Question

我需要的是一个在某个“单词距离”内查找单词的功能。 “他的车上有一袋工具”这句话很有趣。

使用Quanteda kwic函数，我可以分别找到“ bag”和“ tool”，但这常常使我产生过多的结果。我需要彼此之间五个字之内的“袋子”和“工具”。

Answer 1

您可以使用fcm()函数来计算固定窗口（例如5个单词）中的同时出现。这将创建一个“功能共现矩阵”，并且可以针对任何大小的令牌范围或整个文档的上下文进行定义。

对于您的示例，或者至少是基于我对您的问题的解释的示例，这看起来像：

library("quanteda")
## Package version: 1.4.3
## Parallel computing: 2 of 12 threads used.
## See https://quanteda.io for tutorials and examples.

txt <- c(
  d1 = "He had a bag of tools in his car",
  d2 = "bag other other other other tools other"
)
fcm(txt, context = "window", window = 5)
## Feature co-occurrence matrix of: 10 by 10 features.
## 10 x 10 sparse Matrix of class "fcm"
##         features
## features He had a bag of tools in his car other
##    He     0   1 1   1  1     1  0   0   0     0
##    had    0   0 1   1  1     1  1   0   0     0
##    a      0   0 0   1  1     1  1   1   0     0
##    bag    0   0 0   0  1     2  1   1   1     4
##    of     0   0 0   0  0     1  1   1   1     0
##    tools  0   0 0   0  0     0  1   1   1     5
##    in     0   0 0   0  0     0  0   1   1     0
##    his    0   0 0   0  0     0  0   0   1     0
##    car    0   0 0   0  0     0  0   0   0     0
##    other  0   0 0   0  0     0  0   0   0    10

在这里，术语 bag 在第一个文档的 tool 的5个标记中出现一次。在第二份文档中，它们之间的距离超过了5个令牌，因此不计算在内。

是否有R函数可在某个“单词距离”内查找关键字？

1 个答案: