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"""Module containing Dataset functionality"""
import logging
import os
from typing import List
import torch
from datasets import Dataset, IterableDataset
from .prompt_tokenizers import PromptTokenizingStrategy
# We want this to be a wrapper for an existing dataset that we have loaded
# lets use the concept of middlewares to wrap each dataset, for example
# ConstantLengthDataset(ShuffledDataset([TokenizedPromptDataset(alpaca_dataset)]))
# let's check to ensure we don't truncate an item in the middle, we'll use
# the collators later on to pad the datasets
LOG = logging.getLogger("axolotl")
class TokenizedPromptDataset(Dataset):
"""
Dataset that returns tokenized prompts from a stream of text files.
Args:
prompt_tokenizer (PromptTokenizingStrategy): The prompt tokenizing method for proccessing the data.
dataset (dataset.Dataset): Dataset with text files.
"""
def __init__( # pylint: disable=super-init-not-called
self,
prompt_tokenizer: PromptTokenizingStrategy,
dataset: IterableDataset,
**kwargs,
):
self.prompt_tokenizer = prompt_tokenizer
super().__init__(self.process(dataset).data, **kwargs)
def process(self, dataset):
features = dataset.features.keys()
num_proc = min(64, os.cpu_count())
return dataset.map(
self.prompt_tokenizer.tokenize_prompt,
num_proc=num_proc,
remove_columns=features,
)
# TODO this isn't the best since it can't interleave datasets
class ConstantLengthDataset(IterableDataset):
"""
Iterable dataset that returns constant length chunks of tokens from stream of text files.
Args:
tokenizer (Tokenizer): The processor used for proccessing the data.
dataset (dataset.Dataset): Dataset with text files.
seq_length (int): Length of token sequences to return.
"""
def __init__( # pylint: disable=super-init-not-called
self,
tokenizer,
datasets,
seq_length=2048,
):
self.tokenizer = tokenizer
self.concat_token_id = tokenizer.eos_token_id
self.datasets: List[IterableDataset] = datasets
self.seq_length = seq_length
vocab_size = len(tokenizer.get_vocab())
if vocab_size <= torch.iinfo(torch.int16).max:
self.tokens_dtype = torch.int16
elif vocab_size <= torch.iinfo(torch.int32).max:
self.tokens_dtype = torch.int32
else:
self.tokens_dtype = torch.int64
def __iter__(self):
buffer = {
"input_ids": [],
"attention_mask": [],
"labels": [],
"position_ids": [],
}
buffer_len = 0
for dataset in self.datasets:
idx = 0
iterator = iter(dataset)
more_examples = True
while more_examples:
try:
example = next(iterator)
idx += 1
except StopIteration:
more_examples = False
example = None
add_concat_token = False
if example:
example_len = len(example["input_ids"])
add_concat_token = example["input_ids"][-1] != self.concat_token_id
else:
example_len = 0
if not example_len or (
buffer_len + int(add_concat_token) + example_len > self.seq_length
):
if buffer["input_ids"]:
input_ids = torch.cat(buffer["input_ids"], dim=-1)[
: self.seq_length
]
attention_mask = torch.cat(buffer["attention_mask"], dim=-1)[
: self.seq_length
]
position_ids = torch.cat(buffer["position_ids"], dim=-1)[
: self.seq_length
]
labels = torch.cat(buffer["labels"], dim=-1)[: self.seq_length]
if labels.size() == input_ids.size() and (
attention_mask.size() == input_ids.size()
):
yield {
"input_ids": input_ids,
"labels": labels,
"attention_mask": attention_mask,
"position_ids": position_ids,
}
else:
LOG.warning(
f"dropping batch due to tensor size mismatch input_ids: {input_ids.size()}, labels: {labels.size()}, attention_mask: {attention_mask.size()}"
)
buffer = {
"input_ids": [],
"attention_mask": [],
"labels": [],
"position_ids": [],
}
buffer_len = 0
idx = 1
if example:
# FIXME
# just going to drop data points that are too long
if len(example["input_ids"]) <= self.seq_length:
input_ids = example["input_ids"]
attention_mask = example["attention_mask"]
labels = example["labels"]
if add_concat_token:
input_ids.append(self.concat_token_id)
attention_mask.append(1)
labels.append(self.concat_token_id)
input_ids_with_concat = torch.tensor(
input_ids, dtype=self.tokens_dtype
)
attention_mask_with_concat = torch.tensor(
[idx * m for m in attention_mask], dtype=torch.int16
)
labels_with_concat = torch.tensor(
labels, dtype=self.tokens_dtype
)
position_ids = torch.arange(
len(input_ids), dtype=self.tokens_dtype
)
buffer["input_ids"].append(input_ids_with_concat)
buffer["attention_mask"].append(attention_mask_with_concat)
buffer["labels"].append(labels_with_concat)
buffer["position_ids"].append(position_ids)
buffer_len += len(input_ids)
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