Method and apparatus for performing word segmentation on text, device, and medium

1. A method for performing word segmentation on a text, comprising:

dividing a to-be-segmented text into at least two layers of character fragment combinations, any layer of character fragments being child character fragments of a previous layer of character fragments and/or parent character fragments of a next layer of character fragments; and

segmenting the to-be-segmented text according to a target word granularity based on the at least two layers of character fragment combinations;

wherein the dividing the to-be-segmented text into at least two layers of character fragment combinations comprises:

extracting candidate character fragments of at least one kind of length from the previous layer of character fragments, the previous layer of character fragments belonging to a previous layer of character fragment combination;

combining the extracted candidate character fragments to obtain candidate character fragment combinations; and

determining a current layer of character fragment combination from the candidate character fragment combinations according to an overlapping relationship between the candidate character fragments and historical usage information of the candidate character fragments, the current layer of character fragment combination including at least one character fragment of the current layer.

2. The method according to claim 1 , wherein the determining the current layer of character fragment combination from the candidate character fragment combinations according to the overlapping relationship between the candidate character fragments and historical usage information of the candidate character fragments comprises:

filtering a candidate character fragment combination having an overlap from the candidate character fragment combinations, to obtain target character fragment combinations; and

determining the current layer of character fragment combination from the target character fragment combinations according to a number of candidate character fragments included in the target character fragment combinations and historical usage information of the candidate character fragments.

3. The method according to claim 2 , wherein the determining the current layer of character fragment combination from the target character fragment combinations according to the number of candidate character fragments included in the target character fragment combinations and historical usage information of the candidate character fragments comprises:

calculating an information entropy of the candidate character fragments according to historical adjacent character information of the candidate character fragments;

determining weights of the target character fragment combinations according to the calculated information entropy; and

determining the current layer of character fragment combination from the target character fragment combinations according to the number of the candidate character fragments included in the target character fragment combinations and the weights of the target character fragment combinations.

4. The method according to claim 1 , wherein the segmenting the to-be-segmented text according to the target word granularity based on the at least two layers of character fragment combinations comprises:

determining target segmentation fragments from character fragments of the character fragment combinations according to historical usage information of character fragments in the character fragment combinations and a parent-child relationship between character fragments in different character fragment combinations; and

combining the target segmentation fragments, and segmenting the to-be-segmented text according to the target word granularity based on the combination of target segmentation fragments.

5. The method according to claim 4 , wherein the determining target segmentation fragments from character fragments of the character fragment combinations according to historical usage information of character fragments in the character fragment combination and a parent-child relationship between character fragments in different character fragment combinations comprises:

determining, according to historical usage information of a parent character fragment in the character fragment combinations, a weight of the parent character fragment;

determining, according to historical usage information of a child character fragment associated with the parent character fragment, a comprehensive weight of the child character fragment; and

comparing the weight of the parent character fragment with the comprehensive weight of the child character fragment; and terminating a traversal for a branch to which the parent character fragment belongs and using the child character fragment associated with the parent character fragment as the target segmentation fragment, in response to the weight of the parent character fragment is greater than the comprehensive weight of the child character fragment.

6. The method according to claim 1 , wherein after segmenting the to-be-segmented text, the method further comprises:

comparing a target segmentation word obtained through the segmentation with an existing segmentation word, the existing segmentation word being obtained by segmenting the to-be-segmented text based on an existing word segmentation logic; and

determining a to-be-mined word from the target segmentation word according to a comparison result.

7. An electronic device, comprising:

at least one processor; and

a memory, communicatively connected with the at least one processor,

wherein the memory stores instructions executable by the at least one processor, and the instructions when executed by the at least one processor, cause the at least one processor to perform operations, the operations comprising:

dividing a to-be-segmented text into at least two layers of character fragment combinations, any layer of character fragments being child character fragments of a previous layer of character fragments and/or parent character fragments of a next layer of character fragments; and

segmenting the to-be-segmented text according to a target word granularity based on the at least two layers of character fragment combinations;

wherein the dividing the to-be-segmented text into at least two layers of character fragment combinations comprises:

extracting candidate character fragments of at least one kind of length from the previous layer of character fragments, the previous layer of character fragments belonging to a previous layer of character fragment combination;

combining the extracted candidate character fragments to obtain candidate character fragment combinations; and

determining a current layer of character fragment combination from the candidate character fragment combinations according to an overlapping relationship between the candidate character fragments and historical usage information of the candidate character fragments, the current layer of character fragment combination including at least one character fragment of the current layer.

