提交vllm0.11.0开发分支
This commit is contained in:
@@ -1,91 +0,0 @@
|
||||
# SPDX-License-Identifier: Apache-2.0
|
||||
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
|
||||
|
||||
import torch
|
||||
from vllm.utils import is_pin_memory_available, make_tensor_with_pad
|
||||
|
||||
|
||||
def get_token_bin_counts_and_mask(
|
||||
tokens: torch.Tensor,
|
||||
vocab_size: int,
|
||||
num_seqs: int,
|
||||
) -> tuple[torch.Tensor, torch.Tensor]:
|
||||
# Compute the bin counts for the tokens.
|
||||
# vocab_size + 1 for padding.
|
||||
bin_counts = torch.zeros((num_seqs, vocab_size + 1),
|
||||
dtype=torch.long,
|
||||
device=tokens.device)
|
||||
bin_counts.scatter_add_(1, tokens, torch.ones_like(tokens))
|
||||
bin_counts = bin_counts[:, :vocab_size]
|
||||
mask = bin_counts > 0
|
||||
|
||||
return bin_counts, mask
|
||||
|
||||
def apply_penalties(logits: torch.Tensor, prompt_tokens_tensor: torch.Tensor,
|
||||
output_tokens_tensor: torch.Tensor,
|
||||
presence_penalties: torch.Tensor,
|
||||
frequency_penalties: torch.Tensor,
|
||||
repetition_penalties: torch.Tensor) -> torch.Tensor:
|
||||
"""
|
||||
Applies penalties in place to the logits tensor
|
||||
logits : The input logits tensor of shape [num_seqs, vocab_size]
|
||||
prompt_tokens_tensor: A tensor containing the prompt tokens. The prompts
|
||||
are padded to the maximum prompt length within the batch using
|
||||
`vocab_size` as the padding value. The value `vocab_size` is used
|
||||
for padding because it does not correspond to any valid token ID
|
||||
in the vocabulary.
|
||||
output_tokens_tensor: The output tokens tensor.
|
||||
presence_penalties: The presence penalties of shape (num_seqs, )
|
||||
frequency_penalties: The frequency penalties of shape (num_seqs, )
|
||||
repetition_penalties: The repetition penalties of shape (num_seqs, )
|
||||
"""
|
||||
num_seqs, vocab_size = logits.shape
|
||||
_, prompt_mask = get_token_bin_counts_and_mask(prompt_tokens_tensor,
|
||||
vocab_size, num_seqs)
|
||||
output_bin_counts, output_mask = get_token_bin_counts_and_mask(
|
||||
output_tokens_tensor, vocab_size, num_seqs)
|
||||
|
||||
# Apply repetition penalties as a custom op
|
||||
from vllm._custom_ops import apply_repetition_penalties_torch
|
||||
apply_repetition_penalties_torch(logits, prompt_mask, output_mask,
|
||||
repetition_penalties)
|
||||
|
||||
# We follow the definition in OpenAI API.
|
||||
# Refer to https://platform.openai.com/docs/api-reference/parameter-details
|
||||
logits -= frequency_penalties.unsqueeze(dim=1) * output_bin_counts
|
||||
logits -= presence_penalties.unsqueeze(dim=1) * output_mask
|
||||
return logits
|
||||
|
||||
def apply_all_penalties(
|
||||
logits: torch.Tensor,
|
||||
prompt_token_ids: torch.Tensor,
|
||||
presence_penalties: torch.Tensor,
|
||||
frequency_penalties: torch.Tensor,
|
||||
repetition_penalties: torch.Tensor,
|
||||
output_token_ids: list[list[int]],
|
||||
) -> torch.Tensor:
|
||||
"""
|
||||
Applies presence, frequency and repetition penalties to the logits.
|
||||
"""
|
||||
_, vocab_size = logits.shape
|
||||
output_tokens_t = _convert_to_tensors(output_token_ids, vocab_size,
|
||||
logits.device)
|
||||
return apply_penalties(logits, prompt_token_ids, output_tokens_t,
|
||||
presence_penalties, frequency_penalties,
|
||||
repetition_penalties)
|
||||
|
||||
def _convert_to_tensors(output_token_ids: list[list[int]], vocab_size: int,
|
||||
device: torch.device) -> torch.Tensor:
|
||||
"""
|
||||
Convert the different list data structures to tensors.
|
||||
"""
|
||||
output_tokens_tensor = make_tensor_with_pad(
|
||||
output_token_ids,
|
||||
# Use the value of vocab_size as a pad since we don't have a
|
||||
# token_id of this value.
|
||||
pad=vocab_size,
|
||||
device="cpu",
|
||||
dtype=torch.int64,
|
||||
pin_memory=is_pin_memory_available(),
|
||||
)
|
||||
return output_tokens_tensor.to(device, non_blocking=True)
|
||||
@@ -22,7 +22,7 @@ class TopKTopPSampler(nn.Module):
|
||||
Implementations may update the logits tensor in-place.
|
||||
"""
|
||||
|
||||
def __init__(self):
|
||||
def __init__(self, logprobs_mode):
|
||||
super().__init__()
|
||||
logger.info_once(
|
||||
"Using FlashInfer for top-p & top-k sampling.")
|
||||
@@ -57,7 +57,7 @@ class TopKTopPSampler(nn.Module):
|
||||
# not needed. This is because `random_sample` does not require
|
||||
# CPU-GPU synchronization while `flashinfer_sample` does.
|
||||
probs = logits.softmax(dim=-1, dtype=torch.float32)
|
||||
return random_sample(probs, generators)
|
||||
return random_sample(probs, generators), None
|
||||
if generators:
|
||||
logger.warning_once("FlashInfer 0.2.3+ does not support "
|
||||
"per-request generators. Falling back to "
|
||||
@@ -66,8 +66,7 @@ class TopKTopPSampler(nn.Module):
|
||||
# flashinfer sampling functions expect contiguous logits.
|
||||
# In flex_attn/triton_attn fp32 inference, logits can be non-contiguous
|
||||
# because of slicing operation in logits_processor.
|
||||
return flashinfer_sample(logits.contiguous(), k, p, generators)
|
||||
|
||||
return flashinfer_sample(logits.contiguous(), k, p, generators), None
|
||||
|
||||
|
||||
def apply_top_k_top_p(
|
||||
@@ -195,4 +194,4 @@ def flashinfer_sample(
|
||||
next_token_ids = xtorch_ops.top_k_top_p_sampling_from_probs(
|
||||
probs, top_k=k, top_p=p, deterministic=True)
|
||||
|
||||
return next_token_ids.view(-1)
|
||||
return next_token_ids.view(-1)
|
||||
Reference in New Issue
Block a user