Text classification¶
Model training requires a large amount of labeled data. Therefore, before the model training, add labels to the files that are not labeled. In addition, you can modify, delete, and re-label the labeled text.
Text classification classifies text content based on labels. Before labeling text content, pay attention to the following:
Text labeling supports multiple labels. That is, you can add multiple labels to a labeling object.
A label name can contain a maximum of 1,024 characters, including letters, digits, hyphens (-), underscores (_), and special characters.
Starting Labeling¶
Log in to the ModelArts management console. In the navigation pane on the left, choose Data Management > Label Data.
In the labeling job list, select a labeling type from the All type drop-down list, click the job to be performed based on the labeling type. The details page of the job is displayed.
The job details page displays all data of the labeling job.
Synchronizing New Data¶
ModelArts automatically synchronizes data and labeling information from datasets to the labeling job.
To quickly obtain the latest data in the datasets, in the Unlabeled tab of the labeling job details page, click Synchronize New Data.
Labeling Text Files¶
The labeling job details page displays the Unlabeled and Labeled tabs. The Unlabeled tab is displayed by default.
In the Unlabeled tab, the objects to be labeled are listed in the left pane. In the list, click the text object to be labeled, and select a label in the Label Set area in the right pane. Multiple labels can be added to a labeling object.
You can repeat this operation to select objects and add labels to the objects.
After all objects are labeled, click Save Current Page at the bottom of the page.
Adding a Label¶
Adding labels in the Unlabeled tab: Click the plus sign (+) next to Label Set. On the displayed Add Label page, add a label name, select a label color, and click OK.
Adding labels in the Labeled tab: Click the plus sign (+) next to Label Set. On the displayed Add Label page, add a label name, select a label color, and click OK.
Viewing the Labeled Text¶
On the labeling job details page, click the Labeled tab to view the list of labeled texts. You can also view all labels supported by the labeling job in the All Labels area on the right.
Modifying Labeled Data¶
After labeling data, you can modify labeled data in the Labeled tab.
Modifying based on texts
On the labeling job details page, click the Labeled tab and select the text to be modified from the text list.
In the text list, click the text. When the text background turns blue, the text is selected. If a text file has multiple labels, you can click
on the above to delete the label.Modifying based on labels
On the labeling job details page, click the Labeled tab. The information about all labels is displayed on the right.
Batch modification: In the All Labels area, click the edit icon in the Operation column, modify the label name in the text box, select a label color, and click OK.
Batch deletion: In the All Labels area, click the deletion icon in the Operation column to delete the label. In the displayed dialog box, select Delete the label or Delete the label and objects with only the label, and click OK.
Adding a File¶
In addition to the data synchronized, you can directly add data on labeling job details page for labeling.
On the labeling job details page, click the Unlabeled tab, click Add data in the upper left corner.
Configure the data source, import mode, and other parameters, and click OK.
For details about how to import data, see section "Importing Data".
Deleting a File¶
You can quickly delete the files you want to discard.
In the Unlabeled tab, select the text to be deleted, and click Delete in the upper left corner.
In the Labeled tab, select the text to be deleted, and click Delete. Alternatively, click Select Current Page to select all text objects on the current page and click Delete in the upper left corner.
The background of the selected text is blue.
Managing Annotators¶
If team labeling is enabled for a labeling job, view its labeling details in the Annotator Management tab. Additionally, you can add, modify, or delete annotators.
Choose Data Management > Label Data. In the My Creations or My Participations tab, view the list of all labeling jobs.
Locate the row that contains the target team labeling job. (The name of a team labeling job is followed by
.)Choose More > Annotator Management in the Operation column. Alternatively, click the job name to go to the job details page, and choose Team Labeling > Annotator Management in the upper right corner.
Adding an annotator
Click Add Member, select a member name, and click OK.
Click Send Email in the Operation column to send the labeling job to the annotator by email.
Modifying annotator information
Click Modify in the Operation column to modify the role of the annotator.
Deleting an annotator
Click Delete in the Operation column to delete the annotator.