#!/usr/bin/env python
# coding=utf-8
"""The Finetuner class simplifies the process of running finetuning process on a language model for a TunableModel instance with given dataset.
"""
import copy
import logging
import os
import sys
from typing import Union
import datasets
import evaluate
import transformers
from copy import deepcopy
from itertools import chain
from transformers import (
Trainer,
default_data_collator,
set_seed,
)
from transformers.trainer_utils import get_last_checkpoint
from transformers.utils import (
send_example_telemetry,
)
from lmflow.args import DatasetArguments, ModelArguments, FinetunerArguments
from lmflow.datasets.dataset import Dataset
from lmflow.models.hf_decoder_model import HFDecoderModel
# from lmflow.models.hf_encoder_decoder_model import HFEncoderDecoderModel
from lmflow.models.hf_text_regression_model import HFTextRegressionModel
from lmflow.optim import create_customized_optimizer
from lmflow.pipeline.base_tuner import BaseTuner
from lmflow.pipeline.utils.peft_trainer import PeftTrainer, PeftSavingCallback
from lmflow.pipeline.utils.lisa_trainer import DynamicLayerActivationCallback
from lmflow.utils.versioning import is_package_version_at_least
[docs]
logger = logging.getLogger(__name__)
[docs]
class Finetuner(BaseTuner):
"""
Initializes the `Finetuner` class with given arguments.
Parameters
------------
model_args : ModelArguments object.
Contains the arguments required to load the model.
data_args : DatasetArguments object.
Contains the arguments required to load the dataset.
finetuner_args : FinetunerArguments object.
Contains the arguments required to perform finetuning.
args : Optional.
Positional arguments.
kwargs : Optional.
Keyword arguments.
"""
def __init__(
self,
model_args: ModelArguments,
data_args: DatasetArguments,
finetuner_args: FinetunerArguments,
*args,
**kwargs
):
[docs]
self.model_args = model_args
[docs]
self.data_args = data_args
[docs]
self.finetuner_args = finetuner_args
# Sending telemetry. Tracking the example usage helps us better
# allocate resources to maintain them. The information sent is the one
# passed as arguments along with your Python/PyTorch versions.
send_example_telemetry("run_clm", model_args, data_args)
# Setup logging
logging.basicConfig(
format="%(asctime)s - %(levelname)s - %(name)s - %(message)s",
datefmt="%m/%d/%Y %H:%M:%S",
handlers=[logging.StreamHandler(sys.stdout)],
)
log_level = finetuner_args.get_process_log_level()
logger.setLevel(log_level)
datasets.utils.logging.set_verbosity(log_level)
transformers.utils.logging.set_verbosity(log_level)
transformers.utils.logging.enable_default_handler()
transformers.utils.logging.enable_explicit_format()
# Log on each process the small summary:
logger.warning(
f"Process rank: {finetuner_args.local_rank},"
f" device: {finetuner_args.device},"
f" n_gpu: {finetuner_args.n_gpu},"
f"distributed training: {bool(finetuner_args.local_rank != -1)},"
f" 16-bits training: {finetuner_args.fp16}"
)
logger.info(f"Training/evaluation parameters {finetuner_args}")
# Detecting last checkpoint.
last_checkpoint = None
if os.path.isdir(finetuner_args.output_dir) and finetuner_args.do_train and not finetuner_args.overwrite_output_dir:
last_checkpoint = get_last_checkpoint(finetuner_args.output_dir)
if last_checkpoint is None and len(os.listdir(finetuner_args.output_dir)) > 0:
raise ValueError(
f"Output directory ({finetuner_args.output_dir}) already"
" exists and is not empty. "
"Use --overwrite_output_dir to overcome."
)
elif last_checkpoint is not None and finetuner_args.resume_from_checkpoint is None:
logger.info(
f"Checkpoint detected, resuming training at"
f" {last_checkpoint}. To avoid this behavior, change"
" the `--output_dir` or add `--overwrite_output_dir` to"
" train from scratch."
)
[docs]
self.last_checkpoint = last_checkpoint
# Set seed before initializing model.
set_seed(finetuner_args.seed)
[docs]
def group_text(self, tokenized_datasets, model_max_length):
"""
Groups texts together to form blocks of maximum length `model_max_length` and returns the processed data as
a dictionary.
"""
data_args = self.data_args
finetuner_args = self.finetuner_args
if data_args.block_size is None:
block_size = model_max_length
if block_size > 1024:
logger.warning(
"The chosen tokenizer supports a `model_max_length` that is"
" longer than the default `block_size` value"
" of 1024. If you would like to use a longer `block_size`"
" up to `tokenizer.model_max_length` you can override this "
" default with `--block_size xxx`."