8. The electronic device according to claim 7 , wherein the determining the current layer of character fragment combination from the candidate character fragment combinations according to the overlapping relationship between the candidate character fragments and historical usage information of the candidate character fragments comprises:

filtering a candidate character fragment combination having an overlap from the candidate character fragment combinations, to obtain target character fragment combinations; and

determining the current layer of character fragment combination from the target character fragment combinations according to a number of candidate character fragments included in the target character fragment combinations and historical usage information of the candidate character fragments.

9. The electronic device according to claim 8 , wherein the determining the current layer of character fragment combination from the target character fragment combinations according to the number of candidate character fragments included in the target character fragment combinations and historical usage information of the candidate character fragments comprises:

calculating an information entropy of the candidate character fragments according to historical adjacent character information of the candidate character fragments;

determining weights of the target character fragment combinations according to the calculated information entropy; and

determining the current layer of character fragment combination from the target character fragment combinations according to the number of the candidate character fragments included in the target character fragment combinations and the weights of the target character fragment combinations.

10. The electronic device according to claim 7 , wherein the segmenting the to-be-segmented text according to the target word granularity based on the at least two layers of character fragment combinations comprises:

determining target segmentation fragments from character fragments of the character fragment combinations according to historical usage information of character fragments in the character fragment combinations and a parent-child relationship between character fragments in different character fragment combinations; and

combining the target segmentation fragments, and segmenting the to-be-segmented text according to the target word granularity based on the combination of target segmentation fragments.

11. The electronic device according to claim 10 , wherein the determining target segmentation fragments from character fragments of the character fragment combinations according to historical usage information of character fragments in the character fragment combination and a parent-child relationship between character fragments in different character fragment combinations comprises:

determining, according to historical usage information of a parent character fragment in the character fragment combinations, a weight of the parent character fragment;

determining, according to historical usage information of a child character fragment associated with the parent character fragment, a comprehensive weight of the child character fragment; and

comparing the weight of the parent character fragment with the comprehensive weight of the child character fragment; and terminating a traversal for a branch to which the parent character fragment belongs and using the child character fragment associated with the parent character fragment as the target segmentation fragment, in response to the weight of the parent character fragment is greater than the comprehensive weight of the child character fragment.

12. The electronic device according to claim 7 , wherein after segmenting the to-be-segmented text, the operations further comprise:

comparing a target segmentation word obtained through the segmentation with an existing segmentation word, the existing segmentation word being obtained by segmenting the to-be-segmented text based on an existing word segmentation logic; and

determining a to-be-mined word from the target segmentation word according to a comparison result.

13. A non-transitory computer readable storage medium, storing computer instructions, wherein the computer instructions when executed by a computer, cause the computer to perform operations, the operations comprising:

dividing a to-be-segmented text into at least two layers of character fragment combinations, any layer of character fragments being child character fragments of a previous layer of character fragments and/or parent character fragments of a next layer of character fragments; and

segmenting the to-be-segmented text according to a target word granularity based on the at least two layers of character fragment combinations;

wherein the dividing the to-be-segmented text into at least two layers of character fragment combinations comprises:

extracting candidate character fragments of at least one kind of length from the previous layer of character fragments, the previous layer of character fragments belonging to a previous layer of character fragment combination;

combining the extracted candidate character fragments to obtain candidate character fragment combinations; and

determining a current layer of character fragment combination from the candidate character fragment combinations according to an overlapping relationship between the candidate character fragments and historical usage information of the candidate character fragments, the current layer of character fragment combination including at least one character fragment of the current layer.