rename package

Former-commit-id: a07ff0c083558cfe6f474d13027642d3052fee08

src/llamafactory/train/orpo/__init__.py

@@ -0,0 +1,4 @@
+from .workflow import run_orpo
+
+
+__all__ = ["run_orpo"]

src/llamafactory/train/orpo/trainer.py

@@ -0,0 +1,135 @@
+from collections import defaultdict
+from types import MethodType
+from typing import TYPE_CHECKING, Dict, Literal, Optional, Tuple, Union
+
+import torch
+import torch.nn.functional as F
+from transformers import Trainer
+from trl import DPOTrainer
+from trl.trainer.utils import disable_dropout_in_model
+
+from ...extras.constants import IGNORE_INDEX
+from ..utils import create_custom_optimzer, create_custom_scheduler
+
+
+if TYPE_CHECKING:
+    from transformers import PreTrainedModel, ProcessorMixin
+
+    from ...hparams import FinetuningArguments
+
+
+class CustomORPOTrainer(DPOTrainer):
+    def __init__(
+        self,
+        model: Union["PreTrainedModel", "torch.nn.Module"],
+        finetuning_args: "FinetuningArguments",
+        processor: Optional["ProcessorMixin"],
+        disable_dropout: bool = True,
+        **kwargs,
+    ):
+        if disable_dropout:
+            disable_dropout_in_model(model)
+
+        self.finetuning_args = finetuning_args
+        self.processor = processor
+        self.reference_free = False
+        self.use_dpo_data_collator = True  # hack to avoid warning
+        self.generate_during_eval = False  # disable at evaluation
+        self.label_pad_token_id = IGNORE_INDEX
+        self.padding_value = 0
+        self.is_encoder_decoder = model.config.is_encoder_decoder
+        self.precompute_ref_log_probs = False
+        self._precomputed_train_ref_log_probs = False
+        self._precomputed_eval_ref_log_probs = False
+        self._peft_has_been_casted_to_bf16 = False
+
+        self.beta = finetuning_args.orpo_beta
+        self._stored_metrics = defaultdict(lambda: defaultdict(list))
+
+        Trainer.__init__(self, model=model, **kwargs)
+        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 odds_ratio_loss(self, chosen_logps: "torch.Tensor", rejected_logps: "torch.Tensor") -> "torch.Tensor":
+        r"""
+        Computes ORPO's odds ratio (OR) loss.
+        """
+        log_odds = (chosen_logps - rejected_logps) - (
+            torch.log1p(-torch.exp(chosen_logps)) - torch.log1p(-torch.exp(rejected_logps))
+        )
+        odds_ratio_loss = -F.logsigmoid(log_odds)
+        return odds_ratio_loss
+
+    def concatenated_forward(
+        self, model: "PreTrainedModel", batch: Dict[str, "torch.Tensor"]
+    ) -> Tuple["torch.Tensor", "torch.Tensor", "torch.Tensor", "torch.Tensor"]:
+        r"""
+        Computes the average log probabilities of the labels under the given logits.
+        """
+        all_logits: "torch.Tensor" = model(
+            input_ids=batch["input_ids"], attention_mask=batch["attention_mask"], return_dict=True, use_cache=False
+        ).logits.to(torch.float32)
+
+        all_logps = self.get_batch_logps(
+            logits=all_logits,
+            labels=batch["labels"],
+            average_log_prob=True,
+            is_encoder_decoder=self.is_encoder_decoder,
+            label_pad_token_id=self.label_pad_token_id,
+        )
+        batch_size = batch["input_ids"].size(0) // 2
+        chosen_logps, rejected_logps = all_logps.split(batch_size, dim=0)
+        chosen_logits, rejected_logits = all_logits.split(batch_size, dim=0)
+        return chosen_logps, rejected_logps, chosen_logits, rejected_logits
+
+    def get_batch_loss_metrics(
+        self,
+        model: "PreTrainedModel",
+        batch: Dict[str, "torch.Tensor"],
+        train_eval: Literal["train", "eval"] = "train",
+    ) -> Tuple["torch.Tensor", Dict[str, "torch.Tensor"]]:
+        r"""
+        Computes the ORPO loss and other metrics for the given batch of inputs for train or test.
+        """
+        metrics = {}
+        chosen_logps, rejected_logps, chosen_logits, rejected_logits = self.concatenated_forward(model, batch)
+        sft_loss = -chosen_logps
+        odds_ratio_loss = self.odds_ratio_loss(chosen_logps, rejected_logps)
+        batch_loss = (sft_loss + self.beta * odds_ratio_loss).mean()
+
+        chosen_rewards = self.beta * chosen_logps.detach()
+        rejected_rewards = self.beta * rejected_logps.detach()
+        reward_accuracies = (chosen_rewards > rejected_rewards).float()
+
+        prefix = "eval_" if train_eval == "eval" else ""
+        metrics["{}rewards/chosen".format(prefix)] = chosen_rewards.mean().cpu()
+        metrics["{}rewards/rejected".format(prefix)] = rejected_rewards.mean().cpu()
+        metrics["{}rewards/accuracies".format(prefix)] = reward_accuracies.mean().cpu()
+        metrics["{}rewards/margins".format(prefix)] = (chosen_rewards - rejected_rewards).mean().cpu()
+        metrics["{}logps/rejected".format(prefix)] = rejected_logps.detach().mean().cpu()
+        metrics["{}logps/chosen".format(prefix)] = chosen_logps.detach().mean().cpu()
+        metrics["{}logits/rejected".format(prefix)] = rejected_logits.detach().mean().cpu()
+        metrics["{}logits/chosen".format(prefix)] = chosen_logits.detach().mean().cpu()
+        metrics["{}sft_loss".format(prefix)] = sft_loss.detach().mean().cpu()
+        metrics["{}odds_ratio_loss".format(prefix)] = odds_ratio_loss.detach().mean().cpu()
+
+        return batch_loss, metrics

