568 lines
19 KiB
Python
568 lines
19 KiB
Python
import torch
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from torch import Tensor
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from typing import List, Tuple, Union, Optional, Generator, Self
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from khaosz.core.parameter import ModelParameter
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def build_prompt(query: str, history: Optional[List[Tuple[str, str]]] = None) -> str:
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"""
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Build prompt for query and history
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Args:
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query(str): query string
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history(Optional[List[Tuple[str, str]]]): history list of query and response
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Returns:
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str: prompt string
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"""
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prompt_parts = []
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if history is None:
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history = []
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for his_query, his_response in history:
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prompt_parts.append(f"<|user|> {his_query} <|system|> <bos>{his_response}<eos>")
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if query is not None:
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prompt_parts.append(f"<|user|> {query} <|system|> <bos>")
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return "\n".join(prompt_parts)
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def pad_sequence(ids_list: List[List[int]], max_ids_len: int, pad_id: int) -> List[List[int]]:
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"""
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Pad a list of sequences to a fixed length.
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Args:
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ids_list (List[List[int]]): A list of sequences.
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max_ids_len (int): The maximum length of sequences.
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pad_id (int): The id to pad sequences.
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Returns:
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List[List[int]]: A list of padded sequences.
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"""
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new_ids_list = []
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for ids in ids_list:
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pad_len = max_ids_len - len(ids)
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padded_seq = [pad_id] * pad_len + ids
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new_ids_list.append(padded_seq)
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return new_ids_list
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def apply_sampling_strategies(
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logits: Tensor,
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temperature: float,
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top_k: int,
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top_p: float,
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filter_value: float = -float("inf")
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) -> Tensor:
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"""
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Apply sampling strategies to the logits tensor.
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Args:
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logits (Tensor): The logits tensor.
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temperature (float): The temperature parameter.
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top_k (int): The top-k parameter.
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top_p (float): The top-p parameter.
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filter_value (float, optional): The filter value. Defaults to -float("inf").
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Returns:
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Tensor: The sampled logits tensor.
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"""
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if temperature != 1.0:
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logits = logits / temperature
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if top_k > 0:
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top_k = min(top_k, logits.size(-1))
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indices_to_remove = logits < torch.topk(logits, top_k, dim=-1)[0][..., -1, None]
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logits[indices_to_remove] = filter_value
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if top_p < 1.0:
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sorted_logits, sorted_indices = torch.sort(logits, descending=True, dim=-1)
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cumulative_probs = torch.cumsum(torch.softmax(sorted_logits, dim=-1), dim=-1)
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sorted_indices_to_remove = cumulative_probs > top_p
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sorted_indices_to_remove[..., 1:] = sorted_indices_to_remove[..., :-1].clone()
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sorted_indices_to_remove[..., 0] = 0
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indices_to_remove = torch.zeros_like(logits, dtype=torch.bool)
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indices_to_remove.scatter_(
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dim=1,
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index=sorted_indices,
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src=sorted_indices_to_remove
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)
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logits[indices_to_remove] = filter_value
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return logits
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class KVCacheManager:
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def __init__(
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self,
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num_layers: int,
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batch_size: int,
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max_len: int,
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num_heads: int,
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head_dim: int,
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device: torch.device = "cuda",
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dtype: torch.dtype = torch.bfloat16
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):
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self.num_layers = num_layers
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self.batch_size = batch_size
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self.max_len = max_len
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self.num_heads = num_heads
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self.head_dim = head_dim
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self.device = device
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self.dtype = dtype
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self._kv_cache: List[Tuple[Tensor, Tensor]] = None
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self._seq_mask: Tensor = None
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self._initialize()
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def _initialize(self):
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self._kv_cache = []
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for _ in range(self.num_layers):
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k_cache = torch.zeros(
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(self.batch_size, self.max_len, self.num_heads, self.head_dim),
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device=self.device, dtype=self.dtype
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)
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v_cache = torch.zeros(
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(self.batch_size, self.max_len, self.num_heads, self.head_dim),
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device=self.device, dtype=self.dtype
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)
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self._kv_cache.append((k_cache, v_cache))
