
| res: List[str] = [] | |
| for label, pred in zip(decoded_labels, decoded_preds): | |
| res.append(json.dumps({"label": label, "predict": pred}, ensure_ascii=False)) | |
| writer.write("\n".join(res)) | |