modity code structure

Former-commit-id: 0682ed357210897e0b67c4a6eb31a94b3eb929f1

src/llmtuner/tuner/rm/workflow.py

@@ -0,0 +1,66 @@
+# Inspired by:
+# https://github.com/lvwerra/trl/blob/main/examples/summarization/scripts/reward_summarization.py
+# https://github.com/CarperAI/trlx/blob/main/examples/summarize_rlhf/reward_model/train_reward_model_gptj.py
+
+from transformers import Seq2SeqTrainingArguments
+
+from llmtuner.dsets import get_dataset, preprocess_dataset
+from llmtuner.extras.callbacks import LogCallback
+from llmtuner.extras.ploting import plot_loss
+from llmtuner.hparams import ModelArguments, DataArguments, FinetuningArguments
+from llmtuner.tuner.core import load_model_and_tokenizer
+from llmtuner.tuner.rm.metric import compute_accuracy
+from llmtuner.tuner.rm.collator import PairwiseDataCollatorWithPadding
+from llmtuner.tuner.rm.trainer import PairwisePeftTrainer
+
+
+def run_rm(
+    model_args: ModelArguments,
+    data_args: DataArguments,
+    training_args: Seq2SeqTrainingArguments,
+    finetuning_args: FinetuningArguments
+):
+    dataset = get_dataset(model_args, data_args)
+    model, tokenizer = load_model_and_tokenizer(model_args, finetuning_args, training_args.do_train, stage="rm")
+    dataset = preprocess_dataset(dataset, tokenizer, data_args, training_args, stage="rm")
+    data_collator = PairwiseDataCollatorWithPadding(tokenizer)
+
+    training_args.remove_unused_columns = False # important for pairwise dataset
+
+    # Split the dataset
+    if training_args.do_train:
+        if data_args.dev_ratio > 1e-6:
+            dataset = dataset.train_test_split(test_size=data_args.dev_ratio)
+            trainer_kwargs = {"train_dataset": dataset["train"], "eval_dataset": dataset["test"]}
+        else:
+            trainer_kwargs = {"train_dataset": dataset}
+    else: # do_eval or do_predict
+        trainer_kwargs = {"eval_dataset": dataset}
+
+    # Initialize our Trainer
+    trainer = PairwisePeftTrainer(
+        finetuning_args=finetuning_args,
+        model=model,
+        args=training_args,
+        tokenizer=tokenizer,
+        data_collator=data_collator,
+        callbacks=[LogCallback()],
+        compute_metrics=compute_accuracy,
+        **trainer_kwargs
+    )
+
+    # Training
+    if training_args.do_train:
+        train_result = trainer.train()
+        trainer.log_metrics("train", train_result.metrics)
+        trainer.save_metrics("train", train_result.metrics)
+        trainer.save_state()
+        trainer.save_model()
+        if trainer.is_world_process_zero() and model_args.plot_loss:
+            plot_loss(training_args.output_dir, keys=["loss", "eval_loss"])
+
+    # Evaluation
+    if training_args.do_eval:
+        metrics = trainer.evaluate(metric_key_prefix="eval")
+        trainer.log_metrics("eval", metrics)
+        trainer.save_metrics("eval", metrics)