提交 b82049bd 编写于 作者: Y Yibing Liu

revise the doc in ctc_edit_distance_op

上级 116687a8
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......@@ -58,12 +58,19 @@ class CTCEditDistanceOpMaker : public framework::OpProtoAndCheckerMaker {
AddComment(R"DOC(
CTCEditDistance operator computes the edit distance of two sequences, one named
hypothesis and another named reference.
hypothesis with length M and another named reference with length N.
Edit distance measures how dissimilar two strings, one is hypothesis and another
is reference, are by counting the minimum number of operations to transform
one string into anthor.
Edit distance, also called Levenshtein distance, measures how dissimilar two strings
are by counting the minimum number of operations to transform one string into anthor.
Here the operations include insertion, deletion, and substitution. For example,
given hypothesis string A = "kitten" and reference B = "sitting", the edit distance
is 3 for A will be transformed into B at least after two substitutions and one
insertion:
"kitten" -> "sitten" -> "sittin" -> "sitting"
If Attr(normalized) is true, the edit distance will be divided by the length of
reference string N.
)DOC");
}
};
......
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