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self._seq_mask = torch.ones(
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(self.batch_size, self.max_len),
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device=self.device, dtype=torch.bool
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)
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def update(self, active_mask: Tensor):
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for i in range(self.num_layers):
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k_cache, v_cache = self._kv_cache[i]
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new_k_cache, new_v_cache = k_cache[active_mask], v_cache[active_mask]
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self._kv_cache[i] = (new_k_cache, new_v_cache)
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self._seq_mask = self._seq_mask[active_mask]
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def reset(self, full_reset=False):
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if full_reset:
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self._kv_cache = None
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self._seq_mask = None
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else:
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self._initialize()
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def set_seq_mask(self, input_ids: Tensor, pad_id: int):
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batch_size, seq_len = input_ids.shape
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bool_mask = (input_ids != pad_id)
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self._seq_mask[: batch_size, : seq_len] = bool_mask
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def get_kvcache(self) -> List[Tuple[Tensor, Tensor]]:
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return self._kv_cache
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def get_seq_mask(self) -> Tensor:
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return self._seq_mask
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class GeneratorCore:
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def __init__(self, parameter: ModelParameter):
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self.model = parameter.model
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self.tokenizer = parameter.tokenizer
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self.config = parameter.config
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def compute_logits(
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self,
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input_ids: Tensor,
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attn_mask: Optional[Tensor] = None,
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kv_caches: Optional[List[Tuple[Tensor, Tensor]]] = None,
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start_pos: int = 0
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) -> Tuple[Tensor, int]:
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with torch.inference_mode():
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outputs = self.model(input_ids, attn_mask, kv_caches, start_pos)
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logits = outputs["logits"][:, -1, :]
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cache_increase = input_ids.size(-1)
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return logits, cache_increase
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def to(self, *args, **kargs) -> Self:
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self.model.to(*args, **kargs)
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return self
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class EmbeddingEncoderCore:
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def __init__(self, parameter: ModelParameter):
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self.model = parameter.model
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self.tokenizer = parameter.tokenizer
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self.config = parameter.config
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def encode(self, sentence: Union[str, List[str]]) -> Union[Tensor, List[Tensor]]:
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with_batch = isinstance(sentence, list)
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ids = self.tokenizer.encode(sentence)
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batch_ids = ids if with_batch else [ids]
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max_model_len = self.config.m_len
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all_fragments = []
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fragment_origin_idx = []
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for i, seq in enumerate(batch_ids):
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if len(seq) > max_model_len:
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fragments = [seq[j:j+max_model_len] for j in range(0, len(seq), max_model_len)]
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all_fragments.extend(fragments)
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fragment_origin_idx.extend([i] * len(fragments))
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else:
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all_fragments.append(seq)
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fragment_origin_idx.append(i)
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#if empty fragments
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if not all_fragments or not ids:
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return [] if with_batch else torch.tensor([])
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device = next(self.model.parameters()).device
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max_len = min(max(len(seq) for seq in all_fragments), max_model_len)
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padded_ids = []
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masks = []
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for seq in all_fragments:
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pad_len = max_len - len(seq)
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padded_seq = seq + [self.tokenizer.pad_id] * pad_len
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mask = [token_id != self.tokenizer.pad_id for token_id in padded_seq]
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padded_ids.append(padded_seq)
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masks.append(mask)
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input_tensor = torch.tensor(padded_ids, device=device, dtype=torch.long)
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seq_mask = torch.tensor(masks, device=device, dtype=torch.bool)
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with torch.inference_mode():
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outputs = self.model(input_tensor, seq_mask)["hidden_states"]
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# [num_fragments, seq_len, hidden_size]
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fragment_embs = torch.mul(outputs, seq_mask.unsqueeze(-1))
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sentence_embs: List[Tensor] = []
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for i in range(len(batch_ids)):
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indices = [idx for idx, orig_idx in enumerate(fragment_origin_idx) if orig_idx == i]
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if indices is not None:
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sum_frags = torch.sum(fragment_embs[indices, :, :], dim=1) # [frags, hidden_size]
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length = torch.sum(seq_mask[indices, :], dim=1).unsqueeze(1) # [frags, 1]
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emb = torch.sum(sum_frags / length, dim=0) # [frags, hidden_size]
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sentence_embs.append(emb.flatten())
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if with_batch:
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return [emb.flatten() for emb in sentence_embs]
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else:
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return sentence_embs[0].flatten()
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def to(self, *args, **kargs) -> Self:
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self.model.to(*args, **kargs)
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return self
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class TextGenerator(GeneratorCore):
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def __init__(self, parameter: ModelParameter):
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super().__init__(parameter)
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def generate(
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self,
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query: str,
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temperature: float,
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top_k: int,
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top_p: float,
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) -> str:
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assert temperature >= 0.0
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assert top_k >= 0
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assert top_p >= 0.0 and top_p <= 1.0
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device = next(self.model.parameters()).device
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cache_manager = KVCacheManager(
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num_layers=self.config.n_layer,
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batch_size=1,
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max_len=self.config.m_len,
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num_heads=self.config.n_kvhead,
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head_dim=self.config.n_dim // self.config.n_head,
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device=device,
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)
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ids = self.tokenizer.encode(query)
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input_ids = torch.tensor([ids], device=device, dtype=torch.long)
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start_cache_pos = len(ids)
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cur_cache_pos = 0
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self.model.eval()
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while len(ids) < self.config.m_len:
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kv_caches = cache_manager.get_kvcache()
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logits, cache_increase = self.compute_logits(
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input_ids,
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kv_caches=kv_caches,
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start_pos=cur_cache_pos
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)
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logits = apply_sampling_strategies(logits, temperature, top_k, top_p)
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probs = torch.softmax(logits, dim=-1)
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next_token_id = torch.multinomial(probs, num_samples=1)
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input_ids = next_token_id
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ids.append(next_token_id.item())
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cur_cache_pos += cache_increase
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if next_token_id.item() in self.tokenizer.stop_ids:
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break
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response = self.tokenizer.decode(ids[start_cache_pos:])
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return response
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class ChatGenerator(GeneratorCore):
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def __init__(self, parameter: ModelParameter):
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super().__init__(parameter)
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def generate(
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self,
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query: str,
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history: List[Tuple[str, str]],
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temperature: float,
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top_k: int,
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top_p: float,
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) -> str:
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assert temperature >= 0.0
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assert top_k >= 0
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assert top_p >= 0.0 and top_p <= 1.0
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if history is None:
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history = []
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device = next(self.model.parameters()).device
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cache_manager = KVCacheManager(
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num_layers=self.config.n_layer,
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batch_size=1,
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max_len=self.config.m_len,
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num_heads=self.config.n_kvhead,
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head_dim=self.config.n_dim // self.config.n_head,
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device=device,
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)
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ids = self.tokenizer.encode(build_prompt(query, history))
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input_ids = torch.tensor([ids], device=device, dtype=torch.long)
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cpy_history = history.copy()
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start_cache_pos = len(ids)
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cur_cache_pos = 0
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self.model.eval()
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while len(ids) < self.config.m_len:
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kv_caches = cache_manager.get_kvcache()
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logits, cache_increase = self.compute_logits(
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input_ids,
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kv_caches=kv_caches,
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start_pos=cur_cache_pos
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)
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logits = apply_sampling_strategies(logits, temperature, top_k, top_p)
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probs = torch.softmax(logits, dim=-1)
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next_token_id = torch.multinomial(probs, num_samples=1)
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input_ids = next_token_id
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ids.append(next_token_id.item())
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cur_cache_pos += cache_increase
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if next_token_id.item() in self.tokenizer.stop_ids:
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break
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response = self.tokenizer.decode(ids[start_cache_pos:])
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cpy_history.append((query, response))
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return response, cpy_history
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class StreamGenerator(GeneratorCore):
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def __init__(self, parameter: ModelParameter):
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super().__init__(parameter)
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def generate(
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self,
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query: str,
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history: List[Tuple[str, str]],
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temperature: float,
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top_k: int,
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top_p: float,
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) -> Generator[Tuple[str, List[Tuple[str, str]]], None, None]:
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assert temperature >= 0.0
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assert top_k >= 0
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assert top_p >= 0.0 and top_p <= 1.0
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if history is None:
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history = []
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device = next(self.model.parameters()).device
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cache_manager = KVCacheManager(
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num_layers=self.config.n_layer,
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batch_size=1,
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max_len=self.config.m_len,
