import copy
from dataclasses import dataclass
import json
from typing import Dict, Sequence
import transformers
import torch
from torch.utils.data import Dataset
from PIL import Image, ImageFile
from tinychart.arguments import *
from tinychart.utils import *
from tinychart.data.process import *
from tinychart.constants import *
ImageFile.LOAD_TRUNCATED_IMAGES = True
class LazySupervisedDataset(Dataset):
"""Dataset for supervised fine-tuning."""
def __init__(self, data_path: str,
tokenizer: transformers.PreTrainedTokenizer,
data_args: DataArguments):
super(LazySupervisedDataset, self).__init__()
list_data_dict = json.load(open(data_path, "r"))
rank0_print("Formatting inputs...Skip in lazy mode")
self.tokenizer = tokenizer
self.list_data_dict = list_data_dict
self.data_args = data_args
def __len__(self):
return len(self.list_data_dict)
@property
def lengths(self):
length_list = []
for sample in self.list_data_dict:
img_tokens = 128 if 'image' in sample else 0
length_list.append(sum(len(conv['value'].split()) for conv in sample['conversations']) + img_tokens)
return length_list
@property
def modality_lengths(self):
length_list = []
for sample in self.list_data_dict:
cur_len = sum(len(conv['value'].split()) for conv in sample['conversations'])
cur_len = cur_len if 'image' in sample else -cur_len
length_list.append(cur_len)
return length_list
def __getitem__(self, i) -> Dict[str, torch.Tensor]:
sources = self.list_data_dict[i]
if isinstance(i, int):
sources = [sources]
assert len(sources) == 1, "Don't know why it is wrapped to a list" # FIXME
if 'image' in sources[0]:
image_file = self.list_data_dict[i]['image']
image_folder = self.data_args.image_folder
processor = self.data_args.image_processor
image = Image.open(os.path.join(image_folder, image_file)).convert('RGB')
if self.data_args.image_aspect_ratio == 'pad':
def expand2square(pil_img, background_color):
width, height = pil_img.size
if width == height:
return pil_img
elif width > height:
result = Image.new(pil_img.mode, (width, width), background_color)
result.paste(pil_img, (0, (width - height) // 2))
return result
else:
result = Image.new(pil_img.mode, (height, height), background_color)
result.paste(pil_img, ((height - width) // 2, 0))
return result
image = expand2square(image, tuple(int(x * 255) for x in processor.image_mean))
image = processor.preprocess(image, return_tensors='pt')['pixel_values'][0]
else:
image = processor.preprocess(image, return_tensors='pt')['pixel_values'][0]
sources = preprocess_multimodal(
copy.deepcopy([e["conversations"] for e in sources]),
self.data_args)
else:
sources = copy.deepcopy([e["conversations"] for e in sources])
data_dict = preprocess(
sources,
self.tokenizer,
has_image=('image' in self.list_data_dict[i]))
if isinstance(i, int):
data_dict = dict(input_ids=data_dict["input_ids"][0],
labels=data_dict["labels"][0])
# image exist in the data
if 'image' in self.list_data_dict[i]:
data_dict['image'] = image
elif self.data_args.is_multimodal:
# image does not exist in the data, but the model is multimodal
crop_size = self.data_args.image_processor.crop_size
data_dict['image'] = torch.zeros(3, crop_size['height'], crop_size['width'])
return data_dict
@dataclass
class DataCollatorForSupervisedDataset(object):
"""Collate examples for supervised fine-tuning."""
tokenizer: transformers.PreTrainedTokenizer
def __call__(self, instances: Sequence[Dict]) -> Dict[str, torch.Tensor]:
input_ids, labels = tuple([instance[key] for instance in instances]
for key in ("input_ids", "labels"))
if self.tokenizer.pad_token_id == self.tokenizer.eos_token_id:
for input_id in input_ids:
input_id[input_id == self.tokenizer.eos_token_id] = -300
input_ids = torch.nn.utils.rnn.pad_sequence(
input_ids,
batch_first=True,
padding_value=self.tokenizer.pad_token_id)
labels = torch.nn.utils.rnn.pad_sequence(labels,
batch_first=True,
padding_value=IGNORE_INDEX)
input_ids = input_ids[:, :self.tokenizer.model_max_length]
attention_mask = input_ids.ne(self.tokenizer.pad_token_id)
labels = labels[:, :self.tokenizer.model_max_length]
# FIXME: This is a hack for handling phi and stablelm, as they have the same eos, pad and unk. We want the model
# FIXME: to predict the eos in the input ids, but we also use the id of eos to pad sequence, so we use a temp
# FIXME: eos id first, and convert them back.
if self.tokenizer.pad_token_id == self.tokenizer.eos_token_id:
for input_id in input_ids:
input_id[input_id == -300] = self.tokenizer.eos_token_id
batch = dict(
input_ids=input_ids,
labels=labels,
attention_mask=attention_mask,
)
if 'image' in instances[0]:
images = [instance['image'] for instance in instances]
if all(x is not None and x.shape == images[0].shape for x in images):
batch['images'] = torch.stack(images)
else:
batch['images'] = images
if 'question' in instances[0]:
questions = [instance['question'] for instance in instances]
batch['questions'] = questions
if 'answer' in instances[0]:
answers = [instance['answer'] for instance in instances]
batch['answers'] = answers
return batch
def make_supervised_data_module(tokenizer: transformers.PreTrainedTokenizer,
data_args) -> Dict:
"""Make dataset and collator for supervised fine-tuning."""
train_dataset = LazySupervisedDataset(tokenizer=tokenizer,
data_path=data_args.data_path,
data_args=data_args)
data_collator = DataCollatorForSupervisedDataset(tokenizer=tokenizer)
return dict(train_dataset=train_dataset,
eval_dataset=None,
data_collator=data_collator)
def make_supervised_data_module_with_eval(tokenizer: transformers.PreTrainedTokenizer,
data_args) -> Dict:
"""Make dataset and collator for supervised fine-tuning."""
train_dataset = LazySupervisedDataset(tokenizer=tokenizer,
data_path=data_args.data_path,
data_args=data_args)
if data_args.eval_data_path is None or data_args.eval_data_path == "":
print('Evaluation dataset not specified, skipping...')
eval_dataset = None
else:
eval_dataset = LazySupervisedDataset(tokenizer=tokenizer,
data_path=data_args.eval_data_path,
data_args=data_args)
data_collator = DataCollatorForSupervisedDataset(tokenizer=tokenizer)
return dict(train_dataset=train_dataset,
eval_dataset=eval_dataset,
data_collator=data_collator)