Terry toolkit tkitAutoMask,

Project description

tkitAutoMask

自动构建掩码加入多种动态掩码合集，上下三角和动态片段，以及默认的概率

-上三角，实现类似从左到右的预测，就是单向注意，用于续写。

片段，连续多个mask，更加适合解决补全。

未来尝试加入模板预测掩码

pip install tkitAutoMask

from tkitAutoMask import autoMask
from transformers import BertTokenizer
tokenizer = BertTokenizer.from_pretrained("uer/chinese_roberta_L-2_H-128") 
# dir(tokenizer)
tomask = autoMask(
    # transformer,
    mask_token_id = tokenizer.mask_token_id,          # the token id reserved for masking
    pad_token_id = -100,           # the token id for padding
    mask_prob = 0.05,           # 仅仅是常规的掩码比例 masking probability for masked language modeling
    replace_prob = 0.90,        # ~10% probability that token will not be masked, but included in loss, as detailed in the epaper
    mask_ignore_token_ids = [tokenizer.cls_token_id,tokenizer.eos_token_id]  # other tokens to exclude from masking, include the [cls] and [sep] here
)


# x=torch.ones(5,5)
x = torch.randint(0, 20000, (10, 10))
for i in range(10):
  a,b=tomask(x)
  # a,b
  print(b)

labels：形状为[batch_size, seq_length] ，代表MLM任务的标签，注意这里对于原本未被遮盖的词设置为-100，被遮盖词才会有它们对应的id，和任务设置是反过来的。例如，原始句子是I want to [MASK] an apple，这里我把单词eat给遮住了输入模型，对应的label设置为[-100, -100, -100, 【eat对应的id】, -100, -100]；为什么要设置为-100而不是其他数？因为torch.nn.CrossEntropyLoss默认的ignore_index=-100，也就是说对于标签为100的类别输入不会计算loss。

tensor([[ -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  6238,  -100],
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tensor([[ -100,  -100,  1312,  -100,  -100,  -100,  -100,  -100,  -100,  -100],
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tensor([[ -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  4867],
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tensor([[ 2649,  3837,  1312, 12421, 15558,  -100,  -100,  -100,  -100,  -100],
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tensor([[ -100,  -100,  -100,  -100, 15558,  -100,  -100,  -100,  -100,  -100],
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tensor([[ -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  4867],
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        [ -100,  -100,  -100,  -100, 14118,  -100,  -100,  -100,  -100,  -100]])
tensor([[ -100,  -100,  -100,  -100,  -100,  -100,  7519,  -100,  -100,  -100],
        [15670,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100],
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        [ -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  4658],
        [12488,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100],
        [ -100,  -100, 16031,  -100,  -100,  -100,  -100,  -100,  -100,  -100]])
tensor([[ 2649,  3837,  1312,  -100,  -100,   976,  -100,  -100,  -100,  -100],
        [ -100, 15820,  2654,  3647,  -100,  -100,  -100,  -100,  -100,  -100],
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        [ -100,  -100,  -100,  -100,  -100,  -100,  -100, 18083, 14632,  4658],
        [ -100,  -100,  -100,  -100,  -100,  -100,  -100, 19026, 10558,    77],
        [ -100,   457,  -100,  -100,  -100,  -100,  -100,  -100,  -100, 12816]])
tensor([[ -100,  -100,  -100,  -100,  -100,  -100,  7519,  -100,  -100,  -100],
        [ -100,  -100,  2654,  -100,  -100,  -100,  -100,  -100,  -100,  -100],
        [ -100,  -100,  -100,  -100,  4748,  -100,  -100,  -100,  -100,  -100],
        [ -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  7381,  -100],
        [ -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  7539,  -100],
        [ -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  8122,  -100],
        [ -100,  -100,  -100,  -100,  -100,  -100, 12610,  -100,  -100,  -100],
        [ -100,  -100, 16203,  -100,  -100,  -100,  -100,  -100,  -100,  -100],
        [ -100,  -100,  -100,  -100,  -100,  6458,  -100,  -100,  -100,  -100],
        [ -100,  -100,  -100,  -100,  -100,  4127,  -100,  -100,  -100,  -100]])
tensor([[ -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  6238,  -100],
        [ -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  7849],
        [ -100,  -100,  -100,  -100,  4748,  -100,  -100,  -100,  -100,  -100],
        [ -100,  -100,  -100,  -100,  -100, 18414,  -100,  -100,  -100,  -100],
        [ -100,  -100,  -100,  -100,  -100, 14913,  -100,  -100,  -100,  -100],
        [ -100,  -100,  -100, 16312,  -100,  -100,  -100,  -100,  -100,  -100],
        [ -100,   928,  -100,  -100,  -100,  -100,  -100,  -100,  -100,  -100],
        [ -100,  -100,  -100,  -100,  -100,  -100, 19242,  -100,  -100,  -100],
        [ -100,  -100,  -100,  -100,  -100,  6458,  -100,  -100,  -100,  -100],
        [ -100,  -100,  -100,  -100,  -100,  4127,  -100,  -100,  -100,  -100]])

其他测试

https://colab.research.google.com/drive/1CvkoJ1pZQDRWGPA-5IzJufvocBM-RVT2#scrollTo=UwkociF5ZF-d

https://colab.research.google.com/drive/1kNHD0I0wH3WBpJXPdgZqs0MZTRnGD-ok#scrollTo=6M1ZXRsuxZAa

unilm_mask注意力写法 https://colab.research.google.com/drive/11IDalP2xNYWzF4gIz6T3yTjp53UqzkOe#scrollTo=gFeycxpykrCx

详细参考

dev.md

Project details

Release history Release notifications | RSS feed

0.0.0.316483919

Mar 27, 2022

0.0.0.316483908

Mar 27, 2022

0.0.0.316483598

Mar 27, 2022

This version

0.0.0.316394070

Dec 13, 2021

0.0.0.316394069

Dec 13, 2021

0.0.0.316350799

Oct 24, 2021

0.0.0.116347453

Oct 20, 2021

0.0.0.116337015

Oct 8, 2021

0.0.0.116337011

Oct 8, 2021

0.0.0.116337010

Oct 8, 2021

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