/
conv_dataset.py
336 lines (261 loc) · 11.3 KB
/
conv_dataset.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
"""Dataset for sequence-to-sequence response generation."""
from dataclasses import dataclass
from typing import Any, Dict, List, Tuple
import datasets
import torch
from torch.utils.data import Dataset
from transformers import PreTrainedTokenizer
from chatllms.data.data_utils import IGNORE_INDEX, make_data_module
from chatllms.data.sft_dataset import DataCollatorForSupervisedDataset
@dataclass
class VicunaDataset(Dataset):
"""Dataset for multi-turn conversations using a Transformer model.
Attributes:
raw_data: The preprocessed dataset dict to load
tokenizer: Pretrained tokenizer to encode text
max_seq_length: Maximum sequence length for model inputs
"""
def __init__(
self,
raw_data: datasets.DatasetDict,
tokenizer: PreTrainedTokenizer,
max_seq_length: int = 1024,
):
"""Initialize the dataset with conversations, tokenizer, and max
sequence length.
Args:
raw_data: The preprocessed dataset dict to load
tokenizer: Pretrained tokenizer to encode text
max_seq_length: Maximum sequence length for model inputs
"""
self.raw_data = raw_data
self.tokenizer = tokenizer
self.max_seq_length = max_seq_length
# Mapping from speaker to role
self.roles = {'human': 'USER', 'gpt': 'ASSISTANT'}
# Description of the conversation
self.system = "A chat between a curious user and an artificial intelligence assistant. The assistant gives helpful, detailed, and polite answers to the user's questions."
# Token to use at the start of each turn
self.start_token = '\n'
def tokenize_conversation(
self,
conversation: List[Dict]) -> Tuple[torch.Tensor, torch.Tensor]:
"""Tokenize a single conversation into input IDs and labels.
Args:
conversation: List of turns in the conversation
Returns:
input_ids: Tensor of input IDs
labels: Tensor of word IDs for language modeling
"""
# Arrays to store token IDs for input and labels
input_ids = []
labels = []
# Track speaker roles
roles = ['USER', 'ASSISTANT']
# Tokenize each turn in the conversation
for i, turn in enumerate(conversation):
role = self.roles[turn['from']]
assert role == roles[i % 2], f'{i}'
# Get turn text
text = turn['value']
# For human turn, tokenize prompt
if i % 2 == 0:
prefix = self._get_human_prefix(i, role)
prompt = prefix + text + self.tokenizer.eos_token
tokenized = self.tokenizer(prompt, add_special_tokens=False)
input_ids += tokenized['input_ids']
labels += [IGNORE_INDEX] * len(tokenized['input_ids'])
# For assistant turn, tokenize response
else:
prefix = self.start_token + role + ': '
tokenized_prefix = self.tokenizer(prefix,
add_special_tokens=False)
input_ids += tokenized_prefix['input_ids']
labels += [IGNORE_INDEX] * len(tokenized_prefix['input_ids'])
response = text + self.tokenizer.eos_token
tokenized_response = self.tokenizer(response,
add_special_tokens=False)
input_ids += tokenized_response['input_ids']
labels += tokenized_response['input_ids']
assert len(input_ids) == len(
labels), f'{len(input_ids)} != {len(labels)}'
return torch.tensor(input_ids), torch.tensor(labels)
def _get_human_prefix(self, turn_id: int, role: str) -> str:
"""Get the prefix for a human turn.
Args:
turn_id: Index of the current turn
role: Current speaker role
Returns:
prefix: Prefix string including special tokens
"""
if turn_id == 0:
prefix = self.tokenizer.bos_token + self.system + role + ': '
else:
prefix = self.start_token + role + ': '
return prefix
def __len__(self) -> int:
"""Get the number of conversations."""
return len(self.raw_data)
def __getitem__(self, index: int) -> Dict:
"""Get the input IDs and labels for a specific conversation.
Args:
index: Index of the conversation
Returns:
Dictionary with input IDs and labels
"""
conversation = self.raw_data[index]['conversations']
input_ids, labels = self.tokenize_conversation(conversation)
# Truncate sequence lengths
input_ids = input_ids[:self.max_seq_length]
labels = labels[:self.max_seq_length]
return {'input_ids': input_ids, 'labels': labels}
@dataclass
class ConversationDataset(Dataset):
"""Dataset for multi-turn conversations using Transformer model.
Attributes:
raw_data: The preprocessed dataset dict to load
tokenizer: Pretrained tokenizer
max_seq_length: Maximum length of sequence
"""
def __init__(
self,
raw_data: datasets.DatasetDict,
tokenizer: PreTrainedTokenizer,
max_seq_length: int = 1024,
):
"""Initialize the dataset with conversations, tokenizer and max
sequence length."""
self.raw_data = raw_data
self.tokenizer = tokenizer
self.max_seq_length = max_seq_length
self.roles = ['human', 'gpt']
def tokenize_conversation(
self,
conversation: List[Dict],
) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
"""Tokenize a single conversation into input IDs and labels.
