302 lines
11 KiB
Python
302 lines
11 KiB
Python
import torch
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import bisect
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import pickle as pkl
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from abc import ABC, abstractmethod
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from torch import Tensor
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from torch.utils.data import Dataset, Sampler
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from typing import Callable, List, Dict, Literal, Union
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MutiSeg = Dict[str, List[Tensor]]
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Seg = Dict[str, Tensor]
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def load_pkl_files(paths: List[str]):
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segments: MutiSeg = {}
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total_samples = 0
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for path in paths:
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with open(path, "rb") as f:
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pkl_file: Seg = pkl.load(f)
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for key, value in pkl_file.items():
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if key not in segments:
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segments[key] = []
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segments[key].append(value)
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first_key = list(pkl_file.keys())[0]
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total_samples += pkl_file[first_key].numel()
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return segments, total_samples
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def build_attention_mask(input_ids: Tensor, user_token_id: int, multi_turn: bool) -> Tensor:
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seq_len = input_ids.size(0)
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turn_id = input_ids.eq(user_token_id).cumsum(dim=-1)
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iq = turn_id.view(seq_len, 1)
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ik = turn_id.view(1, seq_len)
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# fix the causual attention mask(iq >= ik condition)
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seq_mask = (iq >= ik) if multi_turn else (iq == ik)
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attention_mask = torch.tril(seq_mask)
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# fix the shape (bsz, 1, seq_len, seq_len) unsqueeze for broadcast
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return attention_mask.unsqueeze(0)
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def build_loss_mask(input_ids: Tensor, bos_token_id: int, eos_token_id: int) -> Tensor:
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token_markers = torch.zeros_like(input_ids, dtype=torch.int8)
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is_bos_token = input_ids.eq(bos_token_id)
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is_eos_token = input_ids.eq(eos_token_id)
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# fix the eos_token_id bug(change target_ids to input_ids)
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token_markers[is_bos_token] = 1
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token_markers[is_eos_token] = -1
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cumulative_markers = torch.cumsum(token_markers, dim=-1)
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min_cumulative = cumulative_markers.min(dim=-1, keepdim=True).values
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loss_mask = cumulative_markers - min_cumulative
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return loss_mask.to(dtype=torch.bool)
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class BaseSegmentFetcher:
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def __init__(self, segments: List[Tensor]):
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self.segments = segments
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self.cum_lengths = []
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total = 0
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for seg in segments:
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total += len(seg)
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self.cum_lengths.append(total)
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self.total_length = total if segments else 0
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def fetch_data(self, begin_idx: int, end_idx: int) -> Tensor:
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if not (0 <= begin_idx < self.total_length and 0 <= end_idx <= self.total_length):
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raise ValueError("begin_idx or end_idx out of bounds")
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if begin_idx >= end_idx:
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return torch.tensor([], dtype=torch.long)
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# fix the range index bug
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seg_start_idx = bisect.bisect_right(self.cum_lengths, begin_idx)
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seg_end_idx = bisect.bisect_left(self.cum_lengths, end_idx)
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result_segments = []
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for i in range(seg_start_idx, seg_end_idx + 1):
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prev_cum = self.cum_lengths[i - 1] if i > 0 else 0
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start = max(begin_idx - prev_cum, 0)
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end = min(end_idx - prev_cum, len(self.segments[i]))
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result_segments.append(self.segments[i][start:end])
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return torch.cat(result_segments, dim=0)
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class MutiSegmentFetcher:
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def __init__(self, muti_segments: MutiSeg):
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self.muti_keys = list(muti_segments.keys())
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self.muti_fetchers = {
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key: BaseSegmentFetcher(segments)
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for key, segments in muti_segments.items()
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}
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def key_fetch(self, begin_idx: int, end_idx: int, keys: Union[str, List[str]]) -> Union[Tensor, Seg]:
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fetch_dict = {}
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keys = [keys] if isinstance(keys, str) else keys
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for key in keys:
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fetcher = self.muti_fetchers[key]
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fetch_tensor = fetcher.fetch_data(begin_idx, end_idx)
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fetch_dict[key] = fetch_tensor
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return fetch_dict if len(keys) > 1 else fetch_dict[keys[0]]
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def fetch_data(self, begin_idx: int, end_idx: int) -> Union[Tensor, Seg]:
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return self.key_fetch(begin_idx, end_idx, self.muti_keys)
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class BaseDataset(Dataset, ABC):
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def __init__(self, chunk_size: int):
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super().__init__()
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self.segments: MutiSeg = {}
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self.chunk_size = chunk_size
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self.total_samples = 0
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def save(self, save_path: str):
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keys = list(self.segments.keys())
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if not keys:
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return
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first_item = self.segments[keys[0]]
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segment_size = len(first_item)
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for i in range(segment_size):
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formated_segment = {key: self.segments[key][i] for key in keys}
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pkl.dump(formated_segment, open(f"{save_path}_{i}.pkl", "wb"))
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def load(self, load_path: Union[str, List[str]]):
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paths = [load_path] if isinstance(load_path, str) else load_path
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self.segments, self.total_samples = load_pkl_files(paths)
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self.fetcher = MutiSegmentFetcher(self.segments)
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@abstractmethod
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def __getitem__(self, index: int) -> Dict[str, Tensor]:
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raise NotImplementedError
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def __len__(self) -> int:
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assert self.total_samples // self.chunk_size > 0
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return self.total_samples // self.chunk_size
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class SeqDataset(BaseDataset):
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def __init__(
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self,
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chunk_size,
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):
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super().__init__(chunk_size)
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self.fetcher = MutiSegmentFetcher(self.segments)