)
block_size = 1024
else:
if data_args.block_size > model_max_length:
if self.model_args.truncate_to_model_max_length:
logger.warning(
f"The block_size passed ({data_args.block_size}) is larger"
f" than the maximum length for the model"
f"({model_max_length})."
f" Using block_size={model_max_length}."
f"If you would like to use a longer 'block_size' that is"
f" longer than the maximum length supported by the model,"
f" you can override this behavior with"
f"default with `--truncate_to_model_max_length False`."
)
block_size = model_max_length
else:
logger.warning(
f"The block_size passed ({data_args.block_size}) is larger"
f"than the maximum length for the model"
f"({model_max_length})."
f"Using block_size={data_args.block_size}.")
block_size = data_args.block_size
else:
block_size = data_args.block_size
# Main data processing function that will concatenate all texts from
# our dataset and generate chunks of block_size.
def group_texts(examples):
# Concatenate all texts.
concatenated_examples = {k: list(chain(*examples[k])) for k in examples.keys()}
total_length = len(concatenated_examples[list(examples.keys())[0]])
# We drop the small remainder, we could add padding if the model
# supported it instead of this drop, you can customize this part to
# your needs.
total_length = (total_length // block_size) * block_size
# Split by chunks of max_len.
result = {
k: [t[i : i + block_size] for i in range(0, total_length, block_size)]
for k, t in concatenated_examples.items()
}
return result
# Note that with `batched=True`, this map processes 1,000 texts
# together, so group_texts throws away a remainder for each of those
# groups of 1,000 texts. You can adjust that batch_size here but a
# higher value might be slower to preprocess.
#
# To speed up this part, we use multiprocessing. See the documentation
# of the map method for more information:
# https://huggingface.co/docs/datasets/package_reference/main_classes.html#datasets.Dataset.map
with finetuner_args.main_process_first(desc="grouping texts together"):
group_batch_size = data_args.group_texts_batch_size
if data_args.disable_group_texts:
group_batch_size = 1
if not data_args.streaming:
lm_datasets = tokenized_datasets.map(
group_texts,
batched=True,
batch_size=group_batch_size,
num_proc=data_args.preprocessing_num_workers,
load_from_cache_file=not data_args.overwrite_cache,
desc=f"Grouping texts in chunks of {block_size}",
)
else:
lm_datasets = tokenized_datasets.map(
group_texts,
batched=True,
batch_size=group_batch_size,
)
return lm_datasets
[docs]
def tune(self,
model: Union[HFDecoderModel, HFTextRegressionModel],
dataset: Dataset,
transform_dataset_in_place=True,
data_collator=None):
"""
Perform tuning for a model
Parameters
------------
model : TunableModel object.
TunableModel to perform tuning.
dataset:
dataset to train model.
"""
model_args = self.model_args
data_args = self.data_args
finetuner_args = self.finetuner_args
if not transform_dataset_in_place:
dataset = copy.deepcopy(dataset)
# Tokenization and text grouping must be done in the main process
if dataset.backend == "custom_multi_modal":
dataset.backend_dataset.register_tokenizer(
model.tokenizer, model.image_processor)
lm_dataset = dataset
else:
with finetuner_args.main_process_first(desc="dataset map tokenization"):
tokenized_dataset = model.tokenize(dataset)
if data_args.disable_group_texts:
lm_dataset = tokenized_dataset
else:
lm_dataset = self.group_text(
tokenized_dataset,
model_max_length=model.get_max_length(),
)
train_dataset = lm_dataset.get_backend_dataset()
total_tokens = 0
total_target_tokens = 0
pad_token_id = model.get_tokenizer().pad_token_id
logger.warning("Calculating data stats...")