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num_heads=self.config.n_kvhead,
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head_dim=self.config.n_dim // self.config.n_head,
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device=device,
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)
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ids = self.tokenizer.encode(build_prompt(query, history))
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input_ids = torch.tensor([ids], device=device, dtype=torch.long)
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cpy_history = history.copy()
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start_cache_pos = len(ids)
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cur_cache_pos = 0
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self.model.eval()
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while len(ids) < self.config.m_len:
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kv_caches = cache_manager.get_kvcache()
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logits, cache_increase = self.compute_logits(
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input_ids,
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kv_caches=kv_caches,
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start_pos=cur_cache_pos
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)
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logits = apply_sampling_strategies(logits, temperature, top_k, top_p)
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probs = torch.softmax(logits, dim=-1)
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next_token_id = torch.multinomial(probs, num_samples=1)
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input_ids = next_token_id
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ids.append(next_token_id.item())
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cur_cache_pos += cache_increase
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response = self.tokenizer.decode(ids[start_cache_pos:])
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yield response, cpy_history + [(query, response)]
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if next_token_id.item() in self.tokenizer.stop_ids:
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yield response + "\n", cpy_history + [(query, response)]
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break
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class BatchGenerator(GeneratorCore):
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def __init__(self, parameter: ModelParameter):
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super().__init__(parameter)
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def generate(
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self,
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queries: List[str],
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histories: List[List[Tuple[str, str]]],
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temperature: float,
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top_k: int,
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top_p: float
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) -> List[str]:
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assert temperature >= 0.0
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assert top_k >= 0
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assert top_p >= 0.0 and top_p <= 1.0
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batch_size = len(queries)
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if histories is None:
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histories = [[] for _ in range(batch_size)]
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prompts = [build_prompt(query, history) for query, history in zip(queries, histories)]
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ids_list = [self.tokenizer.encode(prompt) for prompt in prompts]
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max_ids_len = max(len(ids) for ids in ids_list)
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ids_list = pad_sequence(ids_list, max_ids_len, self.tokenizer.pad_id)
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device = next(self.model.parameters()).device
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cache_manager = KVCacheManager(
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num_layers=self.config.n_layer,
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batch_size=batch_size,
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max_len=self.config.m_len,
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num_heads=self.config.n_kvhead,
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head_dim=self.config.n_dim // self.config.n_head,
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device=device,
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)
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input_tensor = torch.tensor(ids_list, device=device, dtype=torch.long)
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cache_manager.set_seq_mask(input_tensor, self.tokenizer.pad_id)
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activate_task_mask = [True] * batch_size
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start_cache_pos = max_ids_len
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cur_cache_pos = 0
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while max_ids_len < self.config.m_len and sum(activate_task_mask) != 0:
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kv_caches = cache_manager.get_kvcache()
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attn_mask =cache_manager.get_seq_mask()
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logits, cache_increase = self.compute_logits(
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input_tensor,
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attn_mask=attn_mask,
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kv_caches=kv_caches,
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start_pos=cur_cache_pos
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)
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cur_cache_pos += cache_increase
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logits = apply_sampling_strategies(logits, temperature, top_k, top_p)
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probs = torch.softmax(logits, dim=-1)
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next_token_id = torch.multinomial(probs, num_samples=1)
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active_mask = []
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c_ids = 0
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for i in range(batch_size):
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if activate_task_mask[i]:
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token = next_token_id[c_ids, :].item()
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ids_list[i].append(token)
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c_ids += 1
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is_active = not token in self.tokenizer.stop_ids
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activate_task_mask[i] = is_active
|
|
active_mask.append(is_active)
|
|
|
|
active_mask = torch.tensor(active_mask, device=device, dtype=torch.bool)
|
|
cache_manager.update(active_mask)
|
|
input_tensor = next_token_id[active_mask, :]
|
|
|
|
max_ids_len += 1
|
|
|
|
|
|
responses = [str()] * batch_size
|
|
for i in range(batch_size):
|
|
responses[i] = self.tokenizer.decode(ids_list[i][start_cache_pos:])
|
|
histories[i].append((queries[i], responses[i]))
|
|
|
|
return responses
|
|
|
|
|
|
|
|
class RetrievalGenerator(GeneratorCore):
|
|
def __init__(self, retriever_parameter: ModelParameter):
|
|
super().__init__(retriever_parameter)
|
|
|
|
def generate(
|
|
self,
|
|
retrieved: List[str],
|
|
query: str,
|
|
history: List[Tuple[str, str]],
|
|
temperature: float,
|
|
top_k: int,
|
|
top_p: float,
|
|
) -> str:
|
|
assert temperature >= 0.0
|
|
assert top_k >= 0
|
|
assert top_p >= 0.0 and top_p <= 1.0
|
|
|
|
if history is None:
|
|
history = []
|
|
|
|
retrieved = "\n".join([f"{idx + 1}. {key}" for idx, key in enumerate(retrieved)]) if retrieved else ""
|
|
retrieved_query = f"{retrieved}<eos>\n\n根据以上内容回答: {query}" if retrieved else query
|
|
parameter = ModelParameter(self.model, self.tokenizer, self.config)
|
|
|
|
return ChatGenerator(parameter).generate(
|
|
retrieved_query,
|
|
history,
|
|
temperature=temperature,
|
|
top_k=top_k,
|
|
top_p=top_p,
|
|
)
|
|
|
|
class EmbeddingEncoder(EmbeddingEncoderCore):
|
|
def __init__(self, parameter: ModelParameter):
|
|
super().__init__(parameter)
|
|
|
|
def encode(self, sentence: Union[str, List[str]]) -> Union[Tensor, List[Tensor]]:
|
|
return super().encode(sentence)
|
|
|