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def _fetch_data(self, begin_idx: int, end_idx: int) -> Tensor:
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return self.fetcher.key_fetch(begin_idx, end_idx, "sequence")
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def __getitem__(self, index):
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# fix the range index bug
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begin_idx = min(index * self.chunk_size, self.total_samples - self.chunk_size - 1)
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end_idx = begin_idx + self.chunk_size
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x = self._fetch_data(begin_idx, end_idx).to(dtype=torch.long)
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y = self._fetch_data(begin_idx + 1, end_idx + 1).to(dtype=torch.long)
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return {"input_ids": x, "target_ids": y}
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class SftDataset(BaseDataset):
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def __init__(
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self,
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chunk_size,
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bos_token_id,
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eos_token_id,
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user_token_id,
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multi_turn=False,
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):
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super().__init__(chunk_size)
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self.fetcher = MutiSegmentFetcher(self.segments)
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self.bos_token_id = bos_token_id
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self.eos_token_id = eos_token_id
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self.user_token_id = user_token_id
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self.multi_turn = multi_turn
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def _fetch_data(self, begin_idx: int, end_idx: int) -> Tensor:
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return self.fetcher.key_fetch(begin_idx, end_idx, "sequence")
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def __getitem__(self, index):
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begin_idx = min(index * self.chunk_size, self.total_samples - self.chunk_size - 1)
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end_idx = begin_idx + self.chunk_size
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x = self._fetch_data(begin_idx, end_idx).to(dtype=torch.long)
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y = self._fetch_data(begin_idx + 1, end_idx + 1).to(dtype=torch.long)
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# fix the eos_token_id bug(change target_ids to input_ids)
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loss_mask = build_loss_mask(x, self.bos_token_id, self.eos_token_id)
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attn_mask = build_attention_mask(x, self.user_token_id, self.multi_turn)
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return {"input_ids": x, "target_ids": y, "loss_mask": loss_mask, "attn_mask": attn_mask}
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class DpoDataset(BaseDataset):
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def __init__(self, chunk_size: int):
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super().__init__(chunk_size)
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self.fetcher = MutiSegmentFetcher(self.segments)
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def _fetch_data(self, begin_idx: int, end_idx: int, key: str) -> Tensor:
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return self.fetcher.key_fetch(begin_idx, end_idx, key)
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def __getitem__(self, index: int):
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begin_idx = min(index * self.chunk_size, self.total_samples - self.chunk_size - 1)
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end_idx = begin_idx + self.chunk_size
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chosen = self._fetch_data(begin_idx, end_idx, "chosen").to(dtype=torch.long)
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rejected = self._fetch_data(begin_idx, end_idx, "rejected").to(dtype=torch.long)
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chosen_mask = self._fetch_data(begin_idx, end_idx, "chosen_mask").to(dtype=torch.bool)
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rejected_mask = self._fetch_data(begin_idx, end_idx, "rejected_mask").to(dtype=torch.bool)
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return {"chosen": chosen, "rejected": rejected, "chosen_mask": chosen_mask, "rejected_mask": rejected_mask}
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class PpoDataset(BaseDataset):
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def __init__(self, chunk_size: int):
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super().__init__(chunk_size)
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self.fetcher = MutiSegmentFetcher(self.segments)
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def _fetch_data(self, begin_idx: int, end_idx: int, key: str) -> Tensor:
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return self.fetcher.key_fetch(begin_idx, end_idx, key)
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def __getitem__(self, index: int) -> Dict[str, Tensor]:
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begin_idx = min(index * self.chunk_size, self.total_samples - self.chunk_size - 1)
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end_idx = begin_idx + self.chunk_size
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input_ids = self._fetch_data(begin_idx, end_idx, "input_ids"),
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actions = self._fetch_data(begin_idx, end_idx, "actions"),
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logprobs = self._fetch_data(begin_idx, end_idx, "logprobs"),
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rewards = self._fetch_data(begin_idx, end_idx, "rewards")
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return {"input_ids": input_ids, "actions": actions, "logprobs": logprobs, "rewards": rewards}
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class DatasetLoader:
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@staticmethod
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def load(
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train_type: Literal["seq", "sft", "dpo"],
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load_path: Union[str, List[str]],
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max_len: int,
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**kwargs
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) -> BaseDataset:
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dataset_router: Dict[str, Callable[[int], BaseDataset]] = {
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"seq": lambda max_len: SeqDataset(max_len),
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"sft": lambda max_len: SftDataset(
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max_len,
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bos_token_id=kwargs.get("bos_token_id"),
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eos_token_id=kwargs.get("eos_token_id"),
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user_token_id=kwargs.get("user_token_id"),
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multi_turn=kwargs.get("multi_turn")
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),
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"dpo": lambda max_len: DpoDataset(max_len),
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}
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dataset = dataset_router[train_type](max_len)
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dataset.load(load_path)
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return dataset
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class ResumeableRandomSampler(Sampler[int]):
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def __init__(self, data_source, start_epoch=0, start_iter=0, seed=42):
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self.num_samples = len(data_source)
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self.epoch = start_epoch
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self.iter = start_iter
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generator = torch.Generator()
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generator.manual_seed(seed)
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# consume previous epochs
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for _ in range(start_epoch):
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torch.randperm(self.num_samples, generator=generator)
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self.generator = generator
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self._indices = None
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def _get_indices(self):
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current_epoch_indices = torch.randperm(self.num_samples, generator=self.generator).tolist()
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self._indices = current_epoch_indices[self.iter % self.num_samples:]
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def __iter__(self):
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if self._indices is None:
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self._get_indices()
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for i in self._indices:
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self.iter += 1
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yield i
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self.epoch += 1
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self._indices = None
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def __len__(self):
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if self._indices is None:
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self._get_indices()
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return len(self._indices) |