import time
start_time = time.time()
for datapoint in train_dataset:
total_tokens += len([label for label in datapoint["input_ids"] if label != pad_token_id])
total_target_tokens += len([label for label in datapoint["labels"] if label != -100])
logger.warning(
"Data stats:\n\n"
f"Total tokens: {total_tokens}\n"
f"Total target tokens: {total_target_tokens}\n"
f"Total samples: {len(train_dataset)}\n"
f"Average tokens per sample: {total_tokens / len(train_dataset)}\n"
f"Average target tokens per sample: {total_target_tokens / len(train_dataset)}\n"
)
logger.warning("Calculating data stats took %s seconds", time.time() - start_time)
if finetuner_args.do_eval:
eval_dataset_args = deepcopy(data_args)
eval_dataset_args.dataset_path = finetuner_args.eval_dataset_path
eval_dataset = Dataset(eval_dataset_args)
with finetuner_args.main_process_first(desc="dataset map tokenization"):
tokenized_dataset = model.tokenize(eval_dataset)
if data_args.disable_group_texts:
lm_dataset = tokenized_dataset
else:
lm_dataset = self.group_text(
tokenized_dataset,
model_max_length=model.get_max_length(),
)
eval_dataset = lm_dataset.get_backend_dataset()
logger.info(f"Number of eval samples: {len(eval_dataset)}")
def preprocess_logits_for_metrics(logits, labels):
if isinstance(logits, tuple):
# Depending on the model and config, logits may contain extra tensors,
# like past_key_values, but logits always come first
logits = logits[0]
return logits.argmax(dim=-1)
metric = evaluate.load("accuracy")
def compute_metrics(eval_preds):
preds, labels = eval_preds
# preds have the same shape as the labels, after the argmax(-1) has been calculated
# by preprocess_logits_for_metrics but we need to shift the labels
labels = labels[:, 1:].reshape(-1)
preds = preds[:, :-1].reshape(-1)
return metric.compute(predictions=preds, references=labels)
if finetuner_args.do_train:
if data_args.max_train_samples is not None:
max_train_samples = min(len(train_dataset), data_args.max_train_samples)
train_dataset = train_dataset.select(range(max_train_samples))
# Initialize our Trainer
training_args = finetuner_args
if model_args.use_lora:
FinetuningTrainer = PeftTrainer
trainer_callbacks = [PeftSavingCallback]
else:
FinetuningTrainer = Trainer
trainer_callbacks = []
if data_collator is None:
data_collator = default_data_collator
if training_args.use_customized_optim:
BaseTrainer = FinetuningTrainer
FinetuningTrainer = create_customized_optimizer(
BaseTrainer, model_args
)
if training_args.use_lisa:
dynamic_layer_activation_callback = DynamicLayerActivationCallback(
n_layers=training_args.lisa_activated_layers, # Number of layers to activate
interval_steps=training_args.lisa_interval_steps, # Step interval to update active layers
model=model.get_backend_model(),
lisa_layers_attribute=training_args.lisa_layers_attribute, # Attribute to access layers of the model
)
trainer_callbacks.append(dynamic_layer_activation_callback)
trainer_kwargs = {
"model": model.get_backend_model(),
"args": training_args,
"train_dataset": train_dataset if training_args.do_train else None,
"eval_dataset": eval_dataset if training_args.do_eval else None,
"data_collator": data_collator,
"compute_metrics": compute_metrics if training_args.do_eval else None,
"preprocess_logits_for_metrics": preprocess_logits_for_metrics if training_args.do_eval else None,
"callbacks": trainer_callbacks
}
if is_package_version_at_least('transformers', '4.46.0'):
# https://github.com/huggingface/transformers/pull/32385
trainer_kwargs["processing_class"] = model.get_tokenizer()
else:
trainer_kwargs["tokenizer"] = model.get_tokenizer()
trainer = FinetuningTrainer(**trainer_kwargs)
# Training
if training_args.do_train:
checkpoint = None
last_checkpoint = self.last_checkpoint
if training_args.resume_from_checkpoint is not None:
checkpoint = training_args.resume_from_checkpoint
elif last_checkpoint is not None:
checkpoint = last_checkpoint
train_result = trainer.train(resume_from_checkpoint=checkpoint)
if not model_args.use_lora:
trainer.save_model() # Saves the tokenizer too for easy upload
else:
if model_args.save_aggregated_lora:
model.merge_lora_weights()
model.save(finetuner_args.output_dir, model_args.save_aggregated_lora)
# save language_projection for multi-modal model;
if self.finetuner_args.save_language_projection:
language_projection_state = trainer.model.language_projection.state_dict()
torch.save(
osp.join(
self.finetuner_args.output_dir,
"language_projection.pth"),
language_projection_state)
metrics = train_result.metrics
max_train_samples = (
data_args.max_train_samples if data_args.max_train_samples is not None else len(train_dataset)
)
metrics["train_samples"] = min(max_train_samples, len(train_dataset))
trainer.log_metrics("train", metrics)
trainer.save_metrics("train", metrics)
trainer.save_state()
kwargs = {"finetuned_from": model_args.model_name_or_path, "tasks": "text-generation"}
if data_args.dataset_name is not None:
kwargs["dataset_tags"] = data_args.dataset_name
if data_args.dataset_config_name is not None:
kwargs["dataset_args"] = data_args.dataset_config_name
kwargs["dataset"] = f"{data_args.dataset_name} {data_args.dataset_config_name}"
else:
kwargs["dataset"] = data_args.dataset_name
if training_args.push_to_hub:
trainer.push_to_hub(**kwargs)
else:
trainer.create_model_card(**kwargs)
return model