Args:
conversation: List of turns in the conversation
Returns:
input_ids: Tensor of input IDs
labels: Tensor of word IDs for language modeling
"""
context = []
for i, turn in enumerate(conversation):
role = turn['from']
assert role == self.roles[i % 2]
context.append(turn['value'])
encoded = self.tokenizer(context, add_special_tokens=False)
input_ids = [self.tokenizer.bos_token_id]
target_mask = [0]
labels = [IGNORE_INDEX]
for i, ids in enumerate(encoded.input_ids):
input_ids += ids + [self.tokenizer.eos_token_id]
if i % 2 == 0: # Human turn
target_mask += [0] * (len(ids) + 1)
labels += [IGNORE_INDEX] * (len(ids) + 1)
else: # Assistant turn
target_mask += [1] * (len(ids) + 1)
labels += ids + [self.tokenizer.eos_token_id]
assert len(input_ids) == len(target_mask) == len(labels)
return (torch.tensor(input_ids, dtype=torch.long),
torch.tensor(target_mask, dtype=torch.long),
torch.tensor(labels, dtype=torch.long))
def __len__(self) -> int:
return len(self.raw_data)
def __getitem__(self, index: int) -> Dict[str, torch.Tensor]:
"""Get the input IDs and labels for a specific conversation.
Args:
index: Index of the conversation
Returns:
Dictionary with input IDs and labels
"""
conversation = self.raw_data[index]['conversations']
input_ids, target_mask, labels = self.tokenize_conversation(
conversation)
# Truncate sequence
input_ids = input_ids[:self.max_seq_length]
target_mask = target_mask[:self.max_seq_length]
labels = labels[:self.max_seq_length]
attention_mask = torch.ones_like(input_ids)
return {
'input_ids': input_ids,
'attention_mask': attention_mask,
'labels': labels,
'target_mask': target_mask
}
@dataclass
class ConversationDataCollator(object):
"""Collate and pad a batch of conversation examples to prepare for
training."""
def __init__(
self,
tokenizer: PreTrainedTokenizer,
max_seq_length: int = 1024,
):
self.tokenizer = tokenizer
self.max_seq_length = max_seq_length
self.pad_token_id = tokenizer.pad_token_id
def __call__(self, batch: List[Dict[str, Any]]) -> Dict[str, torch.Tensor]:
lengths = [len(ex['input_ids']) for ex in batch]
max_length = min(max(lengths), self.max_seq_length)
batch_input_ids = []
batch_att_masks = []
batch_target_masks = []
for ex in batch:
input_ids = ex['input_ids']
attention_mask = ex['attention_mask']
target_mask = ex['target_mask']
padding_length = max_length - len(input_ids)
input_ids = input_ids + [self.pad_token_id] * padding_length
attention_mask = attention_mask + [0] * padding_length
target_mask = target_mask + [0] * padding_length
input_ids = input_ids[:self.max_seq_length]
attention_mask = attention_mask[:self.max_seq_length]
target_mask = target_mask[:self.max_seq_length]
batch_input_ids.append(input_ids)
batch_att_masks.append(attention_mask)
batch_target_masks.append(target_mask)
batch_input_ids = torch.tensor(batch_input_ids, dtype=torch.long)
batch_att_masks = torch.tensor(batch_att_masks, dtype=torch.long)
batch_target_masks = torch.tensor(batch_target_masks, dtype=torch.long)
return {
'input_ids': batch_input_ids,
'attention_mask': batch_att_masks,
'target_mask': batch_target_masks
}
def make_conversation_data_module(tokenizer: PreTrainedTokenizer,
args) -> Dict[str, Dataset]:
"""Create dataset and collator for conversation modeling.
Args:
tokenizer (PreTrainedTokenizer): The tokenizer object.
use_vicuna_prompt (bool): Flag indicating whether to use vicuna_prompt.
data_path (str): The path to the data file or directory.
Returns:
dict: A dictionary containing the train_dataset and eval_dataset.
"""
# Determine the appropriate dataset class based on dataset_type flag
dataset_cls = (VicunaDataset if args.conversation_template == 'vicuna' else
ConversationDataset)
train_raw_data, eval_raw_data = make_data_module(args)
# Create train and eval datasets using the chosen dataset class
max_seq_length = tokenizer.model_max_length
train_dataset = dataset_cls(train_raw_data,
tokenizer=tokenizer,
max_seq_length=max_seq_length)
eval_dataset = dataset_cls(eval_raw_data,
tokenizer=tokenizer,
max_seq_length=max_seq_length)
print('train_dataset: ', train_dataset, type(train_dataset), '#length: ',
len(train_dataset))
print('eval_dataset: ', eval_dataset, type(eval_dataset), '#length: ',
len(eval_dataset))
# Create data collator
print('Adding data collator: ', DataCollatorForSupervisedDataset)
data_collator = DataCollatorForSupervisedDataset(tokenizer=tokenizer)
print('data_collator: ', type(data_collator))
return {
'train_dataset': train_dataset,
'eval_dataset': eval_dataset,
'data_collator': data_collator
}