h-transformer-1d

H-Transformer-1D

H-Transformer-1D的实现，使用分层注意力进行序列学习的Transformer，具有亚二次方的计算成本。该架构的编码器（非自回归）版本目前在Long Range Arena（一个高效Transformer的基准测试）中保持领先地位。

131k tokens

安装

$ pip install h-transformer-1d

使用

import torch
from h_transformer_1d import HTransformer1D

model = HTransformer1D(
    num_tokens = 256,          # 标记数量
    dim = 512,                 # 维度
    depth = 12,                # 深度
    causal = False,            # 是否自回归
    max_seq_len = 8192,        # 最大序列长度
    heads = 8,                 # 注意力头数
    dim_head = 64,             # 每个注意力头的维度
    block_size = 128,          # 块大小
    reversible = True,         # 使用可逆性，以增加深度的同时节省内存
    shift_tokens = True        # 是否在序列维度上将一半特征空间移动一位，以加快收敛（实验性功能）
)

x = torch.randint(0, 256, (1, 8000))   # 可变序列长度
mask = torch.ones((1, 8000)).bool()    # 可变掩码长度

# 网络将自动填充到2的幂次，进行分层注意力等操作

logits = model(x, mask = mask) # (1, 8000, 256)

引用

@misc{zhu2021htransformer1d,
    title   = {H-Transformer-1D: Fast One-Dimensional Hierarchical Attention for Sequences}, 
    author  = {Zhenhai Zhu and Radu Soricut},
    year    = {2021},
    eprint  = {2107.11906},
    archivePrefix = {arXiv},
    primaryClass = {cs.LG}
}

@software{peng_bo_2021_5196578,
    author       = {PENG Bo},
    title        = {BlinkDL/RWKV-LM: 0.01},
    month        = {aug},
    year         = {2021},
    publisher    = {Zenodo},
    version      = {0.01},
    doi          = {10.5281/zenodo.5196578},
    url          = {https://doi.org/10.5281/zenodo.5196578}
}