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删除了1312-1315行多余代码，训练和评测verbose改为1并重新生成了输出。
删除了原先的位置，增加了预训练词向量文件夹
修改了两处说明（Line9,190），修改了最近修改时间（Line15）
rewrite some discriptions
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补充了对输入的详细说明；将数据集替换为飞桨官方数据集；补充了自动写诗的说明；对章节进行了划分和标序
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1、不建议将 import paddlenlp as ppnlp 直接 import paddlenlp 即可 |
update the newest url for paddlenlp; update the new API for paddlenlp.
merge op of load_dataset for test, dev, and train.
TCChenlong
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Jun 18, 2021
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整体写的很好，有一些表述需要完善下，辛苦~
| "### 3.1 预训练BERT模型\n", | ||
| "古诗生成是一个文本生成的过程，在实际中模型无法获知还未生成的内容，也即BERT中的双向关系中只能捕捉到前向关系而不能捕捉到后向关系。这个限制我们可以通过添加注意力掩码（attention mask）来屏蔽掉后向的关系，使模型无法注意到还未生成的内容，从而使BERT仍能完成文本生成任务。\n", | ||
| "\n", | ||
| "进一步地，我们可以将文本生成简化为基于BERT的词分类模型（理解为词性标注），即赋予每个词一个标签，该标签即该词后的下一个词是什么。因此，我们直接调用PaddleNLP的BERT词分类模型即可看，需注意模型分类的类别为词表长度。" |
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即赋予每个词一个标签，该标签即该词后的下一个词是什么。
这一句的描述不是很清晰，建议补充一个例子来说明；
因此，我们直接调用PaddleNLP的BERT词分类模型即可看，
这一句似乎不全吧？
| }, | ||
| "source": [ | ||
| "## 4. 古诗生成\n", | ||
| "以下，我们定义一个类来利用已经训练好的模型完成古诗生成的任务。在生成古诗的过程中，我们将已经生成的内容作为输入，编码后输入模型，得到输入中每个词对应的分类结果。然后选取最后一个词的分类结果作为下一个待预测的词。下一轮中，刚刚预测的词将加入到已生成的内容中，继续进行下一个词的预测。\n", |
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然后选取最后一个词的分类结果作为下一个待预测的词
这句有点歧义，建议改为：
作为下一个待预测的词 -> 作为根据当前内容要预测的词
| " self.sequence_length = input_length\r\n", | ||
| " self.lower_triangle_mask = paddle.tril(paddle.tensor.full((input_length, input_length), 1, 'float32'))\r\n", | ||
| "\r\n", | ||
| " def forward(self, token, token_type, input_mask, input_length=None):\r\n", |
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