src/llamafactory/train/orpo/workflow.py

@@ -0,0 +1,69 @@
+# Inspired by: https://github.com/huggingface/trl/blob/main/examples/research_projects/stack_llama_2/scripts/dpo_llama2.py
+
+from typing import TYPE_CHECKING, List, Optional
+
+from ...data import PairwiseDataCollatorWithPadding, get_dataset, split_dataset
+from ...extras.constants import IGNORE_INDEX
+from ...extras.ploting import plot_loss
+from ...hparams import ModelArguments
+from ...model import load_model, load_tokenizer
+from ..utils import create_modelcard_and_push
+from .trainer import CustomORPOTrainer
+
+
+if TYPE_CHECKING:
+    from transformers import Seq2SeqTrainingArguments, TrainerCallback
+
+    from ...hparams import DataArguments, FinetuningArguments
+
+
+def run_orpo(
+    model_args: "ModelArguments",
+    data_args: "DataArguments",
+    training_args: "Seq2SeqTrainingArguments",
+    finetuning_args: "FinetuningArguments",
+    callbacks: Optional[List["TrainerCallback"]] = None,
+):
+    tokenizer_module = load_tokenizer(model_args)
+    tokenizer = tokenizer_module["tokenizer"]
+    dataset = get_dataset(model_args, data_args, training_args, stage="rm", **tokenizer_module)
+    model = load_model(tokenizer, model_args, finetuning_args, training_args.do_train)
+
+    data_collator = PairwiseDataCollatorWithPadding(
+        tokenizer=tokenizer,
+        pad_to_multiple_of=8,
+        label_pad_token_id=IGNORE_INDEX if data_args.ignore_pad_token_for_loss else tokenizer.pad_token_id,
+    )
+
+    # Update arguments
+    training_args.remove_unused_columns = False  # important for pairwise dataset
+
+    # Initialize our Trainer
+    trainer = CustomORPOTrainer(
+        model=model,
+        args=training_args,
+        finetuning_args=finetuning_args,
+        data_collator=data_collator,
+        callbacks=callbacks,
+        **tokenizer_module,
+        **split_dataset(dataset, data_args, training_args),
+    )
+
+    # Training
+    if training_args.do_train:
+        train_result = trainer.train(resume_from_checkpoint=training_args.resume_from_checkpoint)
+        trainer.save_model()
+        trainer.log_metrics("train", train_result.metrics)
+        trainer.save_metrics("train", train_result.metrics)
+        trainer.save_state()
+        if trainer.is_world_process_zero() and finetuning_args.plot_loss:
+            plot_loss(training_args.output_dir, keys=["loss", "eval_loss", "rewards/accuracies", "sft_loss"])
+
+    # Evaluation
+    if training_args.do_eval:
+        metrics = trainer.evaluate(metric_key_prefix="eval")
+        trainer.log_metrics("eval", metrics)
+        trainer.save_metrics("eval", metrics)
+
+    # Create model card
+    create_modelcard_and_push(trainer, model_args, data_args, training_args, finetuning_args)