rename package

src/llamafactory/train/sft/trainer.py

@@ -0,0 +1,132 @@
+import json
+import os
+from types import MethodType
+from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple, Union
+
+import numpy as np
+import torch
+from transformers import Seq2SeqTrainer
+
+from ...extras.constants import IGNORE_INDEX
+from ...extras.logging import get_logger
+from ..utils import create_custom_optimzer, create_custom_scheduler
+
+
+if TYPE_CHECKING:
+    from transformers import ProcessorMixin
+    from transformers.trainer import PredictionOutput
+
+    from ...hparams import FinetuningArguments
+
+
+logger = get_logger(__name__)
+
+
+class CustomSeq2SeqTrainer(Seq2SeqTrainer):
+    r"""
+    Inherits Seq2SeqTrainer to compute generative metrics such as BLEU and ROUGE.
+    """
+
+    def __init__(
+        self, finetuning_args: "FinetuningArguments", processor: Optional["ProcessorMixin"], **kwargs
+    ) -> None:
+        super().__init__(**kwargs)
+        self.finetuning_args = finetuning_args
+        self.processor = processor
+        if finetuning_args.use_badam:
+            from badam import clip_grad_norm_for_sparse_tensor
+
+            self.accelerator.clip_grad_norm_ = MethodType(clip_grad_norm_for_sparse_tensor, self.accelerator)
+
+    def create_optimizer(self) -> "torch.optim.Optimizer":
+        if self.optimizer is None:
+            self.optimizer = create_custom_optimzer(self.model, self.args, self.finetuning_args)
+        return super().create_optimizer()
+
+    def create_scheduler(
+        self, num_training_steps: int, optimizer: Optional["torch.optim.Optimizer"] = None
+    ) -> "torch.optim.lr_scheduler.LRScheduler":
+        create_custom_scheduler(self.args, num_training_steps, optimizer)
+        return super().create_scheduler(num_training_steps, optimizer)
+
+    def _save(self, output_dir: Optional[str] = None, state_dict: Optional[Dict[str, "torch.Tensor"]] = None) -> None:
+        super()._save(output_dir, state_dict)
+        if self.processor is not None:
+            output_dir = output_dir if output_dir is not None else self.args.output_dir
+            getattr(self.processor, "image_processor").save_pretrained(output_dir)
+
+    def prediction_step(
+        self,
+        model: "torch.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))